JP2855170B2 - CDMA demodulation circuit and demodulation method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio receiver used for digital mobile communication and the like, and more particularly, to a CDMA (Coding System) using spread spectrum.
de Division Multiple Access)
The present invention relates to a DMA demodulation circuit and a demodulation method.

2. Description of the Related Art In a CDMA radio apparatus using spread spectrum, a transmitting side transmits a transmission signal that has been subjected to communication modulation as a spread signal in which a signal band is expanded by applying secondary modulation using a spreading code. On the other hand, on the receiving side, a wideband received signal including a large number of spread signals is returned to an original narrowband signal in the process of despreading, and then a normal demodulation process is performed. In the process of despreading, the correlation between the spreading code included in the received signal and the spreading code generated on the receiving side is detected, and using the correlation, only the desired received signal from a large number of signals is detected. Receive selectively. A device that performs this correlation detection is a matched filter. When there is no cross-correlation between the spreading codes, only the auto-correlation of the desired signal is output to the output of the matched filter. However, in general, there is a cross-correlation between spread codes, so that a cross-correlation component of another spread code is mixed in the despread output.

In addition, even for signals of the own channel, cross-correlation exists between signals arriving after multipath propagation. FIG.
Shows the state of cross-correlation in the case of three passes. In order to detect the correlation of the signal of the first path, the correlation is detected by a matched filter using the spreading code as a tap coefficient. At the timing of the correlation detection, the signal of the second path and the signal of the third path, which are spread with the same spreading code as the signal of the first path, are time-shifted, and thus are spread with different spreading codes. It is considered a signal. Therefore, the second pass and the third pass
The signal on the path receives interference due to cross-correlation. In FIG. 1, D (n) indicates the n-th symbol.

A method of minimizing this kind of cross-correlation is disclosed in Yoshida et al., "DS / CDMA Adaptive Interference Canceller Suitable for Mobile Communication Environments" (IEICE Technical Report 93-76 (1993-11)). ing.

FIG. 2 shows the configuration. Orthogonalizing filter 3
Has a tap length of several symbol periods, and operates at a rate m times (m is an integer of 1 or more) the chip rate of the spreading code. The orthogonalization filter 3 receives the spread signal from the input terminal 1, takes out only the own station signal by despreading, and supplies it to the delay detector 7 as a narrow band despread signal. The output of the delay detector 7 is supplied to the identification determination unit 11, and the identification determination data is output from the output terminal 2 as a demodulated output.
The identification determination data is also supplied to an error vector calculation unit 12, and an error between the identification determination data and the output of the delay detector 7 is converted into a linear amount by an error vector / linear amount conversion unit 13. It is supplied to the control unit 14. The tap coefficient control unit 14 adaptively calculates the tap coefficients orthogonalized to the spreading codes of all the other stations, and feeds them back to the orthogonalization filter 3. The adaptive control of the tap coefficient is performed at the symbol period, and the demodulation output is also obtained at the symbol period. Thus, the interference wave component of the other station is removed, and only the signal component of the own station is extracted.

When the orthogonalization filter 3 is applied to a mobile communication environment under Rayleigh fading, adaptive control does not follow fluctuations in the transmission path due to high-speed Rayleigh fading. Therefore, in order to separate the cross-correlation removal function and the fading tracking function in the orthogonalization filter 3, the delay detector 7 is used to improve the tracking characteristic with respect to fading. Therefore, according to the configuration of FIG. 2, a demodulation circuit that can follow high-speed fading can be realized, but its demodulation characteristics depend on the characteristics of differential detection.

By the way, in the differential detection, since the information signal is differentially encoded on the transmitting side and transmitted, an error of one bit on the receiving side results in a two-bit error of the original information. Therefore, the reception error rate characteristic is degraded by 3 dB as compared with the absolute synchronous detection. In CDMA, a signal received from another station is regarded as random noise. Therefore, if the transmission power from another station increases, the subscriber capacity of the system decreases. Therefore, reception Ed / No (energy per bit to noise
If the transmission power from other stations is suppressed using a demodulation method with a high spectral density, the subscriber capacity can be increased accordingly. That is, the system using the absolute synchronous detection can increase the subscriber capacity more than the system using the delay detection.

However, in digital mobile communication, etc., the transfer function of the propagation path greatly fluctuates with time due to the movement of the transceiver of the mobile station.Therefore, in order to obtain the absolute phase of the transmission carrier required for synchronous detection on the receiving side, It is necessary to quickly estimate the transfer function of the propagation path.

As a method of performing synchronous detection by estimating a transfer function of a propagation path at high speed, an interpolation synchronous detection method is known. For example, Seiichi Sampei, "Fading distortion compensation method of 16QAM for land communication", IEICE B-II Vol.J72-B-II PP.7-1
5 January 1989 or its revised edition S. Sampei et.
al, “Rayleigh Fading Compensation for QAM in Land
Mobile Radio Communications ", IEEE Transactions on
Vehicular Technology, VOL. 42, No. 2, MAY 1993.

FIG. 3 shows a configuration example of a signal used in this type of interpolation synchronous detection. The transmitting side periodically inserts a pilot signal P known from the transmitting side and the receiving side into the information signal and transmits the information signal. As the pilot signal P, one or more symbols with known patterns are used. Two consecutive pilot signals P
One frame is composed of the information signal D and the pilot signal P sandwiched between the frames.

FIG. 4 shows a configuration of a conventional receiver. The radio wave received by the antenna 21 is BP to the extent that the
The band is limited by an F (band-pass filter) 22. The band-limited received signal is adjusted to an appropriate level by an AGC (automatic gain control circuit) 23 and an AFC (automatic frequency adjustment circuit) 24
Thus, the offset frequency between the carrier and the local oscillation signal is roughly adjusted. Here, the BPF 22 is inserted to ensure the normal operation of the AGC 23 and the AFC 24.

Next, orthogonal quasi-synchronous detection is performed by the orthogonal quasi-synchronous detection circuit 25 using a local signal from the local oscillator 26 having the same frequency as the carrier of the received signal. Thus, the wideband signal is converted into a narrowband despread signal. The output of the quadrature quasi-synchronous detection circuit 25 is supplied to an interpolation compensator 29 via an LPF (low-pass filter) 27 and an A / D converter 28. The LPF 27 is provided to suppress out-of-band noise and interference from adjacent channels. The interpolation compensator 29 estimates the transfer function of the propagation path for each information symbol by interpolation using the pilot signal, and compensates for each information symbol using the estimated transfer function. The compensated signal is determined by the determination unit 30. Compensating each information symbol with the estimated transfer function enables absolute phase detection. Note that, as the interpolation method, primary interpolation using two pilot signals and secondary interpolation using three pilot signals are generally used.

When the received signal contains noise, as the number of symbols per pilot signal increases, the transfer function can be estimated more accurately, and the transfer function estimation error decreases. In order to estimate each transfer function of an information symbol from the transfer function estimated by the pilot signal, first-order or second-order Gaussian interpolation may be used.

In the above-described conventional device, when the transfer function of the transmission path fluctuates sufficiently slower than the insertion period of the pilot signal, the transfer function of each information symbol can be estimated by simple linear interpolation. As the speed increases, the interpolation error increases. Therefore, the insertion period of the pilot signal must be reduced. However, when the insertion cycle is reduced, the number of symbols of the pilot signal increases, and the transmission efficiency decreases. On the other hand, if the insertion cycle is reduced while keeping the transmission efficiency constant, the number of symbols per pilot signal decreases, and the estimation error of the transfer function increases.

As described above, in the conventional interpolation type synchronous detection, there is a disadvantage that the transmission efficiency is reduced when an attempt is made to deal with a high-speed variation of the transfer function of the propagation path. Further, the interference wave component of another user in the own cell cannot be sufficiently reduced.

DISCLOSURE OF THE INVENTION Accordingly, the present invention provides a CDMA demodulation circuit and a demodulation method to which absolute synchronous detection can be applied as a demodulation method, and which can follow high-speed fading and reduce interference wave components of other users in the own cell. With the goal.

First, according to the present invention, a signal having a frame consisting of a pilot signal of a known pattern and an information signal is spread and spread into a wideband signal with a spreading code faster than each information symbol in the information signal. CDMA (Code Division Multiple Access) that generates signals and performs multiple access transmission
A demodulation circuit used in transmission for demodulating the spread signal using the spread code, the delay circuit sequentially giving a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spread code to the spread signal. A plurality of delay circuits, a plurality of multipliers for multiplying the spread signal and the delayed spread signal by a tap coefficient based on the spread code,
An adder that adds the output of the multiplier, an orthogonalization filter that despreads the spread signal and outputs a despread signal, and a reception pilot signal included in the despread signal,
Comparing with a pilot signal of a known pattern, estimating the reception phase of the reception pilot signal, interpolating the reception phase, and estimating the reception phase of each information symbol in the information signal; Compensating the received phase error of the received pilot signal based on the estimated received phase of the received pilot signal, and compensating the phase error of the information symbol based on the estimated received phase of the information symbol Phase error compensating means, identification determining means for identifying and discriminating the phase compensated pilot signal and the phase compensated information symbol, and an error between an output of the phase error compensating means and an output of the identification judging means. Tap coefficient control means for calculating the tap coefficient for minimizing the mean square error of and supplying the tap coefficient to the orthogonalization filter. A CDMA demodulation circuit characterized by comprising:

The tap coefficient control means calculates the tap coefficient for minimizing the mean square error for each symbol in the pilot signal, and calculates the mean square error for each symbol in the information signal. The tap coefficient to be minimized may be calculated.

The tap coefficient control means may calculate the tap coefficient for minimizing the mean square error for each pilot signal.

The tap coefficient control means calculates, for each pilot signal, the tap coefficient that minimizes the mean square error, and for each symbol in the information signal, minimizes the mean square error. The tap coefficients may be calculated.

Secondly, according to the present invention, the downlink channel from the base station to the mobile station includes at least one pilot channel composed only of a pilot signal having a known pattern, and a plurality of communication channels for transmitting information signals. Spreading the pilot signal and the information signal into a wideband signal with a spreading code faster than the transmission rate to generate a spread signal, and using the spread signal to perform communication between the base station and the mobile station. CDMA using multiple access transmission (Code Divis
a pilot channel demodulation unit for demodulating the pilot channel; a pilot channel demodulation unit for demodulating the pilot channel; and a communication channel provided for each of the communication channels. A pilot channel demodulation unit for sequentially demodulating the pilot signal with a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spreading code. A plurality of delay circuits, a plurality of multipliers for multiplying the pilot channel spread signal and the delayed spread signal by a tap coefficient of the pilot channel based on a spread code of the pilot channel, and an output of the multiplier; An adder that despreads the spread signal of the pilot channel to despread the pilot channel. A pilot channel orthogonalization filter that outputs a signal; a reception pilot signal included in the despread signal of the pilot channel; and a pilot signal of a known pattern, and receiving of each reception pilot symbol in the reception pilot signal. Estimating the phase, a signal obtained by averaging the received phase, a phase error extracting / averaging means for obtaining a phase error between the received pilot symbol, and a signal obtained by averaging the received phase and the received pilot symbol A pilot channel tap coefficient control means for calculating a tap coefficient of the pilot channel for minimizing a mean square error of a phase error and supplying the tap coefficient to the pilot channel orthogonalization filter; A delay of 1 / m (m is an integer of 1 or more) of the code chip period is set in the communication channel. A plurality of delay circuits for sequentially giving the spread signal of the communication channel, a plurality of multipliers for multiplying the communication channel spread signal and the delayed spread signal by a tap coefficient of the communication channel based on a spread code of the communication channel, An adder for adding the output of the multiplier,
A communication channel orthogonalization filter that despreads the spread signal of the communication channel and outputs a despread signal of the communication channel; and a reception phase of each information symbol in the information signal included in the despread signal of the communication channel. A communication channel phase error compensation means for compensating based on the reception phase of the corresponding reception pilot symbol, and a communication channel tap coefficient control means for calculating a tap coefficient of the communication channel and supplying the tap coefficient to the communication channel orthogonalization filter. The demodulation circuit further comprises: identification determining means for identifying and determining the information symbol whose phase has been compensated; the communication channel tap coefficient control means has the information symbol whose phase has been compensated; The tap coefficient for minimizing a mean square error of an error with the information symbol determined and identified is calculated. CDMA demodulation circuit is provided, wherein the door.

Third, according to the present invention, the downlink channel from the base station to the mobile station includes at least one pilot channel composed of only a pilot signal having a known pattern and a plurality of communication channels for transmitting information signals. Spreading the pilot signal and the information signal into a wideband signal with a spreading code faster than the transmission rate to generate a spread signal, and using the spread signal to perform communication between the base station and the mobile station. CDMA using multiple access transmission (Code Divis
a demodulation circuit of a receiving device of the mobile station, used in a transmission system for receiving signals, comprising: a pilot channel demodulation unit for demodulating the pilot channel; and a pilot channel demodulation unit for demodulating the pilot channel. A communication channel demodulation unit for demodulating, wherein the pilot channel demodulation unit sequentially gives a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spreading code to the spreading signal of the pilot channel. , A plurality of multipliers for multiplying the pilot channel spread signal and the delayed spread signal by a tap coefficient of the pilot channel based on the pilot code of the pilot channel, and an output of the multiplier An adder for despreading the spread signal of the pilot channel to despread the pilot channel. A pilot channel matched filter that outputs a signal, a received pilot signal included in the despread signal of the pilot channel, and a pilot signal of a known pattern are compared, and the reception phase of each received pilot symbol in the received pilot signal is compared. A signal obtained by averaging the reception phase, and a phase error extraction and averaging means for obtaining an error between the reception pilot symbol and the communication channel demodulation unit, wherein the communication channel demodulation unit is one of the chip periods of the spreading code. a plurality of delay circuits for sequentially giving a delay of / m (m is an integer of 1 or more) to the spread signal of the communication channel; and a plurality of delay circuits based on the spread code of the communication channel based on the spread signal of the communication channel and the delayed spread signal. A plurality of multipliers for multiplying the tap coefficient of the communication channel, and an adder for adding the output of the multiplier,
A communication channel orthogonalization filter that despreads the spread signal of the communication channel and outputs a despread signal of the communication channel; and a reception phase of each information symbol in the information signal included in the despread signal of the communication channel. A communication channel phase error compensation means for compensating based on the reception phase of the corresponding reception pilot symbol, and a communication channel tap coefficient control means for calculating a tap coefficient of the communication channel and supplying the tap coefficient to the communication channel orthogonalization filter. The demodulation circuit further comprises: identification determining means for identifying and determining the information symbol whose phase has been compensated; the communication channel tap coefficient control means has the information symbol whose phase has been compensated; The tap coefficient for minimizing a mean square error of an error with the information symbol determined and identified is calculated. CDMA demodulation circuit is provided, wherein the door.

Fourth, according to the present invention, a signal having a frame composed of a pilot signal of a known pattern and an information signal is spread and spread into a wideband signal with a spreading code faster than each information symbol in the information signal. CDMA (Code Division Multiple Access) that generates signals and performs multiple access transmission
A demodulation circuit for demodulating, using the spreading code, the spread signal used in transmission and propagated through a multipath, wherein for each path, 1 / m (m is 1 or more) of the chip period of the spreading code A plurality of delay circuits for sequentially giving a delay of the spread signal to the spread signal; a plurality of multipliers for multiplying the spread signal and the delayed spread signal by a tap coefficient based on the spread code;
An adder that adds the output of the multiplier, an orthogonalization filter that despreads the spread signal and outputs a despread signal, and a reception pilot signal included in the despread signal,
Comparing with a pilot signal of a known pattern, estimating the reception phase of the reception pilot signal, interpolating the reception phase, and estimating the reception phase of each information symbol in the information signal; Compensating the received phase error of the received pilot signal based on the estimated received phase of the received pilot signal, and compensating the phase error of the information symbol based on the estimated received phase of the information symbol Phase error compensating means, and tap coefficient control means for calculating the tap coefficients and supplying the calculated tap coefficients to the orthogonalization filter, wherein the demodulation circuit further comprises the phase compensated for each path. A RAKE combining circuit for performing RAKE combining by multiplying a pilot signal and the information symbol by a weight coefficient; And a tap coefficient control unit for each path, the output of the phase error compensation unit of each path, and the signal of the output of the identification determination unit with power distributed by the weight coefficient of RAKE combining A CDMA demodulation circuit is provided, which calculates the tap coefficient that minimizes the mean square error of the error.

The weight coefficient may be a reception SIR (signal power to interference power ratio) of each path.

Fifth, according to the present invention, the downlink channel from the base station to the mobile station includes at least one pilot channel composed of only a pilot signal having a known pattern, and a plurality of communication channels for transmitting information signals. Spreading the pilot signal and the information signal into a wideband signal with a spreading code faster than the transmission rate to generate a spread signal, and using the spread signal to perform communication between the base station and the mobile station. CDMA using multiple access transmission (Code Divis
a demodulation circuit used in a transmission system and demodulating the spread signal propagated through a multipath by using the spreading code, wherein a pilot channel for demodulating the pilot channel is provided for each path. A demodulation unit; and a communication channel demodulation unit provided for each of the communication channels for demodulating the communication channel, wherein the pilot channel demodulation unit has 1 / m (m is 1) of a chip period of the spreading code. A plurality of delay circuits for sequentially giving a delay of the above-mentioned integer) to the spread signal of the pilot channel, and a tap coefficient of the pilot channel based on the spread code of the pilot channel for the spread signal of the pilot channel and the delayed spread signal. A plurality of multipliers, and an adder for adding an output of the multiplier, A pilot channel orthogonal filter for despreading the spread signal of the pilot channel and outputting a despread signal of the pilot channel; a received pilot signal included in the despread signal of the pilot channel; and a pilot signal of a known pattern. Comparing, estimating the reception phase of each reception pilot symbol in the reception pilot signal, averaging the reception phase, and a phase error extraction and averaging means for obtaining a phase error between the reception pilot symbol and A pilot channel tap coefficient for calculating a tap coefficient of the pilot channel for minimizing a mean square error of a phase error between the signal obtained by averaging the reception phase and the received pilot symbol, and supplying the tap coefficient to the pilot channel orthogonalization filter Control means, wherein the communication channel demodulation unit is configured to A plurality of delay circuits for sequentially giving a delay of 1 / m (m is an integer of 1 or more) of the chip period of the code to the spread signal of the communication channel, and providing the communication channel spread signal and the delayed spread signal with the communication channel A plurality of multipliers for multiplying the tap coefficient of the communication channel based on the spreading code, and an adder for adding the output of the multiplier,
A communication channel orthogonalization filter that despreads the spread signal of the communication channel and outputs a despread signal of the communication channel; and a reception phase of each information symbol in the information signal included in the despread signal of the communication channel. A communication channel phase error compensation means for compensating based on the reception phase of the corresponding reception pilot symbol, and a communication channel tap coefficient control means for calculating a tap coefficient of the communication channel and supplying the tap coefficient to the communication channel orthogonalization filter. The demodulation circuit further comprises: a RAKE combining circuit that performs a RAKE combining by multiplying the information symbol whose phase has been compensated for each of the paths by a weight coefficient; Means for controlling the communication channel tap coefficient of each path, wherein the communication channel phase error compensation of each path is performed. A CDMA demodulation circuit that calculates the tap coefficient that minimizes the mean square error of the error between the output of the means and the output of the identification determination means and the signal obtained by power distribution with the weight coefficient of the RAKE combination. Provided.

Sixth, according to the present invention, a downlink channel from a base station to a mobile station includes at least one pilot channel composed of only a pilot signal having a known pattern, and a plurality of communication channels for transmitting information signals. Spreading the pilot signal and the information signal into a wideband signal with a spreading code faster than the transmission rate to generate a spread signal, and using the spread signal to perform communication between the base station and the mobile station. CDMA using multiple access transmission (Code Divis
a demodulation circuit used in a transmission system and demodulating the spread signal propagated through a multipath by using the spreading code, wherein a pilot channel for demodulating the pilot channel is provided for each path. A demodulation unit; and a communication channel demodulation unit provided for each of the communication channels for demodulating the communication channel, wherein the pilot channel demodulation unit has 1 / m (m is 1) of a chip period of the spreading code. A plurality of delay circuits for sequentially giving a delay of the above-mentioned integer) to the spread signal of the pilot channel, and a tap coefficient of the pilot channel based on the spread code of the pilot channel for the spread signal of the pilot channel and the delayed spread signal. A plurality of multipliers, and an adder for adding an output of the multiplier, A pilot channel matched filter for despreading the spread signal of the pilot channel and outputting a despread signal of the pilot channel; a received pilot signal included in the despread signal of the pilot channel; and a pilot signal of a known pattern. And a phase error extraction and averaging means for estimating a reception phase of each reception pilot symbol in the reception pilot signal, averaging the reception phase, and obtaining an error between the reception pilot symbol and the reception pilot symbol. A plurality of delay circuits for sequentially giving a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spreading code to a spreading signal of the communication channel, the communication channel demodulating unit, Multiplying the delayed spread signal by a tap coefficient of the communication channel based on a spreading code of the communication channel; A plurality of multipliers, and an adder for adding an output of the multiplier,
A communication channel orthogonalization filter for despreading the spread signal of the communication channel and outputting a despread signal of the communication channel; anda receiving phase of an information symbol in the information signal included in the despread signal of the communication channel. A communication channel phase error compensating means for compensating based on the reception phase of the corresponding received pilot symbol, and a communication channel tap coefficient control means for calculating a tap coefficient of the communication channel and supplying the tap coefficient to the communication channel orthogonalization filter. The demodulation circuit further comprises: a RAKE combining circuit that performs a RAKE combining by multiplying the information symbol whose phase has been compensated for each path by a weight coefficient; And a communication channel tap coefficient control means for each path, wherein the communication channel phase error compensation means for each path is provided. A CDMA demodulation circuit, which calculates the tap coefficient that minimizes the mean square error of the error between the output of the stage and the signal obtained by distributing the output of the discrimination determination means with the weight coefficient of the RAKE combination Provided.

Seventh, according to the present invention, an information signal is spread into a wideband signal with a spreading code faster than its transmission rate to generate a spread signal, and a base station and a mobile station are used by using the spread signal. CDMA (Code Divis
In the transmission system, the downlink channel from the base station to the mobile station includes at least one pilot channel composed of only a pilot signal having a known pattern, and a plurality of communication channels for transmitting the information signal. A CDMA transmission system is provided, comprising:

A period of the spreading code may be the same as an information symbol period in the information signal.

The demodulation circuit of the receiving device of the mobile station, a pilot channel demodulation unit for demodulating the pilot channel, provided for each communication channel, comprising a communication channel demodulation unit for demodulating the communication channel, A plurality of delay circuits for sequentially giving a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spreading code to the spreading signal of the pilot channel; A plurality of multipliers for multiplying the delayed spread signal by a tap coefficient of the pilot channel based on a spreading code of the pilot channel; and an adder for adding an output of the multiplier, the spread signal of the pilot channel Channel orthogonalization filter for despreading and outputting a despread signal of the pilot channel The received pilot signal included in the despread signal of the pilot channel is compared with a pilot signal of a known pattern to estimate the reception phase of each received pilot symbol in the received pilot signal. A phase error extraction and averaging means for obtaining a phase error between the averaged signal and the received pilot symbol; and a mean square error of the phase error between the averaged signal and the received pilot symbol. And a pilot channel tap coefficient control unit for calculating a tap coefficient of the pilot channel to be supplied to the pilot channel orthogonalization filter, wherein the communication channel demodulation unit performs 1 / m (1 / m) of a chip period of the spreading code. a plurality of delay circuits for sequentially giving a delay of (m is an integer of 1 or more) to the spread signal of the communication channel; A plurality of multipliers for multiplying the communication channel spread signal and the delayed spread signal by a tap coefficient of the communication channel based on the spread code of the communication channel, and an adder for adding an output of the multiplier,
A communication channel orthogonalization filter for despreading the spread signal of the communication channel and outputting a despread signal of the communication channel, and a reception phase of each information symbol in the information signal included in the despread signal of the communication channel. Communication channel phase error compensating means for compensating based on the reception phase of the corresponding received pilot symbol, and communication channel tap coefficient control means for calculating a tap coefficient of the communication channel and supplying the tap coefficient to the communication channel orthogonal filter. The demodulation circuit further includes identification determination means for identifying and determining the information symbol whose phase has been compensated, and the communication channel tap coefficient control means has the information symbol whose phase has been compensated and the identification symbol. Calculating the tap coefficient that minimizes the mean square error of the error with the determined information symbol. It may be.

The demodulation circuit of the receiving device of the mobile station includes: a pilot channel demodulation unit for demodulating the pilot channel; and a communication channel demodulation unit provided in each of the communication channels, for demodulating the communication channel. A pilot channel demodulation unit comprising: a plurality of delay circuits for sequentially giving a delay of 1 / m (m is an integer of 1 or more) of the chip period of the spreading code to the spreading signal of the pilot channel; A plurality of multipliers for multiplying the spread signal by a tap coefficient of the pilot channel based on the spreading code of the pilot channel, and an adder for adding an output of the multiplier, the spread signal of the pilot channel Pilot channel matched filter for despreading and outputting a despread signal of the pilot channel The received pilot signal included in the despread signal of the pilot channel is compared with a pilot signal of a known pattern to estimate the reception phase of each received pilot symbol in the received pilot signal. A phase error extraction and averaging means for calculating an error between the averaged signal and the received pilot symbol, wherein the communication channel demodulation unit performs 1 / m (m is 1 or more) of a chip period of the spread code. A plurality of delay circuits for sequentially giving an integer) delay to the spread signal of the communication channel, and multiplying the spread signal of the communication channel and the delayed spread signal by a tap coefficient of the communication channel based on a spread code of the communication channel. A plurality of multipliers, and an adder for adding an output of the multiplier,
A communication channel orthogonalization filter that despreads the spread signal of the communication channel and outputs a despread signal of the communication channel; and a reception phase of each information symbol in the information signal included in the despread signal of the communication channel. A communication channel phase error compensating means for compensating based on the reception phase of the corresponding received pilot symbol, and a communication channel tap coefficient control means for calculating a tap coefficient of the communication channel and supplying the tap coefficient to the communication channel orthogonal filter. The demodulation circuit further comprises: identification determination means for identifying and determining the information symbol whose phase has been compensated; the communication channel tap coefficient control means has the information symbol whose phase has been compensated; The tap coefficient for minimizing the mean square error of an error with the information symbol determined and identified is calculated. It may be.

A demodulation circuit of the receiving device of the mobile station, for each path, a pilot channel demodulation unit for demodulating the pilot channel; and a communication channel demodulation for demodulating the communication channel, provided for each communication channel. A plurality of delay circuits for sequentially giving a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spreading code to the spreading signal of the pilot channel; A plurality of multipliers for multiplying the channel spread signal and the delayed spread signal by a tap coefficient of the pilot channel based on the pilot code of the pilot channel, and an adder for adding an output of the multiplier, A pilot channel directly despreads a pilot channel spread signal and outputs a despread signal of the pilot channel. A crossing filter, a received pilot signal included in the despread signal of the pilot channel, and a pilot signal of a known pattern are compared to estimate the reception phase of each received pilot symbol in the received pilot signal. Phase error extraction and averaging means for obtaining a phase error between a signal obtained by averaging a reception phase and the reception pilot symbol; an average square of a phase error between the signal obtained by averaging the reception phase and the reception pilot symbol A pilot channel tap coefficient control means for calculating a tap coefficient of the pilot channel to minimize an error, and supplying the pilot channel tap coefficient to the pilot channel orthogonalization filter; A plurality of delays for sequentially giving a delay of / m (m is an integer of 1 or more) to the spread signal of the communication channel. A plurality of multipliers for multiplying the communication channel spread signal and the delayed spread signal by a tap coefficient of the communication channel based on a spread code of the communication channel; and an adder for adding an output of the multiplier. With
A communication channel orthogonalization filter that despreads the spread signal of the communication channel and outputs a despread signal of the communication channel; and a reception phase of each information symbol in the information signal included in the despread signal of the communication channel. A communication channel phase error compensation means for compensating based on the reception phase of the corresponding reception pilot symbol, and a communication channel tap coefficient control means for calculating a tap coefficient of the communication channel and supplying the tap coefficient to the communication channel orthogonalization filter. The demodulation circuit further comprises: a combining circuit that performs a RAKE combining by multiplying the pilot signal and the information symbol whose phase has been compensated for each path by a weighting coefficient, and identifies the RAKE-combined signal. And a communication channel tap coefficient control means for each path, wherein the communication channel tap coefficient control means for each path includes The tap coefficient for minimizing the mean square error of the error between the output of the tunneling phase error compensating means and the signal obtained by distributing the output of the discrimination determining means with the weighting coefficient of the RAKE combining may be calculated. .

A demodulation circuit of the receiving device of the mobile station, for each path, a pilot channel demodulation unit for demodulating the pilot channel; and a communication channel demodulation for demodulating the communication channel, provided for each communication channel. A plurality of delay circuits for sequentially giving a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spreading code to the spreading signal of the pilot channel; A plurality of multipliers for multiplying the channel spread signal and the delayed spread signal by a tap coefficient of the pilot channel based on the pilot code of the pilot channel, and an adder for adding an output of the multiplier, A pilot channel map for despreading a spread signal of a pilot channel and outputting a despread signal of the pilot channel. And comparing a received pilot signal included in the despread signal of the pilot channel with a pilot signal of a known pattern to estimate a reception phase of each reception pilot symbol in the reception pilot signal. And a phase error extraction and averaging means for calculating a phase error between the signal obtained by averaging the received pilot symbol and the received pilot symbol, wherein the communication channel demodulation unit performs 1 / m (m is 1 A plurality of delay circuits for sequentially giving a delay of (integer above) to the spread signal of the communication channel; and a tap coefficient of the communication channel based on the spread code of the communication channel, for the communication channel spread signal and the delayed spread signal. A plurality of multipliers for multiplying, and an adder for adding the output of the multiplier,
A communication channel orthogonalization filter for despreading the spread signal of the communication channel and outputting a despread signal of the communication channel, and a reception phase of each information symbol in the information signal included in the despread signal of the communication channel. Communication channel phase error compensating means for compensating based on the reception phase of the corresponding received pilot symbol, and communication channel tap coefficient control means for calculating a tap coefficient of the communication channel and supplying the tap coefficient to the communication channel orthogonal filter. The demodulation circuit further includes a RAKE combining circuit that performs a RAKE combining by multiplying the pilot signal and the information symbol whose phase has been compensated for each path by a weighting coefficient, and identifies and determines the RAKE combined signal. And a communication channel tap coefficient control means for each path, wherein the communication channel tap coefficient control means for each path includes The tap coefficient for minimizing an average square error of an error between an output of the channel phase error compensating means and a signal obtained by distributing the output of the identification determining means with the weight coefficient of the RAKE combining may be calculated. .

Eighth, according to the present invention, a signal having a frame composed of a pilot signal of a known pattern and an information signal is spread and spread into a wideband signal with a spreading code faster than each information symbol in the information signal. CDMA (Code Division Multiple Access) that generates signals and performs multiple access transmission
A demodulation method used in transmission and demodulating the spread signal using the spread code, wherein a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spread code is sequentially applied to the spread signal. Multiplying the spread signal and the delayed spread signal by a tap coefficient based on the spreading code, adding the multiplication result, despreading the spread signal, and outputting a despread signal; A received pilot signal included in the spread signal;
Comparing with a pilot signal of a known pattern, estimating the reception phase of the reception pilot signal, interpolating the reception phase, and estimating the reception phase of each information symbol in the information signal; Compensating the received phase error of the received pilot signal based on the estimated received phase of the received pilot signal, and compensating the phase error of the information symbol based on the estimated received phase of the information symbol A phase error compensating step, a discriminating and judging step for discriminating and discriminating the phase-compensated pilot signal and the phase-compensated information symbol, and an error between an output of the phase error compensating step and an output of the discriminating step. Tap coefficient control step of calculating the tap coefficient to minimize the mean square error of A CDMA demodulation method is provided.

The tap coefficient calculating step calculates a tap coefficient that minimizes the mean square error for each symbol in the pilot signal, and minimizes the mean square error for each symbol in the information signal. May be calculated.

The tap coefficient calculating step may calculate a tap coefficient for minimizing the mean square error for each pilot signal.

The tap coefficient calculating step calculates, for each pilot signal, a tap coefficient that minimizes the mean square error, and for each symbol in the information signal, a tap coefficient that minimizes the mean square error. Ninth, according to the present invention, the downlink channel from the base station to the mobile station transmits at least one pilot channel composed of only a pilot signal of a known pattern and an information signal. A plurality of communication channels to generate a spread signal by spreading the pilot signal and the information signal into a wideband signal with a spreading code faster than its transmission rate, and using the spread signal, the base station and CDMA that performs communication with the mobile station by multiple access transmission
(Code Division Multiple Access) A demodulation method of a receiving device of a mobile station used in a transmission system, wherein a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spreading code is set in the pilot channel. Are sequentially given to the spread signal, multiply the spread signal of the pilot channel and the delayed spread signal by the tap coefficient of the pilot channel based on the spread code of the pilot channel,
Adding the multiplication result, despreading the spread signal of the pilot channel, and outputting a despread signal of the pilot channel; a received pilot signal included in the despread signal of the pilot channel; and a known pattern. The pilot signal of each received pilot symbol in the received pilot signal is estimated, and a phase error between the signal obtained by averaging the received phase and the received pilot symbol is calculated. Averaging step; calculating a tap coefficient of the pilot channel that minimizes a mean square error of a phase error between the received phase-averaged signal and the received pilot symbol; and a chip period of the spreading code. 1 / m (where m is an integer of 1 or more) is sequentially given to the spread signal of the communication channel,
Multiply the communication channel spread signal and the delayed spread signal by a tap coefficient of the communication channel based on the spread code of the communication channel, and add the multiplication result,
Despreading the spread signal of the communication channel and outputting a despread signal of the communication channel, and corresponding a reception phase of each information symbol in the information signal included in the despread signal of the communication channel. A communication phase channel error compensation step for compensating based on the reception phase of the received pilot symbol; an identification decision step for identifying the information symbol whose phase has been compensated; an information symbol compensated for the phase; Calculating the tap coefficient that minimizes the mean square error of the error with the determined information symbol.

Tenth, according to the present invention, a downlink channel from a base station to a mobile station includes at least one pilot channel composed of only a pilot signal having a known pattern, and a plurality of communication channels for transmitting information signals. Spreading the pilot signal and the information signal into a wideband signal with a spreading code faster than the transmission rate to generate a spread signal, and using the spread signal to perform communication between the base station and the mobile station. CDMA using multiple access transmission (Code Divis
A method of demodulating a receiving device of the mobile station, which is used in a transmission system, wherein a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spreading code is spread over the pilot channel. Sequentially applied to the signal, multiply the spread signal of the pilot channel and the delayed spread signal by the tap coefficient of the pilot channel based on the spread code of the pilot channel,
Adding the multiplied result to despread the spread signal of the pilot channel and outputting a despread signal of the pilot channel; and a reception pilot signal included in the despread signal of the pilot channel. Compare the pilot signal of the pattern, estimate the reception phase of each received pilot symbol in the received pilot signal, extract the average of the received phase, and obtain a phase error extraction / error to obtain an error between the received pilot symbol. Averaging step, and sequentially giving a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spreading code to the spreading signal of the communication channel,
Multiply the communication channel spread signal and the delayed spread signal by a tap coefficient of the communication channel based on the spread code of the communication channel, and add the multiplication result,
Despreading the spread signal of the communication channel and outputting a despread signal of the communication channel, and corresponding a reception phase of each information symbol in the information signal included in the despread signal of the communication channel. A communication phase channel phase error compensation step for compensating based on a reception phase of the reception pilot symbol; an identification determination step for identifying the information symbol whose phase is compensated; and the phase compensated information symbol; Calculating the tap coefficient that minimizes the mean square error of the error with the information symbol that has been identified and determined.

Eleventh, according to the present invention, a signal having a frame composed of a pilot signal of a known pattern and an information signal is spread and spread into a wideband signal with a spreading code faster than each information symbol in the information signal. CDMA (Code Division Multiple Access) that generates signals and performs multiple access transmission
A demodulation method for demodulating the spread signal used in transmission and propagated through a multipath by using the spread signal, wherein for each path, 1 / m (m is 1 or more) of a chip period of the spread code. ) Is sequentially given to the spread signal, the spread signal and the delayed spread signal are multiplied by a tap coefficient based on the spread code, the multiplication result is added, and the spread signal is despread. Outputting a spread signal; a received pilot signal included in the despread signal;
Comparing with a pilot signal of a known pattern, estimating the reception phase of the reception pilot signal, interpolating the reception phase, and estimating the reception phase of each information symbol in the information signal; Compensating the received phase error of the received pilot signal based on the estimated received phase of the received pilot signal, and compensating the phase error of the information symbol based on the estimated received phase of the information symbol Phase error compensating step, and performing a RAKE combining by multiplying the pilot signal and the information symbol whose phase has been compensated for each path by a weight coefficient.
RAKE combining step, identification determining step of identifying and determining the RAKE-combined signal, an output of the phase error compensating means of each path, and a signal in which the output of the identification determining means is power-allocated by the weight coefficient of RAKE combining. And a tap coefficient calculating step of calculating the tap coefficient for minimizing a mean square error of the error of the CDMA.

The weight coefficient may be a reception SIR (signal power to interference power ratio) of each path.

Tenth, according to the present invention, a downlink channel from a base station to a mobile station includes at least one pilot channel composed of only a pilot signal having a known pattern, and a plurality of communication channels for transmitting information signals. Spreading the pilot signal and the information signal into a wideband signal with a spreading code faster than the transmission rate to generate a spread signal, and using the spread signal to perform communication between the base station and the mobile station. CDMA using multiple access transmission (Code Divis
and a demodulation method for demodulating the spread signal, which is used in a transmission system and propagated through a multipath, by using the spread code, wherein for each path, 1 / m of a chip period of the spread code is used. (M is an integer of 1 or more) is sequentially given to the spread signal of the pilot channel, and a tap coefficient of the pilot channel based on the spread code of the pilot channel is added to the spread signal of the pilot channel and the delayed spread signal. Multiply,
Adding the multiplication result, despreading the spread signal of the pilot channel, and outputting a despread signal of the pilot channel; a received pilot signal included in the despread signal of the pilot channel; and a known pattern. The pilot signal of each received pilot symbol in the received pilot signal is estimated, and a phase error between the signal obtained by averaging the received phase and the received pilot symbol is calculated. An averaging step, a step of calculating a tap coefficient of the pilot channel that minimizes a mean square error of a phase error between the received signal and the received pilot symbol, and a chip of the spreading code. A delay of 1 / m (m is an integer of 1 or more) of a cycle is sequentially given to the spread signal of the communication channel,
Multiply the communication channel spread signal and the delayed spread signal by a tap coefficient of the communication channel based on the spread code of the communication channel, and add the multiplication result,
Despreading the spread signal of the communication channel and outputting a despread signal of the communication channel, and corresponding to a reception phase of each information symbol in the information signal included in the despread signal of the communication channel. A communication phase channel phase error compensation step for compensating based on the reception phase of the reception pilot symbol; a RAKE combination step of multiplying the information symbol, the phase of which is compensated, by a weight coefficient for each path, An identification determination step for identifying and determining a signal obtained by combining the signals, an output of the communication channel phase error compensating means of each path, and an average of an error between a signal obtained by distributing the identification determination result by a weight coefficient of the RAKE combining. Calculating the tap coefficient that minimizes the square error.

Thirteenth, according to the present invention, a downlink channel from a base station to a mobile station includes at least one pilot channel composed of only a pilot signal having a known pattern, and a plurality of communication channels for transmitting information signals. Spreading the pilot signal and the information signal into a wideband signal with a spreading code faster than the transmission rate to generate a spread signal, and using the spread signal to perform communication between the base station and the mobile station. CDMA using multiple access transmission (Code Divis
and a demodulation method for demodulating the spread signal, which is used in a transmission system and propagated through a multipath, by using the spread code, wherein for each path, 1 / m of a chip period of the spread code is used. (M is an integer of 1 or more) is sequentially given to the spread signal of the pilot channel, and a tap coefficient of the pilot channel based on the spread code of the pilot channel is added to the spread signal of the pilot channel and the delayed spread signal. Multiply,
Adding the multiplication result, despreading the spread signal of the pilot channel, and outputting a despread signal of the pilot channel; a received pilot signal included in the despread signal of the pilot channel; and a known pattern. Phase error extraction and averaging for estimating the reception phase of each received pilot symbol in the received pilot signal, averaging the received phase, and calculating the error between the received pilot symbol and the received pilot symbol. And sequentially giving a delay of 1 / m (m is an integer of 1 or more) of the chip period of the spreading code to the spread signal of the communication channel,
Multiply the communication channel spread signal and the delayed spread signal by a tap coefficient of the communication channel based on the spread code of the communication channel, and add the multiplication result,
Despreading the spread signal of the communication channel and outputting a despread signal of the communication channel, and corresponding a reception phase of each information symbol in the information signal included in the despread signal of the communication channel. A communication channel phase error compensation step for compensating based on the reception phase of the reception pilot symbol, a RAKE combination step of performing a RAKE combination by multiplying the information symbol whose phase has been compensated for each path by a weight coefficient, An identification determining step of identifying and determining the combined signal; an error between an output of the communication channel phase error compensating means of each path and a signal obtained by distributing an output result of the identifying and determining means with a weighting factor of the RAKE combining. And calculating the tap coefficient that minimizes the mean square error of the CDMA.

Fourteenth, according to the present invention, an information signal is spread into a wideband signal with a spreading code faster than its transmission rate to generate a spread signal, and the base station and the mobile station communicate with each other using the spread signal. CDMA (Code Divis
transmitting only the pilot signal of a known pattern from the base station to the mobile station through at least one pilot channel; and transmitting the information signal through a plurality of communication channels. A CDMA transmission method is provided, comprising:

A period of the spreading code may be the same as an information symbol period in the information signal.

The demodulation method of the receiving device of the mobile station is as follows: a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spreading code is sequentially applied to the spreading signal of the pilot channel; Multiplied by the tap signal of the pilot channel based on the spreading code of the pilot channel,
Adding the multiplication result, despreading the spread signal of the pilot channel, and outputting a despread signal of the pilot channel; a received pilot signal included in the despread signal of the pilot channel; and a known pattern. Phase error extraction and averaging for estimating the reception phase of each received pilot symbol in the received pilot signal, and calculating the error between the signal obtained by averaging the received phase and the received pilot symbol. A pilot channel tap coefficient calculating step of calculating a tap coefficient of the pilot channel for minimizing a mean square error of a phase error between the received signal and the received pilot symbol, and the spreading code. 1 / m (m is an integer of 1 or more) of the chip period of Sequentially applied to the signal,
Multiply the communication channel spread signal and the delayed spread signal by a tap coefficient of the communication channel based on the spread code of the communication channel, add the multiplication result,
Despreading the spread signal of the communication channel and outputting a despread signal of the communication channel, and corresponding to a reception phase of each information symbol in the information signal included in the despread signal of the communication channel. A communication channel phase error compensation step for compensating based on a reception phase of the received pilot symbol; an identification decision step for identifying the information symbol whose phase has been compensated; and the identification of the phase compensated information symbol. The method may include a step of calculating a tap coefficient that minimizes a mean square error of an error with the determined information symbol.

The demodulation method of the receiving device of the mobile station is as follows: a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spreading code is sequentially applied to the spreading signal of the pilot channel; Multiplied by the tap signal of the pilot channel based on the spreading code of the pilot channel,
Adding the multiplication result, despreading the spread signal of the pilot channel, and outputting a despread signal of the pilot channel; a received pilot signal included in the despread signal of the pilot channel; and a known pattern. The pilot signal of each received pilot symbol in the received pilot signal is estimated, and a phase error between the signal obtained by averaging the received phase and the received pilot symbol is calculated. Averaging step, and sequentially giving a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spreading code to the spreading signal of the communication channel,
Multiply the communication channel spread signal and the delayed spread signal by a tap coefficient of the communication channel based on the spread code of the communication channel, add the multiplication result,
Despreading the spread signal of the communication channel and outputting a despread signal of the communication channel, and corresponding to a reception phase of each information symbol in the information signal included in the despread signal of the communication channel. A communication channel phase error compensation step for compensating based on a reception phase of the received pilot symbol; an identification decision step for identifying the information symbol whose phase has been compensated; and the identification of the phase compensated information symbol. Calculating a tap coefficient that minimizes the mean square error of the error with the determined information symbol.

The demodulation method of the receiving device of the mobile station includes, for each path, sequentially giving a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spreading code to the spreading signal of the pilot channel, Multiply the spread signal and the delayed spread signal by a tap coefficient of the pilot channel based on the spreading code of the pilot channel,
Adding the multiplication result, despreading the spread signal of the pilot channel, and outputting a despread signal of the pilot channel; a received pilot signal included in the despread signal of the pilot channel; and a known pattern. The pilot signal of each received pilot symbol in the received pilot signal is estimated, and a phase error between the signal obtained by averaging the received phase and the received pilot symbol is calculated. An averaging step, a step of calculating a tap coefficient of the pilot channel that minimizes an average square error of a phase error between the received pilot signal and the received pilot symbol, and a chip cycle of the spreading code. 1 / m (m is an integer of 1 or more) is sequentially given to the spread signal of the communication channel,
Multiply the communication channel spread signal and the delayed spread signal by a tap coefficient of the communication channel based on the spread code of the communication channel, add the multiplication result,
Despreading the spread signal of the communication channel and outputting a despread signal of the communication channel, and corresponding to a reception phase of each information symbol in the information signal included in the despread signal of the communication channel. A communication channel phase error compensation step for compensating based on a reception phase of the reception pilot symbol; and a RAKE combination step of performing a RAKE combination by multiplying the phase-compensated pilot signal and a weight coefficient of the information symbol for each path. An identification determination step of identifying and determining the RAKE-combined signal; an output obtained in the communication channel phase error compensation step of each path; and an output obtained in the identification determination step.
Calculating a tap coefficient for minimizing a mean square error of an error with a signal to which power is distributed by a RAKE combining weighting coefficient.

The demodulation method of the receiving device of the mobile station includes, for each path, sequentially giving a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spreading code to the spreading signal of the pilot channel, Multiply the spread signal and the delayed spread signal by a tap coefficient of the pilot channel based on the spreading code of the pilot channel,
Adding the multiplication result, despreading the spread signal of the pilot channel, and outputting a despread signal of the pilot channel; a received pilot signal included in the despread signal of the pilot channel; and a known pattern. Phase error extraction and averaging for estimating the reception phase of each received pilot symbol in the received pilot signal, averaging the received phase, and calculating the error between the received pilot symbol and the received pilot symbol. And sequentially giving a delay of 1 / m (m is an integer of 1 or more) of the chip period of the spreading code to the spread signal of the communication channel,
Multiply the communication channel spread signal and the delayed spread signal by a tap coefficient of the communication channel based on the spread code of the communication channel, add the multiplication result,
Despreading the spread signal of the communication channel and outputting a despread signal of the communication channel, and corresponding to a reception phase of each information symbol in the information signal included in the despread signal of the communication channel. A communication channel phase error compensation step for compensating based on the reception phase of the reception pilot symbol; and a RAKE combination for multiplying the phase compensated pilot signal and the information symbol by a weighting factor for each path to obtain a RAKE combination. Step, an identification determining step of identifying and determining the RAKE-combined signal, and an output of the communication channel phase error compensating means of each path and an output of the identification determining means are distributed with the weighting factor of the RAKE combining power. Calculating a tap coefficient for minimizing a mean square error of an error between the signal and the signal.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a state of mutual interference between multipaths in a downlink channel.

FIG. 2 is a block diagram showing an example of a conventional demodulation circuit.

FIG. 3 is a diagram illustrating a configuration example of a signal used in interpolation type synchronous detection.

FIG. 4 is a block diagram showing a configuration up to a detection stage of a conventional receiver employing interpolation type synchronous detection.

FIG. 5 is a block diagram showing a first embodiment of the CDMA demodulation circuit according to the present invention.

FIG. 6 is a block diagram showing the configuration of the absolute phase estimation / phase error compensator in the first embodiment.

FIG. 7 is a diagram for explaining the reception phase error correction of the information symbol based on the phase error detected based on the pilot signal.

8A and 8B are flowcharts for explaining a first method for obtaining tap coefficients of an orthogonalization filter.

FIG. 9 is a flowchart for explaining a second method for obtaining tap coefficients of the orthogonalization filter.

FIGS. 10A and 10B are flowcharts for describing a third method for obtaining tap coefficients of an orthogonalization filter.

FIG. 11 is a block diagram showing a second embodiment of the CDMA demodulation circuit according to the present invention.

FIG. 12 is a conceptual diagram showing a channel configuration of a third embodiment of the CDMA demodulation circuit according to the present invention.

FIG. 13 is a block diagram showing a third embodiment of the CDMA demodulation circuit according to the present invention.

FIG. 14 is a block diagram showing a fourth embodiment of the CDMA demodulation circuit according to the present invention.

Fifteenth Embodiment is a block diagram showing a fifth embodiment of the CDMA demodulation circuit according to the present invention.

FIGS. 16A and 16B are block diagrams showing a pilot symbol averaging circuit in the fifth embodiment.

FIG. 17 is a block diagram showing a sixth embodiment of the CDMA demodulation circuit according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG. 5 is a block diagram showing a first embodiment of the demodulation circuit according to the present invention. This demodulation circuit corresponds to the receiver shown in FIG.
It is connected to the output terminal of the AFC 24, from which a received spread signal is supplied. The signals and tap coefficients described below are treated as vectors having in-phase components and quadrature components. Therefore, for example, “tap coefficient” and “tap coefficient vector” indicate the same one.

In FIG. 5, the received spread signal is supplied to an orthogonalization filter 103 through an input terminal 101. The orthogonalization filter 103 includes a delay unit 104, a tap coefficient multiplication unit 105, and a tap signal addition unit 105. The delay unit 104
It has M (M is an integer of 1 or more) taps extracted for each delay of 1 / m (m is an integer of 1 or more) of the chip period Tc of the spreading code, and the total delay time is several symbol periods. (For example, 5 cycles). The output signal of each tap is supplied to each multiplier of tap coefficient multipliers 105, the tap coefficient vector C _M, ..., is multiplied by C _1. These tap coefficients are determined by the spreading code, and are controlled by adaptive control described later so that the received code of the own channel becomes orthogonal to the spreading code of another user. The products output from the multipliers are added by tap coefficient adding section 106 and output as narrow-band despread signals. This despread signal is supplied to absolute phase estimation / phase error compensation section 107.

FIG. 6 is a block diagram showing a configuration of the absolute phase estimation / phase error compensation unit 107.

The despread signal output from the orthogonalization filter 103 in FIG. 5 is supplied to the pilot synchronization detection unit 122 in FIG. The pilot synchronization detecting unit 122 reproduces the clock timing of each symbol, and also reproduces the frame timing, which is the repetition period of the pilot signal, to generate a symbol synchronization signal and a frame synchronization signal. These symbol synchronization signal and frame synchronization signal are supplied to each unit of the absolute phase estimation / phase error compensation unit 107. Pilot synchronization detecting section 122 also supplies the despread signal to pilot phase error estimating section 124 and phase error compensating section 128.

Pilot phase error estimating section 124 compares a known pattern normal pilot symbol supplied from pilot signal generating section 125 with a pilot symbol included in the despread signal, and detects a phase shift of the pilot symbol from the normal pilot symbol. That is, the phase error is detected. By performing this operation every time a pilot symbol is received, it is possible to estimate in real time the fluctuation of the phase error due to the fluctuation of the transmission path. After the estimated phase error is averaged within the pilot signal interval,
This is supplied to information symbol phase error estimating section 126.

Information symbol phase error estimating section 126 estimates the phase error for each information symbol by interpolating the average phase error obtained in the pilot signal section. That is, primary or secondary interpolation is performed using each phase error obtained in a plurality of adjacent pilot signal sections, and a phase error at each information symbol timing between pilot signals is estimated. Thus, information symbol phase error estimating section 126 generates one estimated phase error per information symbol and supplies them to phase error compensating section 128. The phase error compensator 128
Each information symbol is compensated using the estimated phase error.

FIG. 7 shows a method of compensating for a phase error of an information symbol by the phase error compensator 128. By interpolating the average phase vectors P1 and P2 obtained in two adjacent pilot sections, a broken line Pi is obtained. From this broken line Pi and the position of each information symbol with respect to the pilot signal, phase vectors S1, S2,... Of each information symbol are obtained. The curve CV in the figure is an example of the end point locus of the actual phase vector of each symbol. FIG. 7 shows the simplest linear interpolation, but it is also possible to use a method such as quadratic interpolation or Gaussian interpolation, the details of which are described in the aforementioned Sampai paper.

The information symbol compensated by the absolute phase estimation / phase error compensator 107 is supplied to the identification determiner 108 and the error vector calculator 109. The identification determination unit 108 performs absolute synchronous detection of each information symbol, outputs the result as a demodulated output from the output terminal 102, and
Supply 9

The error vector calculation unit 109 obtains an error between the information symbol output from the absolute phase estimation / phase error compensation unit 107 and the demodulation output output from the identification determination unit 108, and multiplies the error as an error signal (error vector). To the vessel 111. The multiplier 111 multiplies the error signal by the estimated phase estimated by the absolute phase estimation / phase error compensation unit 107 by vector. this is,
This is for matching the phase of the input signal with the phase of the error signal. The output of multiplier 111 is supplied to tap coefficient control section 110.

Tap coefficient control section 110, based on the error vector,
The tap coefficient vectors C _M ,..., C ₁ of the orthogonalization filter 103 are obtained. That is, a tap coefficient vector that minimizes the mean square error of the error vector is obtained. In this specification, this is referred to as calculation of a tap coefficient vector based on MMSE (Minimum Mean-Square Error) standard. The tap coefficient vector obtained based on the MMSE standard is supplied to the orthogonalization filter 103.

This demodulation circuit differs from the circuit disclosed in the above-mentioned Sampei's paper in that tap coefficients are obtained based on the MMSE standard. In Sampei's method, since the amplitude fluctuation is also removed at the stage of compensation, no interference wave component remains in the compensated signal,
The MMSE-based orthogonalization filter cannot remove interference.

FIGS. 8A to 10B are flowcharts illustrating a method of obtaining a tap coefficient vector.

The method shown in FIGS. 8A and 8B is based on LMS (Least Mean Squam) for each symbol of the pilot signal and the information signal.
re), RLS (Recursive Least Square), or the like, and is a method of obtaining tap coefficients based on the MMSE standard using an averaging adaptive algorithm. In this method, all information symbols are used in addition to the pilot symbols, so that the tracking performance is good. Hereinafter, this method will be described with reference to FIGS. 8A and 8B.

In step SP1, pilot phase error estimating section 124
Estimates the phase error of the first symbol in the pilot signal. In step SP2, the phase error compensator 128
The phase of this pilot symbol is compensated. Step SP
In 3, the tap coefficient control unit 110 determines a tap coefficient by applying MMSE to this pilot symbol,
In 4, the obtained tap coefficients are fed back to the orthogonalization filter 103. In step SP5, the absolute phase estimation / phase error compensation unit 107 determines whether or not all symbols in the pilot signal section have been completed. Return to SP1. Thus, the phase error is estimated for all symbols in one pilot signal section,
Perform phase compensation.

When the estimation and compensation of the phase error for the pilot signal are completed, the absolute phase estimation / phase error compensation unit 107
Estimate and compensate for the phase error of each symbol in the information signal. In step SP11, the information symbol phase error estimator 126 estimates the phase error for the first information symbol in the information signal. This is performed by an interpolation method using an average value of the phase errors obtained for the pilot symbols as shown in FIG. In step SP12, the phase error compensator 128 compensates for the phase of this information symbol. In step S13, tap coefficient control section 110 calculates a tap coefficient by applying MMSE to the information symbol, and feeds the calculated tap coefficient back to orthogonalization filter 103 in step SP14. Step SP1
In 5, the absolute phase estimation / phase error compensation unit 107 determines whether all information symbols in one frame have been completed,
If there is still an information symbol, in step SP16, the next information symbol is selected, and the process returns to step SP11.
In this way, the phase error is estimated for all symbols in one frame, and phase compensation is performed. This operation is a step
It continues until the end of communication is detected in SP20.

The method shown in FIG. 9 is a method for obtaining a tap coefficient vector based on the MMSE standard using only pilot symbols. Since this method uses only pilot symbols of a known pattern, the error is small, but the tracking performance is poor. Hereinafter, this method will be described.

In step SP31, the pilot phase error estimator 12
4 estimates the phase error for the first symbol in the pilot signal. In step SP32, the phase error compensator 128 compensates for the phase of this pilot symbol. In step SP33, the absolute phase estimation / phase error compensation unit 107 determines whether or not all the symbols in the pilot signal section have been completed, and if there are more symbols, in step SP36, selects the next symbol and proceeds to step SP36.
Return to SP31.

When the estimation and compensation of the phase error for all the symbols in one pilot signal section are completed, step SP34
In, the tap coefficient control section 110 averages the compensated pilot symbols, obtains a tap coefficient by applying MMSE, and feeds back the obtained tap coefficient to the orthogonalization filter 103 in step SP35. This operation
The process is continued until the end of the communication is detected in step SP37.

FIGS.10A and 10B show that in a pilot section, a tap coefficient vector is obtained by using a pilot symbol, and in an information section, a tap coefficient vector obtained by using a pilot symbol is interpolated to obtain a tap coefficient vector for each information symbol. It is. Since the following ability is improved as compared with the method of FIG. 9, this method is suitable for a case where an outgoing call or an incoming call occurs and the state of the spread code in the cell changes. This method, as shown in FIGS. 10A and 10B, is performed in step SP31 of FIG.
-36 and steps SP11-20 in FIG. 8B are combined, and a description thereof will be omitted.

Embodiment 2 FIG. 11 is a block diagram showing a second embodiment of the demodulation circuit according to the present invention. This embodiment is used when multipath exists. FIG. 11 shows the simplest two-pass case. However, in the case of three or more multi-passes, a similar configuration can be realized by providing an optimally controlled orthogonal filter for each pass. it can.

In FIG. 11, the received signal that has propagated on the first path is
The signal is despread by the orthogonalization filter 103-1 and phase-compensated by the absolute phase estimation / phase error compensation unit 107-1. Up to this point, the operation is the same as in the first embodiment. Similarly, the received signal propagating through the second path is output to the orthogonalization filter 103
-2, and is phase-compensated by the absolute phase estimation / phase error compensator 107-2.

Further, the tap coefficient control unit 110-1 for the first pass obtains the tap coefficient vector of the orthogonalization filter 103-1 from the error vector, and feeds it back to the orthogonalization filter 103-1. In this case, the tap coefficient control unit 110-1
The tap coefficient vector is calculated by regarding the signal of the first path as a desired signal and the signal of the own channel of the second path as an interference wave. Similarly, the tap coefficient control unit 110-2 of the second pass
Calculates the tap coefficient vector of the orthogonalization filter 103-2 from the error vector, and feeds it back to the orthogonalization filter 103-2. In this case, tap coefficient control section 110
-2 calculates a tap coefficient vector by regarding the signal of the second path as a desired signal and the signal of the own channel of the first path as an interference wave. In this way, the tap coefficients of the orthogonalization filter are obtained for each pass. In the figure, reference numeral 154 denotes a delay of the signal of the second path with respect to the signal of the first path.

The signals output from the orthogonalization filters 103-1 and 103-2 are input to the absolute phase estimation / phase error compensators 107-1 and 107-2, respectively, to compensate for phase errors. The two signals whose phases have been compensated are supplied to the RAKE combining section 150.

RAKE combining section 150 combines the two input signals. That is, the signal power to interference power ratio (SIR) of each path
, The in-phase weighted synthesis is performed so as to obtain the maximum ratio synthesis. This synthesis method is conventionally known. The synthesized signal is determined by the identification determination unit 108.

The output signal whose identification has been determined is output from the output terminal 102 as a demodulated output, and is output to the multipliers 152-1 and 152-1.
-2 and weighted by SIR. The weighted identification determination output is output to the error vector calculation unit 109-1.
And 109-2. Error vector calculator 109-
1 and 109-2 are weighted identification output,
The differences from the outputs from the absolute phase estimation / phase error compensating units 107-1 and 107-2 are obtained, and the obtained differences are used as error vectors to the tap coefficient control units 110-1 and 110-2 via the multiplier 111. Supply. In this way, the power of the signal vector after the discrimination determination is distributed by the weighting coefficient of the RAKE combination, and the error between the distributed signal and the output of each path after the phase fluctuation compensation is calculated, and the mean square error is minimized. Thus, the tap coefficients of the orthogonalization filter are controlled.

As described above, the demodulation circuit according to the present invention can be applied even when a multipath exists. In this case, since weighting is performed according to the SIR of each path, a highly reliable tap coefficient vector can be obtained.

In the above-described first and second embodiments, the frame configuration in which the pilot signal is inserted between the information signals is employed. In this case, the insertion period of the pilot signal needs to be sufficiently shorter than the fluctuation period of the transmission path.

By the way, focusing on the downlink (base station to mobile station) channel of the cellular communication system, the signal transmitted from the base station is the same for both the transmission signal to a certain mobile station and the transmission signal to another user. To reach the mobile station. Therefore, it is not necessary to insert the pilot signal used for estimating the variation of the propagation path into the individual channel of each user,
It is considered that the frame efficiency is improved by providing a common pilot channel dedicated to the pilot signal and each user sharing the common pilot channel. The following embodiment relates to a demodulation circuit used in a system having such a common pilot channel.

Embodiment 3 FIG. 12 shows a frame configuration of a downlink channel from a base station to a mobile station used in the present embodiment. One pilot channel is provided for N communication channels. This pilot channel is composed of a group of symbols having a known pattern, and is used as a reference signal for performing phase compensation on a signal propagated through each communication channel.

FIG. 13 is a block diagram showing the configuration of the third embodiment of the demodulation circuit according to the present invention. The spread signal applied to the input terminal 101 is output to the orthogonalization filter 103P for the pilot channel.
Is supplied to the orthogonalization filter 103T for the communication channel. Orthogonalization filters 103P and 103T despread the spread signal using tap coefficients generated based on the spreading code in the same manner as orthogonalization filter 103 of the above-described embodiment,
Output narrowband despread signals S ₁₁ and S _12, respectively.
In this case, the pilot channel and the communication channel are despread using different spreading codes.

The output signal S ₁₁ of the orthogonalizing filter 103P, since signals corresponding to the pattern known pilot signal, by determining the reception phase relative to the pattern known pilot signals generated in the demodulation circuit, the amplitude fluctuation and due to fading Phase variation can be determined. The reception signal S _11, also includes the cross-correlation components due to signals associated with other users.

Pilot symbol phase error extraction and averaging section 161 includes:
Averaging the received pilot symbols over a predetermined time,
The error due to instantaneous Rayleigh fluctuation is averaged. The vector obtained by the averaging includes a cross-correlation component with a signal related to another user. Therefore, the tap coefficient control unit 110P
A tap coefficient that minimizes the mean square error of the error between the averaged vector and the received pilot symbol vector is calculated and fed back to the orthogonalization filter 103P.

The phase compensation of each symbol of the communication channel is performed by the communication channel phase error compensator 162 using synchronized pilot symbols. That is, using the received phase of the corresponding pilot symbol, corrects each symbol phase of the signal S ₁₂ outputted from the orthogonalizing filter 103T of the communication channel. Communication channel phase error compensator 162 signal S ₁₃ after phase compensation output from is determined identified by the identification determination unit 108, the identification determination result is output as a demodulated output from the output terminal 12. The output of the identification judgment unit 108 is also supplied to the error vector calculation unit 109, the error vector which is the difference between the signals S ₁₃ are calculated. Tap coefficient control section 110T obtains a tap coefficient that minimizes the mean square error of the error vector, and supplies it to orthogonal filter 103T.

According to this embodiment, using a pilot channel that continuously transmits a pilot signal with a known pattern,
Since the phase fluctuation of the transmission path is continuously estimated, excellent tracking performance against Rayleigh fading can be obtained.

Fourth Embodiment FIG. 14 is a block diagram showing a fourth embodiment of the demodulation circuit according to the present invention. In this embodiment, the demodulation circuit of the third embodiment is applied to a receiver used in a multipath environment. Since this is similar to the relationship between the first embodiment shown in FIG. 5 and the second embodiment shown in FIG. 11, refer to the description of the corresponding parts of the second embodiment. Therefore, detailed description is omitted.

Fifteenth Embodiment FIG. 15 is a block diagram showing a fifth embodiment of the demodulation circuit according to the present invention. This embodiment differs from the third embodiment shown in FIG. 13 in the following points.

(1) Matched filter instead of orthogonal filter 103P
171 is input terminal 101 and pilot channel phase error
Connection to the averaging unit 161.

(2) The tap coefficient control unit 110P for the pilot channel has been removed.

According to such a configuration, since there is no tap coefficient control unit, the configuration is simplified and the processing amount is reduced as compared with the third embodiment. However, since an interference wave component is mixed in the pilot signal, it is necessary to average many pilot symbols in order to increase the estimation accuracy. FIG.
FIG. 16B shows a configuration of an averaging circuit for averaging pilot symbols. This is provided in pilot channel phase error extraction / averaging section 161 and averages pilot symbols over a predetermined time.

The circuit in FIG. 16A is a circuit for calculating the arithmetic average of pilot symbols. The N pilot symbols stored in the buffer 181 are added together by the adder 183, and the divided
Divide by N at 85.

The circuit shown in FIG. 16B is a circuit for taking a weighted average of two pilot symbols. Thus, the average of the pilot symbols is obtained.

In the present embodiment, since the average of many pilot symbols is obtained, the follow-up property to the fast fading is considered to be disadvantageous compared to the third embodiment. Therefore, the third embodiment and the present embodiment can be selectively used depending on the circuit scale and the fading environment.

Sixth Embodiment FIG. 17 is a block diagram showing a sixth embodiment of the demodulation circuit according to the present invention. In this embodiment, the demodulation circuit of the fifth embodiment is applied to a receiver used in a multipath environment. Since this is similar to the relationship between the first embodiment shown in FIG. 5 and the second embodiment shown in FIG. 11, refer to the description of the corresponding parts of the second embodiment. Therefore, detailed description is omitted.

Also in this embodiment, similarly to the second and fourth embodiments, the signal vector after the discrimination determination is power-allocated by the weight coefficient of RAKE combining, and the allocated signal and the output of each path after the phase variation compensation are performed. And the tap coefficient of the orthogonalization filter is controlled so that the mean square error is minimized.

Continuation of the front page (56) References JP-A-5-227124 (JP, A) JP-A-51-115754 (JP, A) JP-A-56-75731, (JP, A) Table 6-501349 (JP) , A) IEICE 1994 Spring Conference Lecture Papers (Part 2), [Lecture No. B-419], (1994-3), p419 (58) Fields surveyed (Int. Cl. ⁶ , DB name) H04J 13/00

Claims (40)

(57) [Claims] 1. A spread signal is generated by spreading a signal having a frame consisting of a pilot signal of a known pattern and an information signal into a wideband signal with a spreading code faster than each information symbol in the information signal. CD for multiple access transmission
A demodulation circuit used in MA (Code Division Multiple Access) transmission for demodulating the spread signal using the spread code, wherein 1 / m (m is an integer of 1 or more) of a chip period of the spread code.
A plurality of delay circuits for sequentially giving the delay of the spread signal,
A plurality of multipliers for multiplying the spread signal and the delayed spread signal by a tap coefficient based on the spread code; and an adder for adding an output of the multiplier, and the spread signal is despread and despread. A quadrature filter that outputs a spread signal, a received pilot signal included in the despread signal, and a pilot signal of a known pattern are compared with each other to estimate a received phase of the received pilot signal and to set the received phase. Interpolating and absolute phase estimating means for estimating the reception phase of each information symbol in the information signal, and compensating for the reception phase error of the reception pilot signal based on the estimated reception phase of the reception pilot signal. A phase error compensating means for compensating a phase error of the information symbol based on the estimated reception phase of the information symbol; Identification determining means for identifying the compensated pilot signal and the information symbol whose phase has been compensated, and minimizing the mean square error of the error between the output of the phase error compensating means and the output of the identification determining means. A tap coefficient control means for calculating a tap coefficient and supplying the calculated tap coefficient to the orthogonalization filter. 2. The tap coefficient control means calculates the tap coefficient for minimizing the mean square error for each symbol in the pilot signal, and calculates the tap coefficient for each symbol in the information signal. The CDMA demodulation circuit according to claim 1, wherein the tap coefficient that minimizes a mean square error is calculated. 3. The CDMA demodulation circuit according to claim 1, wherein said tap coefficient control means calculates said tap coefficient for minimizing said mean square error for each said pilot signal. 4. The tap coefficient control means calculates the tap coefficient for minimizing the mean square error for each pilot signal, and calculates the mean square error for each symbol in the information signal. 2. The CD according to claim 1, wherein the tap coefficient that minimizes
MA demodulation circuit. 5. A downlink channel from a base station to a mobile station includes at least one pilot channel composed of only a pilot signal having a known pattern, and a plurality of communication channels for transmitting information signals. Spreading the information signal into a wideband signal with a spreading code faster than the transmission rate to generate a spread signal, and using the spread signal to perform communication between the base station and the mobile station using multiple access transmission CDMA (Code Division Multiple A)
ccess) a demodulation circuit of a receiving device of the mobile station, used in a transmission system, comprising: a pilot channel demodulation unit for demodulating the pilot channel; and a demodulation circuit provided for each communication channel to demodulate the communication channel. A pilot channel demodulation unit, wherein the pilot channel demodulation unit is 1 / m (m is an integer of 1 or more) of a chip period of the spreading code.
A plurality of delay circuits for sequentially giving the delay of the pilot channel to the spread signal of the pilot channel, and a plurality of delay circuits for multiplying the spread signal of the pilot channel and the delayed spread signal by a tap coefficient of the pilot channel based on the spread code of the pilot channel. A pilot channel orthogonalizing filter for despreading the spread signal of the pilot channel and outputting a despread signal of the pilot channel, comprising: The received pilot signal included in the despread signal and a pilot signal of a known pattern are compared to estimate the reception phase of each reception pilot symbol in the reception pilot signal, and a signal obtained by averaging the reception phase. Phase error extraction for obtaining a phase error with the received pilot symbol A signal obtained by averaging said received phases and averaging means, the average of the phase error between the received pilot symbols 2
A pilot channel tap coefficient control means for calculating a tap coefficient of the pilot channel for minimizing a multiplication error, and supplying the pilot channel tap coefficient to the pilot channel orthogonalization filter. 1 / m (m is an integer of 1 or more)
A plurality of delay circuits for sequentially giving the delay of the communication channel to the spread signal of the communication channel, and a plurality of delay circuits for multiplying the communication channel spread signal and the delayed spread signal by a tap coefficient of the communication channel based on a spread code of the communication channel. A communication channel orthogonalization filter that includes a multiplier and an adder that adds an output of the multiplier, and that despreads the spread signal of the communication channel to output a despread signal of the communication channel; A communication channel phase error compensator for compensating a reception phase of each information symbol in the information signal included in the despread signal based on a reception phase of the corresponding reception pilot symbol; and calculating a tap coefficient of the communication channel. And a communication channel tap coefficient control means for supplying to the communication channel orthogonalization filter, The communication channel tap coefficient control unit further includes an identification determination unit configured to identify the information symbol whose phase has been compensated, wherein the communication channel tap coefficient control unit determines whether the information symbol has the phase compensated and the information symbol identified and determined. A CDMA demodulation circuit for calculating the tap coefficient that minimizes the mean square error of the error. 6. A downlink channel from a base station to a mobile station includes at least one pilot channel composed of only a pilot signal having a known pattern, and a plurality of communication channels for transmitting information signals. Spreading the information signal into a wideband signal with a spreading code faster than the transmission rate to generate a spread signal, and using the spread signal to perform communication between the base station and the mobile station using multiple access transmission CDMA (Code Division Multiple Acc)
ess) a demodulation circuit of a receiving device of the mobile station, used in a transmission system, comprising: a pilot channel demodulation section for demodulating the pilot channel; and a demodulation circuit provided for each communication channel to demodulate the communication channel. A pilot channel demodulation unit, wherein the pilot channel demodulation unit is 1 / m (m is an integer of 1 or more) of a chip period of the spreading code.
A plurality of delay circuits for sequentially giving the delay of the pilot channel to the spread signal of the pilot channel, and a plurality of delay circuits for multiplying the spread signal of the pilot channel and the delayed spread signal by a tap coefficient of the pilot channel based on the spread code of the pilot channel. A pilot channel matched filter for despreading the spread signal of the pilot channel to output a despread signal of the pilot channel, and a multiplier for adding the output of the multiplier. A received pilot signal included in the despread signal and a pilot signal of a known pattern are compared, a reception phase of each reception pilot symbol in the reception pilot signal is estimated, and a signal obtained by averaging the reception phase, Phase error extraction / average for obtaining an error with the received pilot symbol And a communication channel demodulation unit, wherein 1 / m (m is an integer of 1 or more) of a chip period of the spreading code.
A plurality of delay circuits for sequentially giving the delay of the communication channel to the spread signal of the communication channel; and a plurality of delay circuits for multiplying the spread signal of the communication channel and the delayed spread signal by a tap coefficient of the communication channel based on the spread code of the communication channel. A communication channel orthogonalization filter for despreading the spread signal of the communication channel to output a despread signal of the communication channel, the filter comprising: A communication channel phase error compensating means for compensating the reception phase of each information symbol in the information signal included in the despread signal based on the reception phase of the corresponding reception pilot symbol; and a tap coefficient of the communication channel. A communication channel tap coefficient control means for calculating and supplying the communication channel tap coefficient to the communication channel orthogonalization filter; The communication channel tap coefficient control unit further includes: an identification symbol that identifies and identifies the information symbol whose phase has been compensated. The communication channel tap coefficient control unit includes: an information symbol whose phase has been compensated; A CDMA demodulation circuit for calculating the tap coefficient for minimizing the mean square error of the error. 7. A spread signal is generated by spreading a signal having a frame consisting of a pilot signal of a known pattern and an information signal into a wideband signal with a spreading code faster than each information symbol in the information signal; CD for multiple access transmission
A demodulation circuit that is used in MA (Code Division Multiple Access) transmission and demodulates the spread signal propagated through multipath using the spread code,
For each pass, 1 / m of the chip period of the spreading code (m is an integer of 1 or more)
A plurality of delay circuits for sequentially giving the delay of the spread signal,
A plurality of multipliers for multiplying the spread signal and the delayed spread signal by a tap coefficient based on the spread code; and an adder for adding an output of the multiplier, and the spread signal is despread and despread. A quadrature filter that outputs a spread signal, a received pilot signal included in the despread signal, and a pilot signal of a known pattern are compared with each other to estimate a received phase of the received pilot signal and to set the received phase. Interpolating and absolute phase estimating means for estimating the reception phase of each information symbol in the information signal, and compensating for the reception phase error of the reception pilot signal based on the estimated reception phase of the reception pilot signal. A phase error compensating means for compensating for a sum of position error of the information symbol based on the estimated reception phase of the information symbol; Tap coefficient control means for calculating the number and supplying the result to the orthogonalization filter. The demodulation circuit further includes a weight for the pilot signal and the information symbol whose phase has been compensated for each path. A RAKE combining circuit for performing RAKE combining by multiplying a coefficient, and identification determining means for identifying a RAKE-combined signal, wherein the tap coefficient controlling means of each path includes an output of the phase error compensating means of each path. And the output of the identification determining means
A CDMA demodulation circuit for calculating the tap coefficient for minimizing a mean square error of an error between a signal and power distributed by the weight coefficient in RAKE combining. 8. The tap coefficient control means calculates the tap coefficient for minimizing the mean square error for each symbol in the pilot signal, and calculates the tap coefficient for each symbol in the information signal. 8. The CDMA demodulation circuit according to claim 7, wherein said tap coefficient for minimizing a mean square error is calculated. 9. The CDMA demodulation circuit according to claim 7, wherein said tap coefficient control means calculates said tap coefficient for minimizing said mean square error for each said pilot signal. . 10. The tap coefficient control means calculates the tap coefficient for minimizing the mean square error for each pilot signal, and calculates the mean square error for each symbol in the information signal. 8. The method according to claim 7, wherein the tap coefficient for minimizing is calculated.
CDMA demodulation circuit. 11. The method according to claim 11, wherein the weighting factor is a reception SIR of each path.
8. The CDMA demodulation circuit according to claim 7, wherein (signal power to interference power ratio). 12. A downlink channel from a base station to a mobile station,
At least one pilot channel composed only of a pilot signal having a known pattern, and a plurality of communication channels for transmitting an information signal, wherein the pilot signal and the information signal are spread over a wide band with a spreading code faster than its transmission rate. Generate a spread signal by spreading the signal, the communication between the base station and the mobile station using the spread signal,
CDMA (Code Division Multiple) using multiple access transmission
Access) A demodulation circuit for demodulating, using the spreading code, the spread signal used in a transmission system and propagated through a multipath, and for each path, a pilot channel demodulation unit for demodulating the pilot channel. And a communication channel demodulation unit provided for each of the communication channels, for demodulating the communication channel, wherein the pilot channel demodulation unit is 1 / m (m is 1 or more) of the chip period of the spreading code. integer)
A plurality of delay circuits for sequentially giving the delay of the pilot channel to the spread signal of the pilot channel, and a plurality of delay circuits for multiplying the spread signal of the pilot channel and the delayed spread signal by a tap coefficient of the pilot channel based on the spread code of the pilot channel. A pilot channel orthogonalizing filter for despreading the spread signal of the pilot channel and outputting a despread signal of the pilot channel, comprising: The received pilot signal included in the despread signal and a pilot signal of a known pattern are compared to estimate the reception phase of each reception pilot symbol in the reception pilot signal, and a signal obtained by averaging the reception phase. , A phase error extraction for obtaining a phase error with the received pilot symbol Averaging means, for calculating a tap coefficient of the pilot channel for minimizing a mean square error of a phase error between the signal obtained by averaging the reception phase and the received pilot symbol, and supplying the tap coefficient to the pilot channel orthogonalization filter. And a communication channel demodulation unit, wherein 1 / m (m is an integer of 1 or more) of a chip period of the spreading code.
A plurality of delay circuits for sequentially giving the delay of the communication channel to the spread signal of the communication channel, and a plurality of delay circuits for multiplying the communication channel spread signal and the delayed spread signal by a tap coefficient of the communication channel based on a spread code of the communication channel. A communication channel orthogonalization filter that includes a multiplier and an adder that adds an output of the multiplier, and that despreads the spread signal of the communication channel to output a despread signal of the communication channel; A communication channel phase error compensator for compensating a reception phase of each information symbol in the information signal included in the despread signal based on a reception phase of the corresponding reception pilot symbol; and calculating a tap coefficient of the communication channel. And a communication channel tap coefficient control means for supplying to the communication channel orthogonalization filter, Further, a RAKE combining circuit for performing a RAKE combining by multiplying the information symbol whose phase has been compensated for each path by a weighting factor, and an identification determining means for identifying and determining the RAKE-combined signal, The communication channel tap coefficient control means of the output of the communication channel phase error compensation means of each path,
A CDMA demodulation circuit, wherein the tap coefficient for minimizing an average square error of an error between a signal obtained by distributing an output of the discrimination determination means and a power by a weight coefficient of the RAKE combination is calculated. 13. The method according to claim 12, wherein the weighting factor is a reception SIR of each path.
13. The CMDA demodulation circuit according to claim 12, wherein (signal power to interference power ratio). 14. A downlink channel from a base station to a mobile station,
At least one pilot channel composed only of a pilot signal having a known pattern, and a plurality of communication channels for transmitting an information signal, wherein the pilot signal and the information signal are spread over a wide band with a spreading code faster than its transmission rate. Generate a spread signal by spreading the signal, the communication between the base station and the mobile station using the spread signal,
CDMA (Code Division Multiple) using multiple access transmission
Access) A demodulation circuit for demodulating, using the spreading code, the spread signal used in a transmission system and propagated through a multipath, and for each path, a pilot channel demodulation unit for demodulating the pilot channel. And a communication channel demodulation unit provided for each of the communication channels, for demodulating the communication channel, wherein the pilot channel demodulation unit is 1 / m (m is 1 or more) of the chip period of the spreading code. integer)
A plurality of delay circuits for sequentially giving the delay of the pilot channel to the spread signal of the pilot channel, and a plurality of delay circuits for multiplying the spread signal of the pilot channel and the delayed spread signal by a tap coefficient of the pilot channel based on the spread code of the pilot channel. A pilot channel matched filter for despreading the spread signal of the pilot channel to output a despread signal of the pilot channel, and a multiplier for adding the output of the multiplier. A received pilot signal included in the despread signal and a pilot signal of a known pattern are compared, a reception phase of each reception pilot symbol in the reception pilot signal is estimated, and a signal obtained by averaging the reception phase, Phase error extraction / average for obtaining an error with the received pilot symbol And a communication channel demodulation unit, wherein 1 / m (m is an integer of 1 or more) of a chip period of the spreading code.
A plurality of delay circuits for sequentially giving the delay of the communication channel to the spread signal of the communication channel; and a plurality of delay circuits for multiplying the spread signal of the communication channel and the delayed spread signal by a tap coefficient of the communication channel based on the spread code of the communication channel. A communication channel orthogonalization filter that despreads the spread signal of the communication channel and outputs a despread signal of the communication channel, the multiplier comprising: A communication channel phase error compensating means for compensating a reception phase of an information symbol in the information signal included in the despread signal based on a reception phase of the corresponding reception pilot symbol; and calculating a tap coefficient of the communication channel. And a communication channel tap coefficient control means for supplying to the communication channel orthogonalization filter, Further, a RAKE combining circuit for performing a RAKE combining by multiplying the information symbol whose phase has been compensated for each path by a weighting factor, and an identification determining means for identifying and determining the RAKE-combined signal, The communication channel tap coefficient control means of the output of the communication channel phase error compensation means of each path,
A CDMA demodulation circuit, wherein the tap coefficient for minimizing an average square error of an error between a signal obtained by distributing an output of the discrimination determination means and a power by a weight coefficient of the RAKE combination is calculated. 15. The method according to claim 15, wherein the weighting factor is a reception SIR of each path.
15. The CDMA demodulation circuit according to claim 14, wherein (signal power to interference power ratio). 16. A spread signal is generated by spreading an information signal into a wideband signal with a spreading code faster than its transmission rate, and communication between a base station and a mobile station is performed using the spread signal. CDMA (Code Division Mult) performed by multiple access transmission
In the iple Access) transmission system, a downlink channel from the base station to the mobile station includes at least one pilot channel composed of only a pilot signal having a known pattern, and a plurality of communication channels for transmitting the information signal. The demodulation circuit of the receiving device of the mobile station, a pilot demodulation unit for demodulating the pilot channel, provided for each communication channel, a communication channel demodulation unit for demodulating the communication channel, The pilot channel demodulation unit comprises: 1 / m (m is an integer of 1 or more) of a chip period of the spreading code.
A plurality of delay circuits for sequentially giving the delay of the pilot channel to the spread signal of the pilot channel, and a plurality of delay circuits for multiplying the spread signal of the pilot channel and the delayed spread signal by a tap coefficient of the pilot channel based on the spread code of the pilot channel. A pilot channel orthogonalizing filter for despreading the spread signal of the pilot channel and outputting a despread signal of the pilot channel, comprising: A received pilot signal included in the despread signal and a pilot signal of a known pattern are compared, a reception phase of each reception pilot symbol in the reception pilot signal is estimated, and a signal obtained by averaging the reception phase, Phase error extraction and flattening for obtaining a phase error with the received pilot symbol Averaging means, calculating a tap coefficient of the pilot channel for minimizing a mean square error of a phase error between the signal obtained by averaging the reception phase and the received pilot symbol, and supplying the tap coefficient to the pilot channel orthogonalization filter. A pilot channel tap coefficient control unit, wherein the communication channel demodulation unit is 1 / m (m is an integer of 1 or more) of a chip period of the spreading code.
A plurality of delay circuits for sequentially giving the delay of the communication channel to the spread signal of the communication channel, and a plurality of delay circuits for multiplying the communication channel spread signal and the delayed spread signal by a tap coefficient of the communication channel based on a spread code of the communication channel. A communication channel orthogonalization filter that includes a multiplier and an adder that adds an output of the multiplier, and that despreads the spread signal of the communication channel to output a despread signal of the communication channel; A communication channel phase error compensator for compensating a reception phase of each information symbol in the information signal included in the despread signal based on a reception phase of the corresponding reception pilot symbol; and calculating a tap coefficient of the communication channel. And a communication channel tap coefficient control means for supplying to the communication channel orthogonalization filter, The communication channel tap coefficient control unit further includes an identification determination unit configured to identify the information symbol whose phase has been compensated, wherein the communication channel tap coefficient control unit determines whether the information symbol has the phase compensated and the information symbol identified and determined. Calculating the tap coefficient for minimizing the mean square error of the error.
CDMA transmission system. 17. A spread signal is generated by spreading an information signal into a wideband signal with a spreading code faster than its transmission rate, and communication between a base station and a mobile station is performed using the spread signal. CDMA (Code Division Mult) performed by multiple access transmission
In the iple Access) transmission system, a downlink channel from the base station to the mobile station includes at least one pilot channel composed of only a pilot signal having a known pattern, and a plurality of communication channels for transmitting the information signal. A demodulation circuit of the receiving device of the mobile station, a pilot channel demodulation unit for demodulating the pilot channel, a communication channel demodulation unit provided for each communication channel, for demodulating the communication channel. The pilot channel demodulation unit comprises: 1 / m (m is an integer of 1 or more) of a chip period of the spreading code.
A plurality of delay circuits for sequentially giving the delay of the pilot channel to the spread signal of the pilot channel, and a plurality of delay circuits for multiplying the spread signal of the pilot channel and the delayed spread signal by a tap coefficient of the pilot channel based on the spread code of the pilot channel. A pilot channel matched filter for despreading the spread signal of the pilot channel to output a despread signal of the pilot channel, and a multiplier for adding the output of the multiplier. A received pilot signal included in the despread signal and a pilot signal of a known pattern are compared, a reception phase of each reception pilot symbol in the reception pilot signal is estimated, and a signal obtained by averaging the reception phase, Phase error extraction / average for obtaining an error with the received pilot symbol And a communication channel demodulation unit, wherein 1 / m (m is an integer of 1 or more) of a chip period of the spreading code.
A plurality of delay circuits for sequentially giving the delay of the communication channel to the spread signal of the communication channel, and a plurality of delay circuits for multiplying the communication channel spreading signal and the delayed spread signal by a tap coefficient of the communication channel based on the spread code of the communication channel. A communication channel orthogonalization filter that includes a multiplier and an adder that adds an output of the multiplier, and that despreads the spread signal of the communication channel and outputs a despread signal of the communication channel; A communication channel phase error compensator for compensating a reception phase of each information symbol in the information signal included in the despread signal based on a reception phase of the corresponding reception pilot symbol; and calculating a tap coefficient of the communication channel. And a communication channel tap coefficient control means for supplying the communication channel quadrature filter, wherein the demodulation circuit comprises: The communication channel tap coefficient control unit further includes an identification determination unit that identifies and determines the information symbol whose phase has been compensated, wherein the communication channel tap coefficient control unit compares the information symbol whose phase has been compensated with the information symbol whose identification has been determined. A CDMA transmission system comprising calculating the tap coefficient that minimizes the mean square error of the error. 18. A spread signal is generated by spreading an information signal into a wideband signal with a spreading code faster than the transmission rate, and communication between a base station and a mobile station is performed using the spread signal. CDMA (Code Division Mult) performed by multiple access transmission
In the iple Access) transmission system, a downlink channel from the base station to the mobile station includes at least one pilot channel composed of only a pilot signal having a known pattern, and a plurality of communication channels for transmitting the information signal. A demodulation circuit of a receiving device of the mobile station, a pilot channel demodulation unit for demodulating the pilot channel for each path, and a communication for demodulating the communication channel, the communication channel being provided for each communication channel. A channel demodulator, wherein the pilot channel demodulator is 1 / m (m is an integer of 1 or more) of a chip period of the spreading code.
A plurality of delay circuits for sequentially giving the delay of the pilot channel to the spread signal of the pilot channel, and a plurality of delay circuits for multiplying the spread signal of the pilot channel and the delayed spread signal by a tap coefficient of the pilot channel based on the spread code of the pilot channel. A pilot channel matched filter for despreading the spread signal of the pilot channel to output a despread signal of the pilot channel, and a multiplier for adding the output of the multiplier. A received pilot signal included in the despread signal and a pilot signal of a known pattern are compared, a reception phase of each reception pilot symbol in the reception pilot signal is estimated, and a signal obtained by averaging the reception phase, Phase error extraction / average for obtaining an error with the received pilot symbol And a communication channel demodulation unit, wherein 1 / m (m is an integer of 1 or more) of a chip period of the spreading code.
A plurality of delay circuits for sequentially giving the delay of the communication channel to the spread signal of the communication channel, and a plurality of delay circuits for multiplying the communication channel spread signal and the delayed spread signal by a tap coefficient of the communication channel based on a spread code of the communication channel. A communication channel orthogonalization filter that includes a multiplier and an adder that adds an output of the multiplier, and that despreads the spread signal of the communication channel and outputs a despread signal of the communication channel; A communication channel phase error compensator for compensating a reception phase of each information symbol in the information signal included in the despread signal based on a reception phase of the corresponding reception pilot symbol; and calculating a tap coefficient of the communication channel. And a communication channel tap coefficient control means for supplying to the communication channel orthogonalization filter, Further, RAKE combining by multiplying the weighting factor the said Pairoto signal compensated for the phase for each path and to said information symbol
A RAKE combining circuit, and identification determining means for identifying and identifying the RAKE-combined signal, wherein the communication channel tap coefficient control means for each path includes an output of the communication channel phase error compensation means for each path. ,
A CDMA transmission system, wherein the tap coefficient for minimizing a mean square error of an error between a signal obtained by allocating an output of the discrimination determination means and a power by a weight coefficient of the RAKE combination is calculated. 19. A spread signal is generated by spreading an information signal into a wideband signal with a spreading code faster than its transmission rate, and communication between a base station and a mobile station is performed using the spread signal. CDMA (Code Division Mult) performed by multiple access transmission
In the iple Access) transmission system, a downlink channel from the base station to the mobile station includes at least one pilot channel composed of only a pilot signal having a known pattern, and a plurality of communication channels for transmitting the information signal. And a demodulation circuit of the receiving device of the mobile station, a pilot channel demodulation unit for demodulating the pilot channel for each path, and a communication channel for demodulating the communication channel provided in each of the communication channels. A demodulation unit, wherein the pilot channel demodulation unit is 1 / m (m is an integer of 1 or more) of a chip period of the spreading code.
A plurality of delay circuits for sequentially giving the delay of the pilot channel to the spread signal of the pilot channel, and a plurality of delay circuits for multiplying the spread signal of the pilot channel and the delayed spread signal by a tap coefficient of the pilot channel based on the spread code of the pilot channel. A pilot channel matched filter for despreading the spread signal of the pilot channel to output a despread signal of the pilot channel, and a multiplier for adding the output of the multiplier. A received pilot signal included in the despread signal and a pilot signal of a known pattern are compared, a reception phase of each reception pilot symbol in the reception pilot signal is estimated, and a signal obtained by averaging the reception phase, Phase error extraction / average for obtaining an error with the received pilot symbol And a communication channel demodulation unit, wherein 1 / m (m is an integer of 1 or more) of a chip period of the spreading code.
A plurality of delay circuits for sequentially giving the delay of the communication channel to the spread signal of the communication channel; and a plurality of delay circuits for multiplying the spread signal of the communication channel and the delayed spread signal by a tap coefficient of the communication channel based on the spread code of the communication channel. A communication channel orthogonalization filter for despreading the spread signal of the communication channel to output a despread signal of the communication channel, the multiplier comprising: A communication channel phase error compensating means for compensating the reception phase of each information symbol in the information signal included in the despread signal based on the reception phase of the corresponding reception pilot symbol; and a tap coefficient of the communication channel. A communication channel tap coefficient control means for calculating and supplying the communication channel tap coefficient to the communication channel orthogonalization filter; , Further RAKE combining by multiplying the weighting factor the said Pairoto signal compensated for the phase for each path and to said information symbol
A RAKE combining circuit, and identification determining means for identifying and identifying the RAKE-combined signal, wherein the communication channel tap coefficient control means for each path includes an output of the communication channel phase error compensation means for each path. ,
A CDMA transmission system, wherein the tap coefficient for minimizing a mean square error of an error between a signal obtained by allocating an output of the discrimination determination means and a power by a weight coefficient of the RAKE combination is calculated. 20. The CDMA transmission system according to claim 16, wherein a period of said spreading code is the same as an information symbol period in said information signal. 21. A spread signal is generated by spreading a signal having a frame composed of a pilot signal of a known pattern and an information signal into a wideband signal with a spreading code faster than each information symbol in the information signal; Perform multiple access transmission
A demodulation method used in CDMA (Code Division Multiple Access) transmission for demodulating the spread signal using the spreading code, wherein 1 / m (m is an integer of 1 or more) of a chip period of the spreading code.
Is sequentially given to the spread signal, the spread signal and the delayed spread signal are multiplied by a tap coefficient based on the spreading code, the multiplication result is added, and the spread signal is despread, Outputting a signal, the received pilot signal included in the despread signal, and comparing the pilot signal of a known pattern, while estimating the received phase of the received pilot signal, and interpolating the received phase An absolute phase estimation step of estimating a reception phase of each information symbol in the information signal, and compensating for a reception phase error of the reception pilot signal based on the estimated reception phase of the reception pilot signal; A phase error compensation step of compensating for a phase error of the information symbol based on the received reception phase of the information symbol, An identification determining step of identifying the compensated pilot signal and the information symbol whose phase has been compensated, and minimizing a mean square error of an error between an output of the phase error compensation step and an output of the identification determining step. A tap coefficient calculating step of calculating a tap coefficient. 22. The tap coefficient calculating step calculates a tap coefficient for minimizing the mean square error for each symbol in the pilot signal, and calculates the tap coefficient for each symbol in the information signal. 22. The method according to claim 21, wherein a tap coefficient for minimizing a square error is calculated.
CDMA demodulation method described in section. 23. The CDMA demodulation method according to claim 21, wherein said tap coefficient calculating step calculates a tap coefficient for minimizing said mean square error for each said pilot signal. 24. The tap coefficient calculating step calculates a tap coefficient for minimizing the mean square error for each pilot signal, and calculates the mean square error for each symbol in the information signal. The CDMA according to claim 21, wherein a tap coefficient to be minimized is calculated.
Demodulation method. 25. A downlink channel from a base station to a mobile station,
At least one pilot channel composed only of a pilot signal having a known pattern, and a plurality of communication channels for transmitting an information signal, wherein the pilot signal and the information signal are spread over a wide band with a spreading code faster than its transmission rate. Generate a spread signal by spreading the signal, the communication between the base station and the mobile station using the spread signal,
CDMA (Code Division Multiple) using multiple access transmission
Access) A demodulation method of a receiving device of the mobile station used in a transmission system, wherein 1 / m (m is an integer of 1 or more) of a chip period of the spreading code.
Is sequentially given to the spread signal of the pilot channel, the spread signal of the pilot channel and the delayed spread signal are multiplied by a tap coefficient of the pilot channel based on the spread code of the pilot channel, and the multiplication result is added. Despreading the spread signal of the pilot channel and outputting a despread signal of the pilot channel; anda receiving pilot signal included in the despread signal of the pilot channel and a pilot signal of a known pattern. Comparing, estimating the reception phase of each received pilot symbol in the received pilot signal, a signal obtained by averaging the received phase, and a phase error extraction and averaging step of obtaining a phase error between the received pilot symbol, A signal obtained by averaging the reception phase and the reception pilot symbol Wherein the step of calculating the tap coefficients of the pilot channel, 1 / m of a chip period of the spread code of the mean square error of the phase error to minimize the (m is an integer of 1 or more)
Are sequentially given to the spread signal of the communication channel, the communication channel spread signal and the delayed spread signal are multiplied by a tap coefficient of the communication channel based on the spread code of the communication channel, and the multiplication result is added. Despreading the spread signal of the communication channel and outputting a despread signal of the communication channel; anda receiving phase of each information symbol in the information signal included in the despread signal of the communication channel, A communication channel phase error compensation step for compensating based on a reception phase of the corresponding reception pilot symbol; an identification determination step for identifying the information symbol whose phase has been compensated; and the phase compensated information symbol. A step of calculating the tap coefficient for minimizing a mean square error of an error with the information symbol determined and identified; CDMA demodulation method characterized by comprising and. 26. A downlink channel from a base station to a mobile station,
At least one pilot channel composed only of a pilot signal having a known pattern, and a plurality of communication channels for transmitting an information signal, wherein the pilot signal and the information signal are spread over a wide band with a spreading code faster than its transmission rate. Generate a spread signal by spreading the signal, the communication between the base station and the mobile station using the spread signal,
CDMA (Code Division Multiple) using multiple access transmission
Access) A demodulation method for a receiving device of the mobile station, used in a transmission system, wherein a delay of 1 / m (m is an integer of 1 or more) of a chip period of the spreading code is added to a spreading signal of the pilot channel. Sequentially given, multiply the spread signal of the pilot channel and the delayed spread signal by the tap coefficient of the pilot channel based on the spread code of the pilot channel, and add the multiplication result to obtain the spread signal of the pilot channel. Despreading and outputting a despread signal of the pilot channel; and comparing a received pilot signal included in the despread signal of the pilot channel with a pilot signal of a known pattern, A reception phase of each reception pilot symbol is estimated, and a signal obtained by averaging the reception phases and the reception pilot symbol. A phase error extraction and averaging step for obtaining an error with respect to the symbol, and 1 / m of the chip period of the spread code (m is an integer of 1 or more)
Is sequentially given to the spread signal of the communication channel, the communication channel spread signal and the delayed spread signal are multiplied by a tap coefficient of the communication channel based on the spread code of the communication channel, and the multiplication result is added. Despreading the spread signal of the communication channel and outputting a despread signal of the communication channel; anda receiving phase of each information symbol in the information signal included in the despread signal of the communication channel, A communication channel phase error compensation step for compensating based on a reception phase of the corresponding reception pilot symbol; an identification decision step for identifying and discriminating the phase-compensated information symbol; and the phase-compensated information symbol. A step of calculating the tap coefficient for minimizing a mean square error of an error with the information symbol determined and identified; CDMA demodulation method characterized by comprising and. 27. A spread signal is generated by spreading a signal having a frame consisting of a pilot signal of a known pattern and an information signal into a wideband signal with a spreading code faster than each information symbol in the information signal; Perform multiple access transmission
A demodulation method for demodulating, using the spreading code, the spread signal used in CDMA (Code Division Multiple Access) transmission and propagated through multipaths, wherein for each path, one of chip periods of the spreading code is used. / m (m is an integer of 1 or more)
Are sequentially given to the spread signal, the spread signal and the delayed spread signal are multiplied by a tap coefficient based on the spread code, the multiplication result is added, and the spread signal is despread, and the spread signal is despread. The step of outputting a received pilot signal included in the despread signal and a pilot signal of a known pattern, while estimating the reception phase of the reception pilot signal, and interpolating the reception phase, Absolute phase estimation step of estimating the reception phase of each information symbol in the information signal, Based on the estimated reception phase of the reception pilot signal, compensates the reception phase error of the reception pilot signal, and A phase error compensation step of compensating for a phase error of the information symbol based on a reception phase of the information symbol; A RAKE combining step of performing a RAKE combining by multiplying the phase compensated pilot signal and the information symbol by a weighting coefficient, an identification determining step of identifying and determining the RAKE combined signal, and the phase error compensation of each path. A tap coefficient calculating step of calculating the tap coefficient for minimizing a mean square error of an error between an output of the means and an output of the discrimination determining means with a signal obtained by power distribution using the weighting coefficient of RAKE combining. Characteristic CDMA demodulation method. 28. The tap coefficient calculating step calculates the tap coefficient for minimizing the mean square error for each symbol in the pilot signal, and calculates the tap coefficient for each symbol in the information signal. 28. The CDMA demodulation method according to claim 27, wherein the tap coefficient that minimizes a mean square error is calculated. 29. The CDMA demodulation method according to claim 27, wherein said tap coefficient calculating step calculates a tap coefficient for minimizing said mean square error for each said pilot signal. 30. The tap coefficient calculating step calculates a tap coefficient for minimizing the mean square error for each pilot signal, and calculates the mean square error for each symbol in the information signal. The CDMA according to claim 27, wherein a tap coefficient to be minimized is calculated.
Demodulation method. 31. The method according to claim 31, wherein the weighting factor is a reception SIR of each path.
28. The CDMA demodulation method according to claim 27, wherein (signal power to interference power ratio). 32. A downlink channel from a base station to a mobile station,
At least one pilot channel composed only of a pilot signal having a known pattern, and a plurality of communication channels for transmitting an information signal, wherein the pilot signal and the information signal are spread over a wide band with a spreading code faster than its transmission rate. Generate a spread signal by spreading the signal, the communication between the base station and the mobile station using the spread signal,
CDMA (Code Division Multiple) using multiple access transmission
Access) A demodulation method for demodulating, using the spreading code, the spread signal used in a transmission system and propagated through multipaths, wherein for each path, 1 / m (m Is an integer of 1 or more)
Are sequentially given to the spread signal of the pilot channel, the spread signal of the pilot channel and the delayed spread signal are multiplied by a tap coefficient of the pilot channel based on the spread code of the pilot channel, and the multiplication result is added. Despreading the spread signal of the pilot channel and outputting a despread signal of the pilot channel; anda receiving pilot signal included in the despread signal of the pilot channel and a pilot signal of a known pattern. Comparing, estimating the reception phase of each received pilot symbol in the received pilot signal, a signal obtained by averaging the received phase, and a phase error extraction and averaging step of obtaining a phase error between the received pilot symbol, A signal obtained by averaging the reception phase and the reception pilot symbol Wherein the step of calculating the tap coefficients of the pilot channel, 1 / m of a chip period of the spread code of the mean square error of the phase error to minimize the (m is an integer of 1 or more)
Are sequentially given to the spread signal of the communication channel, the communication channel spread signal and the delayed spread signal are multiplied by a tap coefficient of the communication channel based on the spread code of the communication channel, and the multiplication result is added. Despreading the spread signal of the communication channel, and outputting a despread signal of the communication channel;
A communication channel phase error compensation step for compensating a reception phase of each information symbol in the information signal included in the despread signal of the communication channel based on a reception phase of the corresponding reception pilot symbol; A RAKE combining step of multiplying the information symbol whose phase has been compensated for by a weighting factor, an identification determining step of identifying a RAKE-combined signal, and the communication channel phase error compensating means of each path. And a tap coefficient for minimizing a mean square error of an error between a signal obtained by distributing the discrimination result and the RAKE combining power with the weighting coefficient of the RAKE combination. . 33. The weighting factor is defined as a reception SIR of each path.
33. The CDMA demodulation method according to claim 32, wherein (signal power to interference power ratio). 34. A downlink channel from a base station to a mobile station,
At least one pilot channel composed only of a pilot signal having a known pattern, and a plurality of communication channels for transmitting an information signal, wherein the pilot signal and the information signal are spread over a wide band with a spreading code faster than its transmission rate. Generate a spread signal by spreading the signal, the communication between the base station and the mobile station using the spread signal,
CDMA (Code Division Multiple) using multiple access transmission
Access) A demodulation method for demodulating, using the spreading code, the spread signal used in a transmission system and propagated through multipaths, wherein for each path, 1 / m (m Is an integer of 1 or more)
Are sequentially given to the spread signal of the pilot channel, the spread signal of the pilot channel and the delayed spread signal are multiplied by a tap coefficient of the pilot channel based on the spread code of the pilot channel, and the multiplication result is added. Despreading the spread signal of the pilot channel and outputting a despread signal of the pilot channel; anda receiving pilot signal included in the despread signal of the pilot channel and a pilot signal of a known pattern. Comparing, estimating the reception phase of each reception pilot symbol in the reception pilot signal, averaging the reception phase, and a phase error extraction and averaging step of obtaining an error between the reception pilot symbol; 1 / m of the chip period of the spreading code (m is an integer of 1 or more)
Are sequentially given to the spread signal of the communication channel, the communication channel spread signal and the delayed spread signal are multiplied by a tap coefficient of the communication channel based on the spread code of the communication channel, and the multiplication result is added. Despreading the spread signal of the communication channel, and outputting a despread signal of the communication channel; anda receiving phase of each information symbol in the information signal included in the despread signal of the communication channel, A communication channel phase error compensation step of compensating based on the reception phase of the corresponding reception pilot symbol, and a RAKE combination step of performing a RAKE combination by multiplying the information symbol whose phase has been compensated for each path by a weight coefficient. An identification determining step of identifying the RAKE-combined signal; and an output of the communication channel phase error compensating means of each path. And a tap coefficient for minimizing a mean square error of an error between a signal obtained by distributing the output of the discrimination determination means and the power by the RAKE combining weighting factor. . 35. The method according to claim 35, wherein the weighting factor is a reception SIR of each path.
35. The CDMA demodulation method according to claim 34, wherein (signal power to interference power ratio). 36. A spread signal is generated by spreading an information signal into a wideband signal with a spreading code faster than its transmission rate, and communication between a base station and a mobile station is performed using the spread signal. CDMA (CodeDivision Multi) using multiple access transmission
ple Access) a transmission method comprising: transmitting only a pilot signal of a known pattern from the base station to the mobile station through at least one pilot channel; and transmitting the information signal through a plurality of communication channels. The demodulation method of the receiving device of the mobile station is as follows: 1 / m (m is an integer of 1 or more) of the chip period of the spreading code.
Is sequentially given to the spread signal of the pilot channel, the spread signal of the pilot channel and the delayed spread signal are multiplied by a tap coefficient of the pilot channel based on the spread code of the pilot channel, and the multiplication result is added. Despreading the spread signal of the pilot channel and outputting a despread signal of the pilot channel; anda receiving pilot signal included in the despread signal of the pilot channel and a pilot signal of a known pattern. Comparing, estimating the reception phase of each received pilot symbol in the received pilot signal, a signal obtained by averaging the received phase, and a phase error extraction and averaging step of obtaining a phase error between the received pilot symbol, A signal obtained by averaging the reception phase and the reception pilot symbol The pilot channel tap coefficient calculation step of calculating the tap coefficients of the pilot Virtual, 1 / m of a chip period of the spread code for minimizing the mean square error of the phase error between the (m is an integer of 1 or more)
Is sequentially given to the spread signal of the communication channel, the communication channel spread signal and the delayed spread signal are multiplied by a tap coefficient of the communication channel based on the spread code of the communication channel, and the multiplication result is added. Despreading the spread signal of the communication channel and outputting a despread signal of the communication channel; anda receiving phase of each information symbol in the information signal included in the despread signal of the communication channel, A communication channel phase error compensation step for compensating based on a reception phase of the corresponding reception pilot symbol; an identification decision step for identifying and discriminating the phase-compensated information symbol; and the phase-compensated information symbol. Calculating a tap coefficient that minimizes a mean square error of an error with the information symbol determined and identified; A CDMA transmission method, comprising: 37. An information signal is spread into a wideband signal with a spreading code faster than its transmission rate to generate a spread signal, and communication between a base station and a mobile station is performed using the spread signal. CDMA (CodeDivision Multi) using multiple access transmission
ple Access) a transmission method comprising: transmitting only a pilot signal of a known pattern from the base station to the mobile station through at least one pilot channel; and transmitting the information signal through a plurality of communication channels. The demodulation method of the receiving device of the mobile station is as follows: 1 / m (m is an integer of 1 or more) of the chip period of the spreading code.
Are sequentially given to the spread signal of the pilot channel, the spread signal of the pilot channel and the delayed spread signal are multiplied by a tap coefficient of the pilot channel based on the spread code of the pilot channel, and the multiplication result is added. Despreading the spread signal of the pilot channel and outputting a despread signal of the pilot channel; anda receiving pilot signal included in the despread signal of the pilot channel and a pilot signal of a known pattern. Comparing, estimating the reception phase of each reception pilot symbol in the reception pilot signal, averaging the reception phase, and a phase error extraction and averaging step of obtaining an error between the reception pilot symbol; 1 / m of the chip period of the spreading code (m is an integer of 1 or more)
Is sequentially given to the spread signal of the communication channel, the communication channel spread signal and the delayed spread signal are multiplied by a tap coefficient of the communication channel based on the spread code of the communication channel, and the multiplication result is added. Despreading the spread signal of the communication channel and outputting a despread signal of the communication channel; anda receiving phase of each information symbol in the information signal included in the despread signal of the communication channel, A communication channel phase error compensation step for compensating based on a reception phase of the corresponding reception pilot symbol; an identification determination step for identifying the information symbol whose phase has been compensated; and the phase compensated information symbol. Calculating a tap coefficient that minimizes a mean square error of an error with the information symbol determined and identified; CDMA transmission method characterized by comprising. 38. A spread signal is generated by spreading an information signal into a wideband signal with a spreading code faster than the transmission rate, and communication between a base station and a mobile station is performed using the spread signal. CDMA (CodeDivision Multi) using multiple access transmission
ple Access) a transmission method comprising: transmitting only a pilot signal of a known pattern from the base station to the mobile station through at least one pilot channel; and transmitting the information signal through a plurality of communication channels. The demodulation method of the receiving device of the mobile station includes, for each path, 1 / m (m is an integer of 1 or more) of the chip period of the spreading code.
Are sequentially given to the spread signal of the pilot channel, the spread signal of the pilot channel and the delayed spread signal are multiplied by a tap coefficient of the pilot channel based on the spread code of the pilot channel, and the multiplication result is added. Despreading the spread signal of the pilot channel and outputting a despread signal of the pilot channel; anda receiving pilot signal included in the despread signal of the pilot channel and a pilot signal of a known pattern. Comparing, estimating the reception phase of each received pilot symbol in the received pilot signal, a signal obtained by averaging the received phase, and a phase error extraction and averaging step of obtaining a phase error between the received pilot symbol, A signal obtained by averaging the reception phase and the reception pilot symbol Wherein the step of calculating the tap coefficients of the pilot channel, 1 / m of a chip period of the spread code of the mean square error of the phase error to minimize the (m is an integer of 1 or more)
Are sequentially given to the spread signal of the communication channel, the communication channel spread signal and the delayed spread signal are multiplied by a tap coefficient of the communication channel based on the spread code of the communication channel, and the multiplication result is added. Despreading the spread signal of the communication channel and outputting a despread signal of the communication channel; anda receiving phase of each information symbol in the information signal included in the despread signal of the communication channel. A communication channel phase error compensation step for compensating based on the reception phase of the corresponding reception pilot symbol, and performing RAKE combining by multiplying the phase-compensated pilot signal and the information symbol weighting coefficient for each path.
A RAKE combining step; an identification determining step of identifying and determining the RAKE-combined signal; an output obtained in the communication channel phase error compensation step of each path; and an output obtained in the identification determining step.
Average of error from signal distributed by weight coefficient of KE combination 2
Calculating a tap coefficient that minimizes a power error. 39. An information signal is spread into a wideband signal with a spreading code faster than its transmission rate to generate a spread signal, and communication between the base station and the mobile station is performed using the spread signal. CDMA (CodeDivision Multi) using multiple access transmission
ple Access) a transmission method comprising: transmitting only a pilot signal of a known pattern from the base station to the mobile station through at least one pilot channel; and transmitting the information signal through a plurality of communication channels. The demodulation method of the receiving device of the mobile station includes, for each path, 1 / m (m is an integer of 1 or more) of the chip period of the spreading code.
Are sequentially given to the spread signal of the pilot channel, the spread signal of the pilot channel and the delayed spread signal are multiplied by a tap coefficient of the pilot channel based on the spread code of the pilot channel, and the multiplication result is added. Despreading the spread signal of the pilot channel and outputting a despread signal of the pilot channel; anda receiving pilot signal included in the despread signal of the pilot channel and a pilot signal of a known pattern. Comparing, estimating the reception phase of each reception pilot symbol in the reception pilot signal, averaging the reception phase, and a phase error extraction and averaging step of obtaining an error between the reception pilot symbol; 1 / m of the chip period of the spreading code (m is an integer of 1 or more)
Is sequentially given to the spread signal of the communication channel, the communication channel spread signal and the delayed spread signal are multiplied by a tap coefficient of the communication channel based on the spread code of the communication channel, and the multiplication result is added. Despreading the spread signal of the communication channel and outputting a despread signal of the communication channel; anda receiving phase of each information symbol in the information signal included in the despread signal of the communication channel, A communication channel phase error compensation step for compensating based on the reception phase of the corresponding reception pilot symbol, and RAKE combining by multiplying the phase-compensated pilot signal and the information symbol weighting coefficient for each path.
A RAKE combining step, an identification determining step of identifying and determining the RAKE-combined signal, an output of the communication channel phase error compensating means of each path, and an output of the identification determining means as a power by a weight coefficient of the RAKE combining. Calculating a tap coefficient that minimizes a mean square error of an error with the distributed signal. 40. The CDMA transmission method according to claim 36, wherein a period of said spreading code is the same as an information symbol period in said information signal.