JP6932257B2 - Receiving machine - Google Patents

Description

The present invention relates to a receiver, and more particularly to a receiver that estimates a frequency deviation using a received signal.

Conventionally, a frequency deviation estimation method using maximum likelihood series estimation is known. The conventional frequency deviation estimation method is disclosed in, for example, Non-Patent Document 1.

Further, as a conventional receiver adopting the frequency deviation estimation method, for example, there is a receiver disclosed in Patent Document 1.

In a conventional receiver, a received signal is sampled, a known series of symbol rates is extracted from the received signal, and frequency correction is performed on the extracted known series. At this time, a plurality of different frequency correction values are assigned to the extracted known series.

Subsequently, transmission line estimation and sequence estimation are performed on each of the plurality of signals after frequency correction with the plurality of frequency correction values, and the likelihood of each of the plurality of signals is calculated as the plurality of likelihoods. Of the plurality of calculated likelihoods, the frequency correction value corresponding to the likelihood showing the lowest value is estimated as the frequency deviation.

Japanese Patent No. 4440141

Kazuhiro Okanoue et al., "Construction of MLSE Receiver with Frequency Offset Correction Function in TDMA Digital Mobile Communication", IEICE Transactions B, 1990, p. 736-744

A conventional receiver that employs a frequency deviation estimation method has a configuration in which when a known series is extracted from a received signal, it is extracted at a symbol rate.

For this reason, in a delayed wave generation environment in which a delayed wave is generated and multiple paths arrive, the known series is affected by the frequent appearance and disappearance of the arrival timing of the preceding wave or the delayed wave of the known series. It was difficult to get at Nyquist timing. In addition, "acquiring the known series at the Nyquist timing" means, to be precise, "sampling the known series at the accurate Nyquist frequency".

As a result, the conventional receiver has a problem that the transmission line estimation accuracy is deteriorated under the delayed wave generation environment, and as a result, the likelihood calculation accuracy and the frequency deviation estimation accuracy are lowered.

An object of the present invention is to solve the above problems and to obtain a receiver capable of estimating a frequency deviation with high accuracy even in a delayed wave generation environment.

The receiver according to the present invention has a sampling unit that receives an analog received signal and converts it into a digital received signal, and estimates the timing of the leading wave and the delayed wave based on the digital received signal, and is used for the leading wave and the delayed wave. A leading wave / delayed wave timing estimation unit that outputs the timing information of the above, a signal switching unit that extracts a preceding wave reception signal and a delayed wave reception signal from the digital reception signal based on the timing information, the preceding wave reception signal, and The delayed wave reception signal is subjected to frequency correction processing by the first to nth frequency correction values, and the first to nth leading wave frequency correction signals and the first to nth delay wave frequency correction signals are obtained. The first 1st to nth frequency correction units to be obtained and the first to nth leading wave frequency correction signals are obtained to obtain the likelihood values to obtain the first to nth leading wave likelihood values. -The nth leading wave likelihood value generation unit and the first to nth delayed wave frequency correction signals are obtained for the likelihood value to obtain the first to nth delayed wave likelihood values. The first to nth delay wave likelihood value generation units, the first to nth leading wave likelihood values, and the first to nth delay wave likelihood values are received, and the first to nth delay wave likelihood values are received. The first to nth likelihood processing units that execute the likelihood processing for determining the likelihood representative value are provided, and the i-th likelihood processing unit includes the i-th leading wave likelihood value and the i-th delay. The i-th likelihood representative value is determined based on the wave likelihood value, and the lowest likelihood representative value among the first to nth likelihood representative values is used as the determination likelihood value, and the first to first likelihood representative values are used. A frequency deviation estimation determination unit that estimates the frequency correction value corresponding to the determination likelihood value as the frequency deviation among the frequency correction values of n is further provided.

The receiver of the present invention according to claim 1 targets the preceding wave reception signal and the delayed wave reception signal as evaluation targets, and has a first to nth frequency correction unit and a first to nth likelihood value generation unit for the preceding wave. , The first to nth likelihood representative values are determined through the processing by the first to nth delay wave likelihood value generation units and the first to nth likelihood processing units.

In the present invention according to claim 1, the lowest likelihood representative value among the first to nth likelihood representative values is used as the determination likelihood value, and among the first to nth frequency correction values, the lowest likelihood representative value is used. The frequency correction value corresponding to the above-mentioned determination likelihood value is estimated as the frequency deviation.

As a result, the invention of the present application according to claim 1 can accurately estimate the frequency deviation even in a delayed wave generation environment in which a delayed wave is generated and a plurality of paths arrive.

Objectives, features, aspects, and advantages of the present invention will become more apparent with the following detailed description and accompanying drawings.

It is explanatory drawing which shows typically the communication form between two radios. It is explanatory drawing which shows typically the internal structure of the radio device in this invention. It is a block diagram which shows the detail of the internal structure of the receiver of Embodiment 1 of this invention. It is explanatory drawing which shows typically the structure of the leading wave / delayed wave likelihood processing part of Embodiment 1. FIG. It is explanatory drawing which shows typically the structure of the leading wave / delayed wave likelihood processing part of Embodiment 2.

<Embodiment 1>
FIG. 1 is an explanatory diagram schematically showing a communication mode between two radios. As shown in the figure, communication is performed between the radios 100A and 100B. FIG. 1 shows a state in which the radio 100A is performing the transmission process and the radio 100B is performing the reception process.

FIG. 2 is an explanatory diagram schematically showing the internal configuration of the radio in the present invention. The radio 100 shown in FIG. 2 corresponds to the radios 100A and 100B shown in FIG. 1, respectively.

As shown in the figure, the radio 100 has a transmitter 101 and a receiver 102 inside. One of the transmitter 101 and the receiver 102 and the antenna 105 are connected via the switch 106. When the transmitter 101 is connected to the antenna 105, the transmitter 101 can perform transmission processing using the antenna 105, and when the receiver 102 is connected to the antenna 105, the receiver 102 can perform reception processing using the antenna 105. You can.

The receiver 102 includes an analog processing circuit 103 that processes an analog signal and a digital processing circuit 104 that processes a digital signal.

When the digital processing circuit 104 is realized by dedicated hardware, for example, a single circuit or a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate). Array) or a circuit that combines these can be considered.

Further, the processor is realized by, for example, a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, a DSP (Digital Signal Processor), or the like.

Further, all or a part of the digital processing circuit 104 may be executed by program processing using a software-based processor.

In the radio 100A shown in FIG. 1, by connecting the internal transmitter 101 and the antenna 105 via the switch 106, the internal transmitter 101 can perform a transmission process using the antenna 105.

On the other hand, in the radio 100B shown in FIG. 1, by connecting the internal receiver 102 and the antenna 105 via the switch 106, the internal receiver 102 can perform reception processing using the antenna 105. ..

The signal transmitted from the radio 100A and received by the radio 100B is usually received by the preceding wave W5 directly received by the radio 100B and an obstacle existing between the radio 100A and the radio 100B. It includes delayed waves W6A and W6B that are reflected and input. That is, there are two types of signals (preceding wave and delay wave) in the transmission / reception signals between the radios 100A and 100B.

In FIG. 1, the case where the transmission is transmitted from the radio 100A and the radio 100B receives the signal has been described, but the same applies to the case where the radio 100B transmits the signal and the radio 100A receives the signal.

FIG. 3 is a block diagram showing details of the internal configuration of the receiver 102 according to the first embodiment of the present invention. As shown in FIG. 3, the receiver 102 includes a sampling unit 1, a signal switching unit 2, a preceding wave / delayed wave timing estimation unit 3, a frequency correction unit 41 to 4n (n ≧ 2), and a frequency deviation likelihood value generation. It has units 51 to 5n and 61 to 6n, a preceding wave / delayed wave likelihood processing unit 71 to 7n, and a frequency deviation estimation determination unit 8 inside.

Of the components of the receiver 102 shown in FIG. 3, a sampling unit 1 is provided in the analog processing circuit 103, a signal switching unit 2 and a preceding wave / delayed wave timing estimation unit are provided in the digital processing circuit 104. 3. Frequency correction unit 41-4n, frequency deviation likelihood value generation unit 51-5n, frequency deviation likelihood value generation unit 61-6n, leading wave / delayed wave likelihood processing unit 71-7n, and frequency deviation estimation determination unit 8 Is provided.

Next, the operation of each component included in the receiver 102 according to the first embodiment of the present invention will be described.

The sampling unit 1 performs an A / D conversion process of converting the analog reception signal S0 input to the receiver 102 via the antenna 105 into a digital reception signal S1 by sampling the analog reception signal S0. The digital reception signal S1 is applied to the signal switching unit 2 and the preceding wave / delayed wave timing estimation unit 3.

The leading wave / delayed wave timing estimation unit 3 performs timing estimation based on the digital reception signal S1, calculates timing information for instructing the leading wave timing and the delayed wave timing, and outputs this timing information to the signal switching unit 2. For example, the leading wave / delayed wave timing estimation unit 3 calculates timing information by estimating the leading wave timing and the delayed wave timing based on synchronous words such as a known sequence and a sync word included in the digital reception signal S1. can do.

The signal switching unit 2 extracts the preceding wave reception signal S5 by acquiring a known sequence of the preceding wave signal from the digital reception signal S1 at Nyquist timing based on the timing information from the preceding wave / delayed wave timing estimation unit 3. The delayed wave reception signal S6 is extracted by acquiring a known sequence of the delay wave signal from the digital reception signal S1 at the Nyquist timing.

The delayed wave timing indicated by the timing information is set so that the known sequence in the digital reception signal S1 is acquired at the Nyquist timing at a timing later than the preceding wave timing with reference to the preceding wave timing. Further, as the extracted delayed wave receiving signal S6, for example, a delayed wave receiving signal having the latest arrival timing or a delayed wave receiving signal having the highest power among a plurality of delayed wave receiving signals can be considered.

The preceding wave reception signal S5 and the delayed wave reception signal S6 extracted by the signal switching unit 2 are applied to the frequency correction units 41 to 4n, respectively.

The frequency correction units 41 to 4n perform frequency correction processing using the first to nth frequency correction values on the preceding wave reception signal S5 and the delayed wave reception signal S6, and perform the frequency correction processing for the first to nth leading waves. And the first to nth delay wave frequency correction signals are output. The contents of the first to nth frequency correction values are different from each other.

Each frequency correction unit 4i (any of i = 1 to n) performs frequency correction processing for adding the i-th frequency correction value to each of the preceding wave reception signal S5 and the delay wave reception signal S6 signal, and the i-th The frequency correction signal for the leading wave and the frequency correction signal for the i-th delayed wave are output. That is, the frequency correction processing for the preceding wave reception signal S5 and the delayed wave reception signal S6 signal by the frequency correction unit 4i is performed using the same third frequency correction value. In the present specification, "n" means an integer of 2 or more, and "i" means an arbitrary integer satisfying 1 or more and n or less.

The first to nth leading wave frequency correction signals output from the frequency correction units 41 to 4n are applied to the frequency deviation likelihood value generation units 51 to 5n. The frequency deviation likelihood value generation units 51 to 5n function as the first to nth leading wave likelihood value generation units.

The first to nth delayed wave frequency correction signals output from the frequency correction units 41 to 4n are applied to the frequency deviation likelihood value generation units 61 to 6n. The frequency deviation likelihood value generation units 61 to 6n function as the first to nth delay wave likelihood value generation units.

The frequency deviation likelihood value generation unit 5i, which is the i-th (any of i = 1 to n) leading wave likelihood value generation unit, has a sequence estimation unit 15 and a transmission line estimation unit 25 inside. The transmission line estimation unit 25 estimates the transmission line of the i-th preceding wave frequency correction signal and obtains the transmission line estimation information. This transmission line estimation information becomes the transmission line estimation information for the preceding wave.

The sequence estimation unit 15 performs sequence estimation of the i-th leading wave frequency correction signal based on the transmission line estimation information received from the transmission line estimation unit 25 and the i-th leading wave frequency correction signal. By executing the sequence estimation by the sequence estimation unit 15, the likelihood of the i-th leading wave frequency correction signal is calculated as the leading wave likelihood value D5i. This leading wave likelihood value D5i becomes the i-th leading wave likelihood value.

The frequency deviation likelihood value generation unit 6i, which is the i-th (any of i = 1 to n) delay wave likelihood value generation unit, has a series estimation unit 16 and a transmission line estimation unit 26 inside. The transmission line estimation unit 26 estimates the transmission line of the i-th delayed wave frequency correction signal and obtains the transmission line estimation information. This transmission line estimation information becomes transmission line estimation information for delayed waves.

The sequence estimation unit 16 performs sequence estimation of the i-th delay wave frequency correction signal based on the transmission line estimation information received from the transmission line estimation unit 26 and the i-th delay wave frequency correction signal. By executing the sequence estimation by the sequence estimation unit 16, the likelihood of the i-th delayed wave frequency correction signal is calculated as the i-th delayed wave likelihood value D6i. This delayed wave likelihood value D6i becomes the i-th delayed wave likelihood value.

From the leading wave likelihood values D51 to D5n, which are the first to nth leading wave likelihood values output from the frequency deviation likelihood value generating units 51 to 5n, and from the frequency deviation likelihood value generating units 61 to 6n. Delayed wave likelihood values D61 to D6n, which are output first to nth delayed wave likelihood values, are given to the preceding wave / delayed wave likelihood processing units 71 to 7n.

FIG. 4 is an explanatory diagram schematically showing the configuration of the preceding wave / delayed wave likelihood processing unit 7i according to the first embodiment. As shown in the figure, the leading wave / delayed wave likelihood processing unit 7i (any of i = 1 to n) has the leading wave likelihood value D5i, which is the i-th leading wave likelihood value, and the i-th. A delayed wave likelihood value D6i, which is a delayed wave likelihood value, is given.

As shown in FIG. 4, the leading wave / delayed wave likelihood processing unit 7i has a likelihood selection unit 13 inside. The likelihood selection unit 13 receives the leading wave likelihood value D5i and the delayed wave likelihood value D6i, and selects the lower likelihood value of the leading wave likelihood value D5i and the delayed wave likelihood value D6i as the likelihood selection value D13. Select as. This likelihood selection value D13 becomes the likelihood representative value D7i. The likelihood representative value D7i selected by the likelihood selection unit 13 is output to the frequency deviation estimation determination unit 8 in the next stage.

The frequency deviation estimation determination unit 8 receives the likelihood representative values D71 to D7n output from the preceding wave / delayed wave likelihood processing units 71 to 7n, and determines the lowest likelihood value among the likelihood representative values D71 to D7n. Select as the judgment likelihood value.

Then, the frequency deviation estimation determination unit 8 determines the frequency correction value corresponding to the determination likelihood value among the first to nth frequency correction values as the frequency deviation.

For example, when the judgment likelihood value is the leading wave likelihood value D5k (k = 1 to one of n), the kth leading wave frequency correction signal and the kth delayed wave frequency correction signal. The kth frequency correction value adopted by the frequency correction unit 4k that outputs the above is determined as the frequency deviation. In addition, in this specification, "k" means one integer among integers of 1 or more and n or less.

The frequency deviation estimation determination unit 8 needs to recognize the first to nth frequency correction values adopted by the frequency correction units 41 to 4n. Therefore, the frequency deviation estimation determination unit 8 acquires the information of the first to nth frequency correction values from the frequency correction units 41 to 4n, and the information of the first to nth frequency correction values is stored in an internal memory (not shown). It is necessary to perform processing such as storing.

Then, the frequency deviation estimation determination unit 8 outputs the frequency deviation estimation information S8 instructing the determined frequency deviation.

As described above, in the receiver 102 of the first embodiment, the frequency correction unit 41 to 4n, the frequency deviation likelihood value generation unit 51 to 5n, and the frequency deviation likelihood value generation unit 51 to 5n, with the preceding wave reception signal S5 and the delay wave reception signal S6 as evaluation targets, After processing by the frequency deviation likelihood value generation units 61 to 6n and the preceding wave / delay wave likelihood processing units 71 to 7n, the likelihood representative values D71 to D7n, which are the first to nth likelihood representative values, are determined. doing.

Then, the frequency deviation estimation determination unit 8 of the receiver 102 of the first embodiment uses the lowest likelihood representative value among the likelihood representative values D71 to D7n as the determination likelihood value, and the frequency correction units 41 to 4n are used. Of the first to nth frequency correction values, the frequency correction value corresponding to the above-mentioned determination likelihood value is estimated as the frequency deviation.

As a result, the receiver 102 of the first embodiment can accurately estimate the frequency deviation even in a delayed wave generation environment in which a delayed wave is generated and a plurality of paths arrive.

Further, in the receiver 102 of the first embodiment, the frequency deviation likelihood value generation units 51 to 5n have the sequence estimation unit 15 and the transmission line estimation unit 25, respectively, so that the accuracy of the preceding wave likelihood values D51 to D5n is high. The frequency deviation likelihood value generation units 61 to 6n have the sequence estimation unit 16 and the transmission line estimation unit 26, respectively, so that the accuracy of the delay wave likelihood values D61 to D6n can be improved. ..

In addition, the leading wave / delayed wave likelihood processing unit 7i of the first embodiment determines the smaller likelihood value of the leading wave likelihood value D5i and the delayed wave likelihood value D6i as the likelihood representative value D7i. Therefore, the accuracy of the likelihood representative value D7i can be improved.

As described above, the receiver 102 of the first embodiment precedes based on the preceding wave likelihood values D51 to D5n in the preceding wave receiving signal S5 and the delayed wave likelihood values D61 to D6n in the delayed wave receiving signal S6. The likelihood representative values D71 to D7n are obtained by the wave / delayed wave likelihood processing units 71 to 7n.

That is, the receiver 102 of the first embodiment estimates the frequency deviation of the preceding wave receiving signal S5 and the delayed wave receiving signal S6 extracted by using the known sequence so that both the preceding wave and the delayed wave have the Nyquist timing. It is used as a sample signal to be used.

Therefore, the receiver 102 of the first embodiment can prevent the frequency deviation estimation accuracy from deteriorating due to the deterioration of the timing estimation accuracy even when the arrival timing of the known series changes instantaneously, and the conventional frequency deviation can be prevented. It has the effect of increasing the estimation accuracy of the frequency deviation compared to the estimation method.

<Embodiment 2>
FIG. 5 is an explanatory diagram schematically showing the configuration of the preceding wave / delayed wave likelihood processing unit 7i in the receiver 102 according to the second embodiment. As shown in the figure, the leading wave likelihood value D5i having the i-th leading wave likelihood value in the leading wave / delayed wave likelihood processing unit 7i (any of i = 1 to n) and the third delay. A delayed wave likelihood value D6i, which is a wave likelihood value, is given. It is the same as the receiver 102 of the first embodiment shown in FIGS. 1 to 3 except for the internal configuration of the leading wave / delayed wave likelihood processing unit 7i. Hereinafter, the features of the second embodiment will be mainly described with reference to FIG.

As shown in FIG. 5, the leading wave / delayed wave likelihood processing unit 7i of the second embodiment has a likelihood adding unit 14 inside. The likelihood addition unit 14 receives the leading wave likelihood value D5i and the delayed wave likelihood value D6i, and adds the leading wave likelihood value D5i and the delayed wave likelihood value D6 to obtain the likelihood addition value D14. Select as the representative value D7i. The likelihood representative value D7i, which is the likelihood addition value D14 of the likelihood addition unit 14, is output to the frequency deviation estimation determination unit 8 in the next stage.

The frequency deviation estimation determination unit 8 selects the lowest likelihood value among the likelihood representative values D71 to D7n output from the preceding wave / delayed wave likelihood processing units 71 to 7n as the determination likelihood value.

Then, the frequency deviation estimation determination unit 8 determines the frequency correction value corresponding to the determination likelihood value among the first to nth frequency correction values as the frequency deviation.

Then, the frequency deviation estimation determination unit 8 outputs the frequency deviation estimation information S8 instructing the determined frequency deviation.

As described above, the receiver 102 of the second embodiment has the first to nth likelihood representative values of the preceding wave receiving signal S5 and the delayed wave receiving signal S6 as evaluation targets, as in the first embodiment. A certain likelihood representative value D71 to D7n is determined.

Therefore, the frequency deviation estimation determination unit 8 of the receiver 102 of the second embodiment can accurately estimate the frequency deviation even in the delayed wave generation environment as in the first embodiment.

Further, in the receiver 102 of the second embodiment, the frequency deviation likelihood value generation units 51 to 5n have the sequence estimation unit 15 and the transmission path estimation unit 25, respectively, so that the accuracy of the preceding wave likelihood values D51 to D5n is high. The frequency deviation likelihood value generation units 61 to 6n have the sequence estimation unit 16 and the transmission line estimation unit 26, respectively, so that the accuracy of the delay wave likelihood values D61 to D6n can be improved. ..

In addition, the leading wave / delayed wave likelihood processing unit 7i of the second embodiment determines the addition value of the leading wave likelihood value D5i and the delayed wave likelihood value D6i as the likelihood representative value D7i. The likelihood values of the preceding wave reception signal S5 and the delay wave reception signal S6 can be reflected in all of the degree representative values D71 to D7n.

As described above, the preceding wave / delayed wave likelihood processing unit 7i of the second embodiment is configured to include the likelihood addition unit 14 instead of the likelihood selection unit 13, so that it is either a leading wave or a delayed wave. The frequency deviation can always be estimated using the likelihood values of both the leading wave and the delayed wave instead of one of the likelihood values. As a result, the effect of increasing the frequency deviation estimation accuracy as compared with the conventional frequency deviation estimation method can be obtained.

Although the present invention has been described in detail, the above description is exemplary in all aspects and the invention is not limited thereto. It is understood that innumerable variations not illustrated can be assumed without departing from the scope of the present invention.

Therefore, in the present invention, each embodiment can be freely combined, and each embodiment can be appropriately modified or omitted within the scope of the invention.

1 Sampling unit, 2 Signal switching unit, 3 Preceding wave / delayed wave timing estimation unit, 41 to 4n frequency correction unit, 51 to 5n, 61 to 6n frequency deviation likelihood value generation unit, 71 to 7n leading wave / delayed wave Probability processing unit, 8 frequency deviation estimation determination unit, 100, 100A, 100B radio, 101 transmitter, 102 receiver.

Claims (4)

A sampling unit (1) that receives an analog reception signal and converts it into a digital reception signal,
Based on the digital reception signal, the timing of the leading wave and the delayed wave is estimated, and the timing information for the leading wave and the delayed wave is output. The leading wave / delayed wave timing estimation unit (3) and the digital based on the timing information. A signal switching unit (2) that extracts the preceding wave reception signal and the delayed wave reception signal from the reception signal, and
The preceding wave reception signal and the delayed wave reception signal are subjected to frequency correction processing by the first to nth (n ≧ 2) frequency correction values, and the first to nth leading wave frequency correction signals and the first The first to nth frequency correction units (41 to 4n) for obtaining the nth delay wave frequency correction signal, and
The first to nth leading wave likelihood value generators that obtain the likelihood values for the first to nth preceding wave frequency correction signals and obtain the first to nth leading wave likelihood values. (51-5n) and
The first to nth delay wave likelihood value generators that obtain the likelihood values for the first to nth delay wave frequency correction signals and obtain the first to nth delay wave likelihood values. (61-6n) and
The first 1st to receive the 1st to 1st nth leading wave likelihood values and the 1st to 1st nth delayed wave likelihood values, and execute the likelihood processing to determine the 1st to nth likelihood representative values. The nth likelihood processing unit (71 to 7n) is provided, and the i-th (any of i = 1 to n) likelihood processing unit includes the i-th leading wave likelihood value and the i-th delayed wave. Determine the i-th likelihood representative value based on the utility likelihood value,
The lowest likelihood representative value among the first to nth likelihood representative values is set as the determination likelihood value, and among the first to nth frequency correction values, the frequency corresponding to the determination likelihood value. A frequency deviation estimation determination unit (8) that estimates the correction value as a frequency deviation is further provided.
Receiving machine. The receiver according to claim 1.
The i-th (any of i = 1 to n) likelihood value generator for the leading wave is
The transmission line estimation unit (25) that estimates the transmission line for the i-th preceding wave frequency correction signal and obtains the transmission line estimation information for the preceding wave, and the transmission line estimation unit (25).
A sequence estimation unit (15) that performs sequence estimation on the i-th preceding wave frequency correction signal based on the preceding wave transmission line estimation information to obtain the i-th leading wave likelihood value is included. ,
The i-th (any of i = 1 to n) delay wave likelihood value generator is
The transmission line estimation unit (26) that estimates the transmission line for the i-th delayed wave frequency correction signal and obtains the delay wave transmission line estimation information, and the transmission line estimation unit (26).
The sequence estimation unit (16) includes a sequence estimation unit (16) that performs sequence estimation on the i-th delay wave frequency correction signal based on the delay wave transmission line estimation information to obtain the i-th delay wave likelihood value. ,
Receiving machine. The receiver according to claim 1 or 2.
The i-th likelihood processing unit determines which of the i-th leading wave likelihood value and the i-th delayed wave likelihood value, whichever is smaller, is the i-th likelihood representative value. ,
Receiving machine. The receiver according to claim 1 or 2.
The i-th likelihood processing unit determines the addition value of the i-th leading wave likelihood value and the i-th delayed wave likelihood value as the i-th likelihood representative value.
Receiving machine.

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