CN1943122A - Receiving device, transmitting device, and radio system - Google Patents

Abstract

Disclosed are a transmitting device using a plurality of pulse signals with different pulse continuation times, a receiving device and a wireless system capable of stably demodulating only a burst of a desired wave. In the transmitting device, the control signal generation circuit outputs a control signal for generating a plurality of pulse signals having different pulse successive generation times, and the pulse generation circuit generates the plurality of pulse signals using the control signal. In the receiving device, the receiving end (104) receives a plurality of pulse signals with different continuous pulse generation times, and the delay circuit (101) delays at least one of the receiving end output signals (107a, 107b) output from the receiving end by a prescribed delay time, The delayed pulse synthesizing circuit (102) synthesizes the delayed signal (108) and the receiving end output signal (107b), and performs stable demodulation only on the pulse train of the desired wave.

Description

Receiver, sender and wireless system

technical field

The present invention relates to a receiving device, a transmitting device, and a wireless system mainly using pulse signals from the millimeter wave band to the micron wave band.

Background technique

In recent years, a communication system called Ultra Wide Band (UWB: Ultra Wide Band) communication using a very wide frequency band from several hundred MHz to several GHz and beyond, and a distance measuring system using an ultra wide band signal Research and development are carried out actively.

UWB communication is different from existing wireless communication in that it uses narrow pulses (hereinafter also referred to as short pulses) and spreads the frequency components to a very wide frequency band from several hundred MHz to several GHz, and further beyond that. communication. In addition, the distance measuring system using UWB communication calculates the distance by measuring the time difference between the transmitted short burst signal and the received short burst signal. In order to perform high-speed communication using ultra-wideband communication or to measure distance with high precision, it is necessary to perform extremely narrow pulse control of less than 1 nanosecond, but such control has been difficult in the prior art. However, with the advancement of semiconductor technology in recent years, such control has become technically possible. The advantage of ultra-wideband communication is that, for example, since short pulses are used, even if many users use signals of a common frequency band, there is little signal overlap per unit time, so it is easy to separate each communication, and communication can be performed in parallel at the same time. In addition, UWB communication has the advantage that it is less susceptible to interference by specific frequencies and radio wave interference as a whole because frequency components are spread over a very wide frequency band.

An example of a pulse generating circuit in a conventional transmission device is described in Japanese Patent Application Laid-Open No. 2003-513501. In addition, a conventional receiver can use, for example, a demodulation circuit described in US6452530 or a signal demodulation circuit having an effect of improving S/N described in JP-A-10-190356.

FIG. 14 shows a pulse generating circuit in a conventional transmitter described in Japanese Patent Application Publication No. 2003-513501.

In FIG. 14, the pulse generating circuit in the conventional transmitting device is composed of an analog waveform generating circuit 801 for generating an arbitrary analog waveform signal, an inductor 802, and a circuit 803 composed of a negative resistance element having a stable region and an unstable region. An analog waveform signal including transmission data is generated by an analog waveform generating circuit 801 and first input to an inductor 802 . The inductor 802 performs waveform conversion of the input analog waveform signal. Then, the analog waveform signal after the waveform conversion is input to a circuit 803 composed of a negative resistance element. The circuit 803 responds to the waveform-converted analog waveform signal so that its operating state changes between a stable region and an unstable region, and oscillates in the unstable region. The inductor 802 waveform-transforms the analog signal so that it oscillates in the unstable region of the circuit 803 . By oscillating in an unstable region, one pulse of an analog waveform signal is divided into multiple short pulses to obtain a transmission output signal.

FIG. 15 shows a pulse signal demodulation circuit of a conventional receiver described in US6452530.

In Fig. 15, the pulse signal demodulation circuit includes a receiving unit 901 which converts a pulse train signal received from an antenna 904 into an analog signal, a receiving pulse generating circuit 902 having different pulse generation references, and receiving pulse generating circuits 902 by arranging The pulse signal generated in 902 is used to generate the composite decision circuit 903 for receiving the data signal string. The pulse signal demodulation circuit converts the received pulse train signal into an analog signal through the receiving unit 901, and inputs the converted analog signal into the receiving pulse generating circuit 902 having multiple different pulse generating references. Combination determination circuit 903 arranges the pulse signals generated by each reception pulse generating circuit to generate a reception data signal string.

FIG. 16 shows a signal demodulation circuit of a conventional receiver described in JP-A-10-190356, which has an effect of improving S/N.

In Fig. 16, delay circuit 1001 is the circuit that produces the delay time of τf=nτc, τf represents the delay time τ (second) in the frequency f, τc represents the repetition period of the modulation frequency during FM modulation, represents n=0,1, 2.... By adapting the differential detection to the demodulation of the FM modulated wave, in the combining circuit 1002, the modulated signal which is a repetitive wave is additively combined, but the noise component which is an uncorrelated wave is not additively combined. Thereby, S/N is improved by increasing the ratio of the desired wave to the noise component.

In addition, although there is no particular example, in spectrum diffusion communication, it is known that if each user uses a different diffusion code, multiple user signals can be overlapped on the same frequency band (CDMA: Code Division Multiple Access). This CDMA is also used in mobile communications.

When the mobile station near the base station and the mobile station far away from the base station communicate with the base station at the same time, the radio wave from the mobile station near the base station has a small attenuation due to the short distance, and the signal arriving at the base station is a large signal. On the contrary, the wave from the mobile station far away from the base station Due to the long distance, the radio wave of the mobile station is greatly attenuated, and it reaches the base station as a small signal. At this time, since the base station adjusts the power level of the receiving system in accordance with the large signal from the nearby base station, a near-far problem arises that the small signal from the distant mobile station cannot be demodulated. As one of the methods for solving the near-far problem, there is known transmission power control that reduces the transmission power of mobile stations near the base station. In transmission power control, the mobile station controls transmission power based on control information from the base station. By this transmission power control, it is possible to reduce the signal power level difference between radio waves from a mobile station far from the base station and radio waves from a nearby mobile station, and adjust the power level of the receiving system so that both can be received and demodulated.

In the transmitting device and receiving device of the conventional structure described in Japanese Patent Application No. 2003-513501 and US6452530, if simultaneously receiving radio waves and For radio waves from other nearby wireless devices, due to the distance problem mentioned above, if the reception power level control is performed based on a signal with high power, it may not be possible to receive a signal with low demodulation power. In addition, signals may interfere with each other and mishandling of signals may occur.

In addition, since the S/N improvement technique in the conventional receiving device described in Japanese Unexamined Patent Publication No. 10-190356 utilizes the phenomenon that regular signals can be superimposed and irregular signals cannot be superimposed, separation of regular signals from a plurality of wireless devices may become difficult. Difficult to get. Also, the technique of transmission power control is an effective method in one-to-many communication, but when there are a plurality of radio links, it may be necessary to perform complicated radio control across the links. For example, when other wireless devices communicate with each other over a long distance, the transmission of the wireless device that performs long-distance communication with a large transmission power is reduced in accordance with the reception level of other short-distance communication wireless devices located nearby. Power can be difficult.

Furthermore, when the communication method of the wireless device is time division multiplexing, frequency division multiplexing, or code division multiplexing, the structure may become complicated, the size of the equipment may increase, and the cost may increase.

Contents of the invention

The present invention provides a transmitting device, a receiving device, and a wireless system that use a plurality of pulse signals with different pulse continuation times in a small size and at low cost. Only the pulse sequence of the desired wave is stably demodulated among the plurality of pulse signals, and the mass production rate is high.

The receiving device of the present invention includes a receiving end, a delay circuit and a delayed pulse synthesis circuit. The receiving end receives a plurality of pulse signals having different pulse successive generation times as received signals. The delay circuit generates a delayed signal by delaying at least one of the receiving-end output signals output from the receiving end by different predetermined delay times. The delayed pulse synthesizing circuit synthesizes one of the delayed signals and the other of the delayed signals or the output signal of the receiving end.

With this configuration, for example, a reception device that cancels a burst as an interference wave and can stably demodulate only a burst of a desired wave is realized at a small size and at low cost. In addition, since a plurality of filters having different frequency bands required in frequency division multiplexing communication or frequency-variable filters are not required, mass productivity is high. For example, in the case of the frequency division multiplexing method, in order to select a signal of an arbitrary frequency from the multiplexed signal at high speed, it is necessary to have a plurality of filters or receiving system branches with different frequency bands, or to have a plurality of frequency bands. In the present invention, special circuits such as frequency variable filters that change characteristics are not required, so mass production is high.

In addition, the transmitting device of the present invention includes a control signal generating circuit and a pulse generating circuit. The control signal generating circuit outputs a control signal for generating a plurality of pulse signals having different pulse successive generation times. With this configuration, it is possible to realize a transmitting device using a plurality of pulse signals having different pulse successive generation times, such that a plurality of receiving devices can transmit simultaneously.

Description of drawings

Fig. 1A is a block diagram showing the configuration of a receiving apparatus in the first embodiment of the present invention.

Fig. 1B shows synthesis of pulse signals in the receiving apparatus in the first embodiment of the present invention.

Fig. 2A is a block diagram showing the configuration of a pulse generating circuit of the transmitting device in the first embodiment of the present invention.

FIG. 2B shows switching of the pulse generation time of the pulse generation circuit of the transmission device according to the first embodiment of the present invention.

Fig. 3A is a block diagram showing the configuration of a receiving apparatus in a second embodiment of the present invention.

Fig. 3B shows synthesis of pulse signals in the receiving apparatus in the second embodiment of the present invention.

Fig. 4A is a block diagram showing the configuration of a receiving apparatus in a second embodiment of the present invention.

Fig. 4B shows the frequency characteristics of the distribution circuit of the receiving apparatus in the second embodiment of the present invention.

Fig. 4C shows a branch line coupler constituting the receiving apparatus in the second embodiment of the present invention.

Fig. 5 is a block diagram showing the structure of a receiving apparatus in a second embodiment of the present invention.

FIG. 6 shows the state of delay and combination of received signals in the receiving apparatus according to the second embodiment of the present invention.

Fig. 7 shows synthesis of pulse signals in the receiving apparatus in the second embodiment of the present invention.

Fig. 8 shows the configuration of a wireless system in a third embodiment of the present invention.

Fig. 9A is a flowchart showing the operation of the wireless system in the third embodiment of the present invention.

Fig. 9B is a block diagram showing the configuration of a wireless device composed of a receiving device and a transmitting device in the third embodiment of the present invention.

Fig. 10 shows the signal state of the wireless device in the third embodiment of the present invention.

FIG. 11 shows reception signals of an audio player as a wireless device in a third embodiment of the present invention.

Fig. 12 shows signals in an audio player as a wireless device in a third embodiment of the present invention.

Fig. 13 shows a ranging system constituted by wireless devices in a fourth embodiment of the present invention.

Fig. 14 is a block diagram showing the configuration of a pulse generating circuit of a conventional transmitter.

Fig. 15 is a block diagram showing the configuration of a conventional receiving device.

Fig. 16 is a block diagram showing the configuration of a signal demodulation circuit of a conventional receiver.

Explanation of symbols: 11, 1501-short pulse signal; 12, 1503-long pulse signal; 101, 1103-delay circuit; 102, 1104, 1604a, 1604b-delay pulse synthesis circuit; 103-receiving variable gain amplifier; 107, 306, 501, 1607a, 1607b, 1607c, 1607d-receiving terminal output signal; 108, 307, 502, 1608a, 1608b-delay signal; 109, 308, 503-synthetic output signal; 201-switching signal generating circuit; 202-control Signal generating circuit; 203-waveform conversion circuit; 204-oscillating circuit; 301-first antenna; 302-second antenna; 303, 1105, 1605-receiving demodulation unit; 1102, 1602-distribution circuit; 403-delay pulse synthesis circuit 102 side distribution circuit 402 through loss; 404-delay circuit 101 side distribution circuit 402 through loss; 405-branch line coupler (branch line coupler); 406 -terminal resistor; 407-capacitor; 408-variable capacitance capacitor; 409-element; 410～417-terminal; 601-local server (home sever); 602-TV; 603-audio player; 604-wall; 605 -PC; 701, 702, 703-moving body; 704-wide and short ranging area; 705-narrow and long ranging area; 1106-pulse continuous time setting circuit; 1107-pulse generating circuit; 1201-from TV Signal; 1202-signal from audio player; 1301, 1303, 1305-hope wave; 1302, 1304, 1306-interference wave; 1401-signal from local server; 1402-signal from PC; 1502-slightly longer pulse Signal; 1603a - first delay circuit; 1603b - second delay circuit.

Detailed ways

Embodiments of the present invention will be described below using the drawings.

(first embodiment)

Fig. 1A is a block diagram showing the configuration of a receiving apparatus in the first embodiment of the present invention.

The receiving device shown in FIG. 1A includes a receiving end 104 , a delay circuit 101 , a delayed pulse synthesis circuit 102 , and a receiving variable gain amplifier 103 . The receiving end 104 receives a plurality of pulse signals having different pulse successive generation times as received signals. The delay circuit 101 delays the receiver output signal 107 a output from the receiver 104 to output a delayed signal 108 . Delayed pulse synthesizing circuit 102 synthesizes receiving end output signal 107 b output from receiving end 104 and delayed signal 108 . The receive variable gain amplifier 103 amplifies the output of the delay pulse synthesizing circuit 102 .

The operation of the reception device configured as described above will be described. The receiver 104 outputs a receiver output signal 107 a to the delay circuit 101 and also outputs a receiver output signal 107 b to the delayed pulse synthesis circuit 102 after receiving a received signal composed of a plurality of pulse signals. The delay time of the delay circuit 101 is τ (seconds). The delay circuit 101 outputs a delayed signal 108 after receiving an output signal 107 a from the receiving end. The delayed pulse synthesis circuit 102 synthesizes the delayed signal 108 and the receiving end output signal 107 b, and outputs a synthesized output signal 109 . The combined output signal 109 is amplified by the receive variable gain amplifier 103 .

FIG. 1B is a diagram showing the synthesis of the output signal of the receiving end and the delayed signal in this embodiment, in the case where the short pulse signal 11 is a desired signal and the long pulse signal 12 is an interference signal. The short pulse signal 11 and the long pulse signal 12 are mixed together in the received signal. In the received signal itself, since the long pulse signal 12 as the interference signal has a long pulse duration, the cumulative power is large, and the receiving variable gain amplifier 103 is saturated by the interference signal, or gain control is performed by adding the power of the interference signal, thereby The short pulse signal 11 that cannot be demodulated into a desired signal. In addition, since the receiving device also synchronizes and demodulates the long pulse signal 12, it may cause an increase in signal processing time or signal error processing in the receiving device.

In order to solve the above problems, the receiving device of this embodiment generates a delayed signal 108 with a delay time through the delay circuit 101 . Specifically, the receiving end 104 receives the received signal, and outputs the receiving end output signal 107b and the receiving end output signal 107a. The delay circuit 101 outputs a delayed signal 108 obtained by delaying the receiving end output signal 107a by a delay time τ. The delay signal 108 output from the delay circuit 101 is delayed by a delay time τ from the receiving end output signal 107 b output from the receiving end 104 .

The delay circuit 101 sets the delay time τ longer than the time occupied by the short pulse signal 11 . Accordingly, in the combined output signal 109 from the delayed pulse combining circuit 102, there are two pulses for the short pulse signal (11c in FIG. 1B), and the long pulse signal is partially canceled (12c in FIG. 1B). Since the amplitude of the pulse train in the long pulse signal after cancellation becomes smaller, the integrated power of the long pulse signal 12c is significantly smaller than the integrated power of the long pulse signal 12a. Therefore, the receiving variable gain amplifier 103 can perform an operation in accordance with a desired signal, and can demodulate a short pulse signal.

In addition, if the delay time τ is, for example, an odd multiple of the half period of the long pulse signal 12a, the delayed pulse synthesis circuit 102 can synthesize the pulse train of the interference wave with a phase difference of 180 degrees, so the long pulse in the synthesized output signal 109 The signal 12c is maximally cancelled, and the reduction of the integrated power can be further increased. Also, even if the delay time τ is, for example, n-(2/3) cycle to n-(1/3) cycle (n: natural number) of the long pulse signal 12a, the signal can be canceled and the integrated power can be reduced.

As described above, the receiving apparatus of this embodiment can cancel the pulse signal as the interference signal with a simple structure, and can stably demodulate only the pulse signal of the desired signal. Compared with the existing receiving device, which needs to perform time division multiplexing, frequency division multiplexing or code division multiplexing, which leads to equipment enlargement and high price, the receiving device of this embodiment does not need to perform time division multiplexing, etc., so The equipment will not be enlarged and the price is not expensive, so that the mass production rate is high.

In the above-mentioned embodiment, it has been described that the received signal is a signal with a long pulse duration and a short signal, but the output signal of the receiving end of the present invention from the receiving end 104 includes, for example, a short pulse signal, a medium-length pulse signal and a long pulse signal. In the case of three or more pulse signals such as pulse signals, the same effect can also be achieved by setting delay circuits with different delay times for the output signals of each receiving end. Specifically, for example, in the case where three receiving-end output signals from the receiving end are output, 1 to 3 delay circuits may be set.

In the above embodiments, the influence of the interference signal on the receiving amplifier has been described, but the interference signal also has the same influence on the receiving mixer and the receiving IF amplifier, etc., so the structure of this embodiment also reduces the impact on these The effect of demodulating the desired signal can be stabilized.

Fig. 2A is a block diagram showing the configuration of a pulse generating circuit of the transmitting device in the first embodiment of the present invention. In FIG. 2A , the transmitting device of this embodiment includes a switching signal generation circuit 201 , a control signal generation circuit 202 , a waveform conversion circuit 203 and an oscillation circuit 204 . The switching signal generating circuit 201 generates a switching signal. The control signal generating circuit 202 generates a control signal based on the switching signal from the switching signal generating circuit 201 . The waveform conversion circuit 203 converts the waveform by the control signal generated by the control signal generation circuit 202 . The oscillation circuit 204 oscillates pulses according to the pulse generation control signal from the waveform conversion circuit 203 .

The operation of the pulse generating circuit of the transmitter configured as above will be described using FIG. 2A. The switching signal generating circuit 201 switches output, for example, a switching signal in which only one pulse is generated as a pulse generation time short pulse signal and a switching in which several tens of pulses are continuously generated in the case of a sink function of one cycle as one pulse. The signal comes as a pulse signal with a long pulse generation time. Specifically, when "0" is output as a switching signal from the switching signal generating circuit 201, the control signal generating circuit 202 generates a control signal that outputs a pulse signal for only a period of 0.1 ns, for example.

When "1" is output as a switching signal from the switching signal generating circuit 201, the control signal generating circuit 202 generates a control signal for outputting a pulse signal only for a period of 1 ns, for example. In addition, the generation time of the control signal in the present invention is not limited to 0.1 ns and 1 ns here. The control signal generation circuit 202 outputs a control signal corresponding to the generation time of each pulse to the waveform conversion circuit 203 according to the switching signal of the switching signal generation circuit 201 . The waveform conversion circuit 203 converts the control signal into a pulse generation control signal suitable for the operation of the oscillation circuit 204 .

The waveform conversion circuit 203 is constituted by a coil, a resistor, an operational amplifier, or an IC including these elements. The waveform conversion circuit 203 adjusts the rising edge characteristic and falling edge characteristic of the control signal through the inductance value of the coil, and uses a plurality of resistors and operational amplifiers to adjust the amplitude and DC bias value of the control signal. The pulse generation control signal generated by the waveform conversion circuit 203 is, for example, a voltage applied to a power supply terminal of the oscillation circuit 204 , and a pulse signal is generated from the oscillation circuit 204 by controlling the oscillation and stop times of the oscillation circuit 204 .

In the present embodiment, the oscillation circuit 204 is used as the pulse generating circuit, but the pulse generating circuit is not limited to this as long as the pulse generating circuit generates a pulse signal. The circuit configuration of the oscillation circuit 204 is also not limited to the configuration of this embodiment. The switching of the pulse generation time may be a method of generating either a pulse signal with a short pulse generation time or a pulse signal with a long pulse generation time a predetermined number of times at regular intervals. Thus, a pulse signal with a short pulse generation time or a pulse signal with a long pulse generation time can be generated.

2B is a diagram showing switching of pulse generation timings in the oscillation circuit 204 in response to a control signal from the switching signal generating circuit 201 of the pulse generating circuit of the transmitting device in the first embodiment of the present invention. The present invention can also be performed by mixing two signals, a pulse signal with a short pulse generation time and a pulse signal with a long pulse generation time, on average at a predetermined number of times during a certain period of time.

In addition, the present embodiment describes two cases where the pulse generation time is 0.1 ns and 1 ns, but the present invention is not limited thereto, and the same effect can be achieved in the case of other combinations of pulse signal generation times. The switching signal generation circuit 201 can set the number of pulses to be generated for each of the long pulse signal and the short pulse signal by setting the number of pulses corresponding to the pulse generation time. For example, when the switching signal output "0" as the switching signal generating circuit 201 is output by the control signal generating circuit 202, it is set to 0.5 ns, and when "1" is output, it is set to 1.5 ns, so that the transmitting device of the present invention can be freely adjusted. The number of pulse occurrences corresponding to the pulse occurrence time.

In the present invention, even when the number of pulses to be generated is three or more, the same effect can be achieved. Specifically, the command of each switching signal generated by the switching signal generating circuit 201 is represented by a table (not shown in the figure), and the switching signal generating circuit 201 stores the above table in advance. For example, in the case of a transmission signal composed of pulse signals having three pulse generation times, when the control signal generating circuit 202 outputs "01" as the switching signal of the switching signal generating circuit 201, pulses corresponding to a time of 0.5 ns are sequentially generated. The number of pulse signals, when the switching signal is output "10", the number of pulse signals corresponding to the time of 1ns will be generated sequentially, and when the switching signal is output "11", the number of pulse signals corresponding to the time of 2ns will be generated sequentially, as the switching signal When "00" is output, no pulse signal will be generated. In this way, the number of pulse generation corresponding to the pulse generation time can be freely set, and a transmission signal composed of pulse signals having three kinds of pulse generation times is generated.

In addition, since the command of each switching signal is represented by a table, it is also possible to similarly generate a transmission signal composed of pulse signals having four or more types of pulse generation times. In addition, the present invention is not limited to the pulse generation times of 0.5 ns, 1 ns, and 2 ns shown in this embodiment.

(second embodiment)

Fig. 3A is a block diagram showing the configuration of a receiving apparatus in a second embodiment of the present invention.

This embodiment differs from the first embodiment in that the receiving end is constituted by two antennas.

The receiving device in FIG. 3A has a first antenna 301 for receiving a received signal, a second antenna 302, and a reception demodulation unit 303 for performing reception demodulation. This embodiment utilizes the property of a pulse signal that a short pulse signal is wide in a wide frequency band, and a long pulse signal is wide only in a narrow frequency band. The second antenna 302 is an antenna that only receives narrowband signals, and only receives long pulse signals among the received signals. The first antenna 301 is an antenna for receiving broadband signals, and receives both the long pulse signal and the short pulse signal in the received signal.

Fig. 3B is a diagram showing synthesis of pulse signals in the second embodiment of the present invention. This embodiment is the same as the first embodiment, and the receiving end output signal 306 and the delayed signal 307 are synthesized by the delay pulse synthesis circuit 102 . The synthesized output signal 308 of the delayed pulse synthesis circuit 102 generates a pulse for the short pulse signal, which partially cancels out the long pulse signal, which can greatly reduce the accumulated power. Accordingly, the reception demodulation unit 303 can demodulate the short pulse signal without saturating the input signal. The receiving device of the present invention can cancel long pulse signals which are interference signals with a simple structure, and can stably demodulate only short pulse signals of desired signals, so that mass productivity is also high.

In addition, the present embodiment relates to a reception signal composed of two kinds of pulse signals, a short pulse signal and a long pulse signal, but the same effect can be achieved also in the case of a reception signal composed of multiple kinds of pulse signals.

In addition, the above-mentioned embodiment uses a plurality of antennas, but as shown in FIG. 4A , it can also be configured with a single antenna using an antenna 401 having a wide frequency band and a distribution circuit 402 having a uniform distribution characteristic in a narrow frequency band. Fig. 4A is a block diagram showing the configuration of a receiving apparatus in a second embodiment of the present invention. The antenna 401 is an antenna capable of receiving a pulse signal over a wide frequency band, and receives a reception signal composed of both a long pulse signal and a short pulse signal. The distribution circuit 402 distributes only pulse signals of a predetermined frequency band. Since the range of the allocatable frequency band is narrower, the length of the pulse signal that can be distributed increases, so only long pulse signals are distributed to the delay circuit 101 .

The long pulse signal input from the distribution circuit 402 to the delay circuit 101 is delayed by time τ. The delayed pulse synthesis circuit 102 synthesizes the long pulse signal delayed by the delay circuit 101 and the signal received by the antenna 401 and passed through the distribution circuit 402 in the same manner as other embodiments. At this time, since the short pulse signal is not canceled in the reception signal received by the antenna 401 in the delayed pulse synthesis circuit 102, but the long pulse signal is partially canceled, the integrated power can be greatly reduced.

FIG. 4B is a diagram showing frequency characteristics of distribution circuit 402 of the receiving apparatus in the second embodiment of the present invention. FIG. 4B shows that the higher the pass loss on the vertical axis is, the smaller the pass loss is, indicating that the predetermined frequency band is equally divided by the pass allocation circuit 402 .

In FIG. 4B , while the pass loss 403 in the output of the delay circuit 102 side of the distribution circuit 402 is substantially constant, the pass loss 404 in the output of the delay circuit 101 side of the distribution circuit 402 varies according to the frequency band of the pulse signal. In the case of a predetermined frequency band, since both have the same pass loss, the long pulse signal corresponding to the predetermined frequency band is equally divided and input to the delay circuit 101 . In the case outside the predetermined frequency band, the pulse signal is not equally divided and is not input to the delay circuit 101 because the pass loss of the two is different.

FIG. 4C is a configuration diagram in a case where a branch line coupler 405 is used as the distribution circuit 402 and the delay circuit 101 of the receiving device in the second embodiment of the present invention.

In FIG. 4C , the branch line coupler 405 includes a terminal resistor 406 , a capacitor 407 , a variable capacitance capacitor 408 , an element 409 constituting the branch line coupler 405 , and terminals 410 to 417 . The branch line coupler 405 constitutes four lines whose center frequency in a predetermined frequency band is 1/4 wavelength, that is, whose phase amount is 90 degrees, in a chain form. When the phase amount of the line is 90 degrees at the center frequency, the circuit is in a state of complete matching and a state of complete separation.

That is, when the pulse signal received by the antenna 401 has a predetermined center frequency, the branch line coupler 405 functions as the distribution circuit 402 . In addition, the pulse signal from the antenna 401 is delayed by 90 degrees at the terminal 412 and output after being delayed by 90×2 degrees at the terminal 413 . Since the output of the terminal 413 is delayed by 90 degrees with respect to the output of the terminal 412 , the branch line coupler 405 functions as the delay circuit 101 . In addition, no pulse signal is transmitted due to isolation between the terminal 412 and the terminal 413 .

Further, the branch line coupler 405 also has the characteristics of a delayed pulse synthesis circuit due to the principle of the distribution characteristic of the branch line coupler 405 . In addition, since the terminal 414 and the terminal 415 are isolated, no burst signal is transmitted.

The present invention relates to wireless devices in ultra-wideband (UWB) communication systems, so characteristics of distributed constant circuits need to be considered in the high-frequency region. At this time, the termination resistor 406 is used to achieve impedance matching. In addition, since the capacitor 407 and the variable capacitance capacitor 408 advance the phase of the pulse signal, the phase of the pulse signal can be delayed by 90 degrees in a line shorter than 1/4 wavelength of the center frequency. Thus, the capacitor 407 operates to realize miniaturization and narrower bandwidth of the branch line coupler 405 , and the variable capacitance capacitor 408 functions as a delay circuit.

The coupler of the present invention is not limited to the branch line coupler, and the ring waveguide and parallel coupling line type couplers also have frequency characteristics, and can achieve the same effect as the branch line coupler. In addition, the present invention does not limit the number of allocations to 2 allocations, and it can be implemented in the same way even if it is 3 or more allocations.

5 is a block diagram showing the structure of a receiving device according to a second embodiment of the present invention, in which there are three types of pulse signals included in a received signal, the number of allocation circuits is four, and the number of delay circuits is two. The receiving device in FIG. 5 has a distribution circuit 1602 , a first delay circuit 1603 a , a second delay circuit 1603 b , delayed pulse synthesis circuits 1604 a , b and a reception demodulation unit 1605 . Distribution circuit 1602 outputs reception-side output signals 1607a to 1607a through reception signals received from antenna 1601 . The receiving end output signals 1607a and 1607c are input to the delayed pulse synthesizing circuits 1604a, b without special delay. The output signals 1607b and 1607d at the receiving end are respectively provided with different delays in the first delay circuit 1603a and the second delay circuit 1603b, and then input to the delayed pulse synthesis circuits 1604a and b as delayed signals 1608a and 1608b. The outputs of the delayed pulse synthesizing circuits 1604a and b are simultaneously input to the reception demodulation unit 1605, and demodulated as reception data.

Next, the operation of delaying and combining received signals in the receiving apparatus of this embodiment will be described using FIG. 6 .

The receiving end output signals 1607a-d include short pulse signal 1501 , slightly longer pulse signal 1502 and long pulse signal 1503 with different pulse widths. Hereinafter, an example in which the short pulse signal 1501 or the slightly longer pulse signal 1502 is taken out as a desired wave will be sequentially shown. When the short pulse signal 1501 is taken out as the desired wave, the first delay circuit 1603a applies a delay time of 1 to the receiver output signal 1607b, and outputs a delayed signal 1608a. Delayed pulse synthesis circuit 1604a synthesizes the signal 1608a and the output signal 1607a at the receiving end to attenuate the power of the slightly longer pulse signal 1502 and the long pulse 1503 which are interference waves until they are equal to the desired wave. The reception demodulation unit 1605 can demodulate the short pulse signal 1501 which is the desired wave.

Similarly, when the slightly longer pulse signal 1502 is taken out as the desired wave, the second delay circuit 1603b applies a delay time of 2 to the receiver output signal 1607d to output a delayed signal 1608b. Delayed pulse synthesis circuit 1604b can attenuate the short pulse signal 1501 as interference wave and the power of long pulse signal 1503 by synthesizing the delayed signal 1608b and the receiving end output signal 1607c until they are equal to the desired wave. The reception demodulator 1605 can demodulate the slightly longer pulse signal 1502 which is the desired wave. In addition, the same is true when the long pulse signal 1503 is taken out as a desired wave.

Further, the first embodiment and the second embodiment have described the case where the short pulse signal is the desired signal, but it can also act as increasing the redundancy of the demodulation process when the long pulse signal is the desired signal. Fig. 7 is a diagram showing synthesis of pulse signals in a receiving device according to a second embodiment of the present invention. FIG. 7 shows a receiver output signal 501 based on the received signal of the first antenna, a delayed signal 502 and a combined output signal 503 based on the received signal of the second antenna. As demodulation processing in this embodiment, as shown in the composite output signal 503 in FIG. 7 , demodulation processing may be performed twice on the long pulse signal which is the same signal in the first time zone and the third time zone. The second time zone as the delay time can be controlled arbitrarily, for example, it is also possible to perform synchronization processing in the first time zone and demodulate the signal in the third time zone.

(third embodiment)

Fig. 8 is a configuration diagram showing a wireless system according to a third embodiment of the present invention.

In Fig. 8, three local servers 601, TV 602 and audio player 603 as wireless devices are located in one room, and the distance is several meters. In this case, by using a short pulse signal for mutual communication, the signal is widened in a wide frequency band, and the frequency component per unit frequency is made very small, enabling communication without affecting other narrow-band communication systems. At this time, as the communication between the wireless device of the transmitting device and the receiving device of the present invention, for example, the communication between the local server 601 and the TV 602 and the communication between the local server 601 and the audio player 603 use time division and frequency division, etc., to be separated so that they do not cause malfunctions to the communication from each other.

Fig. 9A is a flowchart of communication start of the wireless system in the third embodiment of the present invention. Assume that the audio player 603 and the communicating local server 601 further start communicating with the TV 602 . Every time the local server 601 starts communication, it sets, for example, the shortest pulse continuous generation time (S701), and performs authentication and communication power adjustment at the start of communication. Here, the presence or absence of a return message from TV 602 is judged for the communication start request, or whether it is a communication state in which the S/N of the return signal is low. When it is determined that the power is insufficient ("Insufficient" in S702), the continuous pulse generation time is increased until the power reaches an appropriate value (S703).

Next, it is judged whether there is an interference wave (S704), and if there is no interference wave, the communication between the local server 601 and the TV 602 is established. If there is an interference wave ("YES" in S704), for example, on the TV 602 side that starts communication later, the pulse generation time is appropriately changed (S705) and adjusted so as not to overlap with the signal of the audio player 603 (S706).

FIG. 9B is a block diagram of a wireless device composed of a receiving device and a transmitting device according to a third embodiment of the present invention. The wireless device of this embodiment receives a signal through the antenna 1101a, and performs delayed combination processing on the signal through the distribution circuit 1102, the delay circuit 1103 and the delayed pulse combination circuit 1104. The reception demodulation unit 1105 demodulates the output signal from the delayed pulse synthesis circuit 1104, and performs communication state judgment and the presence or absence of interference waves, that is, coexistence state detection. Based on this information, the pulse continuation time setting circuit 1106 sets the pulse continuation time. The pulse generation circuit 1107 generates a pulse based on the output of the pulse duration setting circuit 1106, and transmits the pulse through the antenna 1101b.

Fig. 10 is a diagram showing states of signals in the third embodiment of the present invention. In FIG. 10 , in the initial state, a signal 1201 from the TV 602 and a signal 1202 from the audio player 603 are superimposed on the signal received by the local server 601 . They can be separated by the difference of the respective code strings, but a decrease in communication speed due to redundant information occurs. Therefore, by changing the transmission time of the signal 1201 from the TV 602 so that there is no signal overlap, the signal 1201 from the TV 602 and the signal 1202 from the audio player 603 can be separated only by the difference in timing of signal acquisition at the time of demodulation, and Reduce redundant information to improve communication speed.

In addition, in the above description, an example of setting the shortest continuous pulse generation time at the start of communication is shown, but it is also possible to adjust the pulse generation by using the time in the previous round of communication as a reference and stretching the time. Time, so that an appropriate time can be set in a shorter time. In addition, although an example is shown in which only the continuous pulse generation time is adjusted, it is also possible to adjust the communication power to an appropriate value by increasing or decreasing the signal amplitude accordingly.

Next, a case will be described in which, for example, in an adjacent room, the PC 605 which is the wireless device according to the present embodiment is started to be used and wireless signal communication with the local server 601 is started. Since the communication distance between the local server 601 and the PC 605 is long, there is a wall 604 in the path, so it is necessary to communicate with a signal with a higher power, and communication with a higher transmission power is required.

FIG. 11 is a diagram showing reception signals of the audio player 603 as the wireless device in the third embodiment of the present invention. As shown in received signal 1307 in FIG. 11 , in a conventional wireless system using continuous waves, PC 605 transmits a higher-power signal to audio player 603 at a closer distance than local server 601 as a communication partner. Therefore, the audio player 603 receives the interference wave 1302 having a larger amplitude than the desired wave 1301 . There is a problem that the amplifier and mixer of the receiving system are distorted by interference waves, for example, the communication between the local server 601 and the audio player 603 is disturbed.

Also, as shown in the received signal 1308 in FIG. 11 , if the power difference between the desired wave 1303 and the interference wave 1304 is small, reception demodulation can be performed by changing the pulse position as in the previous example. However, as shown in the received signal 1309 in FIG. 11, when the difference in the received power of the desired wave 1305 and the interference wave 1306, that is, the difference in the number of sine waves in FIG. 11 is large, even if the pulses do not overlap in time, for example, Also, desired gain and conversion characteristics could not be obtained. This is because if the amplifier and mixer of the receiving system operate only when the desired wave is input, distortion will occur even when the desired wave 1305 is input due to excessive response when the interference wave 1306 is input.

Therefore, the wireless system of the present embodiment can be used as the local server 601 for short-distance communication and the audio Short burst signals are used for communication between the players 603 . On the other hand, a long burst signal is used in communication between the local server 601 and the PC 605 as long-distance communication, and the audio player 603 cancels the long burst signal from the PC 605 . Thus, since the audio player 603 suppresses the received power of radio waves used in long-distance communication, radio waves used in long-distance communication do not interfere, and radio waves used in short-distance communication can be used to to communicate.

FIG. 12 is a diagram showing signals in audio player 603 as a wireless device in the third embodiment of the present invention. In FIG. 12, the received signals of the audio player 603 are a signal 1401 from the local server 601 as a desired wave and a signal 1402 from the PC 605 as an interference wave. In this state, as described above, since one of the interference waves is a high-power signal, it is difficult to demodulate the desired wave 1401 after adjusting it to an appropriate signal power. Therefore, a composite output signal is generated by generating a delayed signal with an appropriate delay time and combining it with the receiver output signal. In the synthesized output signal, the powers of the desired wave and the interference wave are approximately equal, and the power ratio to the interference wave signal can be greatly improved. For example, in this example, the power ratio of the desired wave to the interference wave in the received signal is 1:6, and the power ratio in the combined output signal is improved to 2:3.

In addition, long-distance communication using a signal with a long continuous pulse generation time is communication using a narrow-band signal, and by performing communication in a different frequency band from other narrow-band communication systems, the effect of frequency division communication is also facilitated. In addition, signals from other narrowband communication systems become interference signals, and when a failure occurs in communication between wireless devices in this embodiment, the frequency components are concentrated in the narrowband by lengthening the pulse signal, Can be made less susceptible to interference from other systems. That is, by narrowing the used frequency band, it is possible to prevent the frequency band from overlapping with other wireless devices.

In addition, it is also possible to switch transmission power by variable-length bursts to perform communication with a large communication capacity by multilevel modulation requiring a larger C/N ratio. Also, by making the oscillation circuits described in the first and second embodiments variable in frequency, it is possible to change the frequency band used for communication and establish a frequency division multiplexed wireless system. In addition, the frequency-variable oscillation circuit is not particularly limited, and a known circuit such as a voltage-controlled oscillator using a varactor diode may be used.

Further, it is possible to perform a combination in which the oscillation frequency is greatly changed, such as, for example, that the short burst communication is in the 60 GHz band and the long burst communication is in the 20 GHz band. A method of greatly changing the oscillation frequency can be implemented by using, for example, a high-order oscillation frequency of the oscillation frequency, transitioning a plurality of oscillation states, and switching to use a plurality of oscillators.

In the above wireless system, by using one of the wireless devices described in the first embodiment and the second embodiment, it is possible to switch or combine a communication device with a communication distance, a communication area, and a communication speed at a low cost with a simple structure. wireless system.

(fourth embodiment)

13 is a configuration diagram showing a distance measuring system using a wireless device as a receiving device and a transmitting device in a fourth embodiment of the present invention.

In FIG. 13 , a mobile body 701 is mounted with a wireless device, and a mobile body 702 and a mobile body 703 exist nearby. For example, when the mobile body 701 is moving, in order to avoid collisions with the mobile body 702 or the mobile body 703, or to perform tracking actions such as tracking a moving body moving ahead at a certain interval, it is necessary to measure the distance between each other. distance.

For example, by using a short pulse signal to measure the time until the pulse signal transmitted from the wireless device of the mobile 701 is reflected by the mobile 702 and received by the mobile 701 again, the distance can be calculated from the flight time.

In addition, by using a long pulse signal and applying appropriate frequency modulation to the transmitted pulse signal, the difference between the pulse signal transmitted from the wireless device of the mobile body 701 and the reflected signal reflected on the mobile body 703 and received by the mobile body 701 again can be obtained. The difference frequency is used to calculate the distance to the moving body 703.

Generally, ranging using a short pulse signal is pulse ranging, and ranging using a long pulse signal is FM-CW ranging. By using the wireless device in the first embodiment or the second embodiment of the present invention, the length of the pulse signal can be changed arbitrarily, and a ranging system that switches or combines pulse ranging and FM-CW ranging can be realized.

In addition, as a switching method between pulse ranging and FM-CW ranging, for example, in FIG. 13 , it is shown that the ranging accuracy of the mobile object 702 located in the vicinity is high, and in the wide and short ranging area 704, in this example, the Distance detection is performed in the pulse ranging with a wide directional angle on the horizontal plane, and the transmission power can be increased for the moving object 703 at a far position without affecting other systems. The long ranging area 705 is a structure for performing distance detection.

In addition, in the distance measuring system using the usual pulse, since the transmission pulse and the reflection pulse from the distance measurement object are separated, the next transmission pulse cannot be transmitted until the reflection pulse is received, but the same as the communication system in the third embodiment Similarly, since the short pulse signal and the long pulse signal do not interfere, the long pulse signal can be transmitted continuously regardless of the reception of the reflected pulse from the measuring object of the short pulse signal, and pulse distance measurement and FM-CW distance measurement can be continuously performed.

In addition, in the case of an object moving at a high speed in a distant place as an object in the usual pulse ranging, there is a problem of poor ranging accuracy due to the high-speed movement of the object during the time-of-flight of the reflected pulse. The transmitted pulse signal changes the number of pulses, and even if the pulse train is continuously generated without waiting for the reflected pulse, the transmitted signal and reflected signal can be separated, so distance measurement can be performed in a short period of time, and high-speed measurement can also be realized for high-speed moving objects distance accuracy.

In addition, in the usual pulse distance measurement, distance measurement is difficult because the transmission signal and the reflection signal cannot be separated for very close objects, but the present invention changes the number of pulses for each transmission pulse signal, and measures the difference between the distance and the distance. The delay time of the signal with the number of pulses becomes delay time=flight time+(time when the signal with the second number of pulses is received-time when the signal with the first number of pulses is transmitted), and the distance can be calculated from the time of flight.

Furthermore, as in the third embodiment, by making the frequency of the oscillation circuit variable, the frequency band used for distance measurement can be changed, and it can be used in a frequency division multiplexing distance measurement system that avoids interference with other systems.

In the wireless system of the present invention, by using the wireless device described in either of the first embodiment and the second embodiment, switching can be realized at low cost with a simple structure or a combination of measuring devices with different distances and distances can be achieved. measurement system.

Industrial Availability

According to the receiving device, transmitting device, and wireless system of the present invention, there is an effect that a transmitting device and a wireless system corresponding to a receiving device with high mass productivity can be realized at a small size and at low cost, and the receiving device can perform a pulse train as an interference wave. It can cancel and stably demodulate only the pulse train of the desired wave, and is useful as a receiving device, a transmitting device, a wireless system, and the like that mainly use pulse signals in the micron-wave range to the millimeter-wave range.

Claims (24)

1. A receiving device comprising: A receiving end, which receives a plurality of pulse signals with different pulse continuous generation times as a receiving signal; a delay circuit, which delays differently by making at least one of the receiving end output signals output from the receiving end output from the receiving end. a predetermined delay time, thereby generating a delayed signal; and a delayed pulse synthesizing circuit which synthesizes one of the delayed signals with the other of the delayed signals or with the receiving end output signal. 2. The receiving device according to claim 1, characterized in that, The received signal is composed of first and second pulse signals with different pulse successive occurrence times. 3. The receiving device according to claim 1, characterized in that, The receiving end is composed of a first antenna and a second antenna. 4. The receiving device according to claim 3, characterized in that: The first antenna outputs the receiving signal as the receiving end output signal, and the second antenna outputs the pulse signal specified in the receiving signal as the receiving end output signal. 5. The receiving device according to claim 3, characterized in that: relative to the output signal at the receiving end from the first antenna, the delay time of the output signal at the receiving end from the second antenna is set to The n-(2/3) period to n-(1/3) period of the output signal of the receiving end (n: natural number). 6. The receiving device according to claim 1, characterized in that, A distributing circuit is provided that distributes at least one of the receiving end output signals output from the receiving end. 7. The receiving device according to claim 6, characterized in that, For the distribution circuit and the delay circuit, or the delay circuit and the delayed pulse synthesis circuit, a coupler having a frequency characteristic is used. 8. The receiving device according to claim 6, characterized in that, With respect to the receiving end output signal from the antenna, the delay time of the signal allocated in the distribution circuit is set as n-(2/3) cycle to n-(1/3) of the receiving end output signal Period (n: natural number). 9. The receiving device according to claim 1, characterized in that, Reception demodulation is performed using a predetermined pulse signal in one of the delayed signals, a predetermined pulse signal in the other of the delayed signals, or a predetermined pulse signal in the receiving end output signal. 10. The receiving device according to claim 4, characterized in that, A continuous pulse generation time of the second pulse signal is longer than a continuous pulse generation time of the first pulse signal, and the predetermined pulse signal is the second pulse signal. 11. The receiving device according to claim 9, characterized in that, A continuous pulse generation time of the second pulse signal is longer than a continuous pulse generation time of the first pulse signal, and the predetermined pulse signal is the second pulse signal. 12. A sending device, comprising: a control signal generation circuit which outputs a control signal for generating a plurality of pulse signals having different pulse successive generation times; and a pulse generation circuit which generates the plurality of pulse signals by means of the control signal. 13. The sending device according to claim 12, characterized in that: An oscillation circuit is used as the pulse generating circuit. 14. The sending device according to claim 13, characterized in that: The frequency of the oscillation circuit is variable. 15. The sending device according to claim 13, characterized in that: The oscillation circuit is intermittently operated using the control signal. 16. The sending device according to claim 12, characterized in that: At least two signals having different pulse successive occurrence times are generated as the plurality of pulse signals. 17. The sending device according to claim 12, characterized in that: A communication state judging circuit is included, the communication state judging circuit judges the communication state with the wireless device of the communication partner, and the pulse continuous generation time of the pulse signal is changed based on the communication state judging information in the judging circuit. 18. The sending device according to claim 17, characterized in that: The continuous pulse generation time of the pulse signal is shortened based on determination information that the communication state is good in the determination circuit. 19. The sending device according to claim 17, characterized in that: The continuous pulse generation time of the pulse signal is lengthened based on the determination information of a poor communication state in the determination circuit. 20. The sending device according to claim 12, characterized in that: Among the pulse signals having different continuous pulse generation times, a shorter pulse signal is used for communication with the wireless device in the good communication state, and a pulse signal is used for communication with the wireless device in the bad communication state. A rectangular pulse signal among pulse signals with different timings that occurs continuously. 21. The sending device according to claim 12, characterized in that: An interference state detection circuit for detecting interference with another wireless device is provided, and pulses of the pulse signal are sequentially varied in time based on interference detection information in the interference state detection circuit. 22. The sending device according to claim 21, characterized in that: Based on the detection information of the presence of interference in the interference state detection circuit, the continuous pulse generation time of the pulse signal is lengthened. 23. The sending device according to claim 21, characterized in that: The continuous pulse generation time of the pulse signal is shortened based on the detection information of the absence of interference in the interference state detection circuit. 24. A wireless system comprising transmitting means and receiving means for receiving signals from said transmitting means, characterized in that, The transmission device includes: a control signal generation circuit that outputs a control signal for generating a plurality of pulse signals having different pulse successive generation times; and a pulse generation circuit that generates the plurality of pulse signals by the control signal, The receiving device includes: a receiving end, which receives a plurality of pulse signals with different continuous pulse generation times as a receiving signal; a delay circuit, which makes at least one of the receiving end output signals output from the receiving end output signals respectively delayed by different predetermined delay times, thereby generating delayed signals; and a delayed pulse synthesis circuit which synthesizes one of the delayed signals with the other of the delayed signals or with the receiving end output signal.

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