JP3666018B2 - Transmission device, reception device, transmission method, and reception method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radio communication apparatus used in a digital radio communication system.
[0002]
[Prior art]
With the spread of mobile communication devices such as mobile phones and pagers in recent years, the number of users of such mobile communication devices has increased explosively. On the other hand, frequency resources that can be used for wireless communication are limited, and it is becoming extremely difficult to allocate a frequency band that is not used by an existing wireless system when a new wireless communication system is introduced.
[0003]
Under these circumstances, as a new radio technology that can effectively use frequency resources, an Ultra Wideband (UWB) transmission system has attracted attention in recent years. The ultra-wideband transmission system basically performs baseband transmission using a signal composed of a pulse train having a very fine pulse width (for example, 1 ns (nanosecond) or less). The occupied bandwidth is a bandwidth on the order of GHz such that a value obtained by dividing the occupied bandwidth by the center frequency (for example, 1 GHz to 10 GHz) is approximately 1, and the tuned W-CDMA method, cdma2000 method, In addition, the bandwidth is ultra-wide compared to the bandwidth used in a wireless LAN using SS (Spread Spectrum) or OFDM (Orthogonal Frequency Division Multiplexing).
[0004]
In addition, the ultra-wideband transmission system has the characteristic that it does not easily interfere with other wireless systems due to its low signal power density, and can be overlaid on the frequency band used by existing wireless systems. Expected as a technology. Furthermore, since it has a wider bandwidth, it is considered promising as an ultra-high-speed wireless transmission technology at the level of 100 Mbps for use in a personal area network (PAN).
[0005]
[Problems to be solved by the invention]
By the way, as a modulation method used for the ultra-wide band transmission method, for example, 0/1 using a signal in which the pulse generation timing is slightly shifted back and forth as described in JP-T-10-508725 and US Pat. No. 6,026,125. There is a pulse position modulation (PPM) that makes information represent. As another modulation scheme, bi-phase modulation has been proposed in which 0/1 information is represented by a change in the phase of a pulse.
[0006]
The DS (Direct Spread) method, which is a type of SS method, spreads and transmits the occupied band by multiplying the information signal by a random code sequence called PN (Pseudo Noise) code on the transmission side. The receiving side despreads the received spread information signal by multiplying the received spread information signal by the PN code to reproduce the information signal. In the UWB transmission system, the spreading factor of this information signal is increased to the limit. The signal spread by the UWB transmission system has only power below the noise level in each frequency region, and therefore a communication system using the UWB transmission system can coexist with other communication systems relatively easily. Has the advantage.
[0007]
FIG. 10 shows an example of transmission using the UWB system.
The input information 1001 is spread by the spreading sequence 1002. Depending on the system using the UWB system, there is a case where multiplication of the spreading sequence is omitted. The spread spectrum information signal 1003 is modulated using an impulse signal (wavelet pulse) in the UWB system (1004). As a modulation method, PPM (Pulse Position Modulation), phase modulation, amplitude modulation, and the like are considered.
[0008]
Since the impulse signal used in the UWB system is a very fine pulse, a very wide band is used in the frequency spectrum. As a result, the input information signal has only power below the noise level in each frequency region.
Although the received signal 1005 is confused with noise, it can be detected by calculating the correlation value between the received signal and the impulse signal. Furthermore, since signal spreading is performed in many systems, many impulse signals are transmitted for one bit of transmission information. Therefore, it is possible to further integrate the reception correlation value 1006 of the impulse signal by the length of the spreading sequence (1007), which further facilitates the detection of the transmission signal.
[0009]
FIG. 11 shows a configuration example of a wireless communication terminal using the UWB system. The wireless terminal 1101 includes elements 1111 to 1114 for transmission, elements 1103 to 1108 for reception, a transmission / reception timing control unit 1109, an RF unit 1102, and a central control unit 1110.
In transmission, after information source encoding 1114 and communication path encoding 1113 are performed on information to be transmitted, the information is stored in the transmission buffer 1112 and then input to the pulse circuit generator 1111 at an appropriate timing. Sent.
[0010]
In reception, the correlation value between the received signal and the UWB impulse signal is calculated (1103), and the output is integrated by the number of pulses corresponding to 1 bit of the transmission signal (1104). Thereafter, the integrated value output is A / D converted (1105) and stored in the reception buffer (1106). Information stored in the reception buffer is restored through channel decoding (1107) and information source decoding (1108).
[0011]
The RF unit 1102 performs transmission / reception switching, transmission / reception filter processing, signal amplification, and the like.
[0012]
FIG. 12 is a block diagram showing a more detailed configuration of a receiving apparatus using the ultra-wide band transmission method. FIG. 13 is a diagram showing correlation characteristics in the main part 1209 of the timing synchronization circuit having a so-called DLL (Delay Lock Loop) configuration of the receiving apparatus shown in FIG.
[0013]
The radio signal is received by the antenna 1201. This received signal is output to multipliers 1207, 1213, and 1210 after unnecessary components are removed by band-pass filter 1202.
[0014]
The spread code generator 1204 outputs a spread code sequence to the pulse generator 1205 at the frequency of the synthesizer 1203. The pulse generator 1205 generates a pulse, superimposes the spreading code sequence output from the spreading code generator 1204 on the pulse, and outputs the pulse to the delay units 1206 and 1212 and the multiplier 1210.
[0015]
Delay device 1206 delays the pulse on which the spread code sequence is superimposed by 1/2 pulse width and outputs the delayed pulse to multiplier 1207. The delay unit 1212 delays the pulse on which the spread code sequence is superimposed by one pulse width and outputs the delayed pulse to the multiplier 1213.
[0016]
Accordingly, multiplier 1207 multiplies the received signal by a pulse superimposed with a spread code sequence for demodulating transmission data, and performs despreading processing. Multiplier 1210 multiplies the received signal by a pulse superimposed with a spread code sequence at a timing preceding the output of delay unit 1206 by ½ pulse width, and performs despreading processing. Multiplier 1213 multiplies the received signal by a pulse superimposed with a spread code sequence at a timing delayed by ½ pulse width from the output of delay device 1206, and performs despreading processing.
[0017]
The multiplication result of the multiplier 1207 is output to the integrator 1208, integrated by the integrator 1208, and output as received data. The multiplication result of the multiplier 1210 is output to the integrator 1211, integrated by the integrator 1211, and output to the difference unit 1215 (1302 in FIG. 13). The multiplication result of the multiplier 1213 is output to the integrator 1214, integrated by the integrator 1214, and output to the difference unit 1215 (1301 in FIG. 13).
[0018]
The differencer 1215 takes the difference between the output of the integrator 1211 and the output of the integrator 1214 (1303 in FIG. 13: solid line), and outputs the difference to the loop filter 1216. As can be seen from FIG. 13, the output (vertical axis) responds linearly to the phase shift (horizontal axis). Therefore, the output (difference) obtained by filtering the difference by the loop filter 1216 is fed back to the synthesizer 1203.
[0019]
The synthesizer 1203 controls to slightly delay the generation phase of the spread code sequence if the output of the loop filter 1216 is positive, and slightly advance the generation phase of the spread code sequence if negative. As a result, the output (difference) of the loop filter 1216 becomes zero, the phase of the received signal and the pulse superimposed with the spreading code sequence supplied to the multiplier 1207 are aligned, and the despread output is maximized.
[0020]
In the apparatus based on the ultra wide band transmission method using the pulse generator described above, the pulse is very thin, and the pulse generation circuit and the pulse position detection circuit become complicated. Further, since the pulse is very fine, it is difficult to stabilize the pulse width in the pulse generation circuit, and there is a problem that the spectrum shape is not stable.
[0021]
In addition, it is necessary to synchronize the chip clock and pulse clock of the spread code sequence, and the delay amounts of the delay unit 1206 and the delay unit 1212 used in the main part 1209 of the timing synchronization circuit having the DLL configuration are as follows. The value is determined on the basis of the pulse width Tp, and the S-curve indicated by a solid line in FIG. 13 is as thin as the pulse width, so that a dead zone (shaded portion 1304 in FIG. 13) is formed in a portion where there is no signal. Therefore, there is a problem that the circuit becomes complicated. Moreover, since it is a pulse signal, there also exists a problem that a transmission signal becomes intermittent and instantaneous transmission power becomes high. Further, since many signals that are not desired to be emitted as radio waves are generated, there is a problem that a circuit for removing the signals becomes complicated.
[0022]
The present invention has been made in view of the above points, and an object of the present invention is to provide a wireless communication apparatus that has a simple circuit and that does not cause problems due to fine pulses.
[0023]
[Means for Solving the Problems]
As means for achieving the above object, the present invention has the following features.
[0024]
A first aspect of the present invention is a transmission device or a transmission method for performing communication using an ultra-wideband signal,
Means or step for generating a chip clock by fixedly dividing a carrier wave having a value from 1 GHz to 10 GHz;
Spreading code generation means or step for generating a spreading code sequence of a predetermined chip rate using the chip clock;
A converting means or step for converting a signal spread-modulated by the spreading code sequence into a transmission signal having a carrier frequency synchronized with the chip clock as a center frequency;
A transmission apparatus or a transmission method. Here, the means for generating the chip clock is composed of a synthesizer and a frequency divider, but it may be the synthesizer transmission frequency as it is (so-called frequency division by 1).
[0025]
The second aspect of the present invention is a transmission apparatus or transmission method for performing communication using an ultra-wideband signal,
A synthesizer or step for generating an oscillation signal of frequency T;
A frequency divider that receives the oscillation signal, generates a carrier wave having a frequency T / m that takes a value from 1 GHz to 10 GHz, and generates a chip clock signal having a frequency T / n by fixedly dividing the carrier wave signal. Or step,
A spreading code generator or step for generating a spreading code sequence signal using the chip clock signal;
A first multiplier or step for receiving a baseband signal and the spread code sequence signal and multiplying them to generate a spread spectrum signal;
A second multiplier or step for receiving the spread spectrum signal and the carrier signal having the frequency T / m and multiplying them to generate a transmission signal having a carrier frequency as a center frequency;
A transmission apparatus or a transmission method. Here, the frequency divider divides the transmission signal from the synthesizer to generate a clock signal and a carrier wave signal. Even if the transmission frequency of the synthesizer is unchanged (so-called division by 1, n = 1, m = 1). Good.
[0026]
The third aspect of the present invention is a receiving apparatus or receiving method for performing communication using an ultra-wideband signal,
Means or step for generating a chip clock synchronized in timing with a received signal by fixedly dividing a carrier wave having a value from 1 GHz to 10 GHz;
Spreading code generation means or step for generating a spreading code sequence of a predetermined chip rate using the chip clock;
A converting means or step for converting a received signal having a carrier frequency synchronized with the chip clock as a center frequency into a baseband signal;
Despreading means or step for performing a despreading process on the converted received signal using the spreading code sequence;
A receiving apparatus or a receiving method.
[0027]
The fourth aspect of the present invention is a receiving apparatus or receiving method for performing communication using an ultra-wideband signal,
A synthesizer or step for generating an oscillation signal of frequency T;
The oscillation signal is received from the synthesizer, a carrier wave having a frequency T / m taking a value from 1 GHz to 10 GHz is generated, and a chip clock signal having a frequency T / n is generated by fixedly dividing the carrier wave signal. A divider or step;
A spreading code generator or step for generating a despreading code sequence signal using the chip clock signal;
A first multiplier or step for receiving a received signal having a carrier frequency as a center frequency and multiplying the received signal by the reproduced carrier signal having the frequency T / m to generate a baseband signal;
A second multiplier or step for multiplying the baseband signal and a despread code sequence signal to generate a despread signal;
A receiving apparatus or a receiving method.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
The gist of the present invention is to convert a spread spectrum signal having a chip rate of several GHz to a multi-band transmission signal by frequency conversion with a carrier synchronized with a chip clock several times (rational number). On the receiving side, the chip clock and the carrier are synchronized, and the carrier synchronization is realized as it is by a circuit (timing synchronization circuit) that synchronizes with the chip clock.
[0029]
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0030]
FIG. 1 is a block diagram showing a configuration of a wireless communication apparatus (transmission apparatus) using a spread spectrum communication system according to an embodiment of the present invention. FIG. 2 is a diagram showing signal waveforms at various parts of the wireless communication apparatus shown in FIG. 3 is a diagram showing the signal spectrum of the data series in the wireless communication apparatus shown in FIG. 1, and FIG. 4 is a diagram showing the signal spectrum of the spread signal in the wireless communication apparatus shown in FIG. FIG. 6 is a diagram showing a signal spectrum of a carrier in the radio communication apparatus shown in FIG. 1, and FIG. 6 is a diagram showing a signal spectrum of a carrier modulated by a spread signal in the radio communication apparatus shown in FIG.
[0031]
1 includes a synthesizer 101 that is an oscillator, a frequency divider 102 that divides the frequency of the synthesizer 101, a spread code generator 103 that generates a spread code sequence at the divided frequency, and a spread code Multiplier 104 that multiplies the sequence and transmission signal, multiplier 105 that modulates the carrier with the spread signal, bandpass filter 106 that removes unnecessary components, and antenna 107 that transmits the transmission signal.
[0032]
The operation of the wireless communication apparatus having the above configuration will be described.
[0033]
The frequency divider 102 divides the frequency of the synthesizer 101 and outputs a chip clock to the spreading code generator 103. Here, the synthesizer 101 oscillates at a frequency of 4 GHz, and outputs the carrier SG102 (FIG. 2D) to the multiplier 105. Further, the frequency divider 102 divides the frequency of 4 GHz oscillated by the synthesizer 101 into ½ (that is, frequency division by 2), and outputs the result to the spread code generator 103 as a 2 GHz chip clock SG103.
[0034]
As described above, the chip clock is generated by dividing the oscillation frequency of one synthesizer, and the oscillation signal of the synthesizer is used as a carrier (carrier wave), so that the chip clock and the carrier are synchronized.
[0035]
Spreading code generator 103 outputs spreading code sequence SG1002 (FIG. 2B) to multiplier 104 with a 2 GHz chip clock. In the multiplier 104, for example, a transmission data sequence SG101 (FIG. 2 (a), FIG. 3) of 125 Mbps is multiplied (spread modulation) by the spreading code sequence SG104 to obtain a spread signal SG105 (FIG. 2 (c), FIG. 4). The spread signal SG105 is output to the multiplier 105. Note that the 2 GHz chip clock SG103 is 16 times the 125 Mbps transmission data sequence SG101, and the spreading here is 16 times spreading.
[0036]
In multiplier 105, carrier SG102 is modulated (frequency conversion centered on 4 GHz) with spread signal SG105, and modulated carrier SG106 (FIG. 2 (e), FIG. 5) is output to bandpass filter 106. In the band pass filter 106, unnecessary components are removed from the modulated carrier (frequency conversion signal) having a main lobe up to about 3.0 to 5.0 GHz, and the main lobe is extracted (FIG. 6). This extracted signal is transmitted as an ultra-wideband signal via the antenna 107. The above is the configuration of the transmitter, which is characterized in that it does not have a pulse generation circuit as compared with the conventional transmitter (FIG. 11).
[0037]
FIG. 7 is a block diagram showing a configuration of a wireless communication apparatus (reception apparatus) using a spread spectrum communication system according to an embodiment of the present invention. FIG. 8 is a diagram showing signal waveforms at various parts of the wireless communication apparatus shown in FIG. FIG. 9 is a diagram showing correlation characteristics in the main part 711 of the timing synchronization circuit having a so-called DLL (Delay Lock Loop) configuration of the wireless communication apparatus shown in FIG.
[0038]
The ultra wideband radio signal is received by the antenna 701. This received signal is output to the multiplier 703 as a received signal (FIG. 8A) after unnecessary components are removed by the band-pass filter 702. Multiplier 703 multiplies reception signal SG 701 by reproduction carrier SG 702 (FIG. 8B) to perform frequency conversion, and outputs reception spread signal SG 703 (FIG. 8C) to multipliers 708, 715 and 712. The
[0039]
The frequency divider 705 divides the frequency of the synthesizer 704 and outputs a chip clock to the spreading code generator 706. Here, synthesizer 704 oscillates at a frequency of 4 GHz, and outputs carrier SG 702 (FIG. 8B) to multiplier 703. Further, the frequency divider 705 divides the 4 GHz frequency oscillated by the synthesizer 704 into ½ (that is, divides by 2) and outputs it to the spread code generator 706 as a 2 GHz chip clock.
[0040]
Thus, the chip clock is generated by dividing the oscillation frequency of the synthesizer, so that the chip clock and the carrier are synchronized.
[0041]
The spreading code generator 706 delays 707 and 714 a despreading code sequence (the same spreading code sequence as that used in the wireless communication apparatus shown in FIG. 1) at the frequency of the chip clock supplied from the frequency divider 705. And output to the multiplier 712.
[0042]
Delay unit 707 delays the despread code sequence by a ½ chip period and outputs the delayed sequence to multiplier 708. The delay unit 714 delays the despread code sequence by one chip period and outputs it to the multiplier 715. In the present embodiment, chip period = 1 / chiprate = 500 ps (picosecond).
[0043]
Therefore, in the multiplier 708, in order to finally demodulate the transmission data in which the timing is synchronized, the despread code sequence SG705 (FIG. 8 (d)) is multiplied by the received signal at the center timing of the chip interval, A despreading process is performed. The multiplier 712 multiplies the received signal by the despread code sequence at a timing preceding the spread code sequence SG705 by a ½ chip period, and performs despread processing. Further, the multiplier 715 multiplies the received signal by the spread code sequence at a timing delayed by ½ chip period from the despread code sequence SG705, and performs despread processing.
[0044]
A multiplication result SG704 (despread signal, FIG. 8 (e)) of the multiplier 708 is output to the integrator 709, and is integrated by 8 ns (= 1/125 Mhz) in the data bit interval by the integrator 709 to receive data SG706. (FIG. 8 (f), FIG. 9, 904) is output. The multiplication result SG704 of the multiplier 712 is output to the integrator 713, integrated by the integrator 713, and output to the differencer 717 (902 in FIG. 9). The multiplication result of the multiplier 715 is output to the integrator 716, integrated by the integrator 716, and output to the differencer 717 (901 in FIG. 9).
[0045]
The differencer 717 takes the difference between the output of the integrator 713 and the output of the integrator 716 (903 in FIG. 9: solid line) and outputs the difference to the loop filter 718. As can be seen from FIG. 9, the output (vertical axis) linearly responds to the phase shift (horizontal axis). That is, the S timing curve is obtained by the reception timing offset.
[0046]
Therefore, an output (difference) obtained by filtering the difference by the loop filter 718 is fed back to the synthesizer 704. For example, in the characteristics shown in FIG. 9, 0 having no reception timing offset is output, and when the reception timing offset deviates back and forth, a positive / negative value is output as the timing offset signal. Reference numeral 711 indicates a main part of a timing synchronization circuit (DLL: Delay Lock Loop) that performs such timing synchronization.
[0047]
The synthesizer 704 controls the oscillation signal so as to slightly delay the generation phase of the spread code sequence if the output of the loop filter 718 is positive, and slightly advance the generation phase of the spread code sequence if negative. As a result, when the timing is synchronized, the output (difference) of the loop filter 718 becomes zero, the phases of the spread code sequence and the received signal are aligned, the despread output of the multiplier 708 is maximized, and the timing Transmission data is demodulated in a synchronized state.
[0048]
As described above, according to the present embodiment, since the transmission signal is continuous, the instantaneous transmission power can be kept low, and the circuit on the receiving side can be easily configured without a dead zone when configuring the chip rate synchronization circuit. Can be configured.
[0049]
In addition, according to the present embodiment, the chip clock is generated by dividing the oscillation frequency of the synthesizer, so that the chip clock and the carrier are synchronized. For this reason, since the circuit (timing synchronization circuit) synchronized with the chip clock realizes carrier synchronization as it is, the receiving apparatus can be configured with a simple circuit.
[0050]
The present invention is not limited to the embodiment described above, and can be implemented with various modifications. For example, the frequency and chip rate in the above embodiment are not particularly limited, and various modifications can be made. Further, in this embodiment, a synthesizer and a frequency divider are used as means for generating a chip clock or a carrier wave signal. However, a transmission signal of the synthesizer as it is without using a frequency divider (so-called frequency division by 1). May be used as a chip clock.
[0051]
Further, in the above-described embodiment, the case where a multiplier is used when a transmission signal is modulated with a spread code sequence or a carrier is modulated with a spread signal has been described. An EX-OR circuit may be used.
[0052]
Further, in the above embodiment, the oscillation signal of the synthesizer 101 is supplied directly to the multiplier 105 as the carrier SG102 (that is, not divided (divided by 1)) on the transmission side, and the synthesizer 704 is configured on the reception side. The oscillation signal is supplied directly to the multiplier 703 as the reproduction carrier SG702 (that is, without being divided (divided by 1)), and the oscillation signal of the synthesizer 101 and the oscillation signal of the synthesizer 704 are respectively divided by m (m is (Integer) may be supplied to the multiplier 105 and the multiplier 703.
[0053]
Further, in the above embodiment, when a chip clock is generated at a half frequency of the carrier frequency, that is, in the frequency divider 102 and the frequency divider 705, the oscillation signals of the synthesizer 101 and the synthesizer 704 are respectively divided into two. In the present invention, the frequency divider 102 and the frequency divider 705 divide by n (n is an integer), and a spread spectrum signal having a chip rate of several GHz is several times that number. N is not limited to 2 as long as it can be converted into a transmission signal by frequency conversion with a carrier synchronized with a chip clock of a rational multiple of n / m (for example, 10 or less).
[0054]
【The invention's effect】
As described above, the wireless communication apparatus according to the present invention converts the frequency of a spread spectrum signal having a chip rate of several GHz with a carrier synchronized with a chip clock that is several times (rational number) of the signal to generate a transmission signal. The chip clock and the carrier can be synchronized on the side, carrier synchronization can be realized as it is with a circuit synchronized with the chip clock, and the receiving apparatus can be configured with a simple circuit on the reception side.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a wireless communication apparatus (transmitting apparatus) using a spread spectrum communication system according to an embodiment of the present invention.
FIG. 2 is a diagram showing signals in the wireless communication apparatus shown in FIG.
3 is a diagram showing a signal spectrum of a data series in the wireless communication apparatus shown in FIG. 1. FIG.
4 is a diagram showing a signal spectrum of a spread signal in the wireless communication apparatus shown in FIG.
5 is a diagram showing a carrier signal spectrum in the wireless communication apparatus shown in FIG. 1. FIG.
6 is a diagram showing a signal spectrum of a carrier modulated by a spread signal in the wireless communication apparatus shown in FIG.
FIG. 7 is a block diagram showing a configuration of a wireless communication apparatus (reception apparatus) using a spread spectrum communication system according to an embodiment of the present invention.
8 is a diagram showing signals in the wireless communication apparatus shown in FIG.
9 is a diagram showing correlation characteristics in the wireless communication apparatus shown in FIG.
FIG. 10 is a diagram illustrating an example of transmission using the UWB scheme.
FIG. 11 is a diagram illustrating a configuration example of a wireless communication terminal using a UWB scheme.
FIG. 12 is a block diagram illustrating a configuration of a receiving device using an ultra-wide band transmission method when a pulse generator is used.
13 is a diagram showing correlation characteristics in the receiving apparatus shown in FIG.
[Explanation of symbols]
101, 704 ... synthesizer 102, 705 ... frequency divider 103, 706 ... spreading code generator 104, 105, 703, 708, 715, 712 ... multiplier 106, 702 ... band pass filter 107, 701 ... antenna 707, 714 ... Delay units 709, 713, 716 ... integrator 711 ... DLL circuit 717 ... difference unit 718 ... loop filter

Claims (16)

A transmission device for performing communication using an ultra-wideband signal,
Means for generating a chip clock by fixedly dividing a carrier wave having a value from 1 GHz to 10 GHz;
Spreading code generating means for generating a spreading code sequence of a predetermined chip rate using the chip clock;
Conversion means for converting a signal spread-modulated by the spread code sequence into a transmission signal having a carrier frequency synchronized with the chip clock as a center frequency;
A transmission device comprising: The carrier frequency is a rational multiple of the chip rate of the spreading code sequence.
The transmission apparatus according to claim 1, wherein: A transmission device for performing communication using an ultra-wideband signal,
A synthesizer that generates an oscillation signal of frequency T;
A frequency divider that receives the oscillation signal, generates a carrier wave having a frequency T / m that takes a value from 1 GHz to 10 GHz, and generates a chip clock signal having a frequency T / n by fixedly dividing the carrier wave signal. When,
A spreading code generator for generating a spreading code sequence signal using the chip clock signal;
A first multiplier that receives a baseband signal and the spread code sequence signal and multiplies them to generate a spread spectrum signal;
A second multiplier that receives the spread spectrum signal and the carrier signal having the frequency T / m and multiplies them to generate a transmission signal having a carrier frequency as a center frequency;
A transmission device comprising: N / m is a positive rational number of 10 or less,
The transmission apparatus according to claim 3. A receiving device for performing communication using an ultra-wideband signal,
Means for generating a chip clock synchronized in timing with a received signal by fixedly dividing a carrier wave having a value from 1 GHz to 10 GHz;
Spreading code generating means for generating a spreading code sequence of a predetermined chip rate using the chip clock;
Conversion means for converting a received signal having a carrier frequency synchronized with the chip clock as a center frequency into a baseband signal;
Despreading means for performing a despreading process on the converted reception signal using the spreading code sequence;
A receiving apparatus comprising: The frequency of the recovered carrier is a rational multiple of the chip rate of the spreading code sequence.
The receiving apparatus according to claim 5. A receiving device for performing communication using an ultra-wideband signal,
A synthesizer that generates an oscillation signal of frequency T;
The oscillation signal is received from the synthesizer, a carrier wave having a frequency T / m taking a value from 1 GHz to 10 GHz is generated, and a chip clock signal having a frequency T / n is generated by fixedly dividing the carrier wave signal. A divider,
A spreading code generator for generating a despreading code sequence signal using the chip clock signal;
A first multiplier that receives a received signal having a carrier frequency as a center frequency, and multiplies the received signal by a reproduced carrier signal having the frequency T / m to generate a baseband signal;
A second multiplier that multiplies the baseband signal and a despread code sequence signal to generate a despread signal;
A receiving apparatus comprising: N / m is a positive rational number of 10 or less,
The receiving apparatus according to claim 7. A transmission method for performing communication using an ultra-wideband signal,
Generating a chip clock by fixedly dividing a carrier wave having a value from 1 GHz to 10 GHz;
Generating a spreading code sequence of a predetermined chip rate using the chip clock;
A conversion step of converting a signal that is spread-modulated by the spread code sequence into a transmission signal having a carrier frequency synchronized with the chip clock as a center frequency;
The transmission method characterized by comprising. The carrier frequency is a rational multiple of the chip rate of the spreading code sequence.
The transmission method according to claim 9. A transmission method for performing communication using an ultra-wideband signal,
Generating an oscillation signal of frequency T;
Receiving the oscillation signal, generating a carrier wave having a frequency T / m having a value from 1 GHz to 10 GHz, and fixedly dividing the carrier signal to generate a chip clock signal having a frequency T / n;
Generating a spread code sequence signal using the chip clock signal;
Receiving a baseband signal and the spread code sequence signal and multiplying them to generate a spread spectrum signal;
Receiving the spread spectrum signal and a carrier signal having the frequency T / m, and multiplying them to generate a transmission signal having the carrier frequency as a center frequency;
The transmission method characterized by comprising. N / m is a positive rational number of 10 or less,
The transmission method according to claim 11. A reception method for performing communication using an ultra-wideband signal,
Generating a chip clock that is synchronized in timing with a received signal by fixedly dividing a carrier wave having a value from 1 GHz to 10 GHz;
Generating a despread code sequence of a predetermined chip rate using the chip clock;
Converting a received signal having a carrier frequency synchronized with the chip clock as a center frequency into a baseband signal;
Performing a despreading process on the received signal converted into the baseband signal using the despread code sequence;
A receiving method comprising: The frequency of the recovered carrier is a rational multiple of the spreading code sequence chip rate.
The reception method according to claim 13. A reception method for performing communication using an ultra-wideband signal,
Generating an oscillation signal of frequency T;
Receiving the oscillation signal from the synthesizer, generating a carrier wave having a frequency T / m having a value from 1 GHz to 10 GHz, and fixedly dividing the carrier signal to generate a clock signal having a frequency T / n. When,
Generating a despread code sequence signal using the clock signal;
Receiving a received signal having a carrier frequency as a center frequency, and multiplying the received signal by a reproduced carrier signal having the frequency T / m to generate a baseband signal;
Multiplying the baseband signal and a despread code sequence signal to generate a despread signal;
A receiving method comprising: N / m is a positive rational number of 10 or less,
The receiving method according to claim 15.

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