JP2000224249A - Receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the precision of synchronization detection processing without increasing the number of known symbols that is added to a transmission signal at a transmission station and used for synchronization detection processing at a reception station. SOLUTION: An antenna 101 and a reception section 102 receive a slot addressed to its own station and a slot addressed to other stations from an outgoing line signal to conduct reception processing, a multiplier 106 multiplies a pilot symbol with a signal for a pilot symbol period of each slot, respectively, an averaging device 111 calculates the mean value of a phase rotation amount estimated and calculated for each slot, a conjugate complex number generator 112 calculates the conjugate complex number of the mean rotation amount and a multiplier 114 multiplies this conjugate complex number by a signal for a data symbol period in the received signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a receiving device,
In particular, TDMA (Time Division Multi)
In a digital mobile communication of the "iple access (time division multiple access)" system, a receiving apparatus for detecting a phase rotation amount of a received signal using a known symbol added to a data symbol and performing phase compensation, and a phase rotation amount detecting method therefor About.

[0002]

2. Description of the Related Art Generally, a synchronous detection process performed by a receiving apparatus on a radio signal subjected to phase modulation such as QPSK uses a known signal added before a data symbol containing a message. Is performed by detecting the amount of phase rotation of the received signal and compensating for the phase rotation of the received signal using the amount of phase rotation.

Hereinafter, a conventional receiving apparatus will be described with reference to FIGS. 6 and 7. FIG. FIG. 6 is a main block diagram showing a schematic configuration of a conventional receiving apparatus, and FIG. 7 is a schematic diagram showing a state of slot reception of the conventional receiving apparatus.

In FIG. 6, an antenna 601 receives a radio signal, a receiving section 602 performs a receiving process on the received signal, and a timing control section 603 responds to a symbol synchronization timing acquired by the receiving section 602. The synchronous detection circuit 604 performs synchronous detection processing on the received signal to obtain received data.

[0005] Regarding the acquisition of symbol synchronization timing in the receiving section 602, various methods have already been proposed, and a detailed description thereof will be omitted here.

The synchronous detection circuit 604 comprises a known symbol extraction unit 605, multipliers 606 and 609, a conjugate complex number generator 607, and a switch 608. The known symbol extracting section 605 extracts a signal of a known symbol (here, a pilot symbol) section from the received signal based on the symbol synchronization timing instructed by the timing control section 603, outputs the signal to the multiplier 606, and outputs the data. The signal in the symbol section is output to multiplier 609. Here, the signal In in the pilot symbol section in the received signal
(NT) is In (nT) = P (nT) · A (nT) · exp (jΘ
(NT)). Here, P (nT) is a pilot symbol, A (nT) is amplitude fluctuation due to fading or the like, and exp (jΘ (nT)) is a phase rotation amount due to fading or the like.

[0007] Multiplier 606 multiplies signal In (nT) in a pilot symbol section extracted from the received signal by a pilot symbol held in advance. Here, when the output of the multiplier 606 is represented as F (nT), F (nT) = In (nT) · P (nT) = P (nT) ² · A (nT) · exp (jΘ (nT)) Here, in a modulation scheme such as a QPSK modulation scheme in which the amplitude is constant and only the phase has information, P (nT) ² = 1, and therefore, the equation is expressed as F ( nT) = A (nT) .exp (jΘ (nT)). As described above, since the output of the multiplier 606 is expressed only by A (nT) and exp (jΘ (nT)), a signal representing a change due to fading of the received signal is obtained.

[0008] The conjugate complex number generator 607 inverts the polarity of the Q component of the input signal F (nT) to obtain a conjugate complex number F (nT).
Generate (nT) ^* . Here, the conjugate complex number F (nT) ^*
Can be expressed as F (nT) ^* = A (nT) .exp (-jΘ (nT)).

The switch 608 is connected to the timing controller 60
3 based on the symbol synchronization timing indicated by
While the signal of the data symbol section of the received signal is input to the multiplier 609, the output of the conjugate complex number generator 607 is output to the multiplier 609. Multiplier 609 combines signal D _in (nT) _in the data symbol section of the received signal with conjugate complex number F (n
T) Multiply ^* . Here, the signal D _in (nT) _in the data symbol section of the received signal is represented by
When expressed as (nT), D _in (nT) = D (nT) · A (nT) · exp (jΘ
(NT)), the output D _{out of the} multiplier 609
(NT) is: D _out (nT) = D _in (nT) · F (nT) ^* = D (nT) · A (nT) · exp (jΘ (nT)) · A (nT) · exp (−jΘ) (NT)) = D (nT) .A (nT) ^2- .

Here, since A (nT) ² has a constant phase and represents a fluctuation only in amplitude, the synchronous detection signal D _out (n
The phase information of T) is represented only by D (nT). Therefore, in the equation, it can be said that the phase of the received signal could be demodulated. Since the phase modulation method such as QPSK is a modulation method in which the amplitude is constant and only the phase has information, the synchronous detection processing is completed by demodulating the phase information in this manner.

[0011] Further, the conventional receiving apparatus performs the above-mentioned synchronous detection processing in the TDMA wireless communication using the pilot symbol of the slot allocated to the own station, and uses the obtained phase rotation amount to the own station. Compensate the phase of the data symbol in the assigned slot.

The configuration of a slot for a radio signal will be described below with reference to FIG. In FIG. 7, signals for each user (mobile station) are time-division multiplexed in slot units, and each slot includes, for example, a data symbol 706 and
A pilot symbol 705, which is a known symbol added immediately before the data symbol 706, and an AGC symbol 70 added immediately before the pilot symbol 705.
And 4.

Here, considering the user n, the mobile station of the user n receives the slot 703 assigned to itself from the radio signal, and in the synchronous detection circuit, receives the received signal (corresponding to the slot 703). ) And the slot 7 previously held
The multiplication process is performed on the 03 pilot symbol 705 and the same pilot symbol to obtain a phase rotation amount.

As described above, the conventional receiving apparatus receives a signal allocated to the own station from the time-division multiplexed radio signal, and multiplies the signal of the known symbol section in the received signal by a known symbol which is held in advance. Detect the amount of phase rotation
Performs synchronous detection processing.

[0015]

However, the conventional receiving apparatus has a problem that the number of pilot symbols added to the transmission signal must be increased in order to improve the accuracy of the synchronous detection processing.

That is, when the number of pilot symbols is increased, the influence of the radio signal on the transmission path from the transmitting station to the receiving station can be more accurately grasped. Although the pilot symbol is improved, the pilot symbol is a symbol used only for the synchronous detection process and does not include user data, so that the transmission efficiency is reduced.

Conversely, if the number of pilot symbols added to the transmission signal is reduced to improve the transmission efficiency, there is a problem that the accuracy of the synchronous detection processing is reduced.

As described above, in the method of transmitting a data symbol with a pilot symbol added thereto, the transmission efficiency and the synchronous detection processing accuracy have a so-called trade-off relationship in which increasing one increases the other.

The present invention has been made in view of such a point, and it is possible to improve the accuracy of synchronous detection processing without increasing the number of known symbols added to a transmission signal at a transmitting station and used for synchronous detection processing at a receiving station. It is an object of the present invention to provide a receiving device for improving.

[0020]

The gist of the present invention is that a mobile station performs synchronous detection processing using not only pilot symbols of slots allocated to its own station but also pilot symbols of slots allocated to other stations. That is.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A receiving apparatus according to a first aspect of the present invention is a radio communication apparatus comprising a radio signal which is sequentially transmitted to a plurality of communication partner stations at a predetermined period and comprises a plurality of symbol groups each including at least a known symbol. Receiving means for receiving at least two symbol groups from the plurality of symbols, detecting an amount of phase rotation for each of the received at least two symbol groups using the known symbols, and calculating an average value of these phase rotation amounts. A configuration including an amount detection unit and a phase compensation unit that performs phase compensation of a received signal using the calculated average phase rotation amount is adopted.

According to this configuration, a plurality of slots are received, a phase rotation amount is estimated and calculated for each slot, an average value thereof is obtained, and phase rotation compensation of the received signal is performed using the average value. In addition, the accuracy of the synchronous detection processing can be improved without increasing the number of known symbols added to the transmission signal.

In a receiving apparatus according to a second aspect of the present invention, in the first aspect, the average phase rotation amount detecting means holds in advance the same symbol as the known symbol, and sets each symbol of the received symbol group. The known symbol is multiplied by each of the held symbols to detect the amount of phase rotation for each received symbol group.

According to this configuration, in order to multiply the received signal of the known symbol section of the received signal of each slot by the previously held known symbol, the phase rotation amount is estimated and calculated for each slot. Can be.

[0025] In the receiving apparatus according to a third aspect of the present invention, in the first aspect or the second aspect, the known symbol is a different symbol for each of the symbol groups, and the average phase rotation amount detecting means includes: A configuration is adopted in which the same symbols as the known symbols included in each received symbol group are held in advance and multiplied by the corresponding known symbols of the received symbol group.

According to this configuration, even if the known symbols used for each slot in the transmission signal are different, all of the different known symbols are held in advance by the receiving station, so that the amount of phase rotation can be estimated for each slot. -Can be calculated.

[0027] In the receiving apparatus according to a fourth aspect of the present invention, in any one of the first to third aspects, at least one of the at least two received symbol groups is a signal directed to its own station. The phase compensating means adopts a configuration in which phase compensation is performed only for the symbol group for the own station.

According to this configuration, not only the slot allocated to the own station but also the slot allocated to the other station is received, and the phase rotation amount is estimated and calculated for each slot using the known symbol of each slot. Since the average value is calculated and the phase rotation of the received signal is compensated using the average value, it is possible to improve the accuracy of the synchronous detection process without increasing the number of known symbols added to the transmission signal.

[0029] In a receiver according to a fifth aspect of the present invention, in any one of the first to fourth aspects, the average phase rotation amount detecting means may detect the phase rotation amount for each detected symbol group. A configuration is adopted in which weighting processing is performed using an arbitrary weighting coefficient to calculate a weighted average value.

According to this configuration, the weighting circuit and the adder can perform weighted averaging without requiring a memory for temporarily storing the amount of phase rotation of a plurality of slots, so that the memory capacity can be reduced.

In the receiving apparatus according to a sixth aspect of the present invention, in the fifth aspect, the average phase rotation amount detection means delays a signal representing the detected phase rotation amount for each symbol group in bit units. Weighting is performed.

According to this configuration, the weighting processing for weighted averaging can be realized by only a bit shift without requiring a memory for temporarily storing the amount of phase rotation of a plurality of slots. The apparatus can be simplified, and the required amount of calculation can be reduced.

[0033] A communication terminal apparatus according to a seventh aspect of the present invention employs a configuration including the receiving apparatus according to any one of the first to sixth aspects.

According to this configuration, not only the slot allocated to the own station but also the slot allocated to the other station is received, and the phase rotation amount is estimated / calculated for each slot using the pilot symbol of each slot. Since the average value is obtained and the phase rotation of the received signal is compensated using the average value, the accuracy of the synchronous detection process can be improved without lowering the transmission efficiency.

[0035] The base station apparatus according to the eighth aspect of the present invention comprises:
A configuration including the receiving device according to any one of the first to sixth aspects is adopted.

According to this configuration, the communication partner station receives not only the slot allocated to its own station but also the slot allocated to the other station, and uses the pilot symbol of each slot to determine the phase rotation amount for each slot. Since the estimation and calculation are performed, the average value is obtained, and the phase rotation of the received signal is compensated using the average value, the accuracy of the synchronous detection process can be improved without lowering the transmission efficiency.

A synchronous detection method according to a ninth aspect of the present invention is characterized in that at least two radio signals are sequentially transmitted to a plurality of communication partner stations at a predetermined period, and each radio signal comprises a plurality of symbol groups each including at least a known symbol. Receiving the three symbol groups, detecting the phase rotation amount of each of the received at least two symbol groups using the known symbols, and calculating the average value of the phase rotation amounts And a phase compensation step of compensating the phase of the received signal using the calculated average phase rotation amount.

According to this method, a plurality of slots are received, a phase rotation amount is estimated / calculated for each slot, an average value thereof is obtained, and phase rotation compensation of a received signal is performed using the average value. In addition, the accuracy of the synchronous detection processing can be improved without increasing the number of known symbols added to the transmission signal.

[0039] In the synchronous detection method according to a tenth aspect of the present invention, in the ninth aspect, the average phase rotation amount detecting step may include holding the same symbol as the known symbol in advance.
Each of the known symbols of the received symbol group is multiplied by the held symbol to detect a phase rotation amount for each of the received symbol groups.

According to this method, a known symbol section of a received signal of each slot is multiplied by a known symbol held in advance, so that the phase rotation amount is estimated and calculated for each slot. Can be.

In the synchronous detection method according to an eleventh aspect of the present invention, in the ninth aspect or the tenth aspect, the known symbol is a different symbol for each of the symbol groups, and the average phase rotation amount detecting step includes: In this case, the same symbol as the known symbol included in each received symbol group is held in advance, and the symbol is multiplied by the corresponding known symbol of the received symbol group.

According to this method, even if the known symbols used for each slot in the transmission signal are different, the receiving station previously holds all the different known symbols, so that the amount of phase rotation can be estimated for each slot. -Can be calculated.

The synchronous detection method according to the twelfth aspect of the present invention is the synchronous detection method according to any one of the ninth aspect to the eleventh aspect,
At least one of the at least two received symbol groups is a signal directed to the own station, and the phase compensation step performs phase compensation only on the symbol group directed to the own station.

According to this method, not only the slot allocated to the own station but also the slot allocated to the other station is received, and the phase rotation amount is estimated and calculated for each slot using the known symbol of each slot. Since the average value is calculated and the phase rotation of the received signal is compensated using the average value, it is possible to improve the accuracy of the synchronous detection process without increasing the number of known symbols added to the transmission signal.

A synchronous detection method according to a thirteenth aspect of the present invention is the synchronous detection method according to any one of the ninth aspect to the twelfth aspect,
In the average phase rotation amount detection step, the detected phase rotation amount for each symbol group is weighted by an arbitrary weighting coefficient to calculate a weighted average value.

According to this method, the weighting circuit and the adder can perform weighted averaging without requiring a memory for temporarily storing the phase rotation amounts of a plurality of slots, so that the memory capacity can be reduced.

[0047] In a synchronous detection method according to a fourteenth aspect of the present invention, in the thirteenth aspect, the average phase rotation amount detection step includes the step of delaying a signal representing the detected phase rotation amount for each symbol group in bit units. The weighting is performed by causing the weighting.

According to this method, the weighting process for weighted averaging can be realized with a simple configuration in which only the bit shift is performed without requiring a memory for temporarily storing the phase rotation amounts of a plurality of slots. The apparatus can be simplified, and the required amount of calculation can be reduced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1) The receiving apparatus according to the present embodiment also receives a slot immediately before a slot allocated to the own station and uses it for synchronous detection.

Hereinafter, the receiving apparatus according to the present embodiment will be described with reference to FIG. 1 and FIG. FIG. 1 is a main block diagram showing a schematic configuration of a receiving apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a schematic diagram showing a state of slot reception of the receiving apparatus according to Embodiment 1 of the present invention. FIG.

Here, the receiving apparatus according to the present embodiment
Considering the mobile station of user n and using a known symbol used for the synchronous detection process as a pilot symbol, as shown in FIG.
GC symbol 204 and pilot symbol 205
And a data symbol 206.

The receiving apparatus according to the present embodiment includes not only slot 203 which is a slot allocated to its own station, but also slot 2 which is a slot immediately before slot 203.
02 is also received.

Hereinafter, the pilot symbol 205 of the slot 202 will be referred to as pilot symbol n-1, slot 2
03 is referred to as pilot symbol n.

In FIG. 1, an antenna 101 and a receiving unit 102 receive a slot 202 and a slot 203 from a downlink (DL) and perform a receiving process. The timing control section 103 controls each section according to the symbol synchronization timing acquired by the receiving section 102, and the synchronous detection circuit 104 performs synchronous detection processing on the received signal to obtain received data.

Various methods have already been proposed for obtaining the symbol synchronization timing in the receiving section 102, and it does not matter which method is used here.

The synchronous detection circuit 104 includes a known symbol extraction unit 105, multipliers 106 and 114, and a switch 10
7, 108 and 113, memories 109 and 110, an averager 111, and a conjugate complex number generator 112.

The known symbol extracting section 105 extracts and outputs the signal of the pilot symbol 205 section of the received signal (slots 202 and 203) to the multiplier 106 based on the symbol synchronization timing specified by the timing control section 103, The signal of the data symbol 206 section is multiplied by the multiplier 1
Extract and output to 14.

Here, synchronous detection circuit 104 holds pilot symbol n-1 and pilot symbol n in advance, and multiplier 106 includes known symbol extraction section 105
The signal of the pilot symbol 205 section of the slot 202 extracted by the above is multiplied by the pilot symbol n-1 held in advance, and the signal of the pilot symbol 205 section of the slot 203 is multiplied by the pilot symbol n held in advance.

Either pilot symbol n−1 or pilot symbol n is input to multiplier 106 by switch 107 that switches based on the symbol synchronization timing specified by timing control section 103.

The switch 108 is switched based on the symbol synchronization timing instructed by the timing control section 103 in the same manner as the switch 107.
The multiplication result of the pilot symbol section and the pilot symbol n-1 is output and stored in the memory 109, and the multiplication result of the pilot symbol section of the slot 203 and the pilot symbol n is stored in the memory 110.
Output and store to

In this manner, the memories 109 and 110 temporarily store the phase rotation amount estimated for the slot 202 and the phase rotation amount estimated for the slot 203, respectively.

The averaging unit 111 calculates the average value of the phase rotation amount estimated for each slot. The conjugate complex number generator 112 calculates a conjugate complex number for the average phase rotation amount output from the averaging device 111.

The switch 113 is connected to the timing controller 10
3, the output of the conjugate complex number generator 112 is input to the multiplier 114 while the signal of the data symbol 206 section of the received signal slot 203 is input to the multiplier 114. To do.

The multiplier 114 receives the slot 20 of the received signal.
The signal in the section of data symbol 206 of No. 3 is multiplied by the output of the conjugate complex number generator 112 to compensate for the amount of phase rotation of the received signal and output the received data.

Next, the operation of the receiving apparatus according to the present embodiment will be described.

In FIG. 1, slots 202 and 203 received by antenna 101 and receiving section 102 are input to known symbol extracting section 105, and known symbol extracting section 105
The signals of the five sections are sent to the multiplier 106 and the data symbols 206
The signals in the section are output to multipliers 114, respectively.

The signal in the section of pilot symbol 205 input to multiplier 106 has pilot symbol n−1 for the signal in section of pilot symbol 205 in slot 202 and pilot symbol 20 in slot 203.
The signals in the five sections are multiplied by the pilot symbols n, respectively, and the phase rotation amount in each slot is obtained.

Next, the estimated phase rotation amount for the slot 202 is temporarily stored in the memory 109, and the estimated phase rotation amount for the slot 203 is stored in the memory 1.
10 are temporarily stored, and the average value of both of them is calculated by the averager 111.

The average phase rotation amount output from the averaging unit 111 is a complex number calculated by the conjugate complex number generator 112, and the timing control is performed while the signal of the data symbol 206 section of the received signal is input to the multiplier 114. Part 103
Multiplier 11 by switch 113 controlled by
4 is multiplied by the signal of the data symbol 206 section of the slot 203 of the received signal by the multiplier 114, phase compensation is performed, and the received data is obtained.

As described above, according to the present embodiment, not only the slot allocated to the own station but also the slot allocated to another station is received, and the phase rotation is performed for each slot using the pilot symbol of each slot. Estimate and calculate the amount, take the average value of them, and use this average value to compensate the phase rotation of the received signal, so that the accuracy of the synchronous detection process can be improved without increasing the number of known symbols added to the transmitted signal. Can be improved.

It should be noted that the application of the present invention is not limited to the plurality of slots received in the process of calculating the average value being limited to the slot allocated to the own station and the slot immediately before it. The number is not limited to two slots.

(Embodiment 2) The receiving apparatus according to the present embodiment has the same configuration as that of Embodiment 1 except that one type of pilot symbol is stored in advance.

Hereinafter, the receiving apparatus according to the present embodiment will be described with reference to FIG. FIG. 3 is a main block diagram showing a schematic configuration of the receiving apparatus according to Embodiment 2 of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

In general, the pilot symbols do not necessarily have to be different for each user. Therefore, when the same pilot symbol (hereinafter referred to as a common pilot symbol) is used for signals for all users, the pilot symbol is held in advance. A configuration is adopted in which the number of pilot symbols to be used is one.

Referring to FIG. 3, synchronous detection circuit 301 holds only common pilot symbols in advance and, regardless of which slot is received, multiplier 106 uses this common pilot symbol with respect to a signal in a pilot symbol section of a received signal. To perform multiplication processing.

As described above, according to the present embodiment, when the same pilot symbol is used for signals for all users, the number of pilot symbols to be held in advance is reduced to one corresponding to the same. Can be simplified.

(Embodiment 3) The receiving apparatus according to the present embodiment has the same configuration as that of Embodiment 2 except that weighting processing is performed to reduce the memory capacity.

Hereinafter, the receiving apparatus according to the present embodiment will be described with reference to FIG. FIG. 4 is a main block diagram showing a schematic configuration of a receiving apparatus according to Embodiment 3 of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

The synchronous detection circuit 401 has a configuration in which the memory 110 is omitted as compared with the synchronous detection circuit 301 according to the second embodiment, and the memory capacity is reduced.

Here, it is assumed that two slots, slot A and slot B, containing a common pilot symbol are received, and the phase rotation amounts of these slots are averaged.

In FIG. 4, memory 109 temporarily stores the phase rotation amount of slot A received earlier. When the phase rotation amount of the slot B is calculated by the multiplier 106, the two multipliers of the weighting circuit 402 multiply the phase rotation amount of the slot A in the memory 109 by a predetermined value α, and The input phase rotation amount of the slot B is multiplied by 1-α. Here, α is 0
<Α <1 is an arbitrary value, and is preferably variable as appropriate according to the propagation environment and the like.

The output of the weighting circuit 402 is
3 to complete the weighted average processing by weighting. The calculated average value is output to the conjugate complex number generator 112.
, And the same processing as in the first and second embodiments is performed.

As described above, according to the present embodiment, the weighting circuit and the adder can perform weighted averaging without requiring a memory for temporarily storing the amount of phase rotation of a plurality of slots. Can be reduced.

(Embodiment 4) The receiving apparatus according to the present embodiment has the same configuration as that of Embodiment 3 except that weighting is omitted from the multiplier.

Hereinafter, the weighting circuit of the receiving apparatus according to the present embodiment will be described with reference to FIG. FIG. 5 is a main block diagram showing a schematic configuration of the weighting circuit of the receiving apparatus according to Embodiment 4 of the present invention.

Weighting circuit 402 according to the present embodiment
Are a 1-bit shifter 501 and a 2-bit shifter 50
2, an adder 503, and a subtractor 504,
Also, here, as in the third embodiment, it is assumed that slot A and slot B including a common pilot symbol are received, and the phase rotation amounts of these are averaged.

The phase rotation amount of each slot is 1
The signals are input to the bit shifter 501 and the 2-bit shifter 502. In digital signal processing, the amplitude is halved (0.5 times) by 1-bit shift, and thus becomes 0.25 times by 2-bit shift.

Therefore, each output of 1-bit shifter 501 has a value of 0.5 times each phase rotation amount, and each output of 2-bit shifter 502 has a value of 0.25 times each phase rotation amount. Therefore, the output of the adder 503 has a value of 0.75 times the phase rotation amount of the slot A, and the output of the subtractor 504 has a value of 0.25 times the phase rotation amount of the slot B.

As described above, the weighting circuit of the receiving apparatus according to the present embodiment has a simple configuration in which, when the predetermined value α in Embodiment 3 is 0.75, the multiplier is omitted and only the bit shift is performed. Therefore, the apparatus can be simplified, and the required amount of calculation can be reduced.

The weighting ratio is not limited to 0.75: 0.25 as long as the value can be realized by the bit shift.

In the first to fourth embodiments, the case where the number of received slots is two has been described. However, the present invention is not limited to the case where the number of received slots is two. .

[0093]

As described above, according to the present invention,
By performing synchronous detection processing using not only the pilot symbols of the slots allocated to the own station but also the pilot symbols of the slots allocated to other stations, the synchronous detection is added to the transmission signal at the transmitting station and the synchronous detection is performed at the receiving station side The accuracy of the synchronous detection processing can be improved without increasing the number of known symbols used in the processing.

[Brief description of the drawings]

FIG. 1 is a main block diagram showing a schematic configuration of a receiving apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a schematic diagram showing a state of slot reception of the receiving apparatus according to Embodiment 1 of the present invention.

FIG. 3 is a main block diagram showing a schematic configuration of a receiving apparatus according to Embodiment 2 of the present invention.

FIG. 4 is a main block diagram showing a schematic configuration of a receiving apparatus according to Embodiment 3 of the present invention.

FIG. 5 is a main part block diagram showing a schematic configuration of a weighting circuit of a receiving apparatus according to Embodiment 4 of the present invention.

FIG. 6 is a main block diagram showing a schematic configuration of a conventional receiving apparatus.

FIG. 7 is a schematic diagram showing a state of slot reception in a conventional receiving apparatus.

[Explanation of symbols]

 105 Known Symbol Extraction Unit 111 Averager 402 Weighting Circuit 501 1-Bit Shifter 502 2-Bit Shifter

Claims (14)

[Claims] A receiving means for receiving at least two symbol groups from a radio signal consisting of a plurality of symbol groups each including at least a known symbol, which is sequentially transmitted to a plurality of communication partner stations at a predetermined cycle, and Average phase rotation amount detecting means for detecting the phase rotation amount for each of at least two symbol groups using the known symbols, and calculating an average value of these phase rotation amounts, and using the calculated average phase rotation amount. And a phase compensating means for compensating the phase of the received signal. 2. The average phase rotation amount detection means holds in advance the same symbol as the known symbol, multiplies each known symbol of a received symbol group by the held symbol, and The receiving apparatus according to claim 1, wherein a phase rotation amount for each symbol group is detected. 3. The known symbol is a symbol that is different for each of the symbol groups, and the average phase rotation amount detecting means includes:
3. The received symbol group of claim 1 or 2, wherein the same symbols as the known symbols included in each received symbol group are held in advance and multiplied by the corresponding known symbols of the received symbol group. Receiving device. 4. At least one of the at least two received symbol groups is a signal for the own station, and the phase compensating means performs phase compensation only on the symbol group for the own station. Claim 1 to Claim 3
The receiving device according to any one of the above. 5. The average phase rotation amount detection means calculates a weighted average value by weighting the detected phase rotation amount for each symbol group by an arbitrary weighting coefficient. 5. The receiving device according to any one of 4. 6. The receiving apparatus according to claim 5, wherein said average phase rotation amount detection means performs weighting by delaying a signal representing the detected phase rotation amount for each symbol group in bit units. . 7. A communication terminal device comprising the receiving device according to claim 1. Description: 8. A base station apparatus for performing wireless communication with the communication terminal apparatus according to claim 7. 9. A receiving step of receiving at least two symbol groups from a radio signal composed of a plurality of symbol groups each including at least a known symbol and sequentially transmitted to a plurality of communication partner stations at a predetermined cycle; An average phase rotation amount detection step of detecting the phase rotation amount of each of at least two symbol groups using the known symbols, and calculating an average value of the phase rotation amounts, and using the calculated average phase rotation amount. A phase compensation step of compensating the phase of a received signal by using a synchronous detection method. 10. The average phase rotation amount detecting step includes, beforehand, holding the same symbol as the known symbol, multiplying each of the held symbols by each known symbol of a received symbol group, and 10. The synchronous detection method according to claim 9, wherein a phase rotation amount for each symbol group is detected. 11. The known symbol is a different symbol for each of the symbol groups, and the average phase rotation amount detecting step holds, in advance, the same symbols as the known symbols included in each of the received symbol groups, 11. The synchronous detection method according to claim 9, wherein the received symbols are respectively multiplied by known symbols. 12. At least one of the at least two received symbol groups is a signal for the own station, and the phase compensation step performs phase compensation only on the symbol group for the own station. The synchronous detection method according to any one of claims 9 to 11. 13. The method according to claim 9, wherein in the average phase rotation amount detection step, a weighted average value is calculated by performing weighting processing on the detected phase rotation amount for each symbol group using an arbitrary weighting coefficient. 13. The synchronous detection method according to any one of 12. 14. The synchronous detection according to claim 13, wherein in the average phase rotation amount detection step, weighting is performed by delaying a signal representing the detected phase rotation amount for each symbol group in bit units. Method.