JPH09148939A - Radio communication equipment for high-speed transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the radio communication equipment which more improves the communication quality according as transmitting voice or data at a higher speed and consequently transmits voice or data at a higher speed with the same communication quality as conventional and reduces the degradation of demodulation information regardless of waveform distortion due to fading or the like in comparison with conventional. SOLUTION: One Walsh sequence is selected for each combination of transmission data DT of plural bits by a selector, and the modulated signal is received by an antenna 5R and is converted to two base band signals I and Q orthogonally demodulated by an orthogonal demodulation part 7. These base band signals I and Q are multiplied in a multiplier 9 by all of the same Walsh sequence as a transmission system (1) in parallel, and outputs of this multiplier 9 pass integral discharge filters 10 and have amplitudes subjected to maximum likelihood discrimination by a maximum likelihood discrimination part 13. Since the integral discharge filter output corresponding to the transmitted Walsh sequence is maximum in this case, the combination of data for the Walsh sequence corresponding to this output is serially converted after selection, and demodulated data DR is reproduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-speed transmission wireless communication device for high-speed transmission of voice or data.

[0002]

2. Description of the Related Art As a conventional high-speed transmission wireless communication device,
There is a QPSK (four-phase PSK) system shown in "Basics of Mobile Communication Technology" (published by Nikkan Kogyo Shimbun), and FIG. 11 shows a block diagram of the configuration.

In FIG. 11, the transmission system (T) is a 2-bit serial / parallel converter 28, a π / 2 phase shifter 29, a local oscillator.
It is composed of 30, an adder 33, a transmitting unit 4, an antenna unit 5T and a multiplier 9. The receiving system (R) is composed of an antenna 5R, a receiving section 6, a quadrature demodulating section 7, a judging section 31, and a 2-bit parallel / serial converting section 32.

The operation of the conventional high-speed transmission wireless communication device configured as described above will be described.

In the transmission system (T), in order to reduce the modulation rate to half the bit rate, the data DT to be transmitted is converted by the 2-bit serial / parallel converter 28 into an information data series of 2 bits. Then, these signals are multiplied by the in-phase output of the local oscillator 30 and the quadrature output of the π / 2 phase shifter 29 in the two multipliers 9, and their outputs are added.
Composed at 33. Then, it is placed on a high-frequency carrier wave by the transmitter 4 and transmitted from the antenna 5T.

By this operation, the time length of the transmission data DT is doubled and the modulation speed is reduced by half. That is, data can be transmitted at twice the speed when compared at the same modulation speed.

In the reception system (R), the incoming signal is received by the antenna 5R, and the high frequency signal received by the antenna 5R is converted into an intermediate frequency signal in the receiving section 6. Then, the quadrature demodulation unit 7 converts the intermediate frequency signal into two orthogonal baseband signals I and Q. Then, the baseband signal I and the baseband signal Q are detected by the determination unit 31, respectively, and the 2-bit parallel / serial conversion unit 32 converts the parallel data to serial data and outputs the demodulated data DR.

[0008]

However, in the above-mentioned conventional wireless communication device for high-speed transmission, the signal energy and the threshold value for identifying the signal energy are different from those in the normal communication method (two-phase PSK). The difference, that is, the inter-signal distance is half (4 phase PSK is ± π / 2 for the phase amount, but 4
The phase PSK, or QPSK, is ± π / 4. ), The demodulation accuracy deteriorates by 3 dB with respect to the two-phase PSK.

That is, in general, the signal distance of T-phase PSK (T ≧ 4) is 1 / log ₂ T with respect to two-phase PSK, and the demodulation accuracy deteriorates as the speed increases (that is, as T increases). Had a point.

Further, in the above-mentioned conventional radio communication device for high speed transmission, since the demodulated data is judged instantaneously,
When waveform distortion occurs due to fading on the transmission path, the demodulation accuracy is greatly deteriorated.

It is an object of the present invention to solve the above problems and to provide a high-speed transmission wireless communication device capable of transmitting voice or data at a higher speed, the higher the speed and the higher the demodulation accuracy. .

[0012]

In order to achieve the above object, the present invention provides a wireless communication device for high speed transmission according to claim 1, wherein a Walsh sequence which is a binary orthogonal sequence is used in a transmission system.

[0013]

[Outside 12]

Individually prepared, one Walsh sequence is assigned to each combination of (M ≧ 2) -bit transmission data, and this is selected and transmitted. In the receiving system, the quadrature demodulated two-phase signal is multiplied by the same Walsh sequence as in the transmitting system, and after passing through N sets of integral discharge filters in parallel, the amplitude thereof is maximized. judge. Then, the combination of the data for the Walsh sequence corresponding to the maximum integral discharge filter output is selected and serially converted into demodulated data.

In the wireless communication device for high-speed transmission according to claim 2 of the present invention, in the transmission system, M sequence (maximum period sequence)
To

[0016]

[Outside 13]

Individually prepared, one M sequence is assigned to each combination of (M ≧ 2) -bit transmission data, and this is selected and transmitted. In the receiving system, the quadrature demodulated two-phase signal is multiplied by the same M sequence as in the transmitting system, and after passing through N sets of integral discharge filters in parallel, the amplitude thereof is maximum likelihood. judge. Then, the combination of the data for the M series corresponding to the maximum integral discharge filter output is selected and serially converted into demodulated data.

In the wireless communication device for high-speed transmission according to claim 3 of the present invention, in the transmission system, M sequence (maximum period sequence)
To

[0019]

[Outside 14]

Individually prepared M sequences are assigned to each combination of (M ≧ 2) -bit transmission data, which is selected and transmitted. In the receiving system, the quadrature demodulated two-phase signal is multiplied by the same M sequence as in the transmitting system, and after passing through N sets of integral discharge filters in parallel, the amplitude thereof is maximum likelihood. judge. At this time, cross-correlation components between different M sequences are removed and determination is performed. Then, the combination of the data for the M series corresponding to the maximum integral discharge filter output is selected and serially converted into demodulated data.

In the radio communication device for high-speed transmission according to claim 4 of the present invention, in the transmission system, a Wa orthogonal binary sequence is used.
lsh series

[0022]

[Outside 15]

Individually prepared, one Walsh sequence is allocated for each combination of (M ≧ 2) -bit transmission data, and this is selected and T-phase PSK modulated and transmitted. In the receiving system, first, the T-phase PSK demodulated signal is multiplied by the same Walsh sequence as in the transmitting system, passed through N sets of integral discharge filters in parallel, and the amplitude thereof is maximized. judge.
And the Wals corresponding to the maximum integral discharge filter output
The data combination for the h-sequence is selected and serial-converted to obtain demodulated data.

In the radio communication device for high-speed transmission according to claim 5 of the present invention, in the transmission system, a Wa orthogonal sequence is used.
lsh series

[0025]

[Outside 16]

Individually prepared, one Walsh sequence is assigned to each combination of (M ≧ 2) -bit transmission data, selected, and T-value FSK modulated and transmitted. In the receiving system, first, the T-value FSK demodulated signal is multiplied by the same Walsh sequence as in the transmitting system, and after passing through N sets of integral discharge filters in parallel, the amplitude is maximum likelihood. judge.
And the Wals corresponding to the maximum integral discharge filter output
The data combination for the h-sequence is selected and serial-converted to obtain demodulated data.

In the wireless communication device for high-speed transmission according to claim 6 of the present invention, in the transmission system, a Wa orthogonal sequence is used.
lsh series

[0028]

[Outside 17]

Individually prepared, one Walsh sequence is assigned for each combination of (M ≧ 2) -bit transmission data, and this is selected and subjected to M-ary spread spectrum modulation and transmitted. In the receiving system, first, the M-ary spread spectrum demodulated signal is multiplied by the same Walsh sequence as in the transmitting system, and 2
After passing through N sets of integral discharge filters in parallel, one set of each set is subjected to maximum likelihood determination of its amplitude. Then, the combination of the data for the Walsh sequence corresponding to the maximum integral discharge filter output is selected and serially converted into demodulated data.

In the wireless communication device for high-speed transmission according to claim 7 of the present invention, in the transmission system, a Wa orthogonal sequence is used.
lsh series

[0031]

[Outside 18]

Individual pieces are prepared, one Walsh sequence is assigned to each combination of (M ≧ 2) -bit transmission data, and this is selected and transmitted. In the receiving system, the quadrature demodulated two-phase signal is passed through N matched filters, one set of which has the same Walsh sequence as the transmission system as a gain coefficient, in parallel, and then the amplitude thereof is maximized. Likelihood judgment. Then, the combination of data for the Walsh sequence corresponding to the maximum matched filter output is selected and serial-converted to obtain demodulated data.

In the wireless communication device for high-speed transmission according to claim 8 of the present invention, in the transmission system, a Wa orthogonal binary sequence is used.
lsh series

[0034]

[Outside 19]

Individually prepared, one Walsh sequence is assigned to each combination of (M ≧ 2) -bit transmission data, and this is selected and transmitted. In the reception system, after passing through the N demodulated two-phase signals in parallel, N sets of two correlators each having the same Walsh sequence as the weighting coefficient in the transmission system are set,
The maximum likelihood of the amplitude is determined. Then, the combination of data for the Walsh sequence corresponding to the maximum correlator output is selected and serially converted into demodulated data.

In the wireless communication device for high speed transmission according to claim 9 of the present invention, in the transmission system, a Wa orthogonal binary sequence is used.
lsh series

[0037]

[Outside 20]

Individually prepared, one Walsh sequence is assigned to each combination of (M ≧ 2) -bit transmission data, and this is selected and transmitted. In the receiving system, the amplitude of the two-phase signals subjected to quadrature demodulation is passed through N sets of convolvers, one set of which is the same Walsh sequence as that of the transmitting system, in parallel and the maximum likelihood is calculated. judge. Then, the combination of data for the Walsh sequence corresponding to the maximum convolver output is selected and serially converted into demodulated data.

In the radio communication device for high-speed transmission according to claim 10 of the present invention, in the transmission system, a Wa orthogonal sequence is used.
lsh series

[0040]

[Outside 21]

Individually prepared, one Walsh sequence is assigned to each combination of (M ≧ 2) -bit transmission data, and this is selected and transmitted. In the receiving system, the orthogonal demodulated two-phase signal is multiplied by the same Walsh sequence 2 to N as in the transmitting system,
While passing two (N-1) sets of integral discharge filters in parallel, one set has two sets with the gain coefficient for the same Walsh sequence as the transmission system. The matched filters of are passed in parallel and their amplitudes are subjected to maximum likelihood judgment. Then, the data combination for the Walsh sequence corresponding to the maximum integral discharge filter output or matched filter output is selected and serially converted into demodulated data.

According to the present invention, in each means of the high-speed transmission wireless communication device according to claims 1 to 10, the higher the speed, the more the demodulation accuracy is improved.

Further, from claims 1 to 3 and 6 of the present invention
In each means of each wireless communication device for high speed transmission described in 10, deterioration of demodulation accuracy is made smaller than before even if there is waveform distortion due to fading on the transmission path.

[0044]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 to 10.

(Embodiment 1) FIG. 1 is a block diagram showing the configuration of a high-speed transmission wireless communication apparatus according to Embodiment 1 of the present invention. In FIG. 1, in the transmission system (T), 1 is a serial / parallel conversion unit that converts a transmission data sequence for each M bits, and 2 is an M-bit transmission data DT that is converted in parallel by the serial / parallel conversion unit 1. Each combination is associated with one Walsh sequence, which is a binary orthogonal sequence, and the corresponding multiple

[0046]

[Outside 22]

The transmission system Walsh sequence generator 3 for generating the Walsh sequence 3 is a selector 4 for selecting one Walsh sequence corresponding to the combination of the transmission data DT converted in parallel by the serial / parallel converter 1 The selector 3
A transmitter 5T for transmitting the Walsh sequence selected in step 1 by placing it on a high frequency carrier wave is an antenna for transmission.

In the receiving system (R), 5R is a receiving antenna, 6 is a receiving section for converting a high frequency signal sent from the transmitting system (T) into an intermediate frequency signal, and 7 is a receiving section from the receiving section 6. An orthogonal demodulation unit for converting the intermediate frequency signal into two-phase baseband signals I and Q which are orthogonal to each other.

[0049]

[Outside 23]

A receiving system Walsh sequence generator for performing a multiplication process in each of the Walsh sequences in parallel by the multiplier 9, and 10 for integrating and discharging the multiplication output from the multiplier 9 for each Walsh sequence. , N sets of integral discharge filters, 11 an amplitude extractor for extracting the amplitude component of the received signal from the output of each integral discharge filter 10 for the two-phase baseband signals I and Q, and 12 the amplitude A sequence synchronization unit that supplies a clock synchronized with the output of the extraction unit 11 to a maximum likelihood determination unit 13, which will be described later, and the maximum likelihood determination unit 13 described above is one of the amplitude components of the received signal extracted by the amplitude extraction unit 11. To select a data sequence for the Walsh sequence corresponding to the integral discharge filter 10 having the maximum amplitude. Reference numeral 14 is a demodulated data D obtained by converting the data sequence selected by the maximum likelihood determination unit 13 into a serial data string.
It is an M-bit parallel / serial conversion unit that outputs R.

The operation of the high-speed transmission wireless communication layer device configured as described above will be described.

In the transmission system (T), in order to reduce the modulation rate to 1 / M (M ≧ 2) of the bit rate, the data DT to be transmitted is transmitted by the M-bit serial / parallel conversion unit 1 to the transmission data series M bits. To 1 symbol. in this case

[0053]

[Outside 24]

There are different symbols, but for each of these symbols, a Walsh sequence which is N binary orthogonal sequences having two polarities of in-phase and anti-phase (that is, 2 × N when the polarities are taken into consideration). Walsh sequences) are generated in the transmission system Walsh sequence generator 2. Then, from the Walsh sequence, the in-phase or anti-phase Walsh sequence in which the symbols generated in the M-bit serial / parallel conversion unit 1 are made to correspond in advance one-to-one with the selector 3 is selected and output to the transmission unit 4. In the transmission unit 4, the output of the selector 3 is placed on a high frequency carrier wave and is transmitted to the air by a transmission antenna 5T.

In the receiving system (R), the incoming signal is received by the receiving antenna 5R, the high frequency signal received by the antenna 5R in the receiving section 6 is converted into an intermediate frequency signal, and the quadrature demodulating section 7 receives it. The intermediate frequency signal is converted into two orthogonal baseband signals I and Q. Then, the Walsh sequence generated by the receiving system Walsh sequence generator 8 that generates the same Walsh sequence as the transmitting system (T)
Baseband signal I and baseband signal Q in parallel
Is multiplied by the multiplier 9. At this time, the baseband signal I and the baseband signal Q are respectively branched into N sets in parallel, each combination of the baseband signal I and the baseband signal Q is multiplied by the same Walsh sequence, and the N sets of the branched sets are branched. Each combination of the baseband signal I and the baseband signal Q is multiplied by a different Walsh sequence. Then, the multiplied outputs are input to the N sets of integral discharge filters 10 each including two sets, and the amplitude components (that is, the integral discharge filters 10 of the respective integral discharge filters 10 are output from the outputs of the two integral discharge filters 10 of each set. The square root of the sum of squares of the output) is extracted by the amplitude extraction unit 11.

Then, in the maximum likelihood determination unit 13, the sequence synchronization unit
Based on the output timing of the amplitude component extracted in 12, the maximum of the amplitude level of each integral discharge filter 10 is extracted, the polarity is determined, and the symbol corresponding to the series is output. . In this case, if the amplitude level of the integral discharge filter 10 corresponding to the Walsh sequence 1 is maximum and its polarities are in phase, the transmission system (T) outputs a symbol corresponding to the in-phase sequence of the Walsh sequence 1. Then, the M-bit transmission data series corresponding to the symbol is serially demodulated by the M-bit parallel / serial conversion unit 14 into the demodulation data D.
Output as R.

In this case, as the Walsh sequence length M increases, the speed increases, but due to the orthogonality of the Walsh sequence, which is a binary orthogonal sequence, the maximum amplitude output of the integral discharge filter and the other outputs at the time of maximum likelihood determination. The difference (distance between signals) also increases,
The demodulation accuracy is further improved. In addition, the integration effect of the integral discharge filter also makes it resistant to waveform distortion.

(Second Embodiment) FIG. 2 is a block diagram showing the configuration of a high-speed transmission wireless communication apparatus according to the second embodiment of the present invention. 2, blocks having the same functions as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. Here, 15 of the transmission system (T) associates one M sequence (maximum period sequence) with each combination of the M-bit transmission data DT converted in parallel by the serial / parallel conversion unit 1 and associates them with each other. Multiple

[0059]

[Outside 25]

The transmitting system M sequence generator for generating the M sequence of 16 and the receiving system (R) 16 are the same as those of the transmitting system (T) for two-phase baseband signals I and Q.

[0061]

[Outside 26]

This is a receiving-system M-sequence generation unit for performing multiplication processing on the multiplier 9 in parallel with each of the M-sequences of.

The operation of the high-speed transmission wireless communication device configured as described above will be described.

In the transmission system (T), in order to reduce the modulation rate to 1 / M (M ≧ 2) of the bit rate, the information data to be transmitted is transmitted by the M-bit serial / parallel conversion unit 1 in the transmission data series M bits. To 1 symbol. in this case

[0065]

[Outside 27]

There are a number of symbols, but for each of these symbols, there are N M-sequences having two polarities of in-phase and anti-phase (that is, 2 × N M-sequences when the polarities are taken into consideration).
Sequence) is generated by the transmission system M sequence generator 15. And M
From the sequence output, the selector 3 selects an in-phase or anti-phase M sequence that is made to correspond in advance to the symbols generated by the M-bit serial / parallel conversion unit 1 in a one-to-one manner, and the transmission unit 4
Output to In the transmission unit 4, the output of the selector 3 is placed on a high frequency carrier wave and is transmitted to the air by a transmission antenna 5T.

In the receiving system (R), the incoming signal is received by the receiving antenna 5R, the high frequency signal received by the antenna 5R in the receiving section 6 is converted into an intermediate frequency signal, and the quadrature demodulating section 7 receives it. The intermediate frequency signal is converted into two orthogonal baseband signals I and Q. Then, the M sequence generated by the reception system M sequence generation unit 16 that generates the same M sequence as that of the transmission system (T) is parallel to the baseband signal I and the baseband signal Q by the multiplier 9
Get on at. At this time, the baseband signal I and the baseband signal Q are respectively branched into N sets in parallel, each combination of the baseband signal I and the baseband signal Q is multiplied by the same M sequence, and the N sets of the branched sets are branched. Different M sequences are put on the combinations of the baseband signal I and the baseband signal Q, respectively. Then, the multiplied outputs are input to the N sets of integral discharge filters 10 each including two sets, and the amplitude components (that is, the integral discharge filters 10 of the respective integral discharge filters 10 are output from the outputs of the two integral discharge filters 10 of each set. Output 2
The square root of the sum of multiplications) is extracted by the amplitude extraction unit 11.

Then, the maximum likelihood determination unit 13 extracts the maximum amplitude level of the integral discharge filters 10 based on the output timing of the amplitude component extracted by the sequence synchronization unit 12, The polarity is determined and the symbol corresponding to the sequence is output. In this case, if the amplitude level of the integral discharge filter 10 corresponding to the M sequence 1 is maximum and the polarities are in phase, the symbol corresponding to the in-phase sequence of the M sequence 1 is output in the transmission system (T). Then, the M-bit transmission data sequence corresponding to the symbol is serially output as demodulation data DR by the M-bit parallel / serial conversion unit 14.

In this case, the larger the M-sequence length M, the higher the speed. However, when the sequence length is sufficiently large, the M-sequence also has a characteristic sufficiently close to orthogonality, so that the maximum value of the integral discharge filter at the time of maximum likelihood determination is obtained. Difference between amplitude output and other outputs
(Distance between signals) is also increased, and demodulation accuracy is further improved. In addition, the integration effect of the integral discharge filter also makes it resistant to waveform distortion.

(Third Embodiment) FIG. 3 is a block diagram showing the configuration of a high-speed transmission wireless communication apparatus according to a third embodiment of the present invention. 3, the blocks having the same functions as those in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted. Here, 17 of the receiving system (R) is used in the maximum likelihood determination by the maximum likelihood determination unit 13,
It is a cross-correlation compensator for removing cross-correlation components between different M sequences.

The operation of the high-speed transmission wireless communication device configured as described above will be described. However, the operation of the transmission system (T) is the same as that in the second embodiment (FIG. 2), and the description thereof will be omitted. Receiving system
In (R), the operation is the same as that of the second embodiment until the amplitude extracting unit 11 extracts the amplitude component, but the different operation is as follows.

In the maximum likelihood determining section 13, the maximum one of the amplitude levels of each integral discharge filter 10 is extracted based on the output timing of the amplitude component extracted by the sequence synchronizing section 12, and the polarity thereof is determined. Judgment is made, and the symbol corresponding to the sequence is output. At this time, since the M sequence is not a perfect orthogonal sequence, the cross-correlation component between different M sequences can be a factor of erroneous determination of maximum likelihood determination. Different M for likelihood judgment
The cross-correlation compensating unit 17 removes cross-correlation components between sequences. In this case, if the amplitude level of the integral discharge filter 10 corresponding to the M sequence 1 is maximum and the polarities are in phase, the symbol corresponding to the in-phase sequence of the M sequence 1 is output in the transmission system (T). Then, the M-bit transmission data sequence corresponding to the symbol is serially output as demodulation data DR by the M-bit parallel / serial conversion unit 14.

In this case, the larger the M sequence length M, the higher the speed. However, by removing the cross-correlation component between different M sequences during maximum likelihood determination, the maximum amplitude output of the integral discharge filter during maximum likelihood determination and its The output difference (distance between signals) other than is also large, and the demodulation accuracy is further improved. In addition, the integration effect of the integral discharge filter also makes it resistant to waveform distortion.

(Embodiment 4) FIG. 4 is a block diagram showing the structure of a high-speed transmission wireless communication apparatus according to Embodiment 4 of the present invention. 4, blocks having the same functions as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. Here, 18 of the transmission system (T) is the T-phase PSK for the output of the selector 3.
A T-phase PSK modulator for performing modulation, and a receiving system (R) 19 is a T-phase PSK demodulator for performing T-phase PSK demodulation before multiplying the Walsh sequence from the receiving system Walsh sequence generator 8 in the multiplier 9. .

The operation of the high-speed transmission wireless communication device configured as described above will be described. The operation up to the selector 3 in the transmission system (T) is the same as that in the first embodiment (FIG. 1). The different operations are as follows.

The selector 3 selects an in-phase or anti-phase Walsh sequence which is made to correspond in advance to the symbols generated by the M-bit serial / parallel converter 1 in a one-to-one manner, and the T-phase PSK modulator 18 selects the T-phase PSK. After modulation, the transmitter 4
Output to In the transmission unit 4, the output of the selector 3 is placed on a high frequency carrier wave and is transmitted to the air by a transmission antenna 5T.

In the receiving system (R), an incoming signal is received by the receiving antenna 5R, the high frequency signal received by the antenna 5R in the receiving section 6 is converted into an intermediate frequency signal, and the T phase PSK demodulating section is provided. At 19, the output of the selector 3 in the transmission system is reproduced. The subsequent operation is the first embodiment.
The description is omitted because it is the same as (FIG. 1).

In this case, the larger the Walsh sequence length, the faster the speed. However, due to the orthogonality of the Walsh sequence which is a binary orthogonal sequence, the difference between the maximum amplitude output of the integral discharge filter and the other outputs (at the maximum likelihood determination) ( The distance between signals) is also increased, and the demodulation accuracy is further improved.

(Fifth Embodiment) FIG. 5 is a block diagram showing the configuration of a high-speed transmission wireless communication device according to a fifth embodiment of the present invention. 5, blocks having the same functions as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. Here, 20 of the transmission system (T) is the T value F with respect to the output of the selector 3.
The T-value FSK modulator for performing SK modulation, and the receiving system (R) 21 is a T-value FSK demodulator for performing T-value FSK demodulation before multiplying the Walsh sequence from the receiving system Walsh sequence generator 8 in the multiplier 9. is there.

The operation of the high-speed transmission wireless communication device configured as described above will be described. The operation up to the selector 3 in the transmission system (T) is the same as in the above-described embodiment (FIG. 1). The different operations are as follows.

The selector 3 selects an in-phase or anti-phase Walsh sequence which is made to correspond in advance to the symbol generated in the M-bit serial / parallel converter 1 in a one-to-one manner, and the T-value FSK modulator 20 selects the T-value FSK. After modulation, the transmitter 4
Output to In the transmission unit 4, the output of the selector 3 is placed on a high frequency carrier wave and is transmitted to the air by a transmission antenna 5T.

In the receiving system (R), the incoming signal is received by the receiving antenna 5R, the high frequency signal received by the antenna 5R in the receiving section 6 is converted into an intermediate frequency signal, and the T-value FSK demodulating section. At 21, the output of the selector 3 in the transmission system is reproduced.

Since the subsequent operation is the same as that of the first embodiment (FIG. 1), its explanation is omitted.

In this case, as the Walsh sequence length M increases, the speed increases, but due to the orthogonality of the Walsh sequence, which is a binary orthogonal sequence, the maximum amplitude output of the integral discharge filter and the other outputs at the time of maximum likelihood determination. The difference (distance between signals) also increases,
The demodulation accuracy is further improved.

(Sixth Embodiment) FIG. 6 is a block diagram showing the structure of a high-speed transmission wireless communication device according to a sixth embodiment of the present invention. 6, blocks having the same functions as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. Here, 22 of the transmission system (T) is M-ar with respect to the output of the selector 3.
y The M-ary spread spectrum modulation unit for performing spread spectrum modulation and the reception system (R) 23 performs M-ary spread spectrum demodulation before multiplying the Walsh sequence from the reception system Walsh sequence generation unit 8 by the multiplier 9. It is an M-ary spread spectrum demodulation unit.

The operation of the high-speed transmission wireless communication device configured as described above will be described. The operation up to the selector 3 in the transmission system (T) is the same as in the above-described embodiment (FIG. 1). The different operations are as follows.

The selector 3 selects an in-phase or anti-phase Walsh sequence which is made to correspond in advance to the symbols generated by the M-bit serial / parallel converter 1 in a one-to-one manner, and M-a
After being subjected to M-ary spread spectrum modulation by the ry spread spectrum modulation section 22, it is output to the transmission section 4. In the transmission unit 4, the output of the selector 3 is placed on a high frequency carrier wave and is transmitted to the air by a transmission antenna 5T.

In the receiving system (R), the incoming signal is received by the receiving antenna 5R, the high frequency signal received by the antenna 5R in the receiving unit 6 is converted into an intermediate frequency signal, and the M-ary spectrum spread is performed. The demodulator 23 reproduces the output of the selector 3 in the transmission system.

Since the subsequent operation is the same as that of the first embodiment (FIG. 1), its explanation is omitted.

In this case, as the Walsh sequence length M increases, the speed increases, but due to the orthogonality of the Walsh sequence, which is a binary orthogonal sequence, the maximum amplitude output of the integral discharge filter and the other outputs at the time of maximum likelihood determination. The difference (distance between signals) also increases,
The demodulation accuracy is further improved. Also, the waveform distortion becomes strong due to the integration effect at the time of spread spectrum demodulation.

(Embodiment 7) FIG. 7 is a block diagram showing the configuration of a high-speed transmission wireless communication apparatus according to Embodiment 7 of the present invention. 7, blocks having the same functions as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. Here, 24 of the receiving system (R) is the same as that of the transmitting system (T) for the two-phase baseband signals I and Q converted by the orthogonal demodulation unit 7.

[0092]

[Outside 28]

These are N sets of matched filters each having two gain coefficients of the Walsh sequence as a set.

The operation of the high-speed transmission wireless communication device configured as described above will be described. The transmission system (T) and the reception system
The operation up to the (R) quadrature demodulation unit 7 is almost the same as that of the first embodiment (FIG. 1), and therefore its explanation is omitted.

The quadrature demodulator 7 converts the intermediate frequency signal converted by the receiver 6 into a two-phase baseband signal I and a baseband signal Q which are orthogonal to each other. At this time, the baseband signal I and the baseband signal Q are branched into N sets in parallel and are input to the N sets of matched filters 24, and the outputs of the two matched filters 24 of each set. The amplitude component (that is, the square root of the sum of squares of each matched filter output) is extracted by the amplitude extraction unit 11. In this case, the gain coefficient of each matched filter 24 is the same N kinds of Walsh sequences as in the transmission system (T), the same Walsh sequence is used for each of the two matched filters 24 in each set, and the same Walsh sequence is used for each of the matched filters 24 of different sets. Different Walsh sequences are used as gain factors.

Then, the maximum likelihood determination unit 13 extracts the maximum amplitude level of each matched filter 24 based on the output timing of the amplitude component extracted by the sequence synchronization unit 12, and determines its polarity. Is determined and the symbol corresponding to the sequence is output. In this case, if the amplitude level of the matched filter 24 corresponding to the Walsh sequence 1 is maximum and its polarities are in phase, the transmission system (T) outputs the symbol corresponding to the in-phase sequence of the Walsh sequence 1. Then, the M-bit transmission data sequence corresponding to the symbol is serially demodulated by the M-bit parallel / serial conversion unit 14 into the demodulated data DR.
Is output as

In this case, as the Walsh sequence length M increases, the speed increases, but due to the orthogonality of the Walsh sequence, which is a binary orthogonal sequence, the difference between the maximum amplitude output of the matched filter and the other outputs at the time of maximum likelihood determination. (Distance between signals) also increases,
The demodulation accuracy is further improved. In addition, the integrated effect of the matched filter also makes it resistant to waveform distortion.

(Embodiment 8) FIG. 8 is a block diagram showing the structure of a high-speed transmission wireless communication device according to Embodiment 8 of the present invention. 8, blocks having the same functions as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. Here, 25 of the receiving system (R) is the same as that of the transmitting system (T) with respect to the two-phase baseband signals I and Q converted by the orthogonal demodulation unit 7.

[0099]

[Outside 29]

These are N sets of correlators, one set of which is the weighting coefficient of each Walsh sequence.

The operation of the high-speed transmission wireless communication device configured as described above will be described. The transmission system (T) and the reception system
The operation up to the (R) quadrature demodulation unit 7 is almost the same as that of the first embodiment (FIG. 1), and therefore its explanation is omitted.

The quadrature demodulator 7 converts the intermediate frequency signal converted by the receiver 6 into a two-phase baseband signal I and a baseband signal Q which are orthogonal to each other. At this time, the baseband signal I and the baseband signal Q are branched into N sets in parallel and are input to the N sets of correlators 25 each including two sets, and the outputs of the two correlators 25 of each set are output. The amplitude component (that is, the square root of the sum of squares of each correlator output) is extracted by the amplitude extraction unit 11. In this case, the weighting coefficient of each correlator 25 is the same N types of Walsh sequences as in the transmission system (T), and the same Walsh sequence is used for each of the two correlators 25 in each set, and the correlator 2 of a different set is used.
In 5, different Walsh sequences are used as weighting factors.

Then, the maximum likelihood determination unit 13 extracts the maximum amplitude level of the correlators 25 based on the output timing of the amplitude component extracted by the sequence synchronization unit 12, and determines its polarity. Is determined and the symbol corresponding to the sequence is output. In this case, if the amplitude level of the correlator 25 corresponding to the Walsh sequence 1 is maximum and its polarities are in-phase, the symbol corresponding to the in-phase sequence of the Walsh sequence 1 is output in the transmission system (T). Then, the M-bit transmission data sequence corresponding to the symbol is converted into an M-bit parallel / serial conversion unit.
14 serially outputs the demodulated data DR.

In this case, as the Walsh sequence length M increases, the speed increases, but due to the orthogonality of the Walsh sequence, which is a binary orthogonal sequence, the difference between the maximum amplitude output of the correlator and the other outputs at the time of maximum likelihood determination. (Distance between signals) is also increased, and demodulation accuracy is further improved. In addition, the integration effect of the correlator also makes it stronger against waveform distortion.

(Ninth Embodiment) FIG. 9 is a block diagram showing the structure of a high-speed transmission wireless communication device according to a ninth embodiment of the present invention. 9, blocks having the same functions as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. Here, 26 of the receiving system (R) is the same as that of the transmitting system (T) with respect to the two-phase baseband signals I and Q converted by the orthogonal demodulation unit 7.

[0106]

[Outside 30]

There are N sets of convolvers, each of which is a reference sequence of the Walsh sequence of.

The operation of the high-speed transmission wireless communication device configured as described above will be described. The transmission system (T) and the reception system
The operation up to the (R) quadrature demodulation unit 7 is the same as that in the first embodiment (FIG. 1), and therefore its explanation is omitted.

In the quadrature demodulation unit 7, the intermediate frequency signal converted by the reception unit 6 is converted into two orthogonal baseband signals I and Q. At this time, the baseband signal I and the baseband signal Q are branched into N sets in parallel and are input to the N sets of convolvers 26, each of which includes two sets of two convolvers 26, and the amplitudes thereof are output. The component (that is, the square root of the sum of squares of each convolver output) is extracted by the amplitude extraction unit 11. In this case, the reference sequence of each convolver 26 is the same N kinds of Walsh sequences as the transmission system (T), the same Walsh sequence is used for the two convolvers 26 in each set, and different Walsh sequences are used for the different convolvers 26. Is the reference sequence.

Then, the maximum likelihood determination unit 13 extracts the maximum amplitude level of each convolver 26 based on the output timing of the amplitude component extracted by the sequence synchronization unit 12, and determines its polarity. It is determined and the symbol corresponding to the sequence is output.

In this case, if the amplitude level of the convolver 26 corresponding to the Walsh sequence 1 is maximum and its polarities are in phase, the symbol corresponding to the in-phase sequence of the Walsh sequence 1 is output in the transmission system (T). Then, the M-bit transmission data series corresponding to the symbol is serially output as demodulation data DR by the M-bit parallel / serial conversion unit 14.

In this case, as the Walsh sequence length M increases, the speed increases, but due to the orthogonality of the Walsh sequence, which is a binary orthogonal sequence, the difference between the maximum amplitude output of the convolver and the other outputs (at the maximum likelihood determination) ( The distance between signals) is also increased, and the demodulation accuracy is further improved. In addition, the integration effect of the convolver makes it stronger against waveform distortion.

(Embodiment 10) FIG. 10 shows an embodiment of the present invention.
FIG. 11 is a block diagram showing a configuration of a high-speed transmission wireless communication device in 10. 10, the blocks having the same functions as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. Here, 27 of the receiving system (R) is a plurality of Walsh sequences 2 to N which are the same as those of the transmitting system (T) with respect to the two-phase baseband signals I and Q converted by the orthogonal demodulation unit 7. It is a receiving system Walsh sequence generator B for performing a multiplication process by a multiplier 9 in parallel.

The operation of the high-speed transmission wireless communication device configured as described above will be described. The transmission system (T) and the reception system
The operation up to the (R) quadrature demodulation unit 7 is the same as that in the first embodiment (FIG. 1), and therefore its explanation is omitted.

In the quadrature demodulator 7, the intermediate frequency signal converted by the receiver 6 is converted into a two-phase baseband signal I and a baseband signal Q which are orthogonal to each other. At this time, the baseband signal I and the baseband signal Q are branched in parallel into N sets, and the transmission system generated by the reception system Walsh sequence generator B27 together with the N sets of matched filters 24 of which two are one set.
After multiplying the same Walsh sequence 2 to N as (T) by the multiplier 9, (N
-1) It is input to the set of integral discharge filters 10, and the amplitude components (that is, the sum of squares of the outputs of the matched filter and the integral discharge filters) from the outputs of the two matched filters 24 and the integral discharge filters 10 of each set. Is the square root of
More extracted. In this case, the gain coefficient of the matched filter 24 is the same Walsh sequence 1 as in the transmission system (T).

Then, in the maximum likelihood judging section 13, based on the amplitude output timing of the matched filter 24 extracted by the sequence synchronizing section 12, the maximum of the amplitude levels of the matched filter 24 and each integral discharge filter 10 is obtained. An object is extracted, its polarity is determined, and a symbol corresponding to the sequence is output. In this case, if the amplitude level of the matched filter 24 corresponding to the Walsh sequence 1 is maximum and its polarities are in phase, the transmission system (T) outputs the symbol corresponding to the in-phase sequence of the Walsh sequence 1. Then, the M-bit transmission data sequence corresponding to the symbol is serially output as demodulation data DR by the M-bit parallel / serial conversion unit 14.

In this case, as the Walsh sequence length M increases, the speed increases, but due to the orthogonality of the Walsh sequence, which is a binary orthogonal sequence, the difference between the maximum amplitude output of the matched filter and the other outputs at the time of maximum likelihood determination. (Distance between signals) also increases,
The demodulation accuracy is further improved. In addition, the waveform distortion becomes strong due to the integration effect of the matched filter and the integral discharge filter.

Furthermore, the device scale of the integral discharge filter is smaller than that of the matched filter, while the synchronized filter has a shorter synchronization time than that of the integral discharge filter.
Compared with, it is possible to shorten the sequence synchronization time without causing a large increase in the device scale.

[0119]

As described above, the high-speed transmission wireless communication device of the present invention allocates and modulates one Walsh sequence for each combination of transmission data of a plurality of bits in the transmission system, and orthogonally in the reception system. The demodulated orthogonal two-phase baseband signals are all multiplied by the same Walsh sequence as in the transmission system in parallel, and the output is passed through an integral discharge filter, etc., and then the maximum likelihood is determined to determine the maximum amplitude. To obtain a wireless communication device for high-speed transmission in which the communication quality is improved as the voice or data is transmitted at a higher speed by selecting the combination of data corresponding to the integrated discharge filter etc. You can

Furthermore, due to the integration effect of the received signal, it is possible to obtain a high-speed transmission wireless communication apparatus in which the demodulation accuracy is less deteriorated than in the past even if there is waveform distortion due to fading in the transmission path.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a high-speed transmission wireless communication device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a high-speed transmission wireless communication device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a high-speed transmission wireless communication device according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a high-speed transmission wireless communication device according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a high-speed transmission wireless communication device according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a high-speed transmission wireless communication device according to a sixth embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a high-speed transmission wireless communication device according to a seventh embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a high-speed transmission wireless communication device according to an eighth embodiment of the present invention.

FIG. 9 is a block diagram showing the configuration of a high-speed transmission wireless communication device according to a ninth embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration of a high-speed transmission wireless communication device according to a tenth embodiment of the present invention.

FIG. 11 is a block diagram showing a configuration of a conventional high-speed transmission wireless communication device.

[Explanation of symbols]

1 ... M-bit serial / parallel converter, 2 ... Transmission system
Walsh sequence generator, 3 ... selector, 4 ... transmitter,
5T ... transmitting antenna, 5R ... receiving antenna,
6 ... Receiving unit, 7 ... Quadrature demodulating unit, 8 ... Receiving system Walsh
Sequence generator, 9 ... Multiplier, 10 ... Integral discharge filter,
11 ... Amplitude extraction unit, 12 ... Sequence synchronization unit, 13 ... Maximum likelihood determination unit, 14 ... M-bit parallel / serial conversion unit, 15 ...
Transmitting system M sequence generator, 16 ... Receiving system M sequence generator, 17
... Cross-correlation compensation unit, 18 ... T-phase PSK modulation unit, 19 ... T
Phase PSK demodulator, 20 ... T-value FSK modulator, 21 ... T-value FSK demodulator, 22 ... M-ary spread spectrum modulator, 23 ... M-ary spread spectrum demodulator, 24 ... Matched filter, 25 ... Correlator , 26… Convolver,
27 ... Receiving system Walsh sequence generator B.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Ryuzo Nishi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (10)

[Claims] 1. A serial / parallel conversion unit for converting a transmission data sequence into parallel every M bits, and a Walsh which is one binary orthogonal signal sequence for each combination of the M-bit transmission data converted into parallel. Corresponding series,
The corresponding multiple [External 1] , A selector for selecting one Walsh sequence corresponding to the combination of the parallel-converted transmission data, and a Walsh sequence selected by the selector as a high-frequency carrier wave. A transmission system composed of a transmission unit for carrying and transmitting, and a reception unit for converting a high frequency signal sent from the transmission system into an intermediate frequency signal,
A quadrature demodulation unit for converting the intermediate frequency signal into a two-phase baseband signal orthogonal to each other, and a plurality of the same two-phase baseband signals as those of the transmission system. Reception Walsh sequence generators and multipliers for performing multiplication processing in parallel with each of the Walsh sequences, and N sets of two sets that perform integration and discharge of the multiplication process output for each Walsh sequence period. Integrated discharge filter, an amplitude extractor for extracting the amplitude component of the received signal from the output of each integrated discharge filter for the two-phase baseband signals, and the integrated discharge having the maximum amplitude from the amplitude components of the received signal. A maximum likelihood determination unit that selects a data sequence for a Walsh sequence corresponding to a filter, a sequence synchronization unit that supplies a clock synchronized with the output of the amplitude extraction unit to the maximum likelihood determination unit, and the maximum likelihood determination unit. A wireless communication device for high-speed transmission, comprising: a reception system including a parallel / serial conversion unit that converts a selected data sequence into a serial data string and outputs demodulated data. 2. A serial / parallel conversion unit for converting a transmission data sequence into parallel every M bits, and one M sequence (maximum period sequence) for each combination of the M-bit transmission data converted into the parallel. Correspondence and the corresponding plurals [External 3] Of the transmission system M sequence generator, a selector for selecting one M sequence corresponding to the combination of the transmission data converted in parallel, and the M sequence selected by the selector as a high-frequency carrier. A transmission system including a transmission unit that carries and transmits the signal, a reception unit that converts a high-frequency signal sent from the transmission system into an intermediate frequency signal, and a quadrature that converts the intermediate frequency signal into two orthogonal baseband signals For the demodulation unit and the two-phase baseband signals, a plurality of the same as the transmission system Receiving system M for performing multiplication processing in parallel on each of the M sequences of
A sequence generator and a multiplier, N sets of integral discharge filters each of which integrates and discharges the multiplication processing output for every M sequence period, and respective integral discharges for the two-phase baseband signals. An amplitude extraction unit that extracts the amplitude component of the received signal from the output of the filter, and a maximum likelihood determination unit that selects a data sequence for the M sequence corresponding to the integral discharge filter of the maximum amplitude from the amplitude components of the received signal, A sequence synchronization unit that supplies a clock synchronized with the output of the amplitude extraction unit to the maximum likelihood determination unit, and a data sequence selected by the maximum likelihood determination unit is converted into a serial data string and demodulated data is output. A wireless communication device for high-speed transmission, comprising: a reception system including a parallel / serial conversion unit. 3. The high-speed transmission wireless communication device according to claim 2, further comprising a cross-correlation compensating unit for removing a cross-correlation component between different M sequences in the maximum likelihood determination. 4. The T-phase PSK modulator that performs T-phase PSK modulation on the selector output in the transmission system, and the T-phase PSK before multiplying by the Walsh sequence in the reception system.
The high-speed transmission wireless communication device according to claim 1, further comprising a T-phase PSK demodulation unit that performs demodulation. 5. The T-value FSK modulator that performs T-value FSK modulation on the selector output in the transmission system, and the T-value FSK before multiplication by the Walsh sequence in the reception system.
The high-speed transmission wireless communication device according to claim 1, further comprising a T-value FSK demodulation unit that performs demodulation. 6. The M-ary spread spectrum modulation unit that performs M-ary spread spectrum modulation on the selector output in the transmission system, and the Walsh spread spectrum modulation unit in the reception system.
The wireless communication device for high-speed transmission according to claim 1, further comprising an M-ary spread spectrum demodulation unit that performs M-ary spread spectrum demodulation before multiplying the sequence. 7. A Walsh sequence is associated with each combination of a serial / parallel conversion unit that converts a transmission data sequence into parallel for every M bits, and each combination of the M-bit transmission data that has been converted into parallel, and the correspondence is provided. The plural [outside 5] , A selector for selecting one Walsh sequence corresponding to the combination of the parallel-converted transmission data, and a Walsh sequence selected by the selector as a high-frequency carrier wave. A transmission system composed of a transmission unit for carrying and transmitting, and a reception unit for converting a high frequency signal sent from the transmission system into an intermediate frequency signal,
A quadrature demodulation unit for converting the intermediate frequency signal into a two-phase orthogonal baseband signal, and a plurality of quadrature demodulators identical to those in the transmission system for the two-phase baseband signal. Of N Walsh sequences each having a gain coefficient as one set, and an amplitude extraction unit for extracting the amplitude component of the received signal from the outputs of the matched filters for the two-phase baseband signals. A maximum likelihood determination unit that selects a data sequence for a Walsh sequence corresponding to a matched filter having the maximum amplitude from the amplitude components of the received signal, and a clock that is synchronized with the output of the amplitude extraction unit is the maximum likelihood. It has a sequence synchronization unit supplied to the determination unit, and a reception system including a parallel / serial conversion unit that converts the data sequence selected by the maximum likelihood determination unit into a serial data string and outputs demodulated data. Wireless communication device for high-speed transmission. 8. A Walsh sequence is associated with each combination of a serial / parallel conversion unit for converting the transmission data sequence into parallel for every M bits and each of the M-bit transmission data that has been converted into parallel, and the correspondence is provided. The plural [outside 7] , A selector for selecting one Walsh sequence corresponding to the combination of the parallel-converted transmission data, and a Walsh sequence selected by the selector as a high-frequency carrier wave. A transmission system composed of a transmission unit for carrying and transmitting, and a reception unit for converting a high frequency signal sent from the transmission system into an intermediate frequency signal,
A quadrature demodulation unit for converting the intermediate frequency signal into a two-phase baseband signal orthogonal to each other, and a plurality of the same two-phase baseband signals as those of the transmission system. Of N Walsh sequences each as a weighting coefficient and N sets of 2 sets of correlators, and an amplitude extraction unit for extracting the amplitude component of the received signal from the output of each of the correlators for the two-phase baseband signals. A maximum likelihood determination unit that selects a data sequence for a Walsh sequence corresponding to a correlator having the maximum amplitude from the amplitude components of the received signal, and a clock synchronized with the output of the amplitude extraction unit is the maximum likelihood. It has a sequence synchronization unit supplied to the determination unit, and a reception system including a parallel / serial conversion unit that converts the data sequence selected by the maximum likelihood determination unit into a serial data string and outputs demodulated data. Wireless communication device for high-speed transmission. 9. A Walsh sequence is associated with each combination of a serial / parallel conversion unit that converts a transmission data sequence into parallel for every M bits, and each combination of the M-bit transmission data that has been converted into parallel, and the correspondence is provided. Multiple allowed [Outside 9] , A selector for selecting one Walsh sequence corresponding to the combination of the parallel-converted transmission data, and a Walsh sequence selected by the selector as a high-frequency carrier wave. A transmission system composed of a transmission unit for carrying and transmitting, and a reception unit for converting a high frequency signal sent from the transmission system into an intermediate frequency signal,
A quadrature demodulation unit for converting the intermediate frequency signal into a two-phase baseband signal orthogonal to each other, and a plurality of quadrature demodulators identical to those in the transmission system for the two-phase baseband signal. Of the Walsh sequence generator for generating the Walsh sequence, and N sets of convolvers each including two Walsh sequences from the Walsh sequence generator of the receiving system as a reference sequence, and the two-phase base An amplitude extraction unit that extracts the amplitude component of the received signal from the output of each convolver for the band signal, and a maximum likelihood determination that selects a data sequence for the Walsh sequence corresponding to the convolver of the maximum amplitude from the amplitude components of the received signal. Section, a sequence synchronization section that supplies a clock synchronized with the output of the amplitude extraction section to the maximum likelihood determination section, and a demodulated data obtained by converting the data sequence selected by the maximum likelihood determination section into a serial data string. And a reception system including a parallel / serial conversion unit that outputs 10. A serial / parallel conversion unit for converting a transmission data sequence into parallel for every M bits and one Walsh sequence for each combination of the M-bit transmission data converted into parallel, and the correspondence. Multiple [Outside 11] Of the Walsh sequences (1 to N), a selector for selecting one Walsh sequence corresponding to the combination of the parallel-converted transmission data, and a Walsh sequence selected by the selector. And a receiver for converting a high frequency signal sent from the transmitter into an intermediate frequency signal, and a two-phase baseband orthogonal to the intermediate frequency signal. A quadrature demodulation unit for converting into a signal and a plurality of Walsh sequences 2 identical to those in the transmission system for the two-phase baseband signals.
Reception system Walsh for performing multiplication processing in parallel for each of
The sequence generator B and the multiplier, and the output of the multiplication process are Wals
an integral discharge filter that performs integration and discharge for each h-series cycle; a matched filter that uses the same Walsh sequence as the transmission system as a gain coefficient for the two-phase baseband signals;
Received signals from the outputs of (N-1) sets of integral discharge filters each of which has two sets of two-phase baseband signals and one set of a matched filter or an integral discharge filter having two sets of the two sets. An amplitude extraction unit that extracts the amplitude component of
A maximum likelihood determination unit that selects a data sequence for a Walsh sequence corresponding to an integral discharge filter or a matched filter having the maximum amplitude from the amplitude components of the received signal, and is synchronized with the output of the amplitude extraction unit of the matched filter. A sequence synchronization unit that supplies a clock to the maximum likelihood determination unit and a reception system including a parallel / serial conversion unit that converts the data sequence selected by the maximum likelihood determination unit into a serial data string and outputs demodulated data. A wireless communication device for high-speed transmission, comprising: