WO2005112380A1

WO2005112380A1 - Wireless communication method and wireless communication system

Info

Publication number: WO2005112380A1
Application number: PCT/JP2004/006441
Authority: WO
Inventors: Yozo Shoji; Hiroyo Ogawa
Original assignee: National Institute Of Information And Communications Technology
Priority date: 2004-05-13
Filing date: 2004-05-13
Publication date: 2005-11-24
Also published as: JP4448942B2; JPWO2005112380A1

Abstract

Wireless communication method and system suitable for allowing a high-rate burst communication to be performed even in a high frequency band and for realizing a superfast wireless access system. A transmitter transmits, in a first polarization direction, a first radio modulated signal as modulated with transmitted information, while transmitting, in a second polarization direction that is orthogonal to the first polarization direction, a second radio modulated signal as modulated with a complementary signal and from which clock frequency divided signals are to be produced by subjecting the first and second radio modulated signals to a predetermined signal processing. A receiver reproduces the clock signal by subjecting the first and second radio modulated signals to the predetermined signal processing, and then uses the clock signal to demodulate the first radio modulated signal as synchronously detected or asynchronously detected.

Description

Specification

Wireless communication method and wireless communication system

Technical field

The present invention relates to a radio communication method and radio communication system for a predetermined digitally modulated signal.

More specifically, the present invention relates to a technique for realizing high transmission efficiency.

Conventional background

In recent years, an ultra-high-speed wireless access system using a high frequency band such as a millimeter wave band of 30 GHz or more has been studied. In such systems, the application of multiple access technologies such as FDMA and TDMA is indispensable in order to share the same frequency band among multiple wireless terminals and subscriber stations.

In particular, the TDMA method tends to be used favorably in terms of flexibility regarding information asymmetry in the uplink and downlink and simplification of equipment.

[0003] In order to construct an ultra-high-speed wireless access system using the TDMA method, it is necessary to realize a modem capable of high-speed burst communication for transmitting short-time packets using high-speed modulated signals. Here, the high-speed burst communication includes, for example, gigabit-class communication.

[0004] However, the conventional techniques have the following problems, and it has been difficult to provide such modulation / demodulation devices.

Common problems include difficulty in realizing an auto gain control (AGC) that can respond at high speed, and difficulty in reproducing a high-speed clock in baseband. In the former case, the access signal level called FWA (Fixed Wireless Access) such as fixed access and subscriber access, and communication that does not involve very high-speed movements in accordance with this, have little fluctuation in the received signal level. Although this may not be a major problem, the latter problem is inevitable in realizing high-speed burst communication.

[0005] As a well-known technique for regenerating a high-speed clock, a preamble part that is a predetermined bit string (for example, a sequence of ten consecutive bits) is inserted at the beginning of a burst signal, and at the same time, a PLL circuit for clock regeneration is used. There is a method that can be realized by providing the. This method also has a problem that the preamble has to be lengthened as synchronization becomes difficult due to ultra-high-speed communication, which substantially presses the payload. For example, in a TDMA system accommodating a large number of mobile terminals even in the current communication of about 100 to 200 Mbps, a preamble section of 10% or more must be provided, and the transmission efficiency deteriorates.

[0006] Further, as another problem for realizing high-speed burst communication, especially in millimeter wave band communication, a synchronous carrier regeneration circuit (PLL circuit ゃ Costas loop circuit) is required due to the large instability of the carrier frequency. It is difficult to configure.

[0007] In order to overcome this, the conventional technology uses a millimeter-wave oscillator using an expensive external stabilizing circuit, or uses a frequency that is not significantly affected by frequency instability such as ASK modulation. A low efficiency, basic modulation scheme was used.

Such a conventional method requires a special circuit configuration corresponding to a high frequency band, and thus has a problem that the cost is high and a modulation method is limited.

Disclosure of the invention

[0008] The present invention enables high-speed burst communication even in the high frequency band as described above, and aims at realizing an ultra-high-speed wireless access system, and provides a wireless communication method and system suitable for that purpose. In order to do so, the following means have been created.

That is, the present invention is a wireless communication method for transmitting transmission information digitally modulated using a predetermined digital modulation method between a transmitter and a receiver. In the configuration according to claim 1, a first wireless modulation signal modulated with the transmission information is transmitted from a transmitter in a first polarization direction, and a predetermined signal processing is performed directly with the first wireless modulation signal. The second radio modulation signal modulated with the complementary signal, which generates a clock signal or a frequency-divided signal of a clock whose generation is easy, is performed by a second polarization orthogonal to the first polarization direction. Transmit in the direction.

On the other hand, in the receiver, the clock signal is reproduced by the above-described signal processing of the first radio modulation signal and the second radio modulation signal, and the first radio modulation signal detected synchronously or asynchronously is reproduced. Demodulation is performed using the clock signal.

[0010] Also, in the configuration according to claim 2, the predetermined signal processing in claim 1 is multiplication processing, and the first radio modulation signal and the second radio modulation signal are received in a receiver. signal A clock signal or a frequency-divided signal of a clock whose generation is easy is reproduced from the product component of the clock signal.

[0011] A configuration according to claim 3 is the same wireless communication method, wherein a first wireless modulation signal modulated with transmission information is transmitted from a transmitter in a first polarization direction, and the transmission information and the first wireless modulation signal are transmitted. By performing a predetermined logical operation, a clock signal or a frequency-divided signal of a clock whose generation is easy to generate is generated. Is transmitted in the second polarization direction orthogonal to.

Then, the receiver reproduces the clock signal by the logical operation of the detection output obtained from the first wireless modulation signal and the detection output obtained from the second radio modulation signal, and performs synchronous detection or asynchronous detection. The demodulated first wireless modulation signal is demodulated using the clock signal.

[0012] A configuration according to claim 4 is the configuration according to claim 3, wherein the predetermined logical operation is an exclusive OR, and the exclusive logical sum of the radio modulation signal and the complementary signal is obtained in the receiver. The clock signal is reproduced from the sum.

[0013] In the configuration according to claim 5, in the same wireless communication method, the transmitter transmits the wireless modulation signal of the transmission information in the first polarization direction and easily generates the clock signal or the clock signal. A second wireless modulation signal modulated by a complementary signal that is the frequency-divided signal is transmitted in a second polarization direction orthogonal to the first polarization direction.

On the other hand, in the receiver, the clock signal is reproduced by detecting the second radio modulation signal, and the transmission information is demodulated using the clock signal of the first radio modulation signal detected synchronously or asynchronously. It is characterized by doing.

[0014] A configuration according to claim 6 is the radio communication method according to claims 1 and 2, claim 3 and 4, or claim 5, wherein the transmitter operates the phase of the second radio modulation signal. Equal to the first radio modulation signal, and are sequentially shifted by π / η (η is an integer) at the symbol transmission timing and transmitted, or only the even-numbered transmission symbols are shifted by π Ζη (η is an integer). And send.

Further, the receiver reproduces the clock by signal processing between the first and second radio modulation signals, or reproduces the clock signal directly from only the second radio modulation signal, and The first wireless modulation signal is synchronously detected and demodulated using a second wireless modulation signal whose phase is regularly shifted for each symbol.

[0015] In the configuration according to claim 7, the digital modulation scheme is a binary phase shift keying scheme (B

PSK method) or multi-level phase shift keying method (M-array PSK method).

[0016] Further, in the configuration according to claim 8, the digital modulation scheme is a multi-level quadrature amplitude modulation scheme.

(QAM method).

[0017] The configuration according to claim 9 is the configuration according to claim 8, wherein the second radio is transmitted in advance so that the amplitude of the clock signal is constant when the transmitter reproduces the clock signal in the receiver. The modulation signal is transmitted while controlling its amplitude.

[0018] Alternatively, in the configuration according to claim 10, in the configuration disclosed in claim 8, the second wireless modulation signal is previously set so that the composite envelope of the signal output from the transmitter is constant. The transmission is characterized by controlling the amplitude.

According to the configuration described in claim 11, the transmitter uses the configuration of claims 1 to 10 in the radio burst header portion or the brimble portion to transmit the complementary signal for reproducing the clock signal on the receiver side to the second signal. The second wireless modulation signal is transmitted by the second wireless modulation signal, and then the second wireless modulation signal modulated by the second transmission information different from the transmission information used for the modulation of the first wireless modulation signal is generated. The transmitting force S can be in the second polarization direction orthogonal to the one polarization direction.

[0019] The present invention can also provide a wireless communication system including a transmitter and a receiver for communicating transmission information digitally modulated using a predetermined digital modulation scheme. This wireless communication system is realized by implementing the above wireless communication method.

[0020] The configuration of the present invention described above has the following effects.

In other words, according to the wireless communication method of claims 1 to 5, the clock can be instantaneously reproduced on the receiving side without using a very short preamble length or providing a preamble part, so that the transmission efficiency is extremely high and high speed. Wireless transmission is possible. At this time, the synchronization clock input time is practically unnecessary, and the transmission efficiency is close to 100%. Furthermore, even when jitter occurs in the transmission symbol sequence, the clock that gives the ideal symbol decision time is also transmitted and transmitted, so that signal degradation does not occur. [0021] Furthermore, since a PLL circuit for clock recovery is not required, wireless communication can be easily realized and also contributes to low cost.

According to the wireless communication method described in claim 6, in addition to the above, it is equivalent to synchronous (orthogonal) detection with a carrier signal in a radio frequency band (RF) used for modulation on the transmitting side. Even if a low-cost RF oscillator with poor frequency stability is used for the transmitter, it is possible to stably transmit a high-efficiency modulation signal such as a multilevel quadrature modulation signal, and to reduce the cost of the transmitter. You can also.

[0023] Also, the receiver does not require a carrier recovery circuit for synchronous detection and an RF oscillator, which contributes to cost reduction.

[0024] In the wireless communication method according to claim 7, a binary phase shift keying (BPSK) or a multi-level phase shift keying (M-array PSK) can be used as a digital modulation method.

[0025] In the wireless communication method according to claims 8 to 10, a multi-level quadrature amplitude modulation method (QAM method) can be used.

[0026] According to the configuration of claim 11, after transmitting a complementary signal for clock recovery for a required time, different transmission information can be transmitted simultaneously in orthogonal polarization components. Contribute to improvement.

[0027] Similarly, in the wireless communication system according to the twelfth to sixteenth aspects, the clock can be instantaneously reproduced on the receiving side, so that high-speed wireless transmission with extremely high transmission efficiency can be performed. Even when a jitter occurs in the transmission symbol sequence, since a clock that gives an ideal symbol determination time is also transmitted, signal deterioration due to this is not caused. Since a PLL circuit for clock regeneration is not required, the realization of a wireless communication system is facilitated and the cost is reduced.

[0028] According to the wireless communication system of claim 17, in addition to the above, synchronous (orthogonal) detection with a carrier signal in a radio frequency band (RF) used for modulation on the transmitting side is equivalent to transmission. Even if a low-cost RF oscillator with poor frequency stability is used for the transmitter, it is possible to stably transmit high-efficiency modulation signals such as multi-level quadrature modulation signals, and to reduce the cost of the transmitter. You can also. Also, the receiver does not need a carrier recovery circuit for synchronous detection and an RF oscillator, which contributes to low cost.

[0029] In the wireless communication system according to claim 18, it is possible to use a binary phase shift keying (BPSK) or a multi-level phase shift keying (M-array PSK) as a digital modulation scheme. .

[0030] Further, in the wireless communication system according to claims 19 to 21, a multi-level quadrature amplitude modulation method (QAM method) can be used.

According to the configuration of claim 22, after transmitting a complementary signal for clock recovery for a required time, different transmission information can be transmitted simultaneously in orthogonal polarization components, so that wireless communication with extremely high transmission efficiency can be performed. A system can be provided.

Brief Description of Drawings

FIG. 1 is a signal diagram according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a transmitter according to Embodiment 1 of the present invention.

FIG. 3 is a configuration diagram of a receiver (Embodiment 1) in Embodiment 1 of the present invention.

FIG. 4 is a configuration diagram of a receiver (Embodiment 2) in Embodiment 1 of the present invention.

FIG. 5 is a configuration diagram of a receiver (Embodiment 3) in Embodiment 1 of the present invention.

FIG. 6 is a configuration diagram of a receiver (Embodiment 4) in Embodiment 1 of the present invention.

FIG. 7 is a signal diagram according to Embodiment 2 of the present invention.

FIG. 8 is a signal diagram according to a third embodiment of the present invention.

FIG. 9 is a configuration diagram of a receiver according to a third embodiment of the present invention.

FIG. 10 is a signal diagram according to a fourth embodiment of the present invention.

FIG. 11 is a configuration diagram of a transmitter according to a fourth embodiment of the present invention.

FIG. 12 is a configuration diagram of a receiver according to a fourth embodiment of the present invention.

FIG. 13 is a signal diagram showing a signal and an auxiliary signal according to a fifth embodiment of the present invention, and a clock signal obtained by multiplying them by a product.

FIG. 14 is a configuration diagram of a transmitter according to Embodiment 5 of the present invention.

FIG. 15 is a configuration diagram of a receiver according to Embodiment 5 of the present invention.

FIG. 16 is a signal diagram illustrating generation of a divided signal clock signal. FIG. 17 is a configuration diagram of a receiving circuit when generating a clock signal.

FIG. 18 is an embodiment of an antenna for transmitting and receiving V polarization and H polarization according to the embodiment of the present invention.

FIG. 19 is another embodiment of the antenna for transmitting and receiving right-handed polarization and left-handed polarization according to the embodiment of the present invention.

Explanation of symbols

[0032] 31: V polarization receiving antenna

32: H polarized wave receiving antenna

33: Polarization converter

34: Amplifier

35: Bandpass filter

36: RF band local oscillator

37: Synchronous detection circuit

38: Mixer

39: Low-pass filter

40: Baseband signal processor (demodulation circuit)

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings. The embodiment is not limited to the following.

The present invention transmits a first radio modulation signal digitally modulated with information to be transmitted with a polarization in a certain direction, and also generates a clock signal or a frequency-divided signal that facilitates generation of a clock signal, or a first radio signal. The main purpose is to transmit a second radio modulation signal modulated by a complementary signal that can generate the modulated signal by performing predetermined signal processing or logical operation on a polarization orthogonal to the above polarization. is there.

As a wireless communication method using orthogonal polarization, there is a technique disclosed in Patent Document 1 by the present applicant. The transmitter of this technology generates an RF-band unmodulated carrier equivalent to the signal when the modulated signal is not superimposed on the wireless modulated signal to be transmitted, and generates the wireless modulated signal with a polarization orthogonal to the wireless modulated signal. Transmit with the signal. The receiver extracts and reproduces only the unmodulated carrier component from one of the polarization components of the received signal, and uses this signal to synchronously detect the radio modulation signal extracted from the other polarization component.

Patent Document 1: JP 2003-273763 A

[0035] According to the present technology, even if phase noise or frequency offset occurs in the millimeter-wave band oscillation signal used when generating the radio modulation signal, the unmodulated carrier is transmitted together, so that the same characteristics as the radio modulation signal are obtained. As a result, the wireless modulation signal is synchronously detected using the unmodulated carrier that has deteriorated, and as a result, it is possible to cancel the phase noise and the frequency offset simultaneously with the demodulation.

[0036] Unlike the technique, the present invention transmits a complementary signal that can obtain a clock signal for demodulating a received signal in a receiver with a polarization component orthogonal to the polarization component of the radio modulation signal. It is suggested that.

Further, as in a plurality of embodiments described below, by adopting various forms of complementary signals, it is possible to cope with various digital modulation schemes and to provide other functions. It is art.

Example 1

FIG. 1 shows a data signal (10) transmitted with a first polarization component and a complement transmitted with a second polarization component orthogonal to the first polarization component in Embodiment 1 of the present invention. FIG. 11 is a signal diagram showing the appearance of a signal (11) and a clock signal (12) to be reproduced. The present embodiment is a configuration according to claims 1, 2, 7, 12, 13, and 18 of the present invention.

FIG. 1 shows the case of BPSK (Binary Phase Shift Keying) modulation. In this modulation method, when the phase of the data signal (10) is inverted (for example, 13 in the figure), a complementary signal is used. The phase of (11) is maintained. On the other hand, if the phase of the data signal (10) is maintained (for example, 14 in the figure), the phase of the complementary signal (11) is inverted.

FIG. 2 shows a configuration diagram of the transmitter (20) of the wireless communication system according to the present invention. An information signal (21) to be transmitted is input to the transmitter (20), and a data signal (10) is first generated from the information signal (21) in a baseband signal processing device (22). This processing is a processing that has been used before, and is mainly performed by the information signal (21). It is modulated by a predetermined digital modulation method (here, BPSK).

However, in the present invention, as described above, a long preamble portion is unnecessary or can be greatly reduced.

[0042] Then, as a feature of the present invention, in the baseband signal processing device (22), when multiplied by the data signal (10), a clock signal or a divided signal of a clock that can be easily generated is obtained. Generate a signal (11). The generation can be realized at high speed and simply by simple signal processing.

By this processing, a data signal (10) and a complementary signal (11) as shown in FIG. 1 are prepared.

Then, the local oscillation signal from one RF band local oscillator (23) is input to the mixers (24) and (24), and the data signal (10) and the auxiliary signal (11) are increased from the baseband to the millimeter wave band. Comparing.

[0044] The signal is converted into a radio modulation signal through the band pass filters (25) and (25), and is amplified by the amplifiers (26) and (26).

Further, in the polarization converters (27) and (27), the data signal (10) which is polarized into the first polarization component and the second polarization component, respectively, is converted into a V-polarized wave by the antenna (28). Therefore, the converted complementary signal (11) is simultaneously transmitted from the antenna (29) with the H polarization.

Next, the configuration of the receiver according to the present invention will be described. Fig. 3 shows the first form of the receiver. The antennas (31) and (32), which receive only the respective polarization directions, use the V polarization and

Receive the H polarization component.

After the received signal is unified to the same polarization component by the polarization converter (33), the amplifier (34) (

Each is amplified by 34) and passes through a band pass filter (35) (35).

The received signal from the V-polarized antenna (31) is branched after the band pass filter (35), and on the other hand, a synchronous detection circuit (37) that receives the local oscillation signal from the RF band local oscillator (36) In step 37), synchronous detection using homodyne detection or heterodyne detection is performed. As a result, it is converted into a baseband signal (data signal) (10 ').

The other branched signal is input to a mixer (38), which generates a product component with the received signal from the H-polarized antenna (32) which is also input, and passes a low-pass filter (39). After that, the clock signal (11 ') is reproduced. [0047] The baseband signal (10,) and the clock signal (11,) generated in this way are input to the baseband signal processing device (40), and the information transmitted from the detected baseband signal (10 ') is transmitted. Demodulate the broadcast signal.

According to the present invention, as described above, the clock signal can be instantaneously reproduced on the receiving side, so that the time for inserting the clock for synchronization is substantially unnecessary, and the preamble length, which conventionally required a sufficient time, is unnecessary. Alternatively, it can be made very short, which contributes to the improvement of transmission efficiency.

Further, since the clock can be reproduced without the need for the PLL circuit provided for the clock reproduction, the receiver can be simplified and the cost can be reduced.

[0050] The receiver of the present invention can be realized in different modes. FIG. 4 shows a second embodiment of the receiver (30a). The same components as those in the first embodiment will be described using the same reference numerals.

In the present embodiment, in addition to the antenna (31) for receiving the V-polarized component, an antenna (41) for receiving the 45-degree polarized wave is provided. The 45-degree polarization antenna (41) is a linear polarization antenna having a 45-degree inclination, and receives both the V-polarization component and the H-polarization component.

The received signal from the V-polarized antenna (31) passes through a polarization converter (33), an amplifier (34), a bandpass filter (35) and a local oscillator (36) as in the first embodiment. The baseband signal (10 ') is synchronously detected by the synchronous detection circuit (37) which receives the local oscillation signal from the input. The baseband signal (10 ') is input to a baseband signal processor (40).

[0053] On the other hand, the received signal from the 45-degree polarization antenna (41) is converted in polarization by the polarization converter (33) and then amplified by the amplifier (34) to be filtered by the bandpass filter (35). Pass.

Further, in this embodiment, since the V polarization component and the H polarization component are already mixed and input, they are multiplied by the square detection circuit (42), and the low-pass filter (39) is added. Then, the clock signal (11 ') is reproduced.

[0055] The clock signal (11 ') is also input to the baseband signal processing device (40), and the information signal can be demodulated as in the first embodiment.

As a receiver according to the present invention, in addition to the configuration using a synchronous detection circuit as in the first and second embodiments, a third embodiment as shown in FIG. 5 and a fourth embodiment as shown in FIG. To delay detection Periodic detection can also be used.

That is, a delay detection circuit is provided instead of the synchronous detection circuit (37) shown in FIG. 3 and the local oscillator (36) input thereto, and a baseband signal is obtained by delay detection.

According to the present configuration, it is possible to prevent frequency offset due to synchronous detection and signal quality deterioration due to phase noise. Therefore, in addition to the advantage that the frequency stability is high, the cost of the receiver can be suppressed because the RF band local oscillator is not used.

Further, the configuration shown in FIG. 6 uses a linearly polarized antenna (41) having a 45-degree inclination similarly to the configuration shown in FIG. 4, and mixes V-polarized and H-polarized components to input. By doing so, this is detected by the square-law detection circuit (42), while the received signal from the V-polarized antenna (31) obtains a baseband signal by differential detection.

This configuration can also achieve the same effects as the third embodiment.

Example 2

In the first embodiment of the present invention, the case where the BPSK modulation method is used has been described. However, as disclosed in claims 8 and 19 of the present invention, a quadrature phase shift keying (QPSK: Quadrature) is used. Phase Shift Keying), multi-level quadrature amplitude modulation (QAM: Quadrature Amplitude)

Modulation) method.

[0060] For example, in the QPSK system, the data signal has four phases,

In the same configuration as the transmitter (20) shown in FIG. 2, the baseband signal processing device (22) generates a data signal (60) from the information signal (21).

Then, as a second embodiment of the present invention, the baseband signal processing device (22) generates a complementary signal (61) from which a clock signal is obtained when multiplied with the data signal (10). The generation can be realized at high speed and simply by simple signal processing.

That is, when the phase of the data signal (60) does not change (70), the phase of the complementary signal (61) shifts by π from the phase of the data signal (60). If the phase of the data signal (60) changes by π (71), do not change the phase of the complementary signal (61).

When the phase of the data signal (60) is advanced by π / 2 or delayed by π / 2, and the phase of the data signal (60) and the phase of the complementary signal (61) are the same in the previous symbol At (72), the phase of the data signal (60) is shifted by π. Conversely, the data signal (60 ) If the phase of the complementary signal (61) is opposite to the phase of the complementary signal (61), the phase is the same as the phase of the data signal (60).

[0062] The data signal (60) and the auxiliary signal (61) generated in this way can easily obtain a clock signal (62) by a multiplying process in a receiver.

Further, even in the case of using the QAM method as in the configuration according to claims 9 and 20, the transmitter transmits data so that a clock signal (62) having a constant amplitude as shown in the signal diagram of FIG. 7 can be obtained. It is possible to perform control to give an amplitude to the complementary signal (a wireless modulation signal modulated by the complementary signal) so that the amplitude becomes constant when multiplied with the signal (60). This process is performed in conjunction with the process of determining the amplitude of the data signal (60) in the baseband signal processing device (22). This configuration is extremely effective as a method for easily obtaining a clock signal having a constant amplitude.

In addition, when the QAM method is used as in the configuration according to claims 10 and 21, nonlinearity due to the amplifier of the transmission circuit often causes signal deterioration, but the transmitter outputs the signal. By adopting a configuration in which the amplitude of a complementary signal (a radio-modulated signal modulated by the complementary signal) is controlled and transmitted beforehand so that the signal envelope is constant, the effect can be reduced.

Example 3

According to the third embodiment of the present invention, in addition to the configuration of the second embodiment, the complementary signal is not used only for the purpose of clock recovery, and is also used for synchronous detection of the signal as described in claim 6. Suggest to do.

Therefore, as shown in the signal diagram of FIG. 8, when the same data signal (80) as the signal diagram of FIG. 7 is generated, the phase of the complementary signal (81) is changed by π for each symbol T (83). Or, shift it regularly like π / 2.

This configuration is a technology that has advanced the configuration proposed by the present inventors in Patent Document 1 to transmit an unmodulated carrier with the other polarization component, and a complementary signal whose conventional proposal is always cos cot Is shifted by cos ωt and −cos ωt.

In the implementation of this configuration, the transmitter is the same as the configuration shown in FIG. 2, and the receiver is configured as shown in FIG. The same components as those in FIG. 3 are denoted by the same reference numerals.

First, the antennas (31) and (32) that receive only the respective polarization directions use the V polarization and H Receive the polarization component.

The received signal is unified into equal polarization components by the polarization converter (33), and then amplified by the amplifiers (34) and (34), respectively, and passes through the bandpass filters (35) and (35).

The received signal from the V-polarized antenna (31) is split after the band pass filter (35), one is to the mixer (90) that detects the I component of the baseband signal, and the other is to the Q of the baseband signal. The component is input to a mixer (91) that detects the component.

The complementary signal (radio modulated signal modulated by the complementary signal) from the H-polarized antenna (32) is branched into three systems, one is to the mixer (90) that detects the I component of the baseband signal, and the other is to the One is that the phase of the signal is shifted by π / 2 by the phase shifter (92) and then input to the mixer (91) that detects the Q component of the baseband signal.

[0068] The above signal processing corresponds to quadrature detection, and the frequency stability and phase noise characteristics of both V-polarized and Η-polarized signals are completely correlated (see Patent Document 1 above). By quadrature detecting the data signal with the signal, it is possible to obtain a baseband signal of the I component and the Q component, which is free from the frequency stability and the phase noise characteristic of the wireless carrier.

[0069] However, the polarity of the complementary signal is inverted for each symbol, so that the demodulated IQ signal also has its polarity inverted for each symbol. In order to obtain correct demodulated data, the baseband signal processing device (demodulation circuit) (93) performs signal processing, and at the same time, the absolute phase cannot be determined. You can also send a signal.

The last branch of the branched complementary signal is subjected to delay detection (94) at the symbol rate Τ, so that the clock signal is recovered.

The baseband signal (I) (98), baseband signal (Q) (99), and clock signal (100) are reproduced through the low-pass filter (95) (96) (97), and the baseband signal processing device Input to (93), the information signal is demodulated.

Example 4

According to the present invention, in addition to signal processing as shown in the above-described embodiments 13 to 13, for example, multiplication processing, a transmitter and a receiver are provided with an arithmetic unit (arithmetic processor) to achieve the same effect. You can also. Book Configurations according to claims 3, 4, 14, and 15 of the invention will be described.

FIG. 10 shows a signal diagram in the fourth embodiment, FIG. 11 shows a configuration of a transmitter, and FIG. 12 shows a configuration of a receiver.

In the present embodiment, an exclusive OR (ExOR) is given as an example of the logical operation, but any logical operation can be used.

Then, in FIG. 11, when the information signal (120) is input to the baseband signal processing device (121), a data signal (110) is generated by a predetermined digital modulation method. that time

When an exclusive OR with the data signal is calculated, a complementary signal (111) is generated which generates a clock signal or a frequency-divided signal of a clock which can be easily generated.

The arithmetic processing unit required for this configuration is provided in the baseband signal processing device (121), and can be implemented by using a known simple arithmetic processing unit.

In the calculation of the exclusive OR, as shown in FIG. 10, when the value of the data signal (110) changes, the value of the complementary signal (111) is maintained, and conversely, the value of the data signal (110) is maintained. In this case, the value of the complementary signal (111) is changed.

On the other hand, the receiver receives signals from the V-polarized component antenna (130) and the H-polarized component antenna (131) via the amplifiers (132) and (132) via the envelope detection circuit (133). Detect at (133).

The detection signal from the V polarization is demodulated to an information signal (137) using a clock signal.

[0075] The clock signal is required by the operation processing unit (135) of the baseband signal processing device (demodulation circuit) (134) by the exclusive OR of the detection signal from the V polarization and the detection signal from the H polarization. A half cycle of the clock can be reproduced.

Further, the clock signal is reproduced by combining the delay circuit (136) and is used for demodulation in the demodulation circuit (134).

Example 5

[0076] The present invention is to transmit a second wireless modulation signal modulated by a complementary signal together with a first wireless modulation signal modulated by transmission information by orthogonal polarization components. Under the environment, it is not always necessary to continue to transmit the complementary signal with the second wireless modulation signal after the clock signal synchronized with the information symbol is obtained on the receiver side. Claim 11 and 22 are technologies relating to the configuration.

[0077] That is, in the transmitter (20 ') shown in Fig. 14 having substantially the same configuration as the transmitter (20) shown in Fig. 2, the second information signal (21') to be transmitted is input, and A second data signal is generated from the second information signal by the band signal processing device (22).

After transmitting the complementary signal in the header area for establishing synchronization, for example, a flag bit indicating that transmission of the information signal is started also in the second wireless modulation signal is transmitted in the first wireless modulation signal. I do.

FIG. 13 is a signal diagram of the first wireless modulation signal and the second wireless modulation signal. In the synchronization-establishment header section (170) in FIG. And a complementary signal are sent out so that the clock signal can be reproduced from the product of these signals. Then, after transmitting a predetermined flag bit (172) in the data signal, a second information signal is transmitted instead of the complementary signal, and two-channel signal transmission (171) is performed. Note that the flag bit (172) is extremely short in the drawing for the sake of convenience of explanation. Actually, it needs to be different from normal data bits, and needs to be a longer bit string. The invention according to the fifth embodiment is different from the receiver (30 ′) in FIG. 15 in which the mode of the receiver in FIG. 3 is partially changed, in the signal in the first polarization direction and the second polarization direction orthogonal to the first polarization direction. , And the product is multiplied by a mixer (38), and the output is input to a clock recovery circuit (190). Here, in the header area of the burst signal, since the input signal is already a clock signal, a stable clock reproduction output can be obtained instantaneously.

Next, the receiver demodulates the first wireless signal using the output of the clock recovery circuit (190), and detects a flag bit in the second wireless signal that indicates that information transmission will start. Thereafter, the second wireless signal is also demodulated using the output of the clock recovery circuit (190) to obtain a second information signal.

The present invention can take various aspects as in the above-described embodiments 115. The signal processing of the embodiment 13 and the logical operation of the embodiment 4 can be arbitrarily changed and used.

[0081] Further, the configuration of a device suitable for carrying out the present invention will be additionally described below.

As described in the fourth embodiment, for example, even when the received signals of the V polarization and the H polarization are multiplied by the BPSK modulation of the first embodiment, a complementary signal that can obtain a required 1Z2 frequency-divided signal of the clock signal is obtained. Is transmitted with H polarization.

As described above, even when a frequency-divided signal is obtained instead of a clock signal, a clock signal required for actual demodulation can be reproduced by a simple receiving circuit.

FIG. 16 shows a signal diagram of a 1/2 frequency-divided signal and a necessary clock signal, and FIG. 17 shows a configuration example of a circuit for obtaining a required clock signal from the frequency-divided signal of the same clock. That is, when a 1/2 frequency-divided signal (140) of a clock, which is a bipolar signal, is input, the signal is first converted to a general binary digital signal from the bipolar signal (_1, 1) by a baseband conversion circuit (141). Is converted to (0, 1). Next, this output is branched into two, one of which is delayed by T / 2 in a delay circuit (142) and then input to an exclusive OR or OR circuit (143).

The other clock signal is input to the exclusive OR or OR circuit (143) to generate a necessary clock as shown in FIG. 16 as an output. Generally, these processes are generally performed by a digital processing circuit.

FIG. 18 is an example of an antenna according to an embodiment of the present invention that transmits and receives V polarization and H polarization.

In this antenna (150), two independent signals to be transmitted with orthogonal polarization from two independent feeding terminals (151) and (152) are fed to one circular waveguide antenna (153) and By performing inter-synthesis, two orthogonally polarized signals can be transmitted and received by substantially one antenna.

That is, a feed strip line sheet (156) on which two feed terminals (151), (152), and power strip lines (154), (155) are formed, is provided behind the circular waveguide antenna (153). The reflection plate (157) is stuck immediately after that.

[0086] The strip lines are wired closely at an angle of 90 ° so that signals are supplied in the horizontal and vertical directions at the feeding point of the antenna (153), and the lines are formed up to the intersection. .

[0087] According to this configuration, it is possible to easily adjust the orientation between the antennas as compared with a case where antennas are separately used for the V polarization and the Η polarization, which also contributes to a reduction in the cost of the antenna. .

Further, the present invention is applied to a case where right-handed polarization and left-handed polarization are used instead of V-polarization and Η-polarization. In this case, as shown in Fig. 19, each of the two feed terminals (160) and (161) is branched on the way, and one strip line is electrically connected to the antenna when the feed direction to the antenna is 0, π / 2. In the former, the feed signal is designed so that the phase advances by π / 2, and the other strip line is arranged so that the feed direction is π, 3πΖ2, and at the same time, the feed signal is shifted by π Ζ2 It is designed to delay the phase.

With this configuration, right-handed polarization and left-handed polarization can be transmitted and received by one antenna.

Claims

The scope of the claims

[1] A wireless communication method for transmitting transmission information digitally modulated using a predetermined digital modulation method between a transmitter and a receiver,

A clock signal is transmitted from the transmitter by transmitting a first wireless modulation signal modulated with the transmission information in a first polarization direction and performing predetermined signal processing with the first wireless modulation signal. Alternatively, a frequency-divided signal of a clock whose generation is easy is modulated with a complementary signal

While transmitting the second radio modulated signal in a second polarization direction orthogonal to the first polarization direction,

In the receiver, a clock signal is reproduced by the signal processing of the first wireless modulation signal and the second wireless modulation signal, and the first wireless modulation signal that has been synchronously detected or asynchronously detected is processed by the receiver. Demodulate using clock signal

A wireless communication method, comprising:

[2] The predetermined signal processing is multiplication processing, and in the receiver, a product component clock signal of the first wireless modulation signal and the second wireless modulation signal or a clock signal is easily generated. Regenerate clock divided signal

The wireless communication method according to claim 1.

[3] A wireless communication method for transmitting transmission information digitally modulated using a predetermined digital modulation method between a transmitter and a receiver,

The transmitter transmits a first wireless modulation signal modulated with the transmission information in a first polarization direction, and performs a predetermined logical operation on the transmission information to generate a clock signal or its generation. While transmitting a second wireless modulation signal modulated with a complementary signal that generates any of the frequency-divided signals of the easy clock in a second polarization direction orthogonal to the first polarization direction,

The receiver reproduces a clock signal by the logical operation of the detection output obtained from the first wireless modulation signal and the detection output obtained from the second wireless modulation signal, and performs synchronous detection or asynchronous detection. Demodulating the detected first wireless modulation signal using the clock signal

A wireless communication method, comprising:

[4] The predetermined logical operation is an exclusive logical sum, and the clock signal is reproduced from the exclusive logical sum of the radio modulation signal and the complementary signal in the receiver.

The wireless communication method according to claim 3.

[5] A wireless communication method for communicating transmission information digitally modulated using a predetermined digital modulation method between a transmitter and a receiver,

The transmitter transmits a radio modulation signal of the transmission information in a first polarization direction and a second signal modulated by a clock signal or a complementary signal which is a frequency-divided signal that facilitates generation of a clock signal. While transmitting the wireless modulated signal in a second polarization direction orthogonal to the first polarization direction,

The receiver reproduces a clock signal by detecting the second wireless modulation signal, and demodulates the transmission information using the clock signal of the first wireless modulation signal that is synchronously detected or asynchronously detected.

A wireless communication method, comprising:

[6] In the wireless communication method,

The transmitter sequentially shifts the phase of the second radio modulation signal by π / n (n is an integer) at a transmission symbol clock equal to the first radio modulation signal, and transmits; Only the middle even number is shifted by π / n (n is an integer) and transmitted, and the receiver reproduces the clock signal from the second wireless modulation signal, and the phase is regularly shifted for each symbol. The first wireless modulation signal is synchronously detected and demodulated using the second wireless modulation signal.

The wireless communication method according to claim 1.

7. The wireless communication method according to claim 1, wherein the digital modulation scheme is a binary phase shift keying scheme (BPSK scheme) or a multi-level phase shift keying scheme (M-array PSK scheme).

8. The wireless communication method according to claim 1, wherein the digital modulation method is a multi-level quadrature amplitude modulation method (QAM method).

[9] When using the multi-level quadrature amplitude modulation method (QAM method),

The transmitter controls the amplitude of the second wireless modulation signal in advance so that the amplitude becomes constant when the clock signal is reproduced in the receiver, and transmits the clock signal. The wireless communication method according to claim 8.

[10] When the multi-level quadrature amplitude modulation method (QAM method) is used,

Transmitting the signal by controlling the amplitude of the second radio modulation signal in advance so that the envelope of the signal output from the transmitter is constant.

The wireless communication method according to claim 8.

[11] In the wireless communication method, the transmitter includes:

After transmitting a complementary signal for reproducing the clock signal on the receiver side by the second wireless modulation signal,

Generating a second wireless modulation signal modulated with second transmission information different from the transmission information used for modulating the first wireless modulation signal;

Transmit in a second polarization direction orthogonal to the first polarization direction

The wireless communication method according to claim 1.

[12] A wireless communication system including a transmitter and a receiver for communicating transmission information digitally modulated using a predetermined digital modulation scheme,

A first wireless modulation signal modulated with the transmission information is transmitted in a first polarization direction, and a clock signal or a clock signal that can be easily generated by performing predetermined signal processing with the first wireless modulation signal. A complementary signal for generating any one of the divided signals is generated in a complementary signal generation unit, and a second wireless modulation signal modulated by the complementary signal is generated by the first polarization direction. A transmitter capable of transmitting in a second orthogonal polarization direction;

The signal processing unit performs the signal processing of the first wireless modulation signal and the second wireless modulation signal in a signal processing unit to reproduce a clock signal, and performs the synchronous detection or the asynchronous detection of the first wireless modulation signal by a detection circuit. And a receiver capable of demodulating in a demodulation circuit using the clock signal.

A wireless communication system comprising:

[13] The predetermined signal processing is multiplication processing, and in the receiver, a product signal power of the first radio modulation signal and the second radio modulation signal or a clock signal is easily generated. Regenerate clock divided signal

13. The wireless communication system according to claim 12.

[14] A wireless communication system including a transmitter and a receiver for communicating transmission information digitally modulated using a predetermined digital modulation scheme,

A first wireless modulation signal modulated with the transmission information is transmitted in a first polarization direction, and a predetermined logical operation is performed on the first wireless modulation signal to generate a clock signal or a clock signal that can be easily generated. A complementary signal for generating any one of the divided signals is generated in a complementary signal generation unit, and a second wireless modulation signal modulated by the complementary signal is generated by the first polarization direction. A transmitter capable of transmitting in a second orthogonal polarization direction;

The logical operation of the detection output obtained from the first wireless modulation signal and the detection output obtained from the second wireless modulation signal is performed by an arithmetic unit to reproduce a clock signal, and the detection circuit performs synchronous detection or A receiver capable of demodulating the first wirelessly modulated signal detected asynchronously by the demodulation circuit using the clock signal;

A wireless communication system comprising:

[15] The predetermined logical operation is an exclusive OR, and the receiver outputs a detection output obtained from the first radio modulation signal and a detection output obtained from the second radio modulation signal. Regenerate clock signal from other OR

15. The wireless communication system according to claim 14.

[16] A wireless communication system including a transmitter and a receiver for communicating transmission information digitally modulated using a predetermined digital modulation scheme,

A first wireless modulation signal modulated with the transmission information is transmitted in a first polarization direction, and a second signal modulated with a clock signal or a complementary signal that is a frequency-divided signal that facilitates generation of a clock signal is transmitted. A transmitter capable of transmitting the wirelessly modulated signal in a second polarization direction orthogonal to the first polarization direction;

A receiver capable of demodulating the transmission information in a demodulation circuit using the clock signal by reproducing the clock signal by detecting the second radio modulation signal and using the clock signal to perform synchronous detection or asynchronous detection. When

A wireless communication system comprising:

[17] The transmitter sequentially shifts the phase of the second radio modulation signal by πZn (n is an integer) by a transmission symbol clock equal to the first radio modulation signal, and transmits the signal. Only the even-numbered transmission symbols are shifted by π / n (n is an integer) and transmitted, and the receiver reproduces a clock signal from the second radio modulation signal, and the phase is regularly arranged for each symbol. Synchronous detection and demodulation of the first wireless modulation signal using the shifted second wireless modulation signal

17. The wireless communication system according to claim 12.

18. The wireless communication system according to claim 12, wherein the digital modulation method is a binary phase shift keying method (BPSK method) or a multi-level phase shift keying method (M-array PSK method).

19. The wireless communication system according to claim 12, wherein the digital modulation system is a multi-level quadrature amplitude modulation system (QAM system).

[20] When using the multi-level quadrature amplitude modulation method (QAM method),

The wireless communication system according to claim 19, wherein the transmitter controls the amplitude of the second wireless modulation signal in advance so that the amplitude becomes constant when the clock signal is reproduced in the receiver, and transmits the clock signal. .

[21] When the multi-level quadrature amplitude modulation method (QAM method) is used,

The wireless communication system according to claim 19.

[22] In the wireless communication system, the transmitter is:

22. The wireless communication system according to claim 12, wherein: