JP2004364320A - Despreading apparatus, propagation line estimation apparatus, receiver, interference suppressing apparatus, despreading, propagation line estimation, reception and interference suppressing method, program for them, and recording medium with the program recorded thereon - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receiver that needs not always operate the function corresponding to a mode (64QAM) most sensitive to deterioration in precision in an adaptive modulation communication. <P>SOLUTION: A controller 104 reads a demodulation method from a control signal specifying the demodulation method (QPSK, 16-QAM, 64-QAM) and controls the sampling rate in an analog/digital converter 111 and a despreader 102, the number of pilot symbols used by a propagation path estimation block 106 and the number of pilot symbols inversely spread by the despreader 102. Thus, when the demodulation method is other than the 64-QAM, the controller can set the sampling rate or the like matching the QPSK or the 16-QAM so that there is no need of operating the function corresponding to the 64-QAM at all times. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to control of receiver parameters such as an A / D conversion speed and a propagation path estimation method.

  Conventionally, the coding rate of the error correction code and the multi-level modulation degree are changed according to the propagation path quality, and high-speed data communication is provided to a user having a good propagation path quality while sacrificing noise durability characteristics. For users with poor propagation path quality, there is an adaptive modulation / coding rate communication system that emphasizes noise durability characteristics and provides low-speed data communication.

  Communication systems using such applied modulation have recently been introduced into wireless communication systems, and examples include GSM EDGE and HDR. It is expected that a similar scheme will be additionally adopted in W-CDMA.

  An example of the adaptive modulation / coding rate communication system will be described with reference to Table 1 below.

まず、受信機は、受信データの品質を示す受信品質データを基地局に送信する。基地局は、受信品質データを四段階（モード０−３）に分類する。モード０のとき品質が最も劣化し、モード３のとき品質が最も良好である。ここで、基地局は、受信品質データのモードに基づき、表１に示すように符号化方式および変調方式を定める。

First, the receiver transmits reception quality data indicating the quality of the reception data to the base station. The base station classifies the reception quality data into four levels (modes 0-3). In mode 0, the quality is the most degraded, and in mode 3, the quality is the best. Here, the base station determines an encoding scheme and a modulation scheme as shown in Table 1 based on the mode of the reception quality data.

  In Table 1, there are R = 1/2 and R = 3/4 encoding in the encoding method, but the encoding unit of R = 1/2 adds one redundant bit for each input data bit. Means that. The encoding unit of R = 3/4 means that one redundant bit is added to three bits of input data. Modulation methods include well-known QPSK, 16-QAM, and 64-QAM.

Here, the relationship of the data transfer amount is a (R = 1/2,
QPSK) <b (R = 1/2, 16QAM) <c (R = 3/4, 16QAM) <d (R = 3/4, 64QAM), while the relationship of noise immunity is a>b>c> d. As described above, the relationship between the data transfer amount and the relationship between the noise immunity characteristics are opposite.

  Therefore, if the coding method and the modulation method are determined as shown in Table 1, communication with high noise tolerance characteristics can be performed in mode 0 where the quality is most deteriorated. Further, in Mode 3 where the quality is the best, communication with a large data transfer amount can be performed.

  Here, in the above-described conventional techniques, a receiver transmits reception quality data to a base station, and the base station selects an optimal combination of a modulation scheme and an encoding scheme based on the reception quality data. For this reason, it is necessary for the receiver to maintain good reception characteristics in all combinations of the modulation scheme and the encoding scheme supported by the base station.

  Among the modulation schemes QPSK, 16-QAM, and 64-QAM, 64-QAM is greatly affected by a reception timing shift, a synchronous detection error, and the like. FIG. 12 is a graph comparing the influence of the reception timing shift with each modulation scheme. 64-QAM is most affected by the reception timing shift. FIG. 13 is a graph comparing the effects of each modulation scheme and the synchronous detection error. 64-QAM is most affected by the reception timing shift.

  Also, when the modulation scheme is 64-QAM or 16-QAM, it is vulnerable to multipath interference unique to a mobile communication environment. Therefore, when the modulation scheme is 64-QAM or 16-QAM, it is necessary to suppress interference using an interference canceller or an equalizer in order to perform efficient communication.

  Therefore, for a receiver that supports the adaptive modulation and coding rate communication system, it is necessary to design a sophisticated function in accordance with the mode (64-QAM) that is most sensitive to the deterioration of the accuracy of each reception function (such as reception timing deviation). is there.

  However, such advanced functions are useless when receiving in a mode insensitive to accuracy deterioration.

  Generally, to perform high-accuracy reception processing, it is necessary to speed up signal processing, and power consumption is increased. Therefore, in a mobile terminal such as a mobile phone that requires low power consumption, it is required to operate only the minimum functions required for reception. Therefore, there is a problem that it is impractical to always operate a functional block designed for the 64-QAM mode.

  Accordingly, it is an object of the present invention to provide a communication device or the like which does not need to constantly operate a function corresponding to a mode most sensitive to accuracy degradation in adaptive modulation communication.

  The present invention relates to a despreading device. A despreading device according to the present invention receives a spread reception signal. A despreading device according to the present invention includes a receiving unit, a despreading unit, a sample rate supply unit, and a control unit.

  The receiving means receives a received signal having a control signal designating a demodulation method. The despreading means despreads the received signal based on the sample rate and outputs a control signal. The sample rate supply means gives a sample rate to the despreading means. The control means controls the sample rate based on the control signal.

  According to the invention configured as described above, the control means controls the sample rate of the despreading means based on the control signal designating the demodulation method. As a result, the sample rate can be appropriately reduced according to the demodulation method, and the function (high-speed sample rate) corresponding to the demodulation method most sensitive to the accuracy deterioration does not need to be constantly operated.

  The invention also relates to a propagation path estimation device. A propagation path estimation device according to the present invention receives a spread reception signal. A propagation path estimation device according to the present invention includes a receiving unit, a despreading unit, a propagation path estimation unit, and a control unit.

  The receiving means receives a pilot signal and a received signal having a control signal designating a demodulation method. The despreading means despreads the received signal and outputs a pilot signal and a control signal. The propagation path estimating means obtains the amount of phase rotation of the received signal based on the pilot signal. The control means controls the length of the pilot signal used by the propagation path estimation means based on the control signal.

  According to the invention configured as described above, the control unit controls the length of the pilot signal used by the propagation path estimation unit based on the control signal designating the demodulation method. Thereby, the length of the pilot signal used by the propagation path estimating means can be appropriately increased according to the demodulation method, and the function corresponding to the demodulation method most sensitive to the accuracy deterioration (the length of the pilot signal to be used is It is not necessary to always operate the function of shortening).

  Furthermore, the invention relates to a despreading device. A despreading device according to the present invention receives a spread reception signal. A despreading device according to the present invention includes a receiving unit, a despreading unit, and a control unit.

  The receiving means receives a pilot signal and a received signal having a control signal designating a demodulation method. The despreading means despreads the received signal and outputs a pilot signal and a control signal. The control means controls the length of the pilot signal to be despread by the despreading means based on the control signal.

  According to the invention configured as described above, the control means controls the length of the despread pilot signal based on the control signal designating the demodulation method. Accordingly, the length of the pilot signal to be despread according to the demodulation method can be appropriately increased, and the function corresponding to the demodulation method most sensitive to accuracy deterioration (reducing the length of the despread pilot signal). Function) need not always be operated.

  The invention as described above can be applied to a receiving device.

  Furthermore, the invention relates to a despreading device. A despreading device according to the present invention receives a spread reception signal. A despreading device according to the present invention includes a receiving unit, a despreading unit, a sample rate supply unit, and a control unit.

  The receiving means receives the received signal. The despreading means despreads and outputs the received signal based on the sample rate. The sample rate supply means gives a sample rate to the despreading means. The control means controls the sample rate based on the type of the received signal.

  According to the invention configured as described above, the control unit controls the sample rate based on the type of the received signal, so that the control unit controls the sample rate of the despreading unit based on the control signal specifying the demodulation method. It has the same effect as in the case.

  Further, the present invention relates to a propagation path estimation device. A propagation path estimation device according to the present invention receives a spread reception signal. A propagation path estimation device according to the present invention includes a receiving unit, a despreading unit, a propagation path estimation unit, and a control unit.

  The receiving means receives a received signal having a pilot signal. The despreading means despreads the received signal and outputs a pilot signal. The propagation path estimating means obtains the amount of phase rotation of the received signal based on the pilot signal. The control means controls the length of the pilot signal used by the propagation path estimation means based on the type of the received signal.

  According to the invention configured as described above, the control unit controls the length of the pilot signal used by the propagation path estimation unit based on the type of the received signal, thereby controlling the pilot signal based on the control signal designating the demodulation method. This has the same effect as the case where the means controls the length of the pilot signal used by the propagation path estimation means.

  Furthermore, the invention relates to a despreading device. A despreading device according to the present invention receives a spread reception signal. A despreading device according to the present invention includes a receiving unit, a despreading unit, and a control unit.

  The receiving means receives a received signal having a pilot signal. The despreading means despreads the received signal and outputs a pilot signal. The control means controls the length of the pilot signal to be despread by the despreading means based on the type of the received signal.

  According to the invention configured as described above, the control unit controls the length of the pilot signal to be despread based on the type of the received signal, so that the control unit despreads based on the control signal specifying the demodulation method. The same effect as in the case of controlling the length of the pilot signal to be performed can be obtained.

  Further, the present invention relates to an interference suppression device. An interference suppression apparatus according to the present invention receives a spread reception signal. An interference suppression apparatus according to the present invention includes a reception unit, an interference suppression unit, a despreading unit, and a control unit.

  The receiving means receives a received signal having a control signal designating a demodulation method. The interference suppression unit suppresses interference of the received signal. The despreading means despreads the output of the interference suppression means and outputs a control signal. The control means controls the interference suppression means based on the control signal.

  According to the invention configured as described above, the control unit controls the interference suppression unit based on the control signal. Thus, the operation of the interference suppression unit can be controlled according to the demodulation method, and the function corresponding to the demodulation method most sensitive to the accuracy deterioration does not need to be constantly operated.

  Further, the present invention relates to an interference suppression device. An interference suppression apparatus according to the present invention receives a spread reception signal. An interference suppression apparatus according to the present invention includes a reception unit, an interference suppression unit, a despreading unit, and a control unit.

  The receiving means receives the received signal. The interference suppression unit suppresses interference of the received signal. The despreading means despreads the output of the interference suppression means and outputs the result. The control unit controls the interference suppression unit based on the type of the received signal.

  According to the invention configured as described above, the control unit controls the interference suppression unit based on the type of the received signal, thereby providing the same effect as the control unit controlling the interference suppression unit based on the control signal. .

  The invention as described above can be applied to a receiving device.

  Before describing the embodiments of the present invention, an adaptive modulation communication system on which the embodiments of the present invention are based will be described.

  FIG. 1 is a block diagram showing a configuration of a base station of the adaptive modulation communication system. The base station includes a transmission / reception sharing device 1101, a despreading unit 1102, a demodulation unit 1103, a reception quality bit extraction unit 1104, a control unit 1105, a control data generation unit 1106, a coding / modulation unit 1107, a spreading unit 1108, an adaptive coding / A modulation section 1109 and a D / A conversion section 1110 are provided.

  The transmission / reception sharing device 1101 receives a reception quality data signal transmitted from a user terminal described later. The reception quality data signal indicates the quality of the signal received by the user terminal from the base station. The reception quality data signal is spread and modulated in the user terminal. In addition, transmission / reception sharing device 1101 transmits the signal output from D / A conversion section 1110 to the user terminal.

  Despreading section 1102 despreads and outputs the reception quality data signal. Demodulation section 1103 demodulates and outputs the output of despreading section 1102. As a result, the state returns to the state before spreading and modulation of the reception quality data signal are performed. Reception bit extraction section 1104 extracts the quality (referred to as reception quality data) of the signal received by the user terminal from the base station from the reception quality data signal.

  The control unit 1105 determines a coding method for coding communication target data, a control signal, and a pilot signal to be transmitted to the user terminal, and a modulation method for modulating, according to the extracted reception quality data.

  Here, in order to simplify the explanation, four combinations shown in Table 2 are selected.

表２において符号化方式にはR=1/2とR=3/4の符号化がある。R=1/2の符号化部は入力データ１ビットにつき1ビットの冗長ビットが付加されることを意味する。R=3/4の符号化部は入力データ3ビットにつき1ビットの冗長ビットが付加されることを意味する。

In Table 2, R = 1/2 and R = 3/4 are coding methods. An encoding unit of R = 1/2 means that one redundant bit is added to one bit of input data. The encoding unit of R = 3/4 means that one redundant bit is added to three bits of input data.

  The code of R = 1/2 has a high error correction capability due to the large number of redundant bits, but the number of transmittable communication target data decreases. On the other hand, although the code error correction capability of R = 3/4 is inferior to that of R = 1/2, the transmittable communication target data can be increased.

  The modulation scheme includes QPSK, 16-QAM, and 64-QAM. FIG. 2 shows a symbol map of these modulation schemes. As shown in FIG. 2A, in QPSK modulation, encoded 2-bit data is mapped to one symbol. As shown in FIG. 2B, in 16-QAM, 4-bit data is mapped to one symbol. As shown in FIG. 2C, in 64-QAM, 6-bit data is mapped to one symbol.

  Referring to FIG. 2, when the transmittable symbol rate is fixed, the actually transmittable data amount is 64QAM, which has the largest number of bits mapped per symbol, and QPSK is the least. On the other hand, 64QAM is vulnerable to noise because the distance between adjacent symbols is short, and QPSK has the best error characteristics at the same level of noise.

Thus, the relationship between the data transfer amounts is
a (R = 1/2, QPSK) <b (R = 1/2, 16QAM) <c (R = 3/4,
16QAM) <d (R = 3/4, 64QAM)
On the other hand, the relationship between the noise endurance characteristics is
a>b>c> d
It becomes.

  The control unit 1105 selects a combination of coding and modulation with a large data transfer amount in the case of a good propagation path with little noise (when the reception quality is good). The control unit 1105 selects a combination of coding and modulation that suppresses the data transfer amount and reinforces the noise endurance characteristics in the case of a poor propagation path with a lot of noise (the reception quality is poor).

  The control data generator 1106 generates a control signal for transmitting the encoding / modulation scheme selected by the controller 1105 to the user terminal. Encoding / modulating section 1107 encodes / modulates the output of control data generating section 1106 in a predetermined manner. Usually, QPSK modulation is performed.

  Spreading section 1108 spreads the pilot signal, the communication target data output from adaptive coding / modulating section 1109, and the control signal output from coding / modulating section 1107 using different spreading codes.

  The adaptive coding / modulation unit 1109 performs coding / modulation processing on communication target data (for example, packet data) according to the coding method and modulation method selected by the control unit 1105. FIG. 3 shows a detailed configuration of adaptive coding / modulation section 1109. Adaptive coding / modulation section 1109 has switches 1601 and 1604, coding sections 1602a-d, and modulation sections 1603a-d. Switches 1601 and 1604 are installed on the input side and the output side, respectively, and select one of encoding sections 1602a-d and modulation section 1603a-d according to the encoding scheme and modulation scheme selected by control section 1105. . Encoding sections 1602a-d add an error correction code to the input signal and output. That is, it is encoded and output. Modulating sections 1603a-d perform modulation symbol mapping on the signals encoded by encoding sections 1602a-d, and output. That is, the signal is modulated and output.

  D / A conversion section 1110 converts the digital signal output from spreading section 1108 into an analog signal and outputs the analog signal to transmission / reception sharing apparatus 1101.

  Here, FIG. 4 shows the contents of signals transmitted / received by the base station to / from the user terminal via the transmission / reception sharing device 1101. First, the reception quality data signal 2 transmitted from the user terminal is received on the uplink control channel. Then, the control signal 4 is transmitted to the user terminal on the downlink control channel. The control signal is determined based on the reception quality data signal 2 as described above. Further, immediately after the transmission of the control signal, the communication target data 6 is transmitted to the user terminal on the downlink data channel.

  An embodiment of the present invention relates to a user terminal, and an embodiment of the present invention will be described below with reference to the drawings.

  FIG. 5 is a block diagram illustrating a configuration of a user terminal (receiving device) according to the embodiment of the present invention. The user terminal includes a transmission / reception sharing device 101, an A / D conversion unit 111, a despreading unit 102, a control data demodulation / decoding unit 103, a control unit 104, a data demodulation / decoding unit 105, a propagation path estimation unit 106, a reception quality estimation unit. 107, a reception quality bit insertion unit 108, a modulation unit 109, a spreading unit 110, a sample rate supply unit 112, and an interference suppression unit 113.

  The transmission / reception sharing device 101 receives a signal transmitted from a base station (see FIG. 1). This received signal is called a received signal. The received signal has data to be communicated, a pilot signal and a control signal, and is spread and modulated in the base station. The control signal specifies a modulation method, that is, a demodulation method. For example, if the control signal indicates that the received signal has been modulated by QPSK at the base station, the demodulation method must be QPSK. That is, QPSK is specified as the demodulation method. The control signal also specifies the decoding method. Further, transmission / reception sharing apparatus 101 transmits the reception quality data signal output from spreading section 110 to the base station.

  The A / D conversion unit 111 and the despreading unit 102 constitute a despreading unit that spreads the received signal and outputs communication target data, a pilot signal, and a control signal. Alternatively, only the despreading unit 102 can be regarded as despreading means. In this case, the transmission / reception sharing device 101 and the A / D converter 111 serve as a receiving unit. A / D conversion section 111 digitizes the received signal. Despreading section 102 despreads the digitized received signal and outputs communication target data, a pilot signal and a control signal.

Interference suppression section 113 suppresses multipath interference at the output of A / D conversion section 111. Higuchi et al., “Ultra High-Speed Packet Transmission Characteristics Using Multipath Interference Canceller in W-CDMA Downlink” (IEICE Technical Report RCS2000-134 Oct 2000) Such as interference cancellers, Hooli et al. “Multiple Access Interference suppression with Linear Chip Equalizers
in WCDMA Downlink Receivers ”, Proc. Global
Use the equalizer found in Telecommunications Conf. Pp.467-471. Nov. 1999. For example, a pilot signal output from despreading section 102 is input to interference suppression section 113, and propagation path characteristics are estimated from pilot components, and the propagation path characteristics are adaptively equalized.

  Since the processing by the interference suppression unit 113 is processing at the chip sample rate, extremely high-speed arithmetic processing is required, and large power is consumed. Therefore, it is not preferable to always suppress the multipath interference by the interference suppression unit 113. On the other hand, when the modulation scheme is 64-QAM or 16-QAM, it is more vulnerable to multipath interference than when the modulation scheme is QPSK. Therefore, the control unit 104 reads out the demodulation method and sends it to the interference suppression unit 113. Then, interference suppression section 113 suppresses multipath interference when the demodulation scheme is 64-QAM or 16-QAM, and does not suppress multipath interference when the demodulation scheme is QPSK.

  Control data demodulation / decoding section 103 demodulates and decodes the control signal by a predetermined method. For example, if it is predetermined that the control signal be QPSK-modulated, the control signal is demodulated by the QPSK method.

  Control section 104 reads the designated demodulation scheme and decoding scheme from the control signal output from control data demodulation / decoding section 103. Then, based on the designated demodulation method, it controls A / D conversion section 111, despreading section 102, data demodulation / decoding section 105, propagation path estimation section 106, sample rate supply section 112, and interference suppression section 113. The details of the control will be described together with the description of the data demodulation / decoding unit 105, the propagation path estimation unit 106, and the sample rate supply unit 112. The control of the interference suppression unit 113 is as described above.

  Data demodulation / decoding section 105 demodulates and decodes the communication target data output from despreading section 102. The demodulation method and the decoding method are specified in the control signal, and are transmitted from the control unit 104.

  Propagation path estimating section 106 calculates the amount of phase rotation based on the pilot signal output from despreading section 102. The phase rotation amount is a phase difference between a received signal and an expected received signal, as shown in FIG. The phase rotation amount is obtained after averaging the M pilot symbols in consideration of the influence of noise components added on the pilot channel. Here, the number of pilot symbols to be used, that is, the length of the pilot signal to be used is determined based on the demodulation method specified in the control signal. The demodulation method is sent from control section 104.

  Since the amount of noise added to the pilot symbol varies depending on the propagation path characteristics, it is effective to change the length of the pilot signal (the number of pilot symbols) according to the propagation path characteristics. That is, if the amount of noise is large, it is preferable to lengthen the length of the pilot signal used for obtaining the average to reduce the influence of noise. If the amount of noise is small, it is preferable to shorten the length of the pilot signal used for obtaining the average and obtain the instantaneous data (the amount of phase rotation) as much as possible.

  Here, if the amount of noise is large, the demodulation method specified in the control signal is QPSK. Therefore, if the demodulation scheme sent from control section 104 is QPSK, propagation path estimating section 106 lengthens the pilot signal used when calculating the average. On the other hand, if the amount of noise is small, the demodulation method specified in the control signal is 64QAM. Therefore, if the demodulation scheme sent from control section 104 is 64QAM, propagation path estimating section 106 shortens the length of the pilot signal used when calculating the average. FIG. 7 shows the length of the pilot signal used for obtaining the average determined in this way. The pilot signal has the shortest length (six pilot symbols) when the demodulation method is 64QAM, and the longest pilot signal (20 pilot symbols) when the demodulation method is QPSK. When the demodulation method is 16QAM, the length of the pilot signal is medium (10 pilot symbols).

  The control of the pilot signal length has been described assuming that control section 104 controls propagation path estimation section 106. However, it is also possible for the control unit 104 to control the length of the pilot signal to be despread by the despreading unit 102. The length of the pilot signal to be despread in 64QAM is the shortest, and the length of the pilot signal to be despread in the demodulation method is QPSK is the longest. When the demodulation method is 16QAM, the length of the pilot signal to be despread is set to a medium length.

  Reception quality estimation section 107 estimates the signal-to-noise ratio of the downlink data channel. The signal-to-noise ratio is estimated by calculating the signal-to-noise ratio of pilot channel symbols that are code-multiplexed with the downlink data channel and transmitted in parallel, and taking into account the pilot channel power and data channel power difference as follows: I do.

受信品質ビット挿入部108は、推定された受信品質推定値(Data_SNR)を、ユーザ端末が基地局に向けて送信するユーザ端末送信信号に挿入し、受信品質データ信号として出力する。変調部109は、受信品質データ信号を変調して出力する。拡散部110は、変調された受信品質データ信号を拡散して送受信共用装置101に出力する。

Reception quality bit insertion section 108 inserts the estimated reception quality estimation value (Data_SNR) into a user terminal transmission signal transmitted by the user terminal to the base station, and outputs it as a reception quality data signal. Modulating section 109 modulates and outputs the reception quality data signal. Spreading section 110 spreads the modulated reception quality data signal and outputs it to transmission / reception sharing apparatus 101.

  The sample rate supply unit 112 supplies the sample rates of the despreading unit 102 and the A / D conversion unit 111. Here, the sample rate is determined based on the demodulation method specified in the control signal. The demodulation method is sent from control section 104.

  The A / D converter 111 converts an analog baseband signal into a digital signal. The A / D conversion is performed by oversampling the spreading chip rate in order to perform fine synchronization processing in the baseband unit. When processing wideband baseband signals such as W-CDMA, high-speed A / D conversion is required, but selecting the minimum oversampling rate that can maintain the reception characteristics reduces power consumption. It is important to realize. In W-CDMA using QPSK modulation, 4 or 8 oversamples are generally considered valid. In 16QAM modulation, a higher sample rate is required. Further, in 64QAM modulation, a higher sample rate is required in 16QAM modulation.

  Therefore, if the demodulation scheme sent from control section 104 is QPSK modulation, sample rate supply section 112 supplies a sample rate four times the chip rate. If the demodulation method sent from the control unit 104 is 16QAM modulation, the sample rate supply unit 112 supplies a sample rate eight times the chip rate. If the demodulation method sent from the control unit 104 is 64QAM modulation, the sample rate supply unit 112 supplies a sample rate 16 times the chip rate.

  As described above, the sample rate supply unit 112 supplies a sample rate 16 times the chip rate only in the case of 64QAM modulation. Other modulation schemes provide lower sample rates.

  As shown in FIG. 8, the sample rate supply unit 112 can supply the sample rate by changing the cycle of the SYNC pulse for trigger timing of data. 8 (a) shows the state of 64QAM data transfer, FIG. 8 (b) shows the state of 16QAM transfer, and FIG. 8 (c) shows the state of QPSK transfer.

  Further, as shown in FIG. 9, it can be realized by changing the data transfer clock speed. 9 (a) shows the situation at the time of 64QAM data transfer, FIG. 9 (b) shows the situation at the time of 16QAM transfer, and FIG. 9 (c) shows the situation at the time of QPSK transfer.

  Next, the operation of the embodiment of the present invention will be described with reference to the flowchart of FIG.

  First, the transmission / reception sharing device 101 receives a control signal (S10). The received control signal is digitized by the A / D converter 111 and despread by the despreader 102. Then, it is demodulated and decoded by control data demodulation / decoding section 103. It is assumed that the control signal is determined to be QPSK-modulated in the base station. Therefore, the sample rate is set to a minimum value such as four times the chip rate. The demodulation method is the QPSK method. Further, the length of the pilot signal (the number of pilot symbols) or the length of the despread pilot signal (the number of pilot symbols) used for obtaining the average is set to 20 as the maximum length.

  The control unit 104 reads the designated demodulation method and decoding method from the control signal output from the control data demodulation / decoding unit 103 (S12). Here, the control unit 104 determines whether or not the communication target data has been received (S14). If the communication target data has not been received (S14, No), the process returns to the control signal reception (S10). If the communication target data has been received (S14, Yes), the length of the pilot signal (the number of pilot symbols) used for obtaining the sample rate and average of the A / D converter 111 and the like is determined.

  If the demodulation method specified in the control signal is QPSK (S16, Yes), the sample rate and the length of the pilot signal used for obtaining the average (referred to as pilot average length) are not changed. That is, the control unit 104 controls the sample rate supply unit 112 to set the sample rate to a minimum value such as four times the chip rate. Further, control section 104 controls propagation path estimation section 106 to set the average pilot length to the maximum length of 20 pilots. Control section 104 may control despreading section 102 so that the length of the pilot signal to be despread (the number of pilot symbols) is set to the maximum length of 20. Note that the control unit 104 controls the interference suppression unit 113 to stop the suppression of multipath interference.

  When the demodulation method is QPSK, the processing may be slow, so the sample rate may be low. However, since the added noise is expected to be large, it is necessary to suppress the noise by increasing the average pilot length. Therefore, the sample rate is set to the minimum value, and the average pilot length is set to the maximum value. In addition, when the demodulation method is QPSK, since it is relatively resistant to multipath interference, there is little hindrance to communication without suppressing multipath interference. Therefore, power consumption is reduced by not suppressing multipath interference.

  If the demodulation method specified in the control signal is 64QAM (S16, No and S20, No), the control unit 104 controls the sample rate supply unit 112 to set the sample rate to a maximum of 16 times the chip rate. Value (S32). The control unit 104 controls the propagation path estimation unit 106 to set the average pilot length to the minimum length of six (S34). Control section 104 may control despreading section 102 so that the length of the pilot signal to be despread (the number of pilot symbols) is set to the minimum length of six. Then, the control unit 104 controls the interference suppression unit 113 to suppress multipath interference (S36).

  When the demodulation method is 64QAM, the processing is fast, so the sample rate must be high. On the other hand, since it is predicted that the noise to be added is small, it is preferable to set the average pilot length small and give priority to measuring the instantaneous phase rotation amount over noise suppression. Therefore, the sample rate is set to the maximum value, and the average pilot length is set to the minimum value. Also, when the demodulation method is 64QAM, it is susceptible to multipath interference, so multipath interference is suppressed.

  Furthermore, if the demodulation method specified in the control signal is 16QAM (S16, No and S20, Yes), the control unit 104 controls the sample rate supply unit 112 to set the sample rate to a medium value such as eight times the chip rate. (S22). Further, the control unit 104 controls the propagation path estimation unit 106 to set the average pilot length to 10 which is a medium length (S24). Control section 104 may control despreading section 102 to set the length (number of pilot symbols) of pilot signals to be despread to 10 which is a medium length. Then, the control unit 104 controls the interference suppression unit 113 to suppress multipath interference (S26).

  When the demodulation method is 16QAM, the processing is medium speed, so a medium sample rate is required. On the other hand, since it is predicted that the noise to be added is moderate, it is preferable to set the average pilot length to be medium to satisfy both the noise suppression and the measurement of the instantaneous phase rotation amount. Therefore, the sample rate is set to a medium value, and the average pilot length is set to a medium value. Further, when the demodulation method is 16QAM, it is susceptible to multipath interference, so that multipath interference is suppressed.

  After setting the sample rate and the average pilot length as described above, the transmission / reception sharing device 101 receives the communication target data (S40). The communication target data is digitized by the A / D converter 111 and despread by the despreader 102. The despread communication target data is sent to data demodulation / decoding section 105, where it is demodulated and decoded. The demodulation and decoding method is specified in the control signal, and the control unit 104 sends the specified demodulation and decoding method to the data demodulation / decoding unit 105. At this time, the phase rotation amount estimated by the propagation path estimation unit 106 is also sent to the data demodulation / decoding unit 105 and used for phase correction.

  The pilot signal is sent together with the communication target data, and is sent to propagation path estimation section 106 and reception quality estimation section 107 via A / D conversion section 111 and despreading section 102. Based on the pilot signal, reception quality estimating section 107 estimates the reception quality. The estimated reception quality value is inserted into the user terminal transmission signal in reception quality bit insertion section 108, and reception quality data signal is output from reception quality bit insertion section 108. The reception quality data signal is modulated and spread by modulation section 109 and spreading section 110 and transmitted to base station by transmission / reception sharing apparatus 101.

  When the reception of the communication target data as described above is completed, the control unit 104 sets the sample rate to four times the chip rate (S42) and sets the average pilot length to 20 (S44). Then, the suppression of the multipath interference by the interference suppression unit 113 is stopped (S46). That is, the sample rate, the average pilot length, and the operation state of the interference suppression unit 113 are initialized. Then, the process returns to receiving the control signal (S10). Note that the process is terminated at an arbitrary point due to power-off.

  According to the embodiment of the present invention, based on a control signal designating a demodulation method (QPSK, 16QAM, 64QAM), control section 104 sets a sample rate of despreading means (A / D conversion section 111 and despreading section 102). Control. As a result, when the demodulation method is QPSK or 16QAM, the sample rate can be appropriately set lower than when the demodulation method is 64QAM. For example, the sample rate can be eight times the chip rate (16 QAM) and four times the chip rate (QPSK). Therefore, a function corresponding to the demodulation method (64 QAM) that is most sensitive to accuracy deterioration (sample rate = 16 times the chip rate) does not need to be constantly operated.

  Further, based on a control signal designating a demodulation method (QPSK, 16QAM, 64QAM), control section 104 controls the length of a pilot signal (average pilot length) used by propagation path estimation section 106. As a result, the length of the pilot signal used by propagation path estimation section 106 can be appropriately increased in accordance with the demodulation method. For example, the average pilot length can be set to 10 (16 QAM) and 20 (QPSK). Therefore, it is not necessary to always operate the function corresponding to the demodulation method (64QAM) that is most sensitive to accuracy deterioration (assuming that the pilot average length = 6).

  Further, based on a control signal designating a demodulation method (QPSK, 16QAM, 64QAM), control section 104 controls the length of a pilot signal to be despread. Thus, the length of the pilot signal despread according to the demodulation method can be appropriately increased. For example, the length of the despread pilot signal can be 10 (16 QAM) and 20 (QPSK). Therefore, a function (assuming that the length of the despread pilot signal = 6) corresponding to the demodulation method (64QAM) which is most sensitive to the accuracy deterioration does not have to be constantly operated.

  Further, based on a control signal designating a demodulation method (QPSK, 16QAM, 64QAM), control section 104 controls the operation state of interference suppression section 113. This makes it possible to control whether or not to perform multipath interference according to the demodulation method. For example, suppression of multipath interference can be performed (16QAM, 64QAM) or not (QPSK). Therefore, a function (for suppressing multipath interference) corresponding to a demodulation method (16QAM, 64QAM) which is most sensitive to accuracy deterioration does not need to be constantly operated.

  In the present embodiment, the sample rate, the average pilot length, and the operation state of interference suppression section 113 are determined based on the modulation scheme (demodulation scheme) read from the control signal. However, the sample rate or the like may be determined according to the type of the received signal, that is, whether only the control signal or the communication target data is present. Even in such a case, a similar effect can be obtained. The operation at this time will be described with reference to the flowchart of FIG.

  The reception of the control signal (S10) and the reading of the demodulation method (S12) are the same as in FIG. Here, the control unit 104 determines whether or not the communication target data has been received (S14). If the communication target data has not been received (S14, No), the sample rate and the length of the pilot signal used for obtaining the average (referred to as pilot average length) are not changed. If the communication target data has been received (S14, Yes), the control unit 104 controls the sample rate supply unit 112 to set the sample rate to a maximum value such as 16 times the chip rate (S32). The control unit 104 controls the propagation path estimation unit 106 to set the average pilot length to the minimum length of six (S34). Control section 104 may control despreading section 102 so that the length of the pilot signal to be despread (the number of pilot symbols) is set to the minimum length of six. Then, control section 104 controls interference suppression section 113 to suppress multipath interference.

  The process after receiving the communication target data (S40) is the same as in FIG.

  Further, the above embodiment can be realized as follows. A media reading device of a computer including a CPU, a hard disk, a flash memory, and a medium (a floppy disk, a CD-ROM, a memory stick, etc.) reading device reads a medium recording a program for realizing the above-described respective portions, and , Flash memory, etc. Even with such a method, the above function can be realized.

  According to the present invention, the control means controls the sample rate of the despreading means based on the control signal specifying the demodulation method. As a result, the sample rate can be appropriately reduced according to the demodulation method, and the function (high-speed sample rate) corresponding to the demodulation method most sensitive to the accuracy deterioration does not need to be constantly operated.

  Further, according to the present invention, the control unit controls the length of the pilot signal used by the propagation path estimation unit based on the control signal designating the demodulation method. Thereby, the length of the pilot signal used by the propagation path estimating means can be appropriately increased according to the demodulation method, and the function corresponding to the demodulation method most sensitive to the accuracy deterioration (the length of the pilot signal to be used is Need not always operate).

  Further, according to the present invention, the control means controls the length of the despread pilot signal based on the control signal designating the demodulation method. Accordingly, the length of the pilot signal to be despread according to the demodulation method can be appropriately increased, and the function corresponding to the demodulation method most sensitive to accuracy deterioration (reducing the length of the despread pilot signal). ) Need not always be operated.

  Further, according to the present invention, the control means controls the sample rate, the length of the pilot signal used by the propagation path estimation means, and the length of the pilot signal to be despread by the despreading means, based on the type of the received signal. You may do so. Even in this case, it is not necessary to always operate the function corresponding to the demodulation method most sensitive to the accuracy deterioration (to shorten the length of the despread pilot signal).

  Further, according to the present invention, the control means controls the interference suppression means based on the control signal. Thus, the operation of the interference suppression unit can be controlled according to the demodulation method, and the function corresponding to the demodulation method most sensitive to the accuracy deterioration does not need to be constantly operated. Even if the control means controls the interference suppression means on the basis of the type of the received signal, the function corresponding to the demodulation method which is most sensitive to the accuracy degradation may not always be operated.

FIG. 2 is a block diagram illustrating a configuration of a base station using an adaptive modulation communication scheme. It is a figure which shows the symbol map of each modulation system (QPSK, 16-QAM, 64-QAM), the symbol map of QPSK (FIG. 2A), the symbol map of 16-QAM (FIG. 2B), 64 2 shows a symbol map of QAM (FIG. 2C). FIG. 3 is a block diagram showing a detailed configuration of an adaptive coding / modulation section 1109. FIG. 3 is a diagram showing the contents of signals transmitted and received by a base station to and from a user terminal via a transmission / reception sharing device 1101. FIG. 1 is a block diagram illustrating a configuration of a user terminal (receiving device) according to an embodiment of the present invention. It is a figure showing the amount of phase rotation. FIG. 4 is a diagram illustrating a length of a pilot signal used when obtaining an average. It is a time chart at the time of changing the cycle of the SYNC pulse for data trigger timing, and shows 64QAM data transfer (FIG. 8 (a)), 16QAM transfer (FIG. 8 (b)), and QPSK transfer (FIG. 8 (c)). Indicates a state. It is a time chart at the time of changing a data transfer clock speed, and shows the state of 64QAM data transfer (FIG. 9 (a)), 16QAM transfer (FIG. 9 (b)), and QPSK transfer (FIG. 9 (c)). 5 is a flowchart illustrating an operation of the exemplary embodiment of the present invention. 9 is a flowchart illustrating an operation of a modification of the embodiment of the present invention. 5 is a graph comparing the influence of each modulation scheme (QPSK, 16QAM, 64QAM) and the reception timing shift. 5 is a graph comparing the influence of each modulation scheme (QPSK, 16QAM, 64QAM) and a synchronous detection error.

Explanation of reference numerals

101 Transmission / reception shared device
102 Despreader
103 Control data demodulator / decoder
104 control unit
105 Data demodulator / decoder
106 Propagation path estimator
107 Receive quality estimator
108 Receive quality bit insertion unit
109 Modulation section
110 diffuser
111 A / D converter
112 Sample rate supply
113 Interference suppression unit

Claims (32)

A propagation path estimation device that receives a spread reception signal,
Receiving means for receiving the received signal having a pilot signal and a control signal specifying a demodulation method,
Despreading means for despreading the received signal and outputting the pilot signal and the control signal,
Propagation path estimation means for determining the amount of phase rotation of the received signal based on the pilot signal,
Based on the control signal, control means for controlling the length of the pilot signal used by the propagation path estimation means,
A propagation path estimating device comprising: A despreading device for receiving a spread reception signal,
Receiving means for receiving the received signal having a pilot signal and a control signal specifying a demodulation method,
Despreading means for despreading the received signal and outputting the pilot signal and the control signal,
Control means for controlling the length of the pilot signal to be despread by the despreading means, based on the control signal,
A despreading device equipped with. A receiving device for receiving a spread reception signal,
Communication means, receiving means for receiving the received signal having a pilot signal and a control signal specifying a demodulation method,
Despreading means for despreading the received signal, outputting the communication target data, the pilot signal and the control signal,
Propagation path estimation means for determining the amount of phase rotation of the received signal based on the pilot signal,
Data demodulation means for demodulating the communication target data based on the phase rotation amount,
Control means for controlling the length of the pilot signal used by the propagation path estimation means and the demodulation method of the data demodulation means based on the control signal;
A receiving device comprising: A receiving device for receiving a spread reception signal,
Communication means, receiving means for receiving the received signal having a pilot signal and a control signal specifying a demodulation method,
Despreading means for despreading the received signal, outputting the communication target data, the pilot signal and the control signal,
Data demodulation means for demodulating the communication target data,
Control means for controlling the length of the pilot signal to be despread by the despreading means and the demodulation method of the data demodulation means based on the control signal,
A receiving device comprising: A propagation path estimation method for receiving a spread reception signal,
A receiving step of receiving the received signal having a pilot signal and a control signal designating a demodulation method,
A despreading step of despreading the received signal and outputting the pilot signal and the control signal,
A propagation path estimation step of determining a phase rotation amount of the reception signal based on the pilot signal,
Based on the control signal, a control step of controlling the length of the pilot signal used in the propagation path estimation step,
A propagation path estimation method comprising: A despreading method for receiving a spread received signal,
A receiving step of receiving the received signal having a pilot signal and a control signal designating a demodulation method,
A despreading step of despreading the received signal and outputting the pilot signal and the control signal,
A control step of controlling a length of the pilot signal to be despread in the despreading step based on the control signal;
Despreading method with. A receiving method for receiving a spread received signal,
A receiving step of receiving the reception signal having a communication target data, a pilot signal and a control signal designating a demodulation method,
A despreading step of despreading the received signal and outputting the communication target data, the pilot signal and the control signal,
A propagation path estimation step of determining a phase rotation amount of the reception signal based on the pilot signal,
A data demodulation step of demodulating the communication target data based on the phase rotation amount,
Based on the control signal, a control step of controlling the length of the pilot signal used in the propagation path estimation step and the demodulation method of the data demodulation step,
Receiving method with. A receiving method for receiving a spread received signal,
A receiving step of receiving the reception signal having a communication target data, a pilot signal and a control signal designating a demodulation method,
A despreading step of despreading the received signal and outputting the communication target data, the pilot signal and the control signal,
A data demodulation step of demodulating the communication target data,
Based on the control signal, a control step of controlling the length of the pilot signal to be despread in the despreading step and the demodulation method of the data demodulation step,
Receiving method with. Having a pilot signal and a control signal designating a demodulation method, receiving means for receiving a spread reception signal,
Despreading means for despreading the received signal and outputting the pilot signal and the control signal,
Propagation path estimation means for determining the amount of phase rotation of the received signal based on the pilot signal,
A program for causing a computer to execute control processing in a propagation path estimation device having
A program for causing a computer to execute a control process for controlling a length of the pilot signal used by the propagation path estimation unit based on the control signal. Having a pilot signal and a control signal designating a demodulation method, receiving means for receiving a spread reception signal,
Despreading means for despreading the received signal and outputting the pilot signal and the control signal,
A program for causing a computer to execute control processing in a despreading device having
A program for causing a computer to execute a control process for controlling a length of the pilot signal to be despread by the despreading means based on the control signal. Data to be communicated, having a control signal designating a pilot signal and a demodulation method, receiving means for receiving a spread reception signal,
Despreading means for despreading the received signal, outputting the communication target data, the pilot signal and the control signal,
Propagation path estimation means for determining the amount of phase rotation of the received signal based on the pilot signal,
Data demodulation means for demodulating the communication target data based on the phase rotation amount,
A program for causing a computer to execute control processing in a receiving device having
A program for causing a computer to execute a control process for controlling a length of the pilot signal used by the propagation path estimation unit and a demodulation method of the data demodulation unit based on the control signal. Data to be communicated, having a control signal designating a pilot signal and a demodulation method, receiving means for receiving a spread reception signal,
Despreading means for despreading the received signal, outputting the communication target data, the pilot signal and the control signal,
Data demodulation means for demodulating the communication target data,
A program for causing a computer to execute control processing in a receiving device having
A program for causing a computer to execute a control process for controlling a length of the pilot signal to be despread by the despreading unit and a demodulation method of the data demodulation unit based on the control signal. Having a pilot signal and a control signal designating a demodulation method, receiving means for receiving a spread reception signal,
Despreading means for despreading the received signal and outputting the pilot signal and the control signal,
Propagation path estimation means for determining the amount of phase rotation of the received signal based on the pilot signal,
A computer-readable recording medium recording a program for causing a computer to execute control processing in the propagation path estimation device having
A recording medium readable by a computer in which a program for causing a computer to execute a control process for controlling a length of the pilot signal used by the propagation path estimation unit based on the control signal is recorded. Having a pilot signal and a control signal designating a demodulation method, receiving means for receiving a spread reception signal,
Despreading means for despreading the received signal and outputting the pilot signal and the control signal,
A computer-readable recording medium recording a program for causing a computer to execute a control process in the despreading device having
A recording medium readable by a computer in which a program for causing a computer to execute a control process for controlling a length of the pilot signal to be despread by the despreading means based on the control signal is recorded. Data to be communicated, having a control signal designating a pilot signal and a demodulation method, receiving means for receiving a spread reception signal,
Despreading means for despreading the received signal, outputting the communication target data, the pilot signal and the control signal,
Propagation path estimation means for determining the amount of phase rotation of the received signal based on the pilot signal,
Data demodulation means for demodulating the communication target data based on the phase rotation amount,
A computer-readable recording medium recording a program for causing a computer to execute a control process in a receiving device having
A computer-readable recording program for causing a computer to execute a control process for controlling a length of the pilot signal used by the propagation path estimation unit and a demodulation method of the data demodulation unit based on the control signal. Medium. Data to be communicated, having a control signal designating a pilot signal and a demodulation method, receiving means for receiving a spread reception signal,
Despreading means for despreading the received signal, outputting the communication target data, the pilot signal and the control signal,
Data demodulation means for demodulating the communication target data,
A computer-readable recording medium recording a program for causing a computer to execute a control process in a receiving device having
A computer-readable recording program for causing a computer to execute a control process for controlling a length of the pilot signal to be despread by the despreading unit and a demodulation method of the data demodulation unit based on the control signal. Medium. A propagation path estimation device that receives a spread reception signal,
Receiving means for receiving the received signal having a pilot signal,
Despreading means for despreading the received signal and outputting the pilot signal,
Propagation path estimation means for determining the amount of phase rotation of the received signal based on the pilot signal,
Control means for controlling the length of the pilot signal used by the propagation path estimation means based on the type of the received signal;
A propagation path estimating device comprising: A despreading device for receiving a spread reception signal,
Receiving means for receiving the received signal having a pilot signal,
Despreading means for despreading the received signal and outputting the pilot signal,
Control means for controlling the length of the pilot signal to be despread by the despreading means, based on the type of the received signal,
A despreading device equipped with. A receiving device for receiving a spread reception signal,
Receiving means for receiving the reception signal having communication target data and a pilot signal,
Despreading means for despreading the received signal and outputting the communication target data and the pilot signal,
Propagation path estimation means for determining the amount of phase rotation of the received signal based on the pilot signal,
Data demodulation means for demodulating the communication target data based on the phase rotation amount,
Control means for controlling the length of the pilot signal used by the propagation path estimation means and the demodulation method of the data demodulation means, based on the type of the received signal;
A receiving device comprising: A receiving device for receiving a spread reception signal,
Receiving means for receiving the reception signal having communication target data and a pilot signal,
Despreading means for despreading the received signal and outputting the communication target data and the pilot signal,
Data demodulation means for demodulating the communication target data,
Control means for controlling the length of the pilot signal to be despread by the despreading means and the demodulation method of the data demodulation means, based on the type of the received signal;
A receiving device comprising: A propagation path estimation method for receiving a spread reception signal,
A receiving step of receiving the received signal having a pilot signal,
A despreading step of despreading the received signal and outputting the pilot signal,
A propagation path estimation step of determining a phase rotation amount of the reception signal based on the pilot signal,
Based on the type of the received signal, a control step of controlling the length of the pilot signal used in the propagation path estimation step,
A propagation path estimation method comprising: A despreading method for receiving a spread received signal,
A receiving step of receiving the received signal having a pilot signal,
A despreading step of despreading the received signal and outputting the pilot signal,
A control step of controlling a length of the pilot signal to be despread in the despreading step based on the type of the received signal;
Despreading method with. A receiving method for receiving a spread received signal,
A receiving step of receiving the reception signal having communication target data and a pilot signal,
A despreading step of despreading the received signal and outputting the communication target data and the pilot signal,
A propagation path estimation step of determining a phase rotation amount of the reception signal based on the pilot signal,
A data demodulation step of demodulating the communication target data based on the phase rotation amount,
Based on the type of the received signal, a control step of controlling the length of the pilot signal used in the propagation path estimation step and the demodulation method of the data demodulation step,
Receiving method with. A receiving method for receiving a spread received signal,
A receiving step of receiving the reception signal having communication target data and a pilot signal,
A despreading step of despreading the received signal and outputting the communication target data and the pilot signal,
A data demodulation step of demodulating the communication target data,
A control step of controlling a demodulation method in the data demodulation step and a length of the pilot signal to be despread in the despreading step, based on the type of the received signal;
Receiving method with. Having a pilot signal, receiving means for receiving the spread received signal,
Despreading means for despreading the received signal and outputting the pilot signal,
Propagation path estimation means for determining the amount of phase rotation of the received signal based on the pilot signal,
A program for causing a computer to execute control processing in a propagation path estimation device having
A program for causing a computer to execute a control process for controlling a length of the pilot signal used by the propagation path estimation unit based on a type of the received signal. Reception means having a pilot signal and receiving the spread reception signal,
Despreading means for despreading the received signal and outputting the pilot signal,
A program for causing a computer to execute control processing in a despreading device having
A program for causing a computer to execute a control process for controlling the length of the pilot signal to be despread by the despreading means based on the type of the received signal. Having communication target data and a pilot signal, receiving means for receiving a spread received signal,
Despreading means for despreading the received signal and outputting the communication target data and the pilot signal,
Propagation path estimation means for determining the amount of phase rotation of the received signal based on the pilot signal,
Data demodulation means for demodulating the communication target data based on the phase rotation amount,
A program for causing a computer to execute control processing in a receiving device having
A program for causing a computer to execute a control process for controlling a length of the pilot signal used by the propagation path estimation unit and a demodulation method of the data demodulation unit based on a type of the received signal. Having communication target data and a pilot signal, receiving means for receiving a spread received signal,
Despreading means for despreading the received signal and outputting the communication target data and the pilot signal,
Data demodulation means for demodulating the communication target data,
A program for causing a computer to execute control processing in a receiving device having
A program for causing a computer to execute a control process for controlling a length of the pilot signal despread by the despreading unit and a demodulation method of the data demodulation unit based on a type of the received signal. Having a pilot signal, receiving means for receiving the spread received signal,
Despreading means for despreading the received signal and outputting the pilot signal,
Propagation path estimation means for determining the amount of phase rotation of the received signal based on the pilot signal,
A computer-readable recording medium recording a program for causing a computer to execute control processing in the propagation path estimation device having
A recording medium readable by a computer in which a program for causing a computer to execute a control process for controlling a length of the pilot signal used by the propagation path estimation unit based on a type of the received signal is recorded. Reception means having a pilot signal and receiving the spread reception signal,
Despreading means for despreading the received signal and outputting the pilot signal,
A computer-readable recording medium recording a program for causing a computer to execute a control process in the despreading device having
A recording medium readable by a computer in which a program for causing a computer to execute a control process for controlling a length of the pilot signal to be despread by the despreading means based on a type of the received signal is recorded. Having communication target data and a pilot signal, receiving means for receiving a spread received signal,
Despreading means for despreading the received signal and outputting the communication target data and the pilot signal,
Propagation path estimation means for determining the amount of phase rotation of the received signal based on the pilot signal,
Data demodulation means for demodulating the communication target data based on the phase rotation amount,
A computer-readable recording medium recording a program for causing a computer to execute a control process in a receiving device having
Based on the type of the received signal, it can be read by a computer that stores a program for causing a computer to execute a control process for controlling a length of the pilot signal used by the propagation path estimation unit and a demodulation method of the data demodulation unit. Recording medium. Having communication target data and a pilot signal, receiving means for receiving a spread received signal,
Despreading means for despreading the received signal and outputting the communication target data and the pilot signal,
Data demodulation means for demodulating the communication target data,
A computer-readable recording medium recording a program for causing a computer to execute a control process in a receiving device having
Based on the type of the received signal, it can be read by a computer that has recorded thereon a program for causing a computer to execute control processing for controlling the length of the pilot signal to be despread by the despreading unit and the demodulation method of the data demodulation unit. Recording medium.

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