JPH11274969A - Radio communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide radio communication equipment on which two radio communication means are mounted, where a modulation/demodulation system or a path for up-conversion and down-conversion is selected between the radio communication means. SOLUTION: A radio communication means 123 (124) incorporates changeover devices 104, 105 (115, 116). The radio communication equipment uses the changeover device to select a path, depending on the transmission/reception system of the radio communication means 123, 124 and omits modulation/demodulation and base-band processing when both the means adopt the same transmission/ reception system for the transmission and reception. Even when the radio communication means 123, 124 use a different transmission/reception system, transmission/reception is conducted by the use of demodulators 103, 114, modulators 102, 113 and base-band processing sections 101, 112, in matching with the modulation demodulation system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication device having two radio communication means.

[0002]

2. Description of the Related Art In a conventional wireless communication apparatus equipped with two wireless communication means, each of the wireless communication means individually has a baseband processing section, a modulator, a demodulator, an up converter, and a down converter. When it is necessary to transmit information from one wireless communication means to the other wireless communication means, the information is temporarily converted into a baseband signal and then transmitted.

FIG. 3 is a configuration diagram showing a conventional wireless communication device. As shown in FIG. 3, in a conventional wireless communication device,
In the case of transmission, modulation is applied to the baseband signal, and then up-conversion to a higher frequency is performed, and the radio signal is transmitted from the antenna. In the case of reception, the received signal from the antenna is down-converted and converted to the baseband signal. Demodulate into a signal.

For example, when information received by the wireless communication means 323 shown in FIG.
In the wireless communication means 323, the frequency of the signal from the antenna 311 is reduced by the down converter 307,
At 03, the signal is demodulated into a baseband signal, and transmitted to the baseband processing unit 312 of the wireless communication unit 324 via the baseband processing unit 301.

[0005] Next, the baseband signal output from the baseband processing section 312 is modulated by a modulator 313, the frequency is changed to a high-frequency signal by an upconverter 315, and the signal is transmitted from an antenna 321.

[0006]

However, in the above configuration, even when the baseband processing, modulation scheme, and demodulation scheme of the two wireless communication means are the same, down-conversion, demodulation, modulation, and up-conversion are performed. Must be performed, and signal degradation will occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a wireless communication apparatus for selecting an optimal route between wireless communication means.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a radio communication apparatus according to the present invention switches communication paths according to a modulation scheme and switches connection between two radio communication sections according to a modulation scheme and a frequency used. Means and means for switching between the two modulation schemes.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises two radio communication means, and selects a modulation / demodulation path and an up-conversion or down-conversion path between the two radio communication means. When receiving (or transmitting) by one of the wireless communication means and transmitting (or receiving) by the other wireless communication means, a demodulation and modulation process, or up-conversion and down-conversion is performed. It is possible to omit the process of conversion, and it is possible to suppress information errors that occur at the time of modulation and demodulation and the generation of noise in the case of analog signals, thereby improving data communication efficiency.

Furthermore, by selecting different modulation schemes at the same frequency by two radio communication means, a plurality of corresponding radio systems can be selected.

An embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a block diagram of a wireless communication apparatus according to Embodiment 1 of the present invention.

In FIG. 1, reference numeral 123 denotes first wireless communication means, 1
24 is a second wireless communication means. First, the configuration and operation when the modulation and demodulation schemes of the two wireless communication units are different will be described.

When the information received by the first wireless communication means 123 is transmitted by the second wireless communication means 124, the signal received by the antenna 111 is raised in signal level by the low noise amplifier 109 and received by the down converter 107. The frequency of the demodulated signal is reduced to a frequency that can be demodulated by the demodulator 103.

Next, the switching device 105 selects a path so that the output of the down converter 107 is sent to the demodulator 103 and demodulates the output to a baseband signal.

After that, the modulator 113 passes through the baseband processing unit 101 of the first wireless communication unit 123 and the baseband processing unit 112 of the second wireless communication unit 124, using the modulation method used by the wireless communication unit 124. Perform modulation.

The switching device 115 selects the path of the output of the modulator 113 to the up-converter 117, and
After increasing the frequency to the transmission frequency of 24, the power amplifier 1
At 19, the signal level is raised to a predetermined output level and transmitted from the antenna 121.

Similarly, when the information received by the wireless communication means 124 is transmitted from the wireless communication means 123, the antenna 122, the low noise amplifier 120, the down converter 1
18, switching device 116, demodulator 114, baseband processing unit 112, baseband processing unit 101, modulator 10
2, wireless communication means 1 through the path of switching device 104, up-converter 106, power amplifier 108, antenna 110
The route is selected by the switching devices 116 and 104 as transmitted from 23.

Next, the configuration and operation when the modulation and demodulation method transmitted and received by the wireless communication means 123 and the modulation and demodulation method transmitted and received by the wireless communication means 124 are the same will be described.

When the information received by the wireless communication means 123 is transmitted by the wireless communication means 124, the signal received by the antenna 111 is transmitted to the low noise amplifier 109, the down converter 107, the switching device 105, and the switching device 115. Demodulator 10
3. Baseband processing units 101 and 112, modulator 113
, And transmitted from the antenna 121 via the up-converter 117 and the power amplifier 119.

Similarly, the signal received by the antenna 122 is transmitted to the low noise amplifier 120, the down converter 118, the switching device 116, the switching device 104, the up converter 10
6. The path is selected by the switching devices 116 and 104 so as to be transmitted on the path of the power amplifier 108 and the antenna 110.

When transmission / reception is performed using the transmission / reception frequency of the wireless communication means 123 and the modulation / demodulation method of the wireless communication means 124 and transmission / reception is performed using the transmission / reception frequency of the wireless communication means 124 and the modulation / demodulation method of the wireless communication means 123, The information received by the antenna 111 is the low noise amplifier 10
9, down converter 107, switching devices 105, 11
6, demodulator 114, baseband processing units 112 and 10
1, modulator 102, switching devices 104 and 115, up-converter 117, power amplifier 119, antenna 121
The switching devices 105 and 116 and 104 and 115 select a route so as to be transmitted from the wireless communication means 124 via the route.

Similarly, information received by the antenna 122 of the wireless communication means 124 is transmitted to the low noise amplifier 120,
From the wireless communication unit 123 via the path of the down converter 118, the switching devices 116 and 105, the demodulator 103, the baseband processing units 101 and 112, the modulator 113, the switching devices 115 and 104, the up converter 106, the power amplifier 108, and the antenna 110. Can be sent.

The baseband processing units 101 and 112 have a baseband external input / output unit and can transmit external baseband information from the wireless communication units 123 and 124.

According to the modulation method used by the wireless communication means 124, when transmitting at the frequency used by the wireless communication device 123, the baseband processing unit 112 and the modulator 1
13, the switching device 115, the switching device 104, the up-converter 106, and the antenna 11 via the power amplifier 108.
Transmission starts from 0.

When receiving at the frequency used by the wireless communication means 123 and the modulation method used by the wireless communication means 124, the signal is received by the antenna 122, and the low noise amplifier 120, the down converter 118, the switching device 116,
The signal is demodulated by the demodulator 103 via the switching device 105 and received by the baseband processing unit 101.

The switching device can be constituted by an array connection of analog switches. The transmitting antenna 110 and the receiving antenna 111, and the transmitting antenna 121 and the receiving antenna 122 may be shared.

(Embodiment 2) FIG. 2 is a block diagram of a wireless communication apparatus according to Embodiment 2 of the present invention, showing an embodiment of a double-conversion wireless communication apparatus. The difference from FIG. 1 is that the upconverter is doubled and the switching device is doubled.

Radio communication means 231 and radio communication means 232
When the same intermediate frequency and the same modulation method are used and the information received by the antenna 215 is transmitted by the antenna 229, the low noise amplifier 213 and the down converter 21
1. Transmission is performed from the switching device 209, the switching device 223, the up-converter 225, the power amplifier 227, and the antenna 229.

When the intermediate frequency is different or the modulation method is different, the same operation as in the first embodiment is performed.

[0030]

As described above, according to the present invention, when two wireless communication devices are provided with a device for switching a communication path to transmit / receive two wireless data subjected to the same modulation / demodulation and baseband processing, the modulation / demodulation and baseband are performed. There is no need to perform band processing, and deterioration of wireless data can be reduced.

Further, it is possible to use two modulation / demodulation systems selectable for one radio frequency.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a wireless communication device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a wireless communication device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a conventional wireless communication device.

[Explanation of symbols]

 101, 112 Baseband processing unit 102, 113 Modulator 104, 105, 115, 116 Switching device 106, 117 Upconverter 107, 118 Downconverter 108, 119 Power amplifier 109, 120 Low noise amplifier 110, 111, 121, 122 Antenna 123 124 wireless communication means

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tetsuya Nakano 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A radio communication apparatus comprising two radio communication means, and means for selecting a modulation / demodulation path and an up-conversion or down-conversion path between the two radio communication means.