JP4982323B2 - Receiving apparatus and wireless communication system - Google Patents

Receiving apparatus and wireless communication system Download PDF

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JP4982323B2
JP4982323B2 JP2007271231A JP2007271231A JP4982323B2 JP 4982323 B2 JP4982323 B2 JP 4982323B2 JP 2007271231 A JP2007271231 A JP 2007271231A JP 2007271231 A JP2007271231 A JP 2007271231A JP 4982323 B2 JP4982323 B2 JP 4982323B2
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阿部　　順一
史洋 山下
聖 小林
浩平 大幡
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Nippon Telegraph and Telephone Corp
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Description

本発明は、無線通信における周波数利用効率向上のため、同一周波数帯の複数の送信信号を使用する無線通信システム及び該無線通信システムの受信装置に関する。   The present invention relates to a radio communication system that uses a plurality of transmission signals in the same frequency band and an apparatus for receiving the radio communication system in order to improve frequency use efficiency in radio communication.

図５に示す様に、周波数利用効率向上のため、同一周波数帯の複数の送信信号を利用する無線通信システムが提案されている（例えば、非特許文献１参照。）。図５によると、無線通信システムは、送信装置と受信装置とを有し、送信装置は、変調回路７１及び７２と、周波数変換回路７３及び７４と、発振回路７５及び７６と、送信アンテナ７７及び７８を備え、受信装置は、受信アンテナ７９及び８０と、周波数変換回路８１及び８２と、発振回路８３及び８４と、周波数誤差検出回路８５及び８６と、周波数誤差補償回路８７、８８、８９及び９０と、ユニークワード（ＵＷ）マッチトフィルタ９１、９２、９３及び９４と、干渉補償回路９５と、復調回路９６及び９７とを備えている。   As shown in FIG. 5, a radio communication system using a plurality of transmission signals in the same frequency band has been proposed to improve frequency utilization efficiency (see, for example, Non-Patent Document 1). According to FIG. 5, the wireless communication system includes a transmission device and a reception device, and the transmission device includes modulation circuits 71 and 72, frequency conversion circuits 73 and 74, oscillation circuits 75 and 76, transmission antenna 77, and 78, the receiving apparatus includes receiving antennas 79 and 80, frequency conversion circuits 81 and 82, oscillation circuits 83 and 84, frequency error detection circuits 85 and 86, and frequency error compensation circuits 87, 88, 89, and 90. And unique word (UW) matched filters 91, 92, 93 and 94, an interference compensation circuit 95, and demodulation circuits 96 and 97.

図５は、例えば、衛星通信システムにおいて、２つの偏波を同時に使用する偏波多重通信を行う場合の構成である。通常の衛星通信用の送信装置は、どちらか片方の偏波のみを使用する様に設計されているため、既存の送信装置を用いて偏波多重通信を行う場合、送信装置の発振回路７５及び７６は、一般的に非同期となる。これに対応させて、図５の構成においては、送信装置の発振回路７５及び７６は非同期としている。一方、受信装置の発振回路８３及び８４は、互いに同期しているものとする。   FIG. 5 shows a configuration in the case of performing polarization multiplexing communication using two polarizations simultaneously in a satellite communication system, for example. Since a normal satellite communication transmission device is designed to use only one of the polarized waves, when performing polarization multiplexing communication using an existing transmission device, an oscillation circuit 75 of the transmission device and 76 is generally asynchronous. Corresponding to this, in the configuration of FIG. 5, the oscillation circuits 75 and 76 of the transmission apparatus are asynchronous. On the other hand, it is assumed that the oscillation circuits 83 and 84 of the receiving device are synchronized with each other.

続いて、上記無線通信システムの信号の流れについて説明する。送信装置において、変調回路７１で変調された第１の送信信号は、発振回路７５が生成する信号に基づき周波数変換回路７３で周波数変換され、送信アンテナ７７から無線信号として出力される。同様に、変調回路７２で変調された第２の送信信号は、発振回路７６が生成する信号に基づき周波数変換回路７４で周波数変換され、送信アンテナ７８から無線信号として出力される。   Next, the signal flow of the wireless communication system will be described. In the transmission device, the first transmission signal modulated by the modulation circuit 71 is frequency-converted by the frequency conversion circuit 73 based on the signal generated by the oscillation circuit 75 and output from the transmission antenna 77 as a radio signal. Similarly, the second transmission signal modulated by the modulation circuit 72 is frequency-converted by the frequency conversion circuit 74 based on the signal generated by the oscillation circuit 76 and output from the transmission antenna 78 as a radio signal.

図２は、第１の送信信号及び第２の送信信号のフレーム構成を示す図である。図２によると、第１の送信信号は、第１の周波数同期信号と、第１のユニークワードと、送信するデータである第１のデータを含んでおり、第２の送信信号は、第２の周波数同期信号と、第２のユニークワードと、送信するデータである第２のデータを含んでいる。ここで、第１の周波数同期信号が送信されている間、第２の送信信号は無信号であり、第２の周波数同期信号が送信されている間、第１の送信信号は無信号となる様に、両信号は調整される。なお、第１の周波数同期信号と、第１のユニークワードと、第２の周波数同期信号と、第２のユニークワードは、受信装置において既知のパターンであり、第１のユニークワードと第２のユニークワードは異なるパターンである。   FIG. 2 is a diagram illustrating a frame configuration of the first transmission signal and the second transmission signal. According to FIG. 2, the first transmission signal includes a first frequency synchronization signal, a first unique word, and first data that is data to be transmitted. Frequency synchronization signal, a second unique word, and second data to be transmitted. Here, while the first frequency synchronization signal is being transmitted, the second transmission signal is no signal, and while the second frequency synchronization signal is being transmitted, the first transmission signal is no signal. Similarly, both signals are adjusted. Note that the first frequency synchronization signal, the first unique word, the second frequency synchronization signal, and the second unique word are known patterns in the receiving apparatus, and the first unique word and the second unique word Unique words are different patterns.

受信装置において、受信アンテナ７９が受信する無線信号は、発振回路８３が生成する信号に基づき周波数変換回路８１で第１の中間信号に周波数変換される。同様に、受信アンテナ８０が受信する無線信号は、発振回路８４が生成する信号に基づき周波数変換回路８２で第２の中間信号に周波数変換される。   In the receiving apparatus, the radio signal received by the receiving antenna 79 is frequency-converted into a first intermediate signal by the frequency converting circuit 81 based on the signal generated by the oscillation circuit 83. Similarly, the radio signal received by the receiving antenna 80 is frequency converted into a second intermediate signal by the frequency conversion circuit 82 based on the signal generated by the oscillation circuit 84.

ここで、受信アンテナ７９が受信する無線信号と、受信アンテナ８０が受信する無線信号は、それぞれ、第１の送信信号と第２の送信信号が混在したものである。つまり、発振回路７５の周波数をｆｔ１、発振回路７６の周波数をｆｔ２、発振回路８３及び８４の周波数をｆｒとすると、第１の中間信号及び第２の中間信号は、それぞれ、Δｆ１＝ｆｔ１−ｆｒの周波数誤差を有する第１の送信信号成分と、Δｆ２＝ｆｔ２−ｆｒの周波数誤差を有する第２の送信信号成分の混在信号となる。しかしながら、図２に示す第１の送信信号及び第２の送信信号の関係から明らかな様に、第１の周波数同期信号と第２の周波数同期信号は、互いに他の信号からの影響を受けない。したがって、図６にそのフレーム構成を示す様に、第１の中間信号及び第２の中間信号は、第１の周波数同期信号の区間においては、Δｆ１の周波数誤差を有する第１の送信信号成分のみを含み、第２の周波数同期信号の区間においては、Δｆ２の周波数誤差を有する第２の送信信号成分のみを含んだものとなる。 Here, the radio signal received by the reception antenna 79 and the radio signal received by the reception antenna 80 are a mixture of the first transmission signal and the second transmission signal, respectively. That is, frequency f t1 of the oscillation circuit 75, the frequency f t2 of the oscillation circuit 76, when the frequency of the oscillation circuit 83 and 84 and f r, the first intermediate signal and the second intermediate signal, respectively, Delta] f 1 = a first transmission signal component having a frequency error of f t1 -f r, a second mixed signal of the transmission signal components having a frequency error Δf 2 = f t2 -f r. However, as is apparent from the relationship between the first transmission signal and the second transmission signal shown in FIG. 2, the first frequency synchronization signal and the second frequency synchronization signal are not affected by other signals. . Therefore, as shown in FIG. 6, the first intermediate signal and the second intermediate signal are the first transmission signal component having a frequency error of Δf 1 in the first frequency synchronization signal section. In the second frequency synchronization signal section, only the second transmission signal component having a frequency error of Δf 2 is included.

周波数誤差検出回路８５は、第１の中間信号及び第２の中間信号の第１の周波数同期信号の区間から周波数誤差Δｆ１を検出し、平滑化したものを周波数誤差補償回路８７及び９０に出力する。同様に、周波数誤差検出回路８６は、第１の中間信号及び第２の中間信号の第２の周波数同期信号の区間から周波数誤差Δｆ２を検出し、平滑化したものを周波数誤差補償回路８８及び８９に出力する。 The frequency error detection circuit 85 detects the frequency error Δf 1 from the section of the first frequency synchronization signal of the first intermediate signal and the second intermediate signal, and outputs the smoothed one to the frequency error compensation circuits 87 and 90. To do. Similarly, the frequency error detection circuit 86 detects the frequency error Δf 2 from the section of the second frequency synchronization signal of the first intermediate signal and the second intermediate signal, and smoothes the detected frequency error Δf 2. Output to 89.

周波数誤差補償回路８７は、周波数誤差Δｆ１に基づき第１の中間信号の周波数誤差の補償を行い、周波数誤差補償回路９０は、周波数誤差Δｆ１に基づき第２の中間信号の周波数誤差の補償を行う。よって、周波数誤差補償回路８７及び９０が出力する信号は、それぞれ、周波数誤差のない第１の送信信号成分と、周波数誤差が、Δｆ２−Δｆ１である第２の送信信号成分を含んだものとなる。 The frequency error compensation circuit 87 compensates the frequency error of the first intermediate signal based on the frequency error Δf 1 , and the frequency error compensation circuit 90 compensates the frequency error of the second intermediate signal based on the frequency error Δf 1. Do. Therefore, the signals output from the frequency error compensation circuits 87 and 90 each include a first transmission signal component having no frequency error and a second transmission signal component having a frequency error of Δf 2 −Δf 1 . It becomes.

同様に、周波数誤差補償回路８８は、周波数誤差Δｆ２に基づき第１の中間信号の周波数誤差の補償を行い、周波数誤差補償回路８９は、周波数誤差Δｆ２に基づき第２の中間信号の周波数誤差の補償を行う。よって周波数誤差補償回路８８及び８９が出力する信号は、それぞれ、周波数誤差がΔｆ１−Δｆ２である第１の送信信号成分と、周波数誤差のない第２の送信信号成分を含んだものとなる。 Similarly, the frequency error compensation circuit 88 compensates the frequency error of the first intermediate signal based on the frequency error Δf 2 , and the frequency error compensation circuit 89 performs the frequency error of the second intermediate signal based on the frequency error Δf 2. To compensate. Therefore, the signals output from the frequency error compensation circuits 88 and 89 each include a first transmission signal component having a frequency error of Δf 1 −Δf 2 and a second transmission signal component having no frequency error. .

ＵＷマッチトフィルタ９１は、周波数誤差補償回路８７の出力信号のユニークワードのタイミングにおいて、当該出力信号と第１のユニークワードとの畳み込み演算を行い、第１の中間信号における第１の送信信号の割合である伝搬路行列成分ｈ１１を出力し、ＵＷマッチトフィルタ９４は、周波数誤差補償回路９０の出力信号のユニークワードのタイミングにおいて、当該出力信号と第１のユニークワードとの畳み込み演算を行い、第２の中間信号における第１の送信信号の割合である伝搬路行列成分ｈ２１を出力する。ここで、周波数誤差補償回路８７及び９０の出力信号において、第１の送信信号成分については、周波数誤差が０であるため、伝搬路行列成分ｈ１１及びｈ２１の推定は、周波数誤差の影響を受けない。 The UW matched filter 91 performs a convolution operation between the output signal and the first unique word at the timing of the unique word of the output signal of the frequency error compensation circuit 87, and performs the first transmission signal of the first intermediate signal. outputs channel matrix component h 11 is the proportion, UW matched filter 94 at the timing of the unique word of the output signal of the frequency error compensation circuit 90 performs a convolution operation between the output signal and the first unique word The propagation path matrix component h 21 which is the ratio of the first transmission signal in the second intermediate signal is output. Here, in the output signals of the frequency error compensation circuits 87 and 90, since the frequency error is zero for the first transmission signal component, the estimation of the propagation path matrix components h 11 and h 21 is influenced by the frequency error. I do not receive it.

同様に、ＵＷマッチトフィルタ９２は、周波数誤差補償回路８８の出力信号のユニークワードのタイミングにおいて、当該出力信号と第２のユニークワードとの畳み込み演算を行い、第１の中間信号における第２の送信信号の割合である伝搬路行列成分ｈ１２を出力し、ＵＷマッチトフィルタ９３は、周波数誤差補償回路８９の出力信号のユニークワードのタイミングにおいて、当該出力信号と第２のユニークワードとの畳み込み演算を行い、第２の中間信号における第２の送信信号の割合である伝搬路行列成分ｈ２２を出力する。ここで、周波数誤差補償回路８８及び８９の出力信号において、第２の送信信号成分については、周波数誤差が０であるため、伝搬路行列成分ｈ１２及びｈ２２の推定は、周波数誤差の影響を受けない。 Similarly, the UW matched filter 92 performs a convolution operation between the output signal and the second unique word at the timing of the unique word of the output signal of the frequency error compensation circuit 88, and performs the second operation on the first intermediate signal. The propagation path matrix component h 12 that is the ratio of the transmission signal is output, and the UW matched filter 93 convolves the output signal with the second unique word at the timing of the unique word of the output signal of the frequency error compensation circuit 89. An operation is performed, and a propagation path matrix component h 22 that is a ratio of the second transmission signal in the second intermediate signal is output. Here, in the output signals of the frequency error compensation circuits 88 and 89, since the frequency error is zero for the second transmission signal component, the estimation of the propagation path matrix components h 12 and h 22 is influenced by the frequency error. I do not receive it.

干渉補償回路９５は、伝搬路行列成分ｈ１１、ｈ１２、ｈ２１及びｈ２２用い、第１の中間信号及び第２の中間信号から、第１の送信信号に対応する第１の受信信号と、第２の送信信号に対応する第２の受信信号を、それぞれ、取り出し、復調回路９６は、第１の受信信号を復調し、復調回路９７は、第２の受信信号を復調する。 The interference compensation circuit 95 uses the propagation path matrix components h 11 , h 12 , h 21 and h 22 , and from the first intermediate signal and the second intermediate signal, the first received signal corresponding to the first transmission signal and The second reception signal corresponding to the second transmission signal is extracted, the demodulation circuit 96 demodulates the first reception signal, and the demodulation circuit 97 demodulates the second reception signal.

Ｆｕｍｉｈｉｒｏ Ｙａｍａｓｈｉｔａ、ｅｔ ａｌ、“Ｖａｒｉａｂｌｅ Ｐｏｌａｒｉｚａｔｉｏｎ Ｆｒｅｑｕｅｎｃｙ Ｄｉｖｉｓｉｏｎ Ｍｕｌｔｉｐｌｅｘｉｎｇ （ＶＰＦＤＭ） ｆｏｒ ｓａｔｅｌｌｉｔｅ ｃｏｍｍｕｎｉｃａｔｉｏｎｓ”、ＡＩＡＡ ＩＣＳＳＣ ＡＩＡＡ-２００７−３２４４、２００７年４月Fumihiro Yamashita, et al, “Variable Polarization Frequency Multiplexing (VPFDM) for satellite communication”, AAAA ICSSC AIAA-2007-44.

図５に示す構成は、受信装置の発振回路８３と８４が互いに同期していることを前提としている。しかしながら、図５の構成をより一般化し、発振回路８３と８４が非同期であり、発振回路８３の発振周波数がｆｒ１、発振回路８４の発振周波数がｆｒ２である場合を想定する。この場合、第１の中間信号は、周波数誤差がΔｆ１１＝ｆｔ１−ｆｒ１である第１の送信信号成分と、周波数誤差がΔｆ１２＝ｆｔ２−ｆｒ１である第２の送信信号成分の混在信号となり、第２の中間信号は、周波数誤差がΔｆ２１＝ｆｔ１−ｆｒ２である第１の送信信号成分と、周波数誤差がΔｆ２２＝ｆｔ２−ｆｒ２である第２の送信信号成分の混在信号となる。 The configuration shown in FIG. 5 is based on the premise that the oscillation circuits 83 and 84 of the receiving apparatus are synchronized with each other. However, it is assumed that the configuration of FIG. 5 is more generalized, and the oscillation circuits 83 and 84 are asynchronous, the oscillation frequency of the oscillation circuit 83 is f r1 , and the oscillation frequency of the oscillation circuit 84 is f r2 . In this case, the first intermediate signal includes a first transmission signal component whose frequency error is Δf 11 = f t1 −f r1 and a second transmission signal component whose frequency error is Δf 12 = f t2 −f r1. The second intermediate signal includes a first transmission signal component having a frequency error of Δf 21 = f t1 −f r2 and a second transmission having a frequency error of Δf 22 = f t2 −f r2. It becomes a mixed signal of signal components.

周波数誤差検出回路８５は、第１の中間信号及び第２の中間信号からΔｆ１１とΔｆ１２の平均周波数誤差Δｆ３を検出して、周波数誤差補償回路８７及び９０に出力し、周波数誤差検出回路８６は、第１の中間信号及び第２の中間信号からΔｆ２１とΔｆ２２の平均周波数誤差Δｆ４を検出して、周波数誤差補償回路８８及び８９に出力する。 The frequency error detection circuit 85 detects the average frequency error Δf 3 of Δf 11 and Δf 12 from the first intermediate signal and the second intermediate signal, and outputs the average frequency error Δf 3 to the frequency error compensation circuits 87 and 90, so that the frequency error detection circuit 86 detects the average frequency error Δf 4 of Δf 21 and Δf 22 from the first intermediate signal and the second intermediate signal, and outputs them to the frequency error compensation circuits 88 and 89.

周波数誤差補償回路８７は、第１の中間信号に対してΔｆ３の周波数補償を行い出力するが、Δｆ３とΔｆ１１は異なる値であるため、周波数誤差補償回路８７が出力する信号は、Δｆ１１−Δｆ３と、Δｆ１２−Δｆ３の、２つの周波数誤差を有する信号の混在となる。同様に、周波数誤差補償回路９０が出力する信号は、Δｆ２１−Δｆ３と、Δｆ２２−Δｆ３の、２つの周波数誤差を有する信号の混在となり、周波数誤差補償回路８８が出力する信号は、Δｆ１１−Δｆ４と、Δｆ１２−Δｆ４の、２つの周波数誤差を有する信号の混在となり、周波数誤差補償回路８９が出力する信号は、Δｆ２１−Δｆ４と、Δｆ２２−Δｆ４の、２つの周波数誤差を有する信号の混在となる。 The frequency error compensation circuit 87 performs frequency compensation of Δf 3 on the first intermediate signal and outputs it. However, since Δf 3 and Δf 11 are different values, the signal output by the frequency error compensation circuit 87 is Δf A signal having two frequency errors, 11 −Δf 3 and Δf 12 −Δf 3 , is mixed. Similarly, the signal output from the frequency error compensation circuit 90 is a mixture of signals having two frequency errors, Δf 21 −Δf 3 and Δf 22 −Δf 3 , and the signal output from the frequency error compensation circuit 88 is A signal having two frequency errors, Δf 11 −Δf 4 and Δf 12 −Δf 4 , is mixed, and signals output from the frequency error compensation circuit 89 are Δf 21 −Δf 4 and Δf 22 −Δf 4 . A signal having two frequency errors is mixed.

つまり、ＵＷマッチトフィルタ９１、９２、９３及び９４は、周波数誤差を有するユニークワードとの相関を検出することとなり、伝搬路行列の推定精度が劣化し、これにより、干渉補償回路９５での補償精度も劣化するという問題がある。   That is, the UW matched filters 91, 92, 93 and 94 detect the correlation with the unique word having the frequency error, and the estimation accuracy of the propagation path matrix is deteriorated. There is a problem that accuracy also deteriorates.

したがって、本発明は、同一周波数帯の複数の信号を使用する無線システム、つまり空間多重無線通信システムにおいて、送信装置及び受信装置の発振回路が、それぞれ、非同期であっても、品質劣化を生じさせない受信装置及び無線通信システムを提供することを目的とする。   Therefore, the present invention does not cause quality degradation in a wireless system using a plurality of signals in the same frequency band, that is, in a spatial multiplexing wireless communication system, even if the oscillation circuits of the transmission device and the reception device are each asynchronous. An object is to provide a receiving apparatus and a wireless communication system.

本発明における受信装置によれば、
空間多重された第１の送信信号及び第２の送信信号を受信する受信装置であって、第１の受信アンテナと、第２の受信アンテナと、第１の受信アンテナが受信する信号を周波数変換し、第１の中間信号を出力する第１の受信周波数変換手段と、第２の受信アンテナが受信する信号を、第１の受信周波数変換手段とは異なる発振手段を用いて周波数変換し、第２の中間信号を出力する第２の受信周波数変換手段と、第１の中間信号の周波数補償を行う第１の周波数誤差補償手段と、第２の中間信号の周波数補償を行う第２の周波数誤差補償手段と、第１の中間信号及び第２の中間信号の周波数補償を行って伝搬路行列を算出する手段と、伝搬路行列に基づき第１の周波数誤差補償手段の出力信号と、第２の周波数誤差補償手段の出力信号から第１の送信信号に対応する第１の受信信号と、第２の送信信号に対応する第２の受信信号を生成する干渉補償手段とを備えている。 According to the receiving device of the present invention,
A receiving device that receives a first transmission signal and a second transmission signal that are spatially multiplexed, and frequency-converts signals received by the first reception antenna, the second reception antenna, and the first reception antenna. Then, the first receiving frequency converting means for outputting the first intermediate signal and the signal received by the second receiving antenna are frequency-converted using an oscillating means different from the first receiving frequency converting means, A second reception frequency converting means for outputting the intermediate signal of the second, a first frequency error compensating means for compensating the frequency of the first intermediate signal, and a second frequency error for compensating the frequency of the second intermediate signal. Compensation means; means for performing frequency compensation of the first intermediate signal and the second intermediate signal to calculate a propagation path matrix; an output signal of the first frequency error compensation means based on the propagation path matrix; From the output signal of the frequency error compensation means And it includes a first reception signal corresponding to the transmission signal, and the interference compensation unit for generating a second received signal corresponding to the second transmission signal.

本発明の受信装置における他の実施形態よれば、
第１の中間信号に含まれる第１の送信信号成分が受けた第１の周波数誤差、第１の中間信号に含まれる第２の送信信号成分が受けた第２の周波数誤差、第２の中間信号に含まれる第１の送信信号成分が受けた第３の周波数誤差、及び、第２の中間信号に含まれる第２の送信信号成分が受けた第４の周波数誤差を検出する周波数誤差検出手段を、更に、備えており、第１の周波数誤差補償手段は、第１の周波数誤差と第２の周波数誤差の和に基づき第１の中間信号の周波数補償を行い、第２の周波数誤差補償手段は、第３の周波数誤差と第４の周波数誤差の和に基づき第２の中間信号の周波数補償を行うことも好ましい。 According to another embodiment of the receiving device of the present invention,
The first frequency error received by the first transmission signal component included in the first intermediate signal, the second frequency error received by the second transmission signal component included in the first intermediate signal, and the second intermediate Frequency error detection means for detecting a third frequency error received by the first transmission signal component included in the signal and a fourth frequency error received by the second transmission signal component included in the second intermediate signal The first frequency error compensating means performs frequency compensation of the first intermediate signal based on the sum of the first frequency error and the second frequency error, and the second frequency error compensating means. It is also preferable to perform frequency compensation of the second intermediate signal based on the sum of the third frequency error and the fourth frequency error.

本発明の受信装置における他の実施形態よれば、
伝搬路行列を算出する手段は、第１の周波数誤差に基づき第１の中間信号の周波数補償を行う第３の周波数誤差補償手段と、第２の周波数誤差に基づき第１の中間信号の周波数補償を行う第４の周波数誤差補償手段と、第３の周波数誤差に基づき第２の中間信号の周波数補償を行う第５の周波数誤差補償手段と、第４の周波数誤差に基づき第２の中間信号の周波数補償を行う第６の周波数誤差補償手段と、第３、第４、第５及び第６の周波数誤差補償手段の出力信号から伝搬路行列成分を出力する手段とを備えていることも好ましい。 According to another embodiment of the receiving device of the present invention,
The means for calculating the propagation path matrix includes third frequency error compensation means for performing frequency compensation of the first intermediate signal based on the first frequency error, and frequency compensation for the first intermediate signal based on the second frequency error. A fourth frequency error compensating means for performing the second frequency error compensating means for compensating the frequency of the second intermediate signal based on the third frequency error, and a second frequency error compensating means for performing the frequency compensation of the second intermediate signal based on the fourth frequency error. It is also preferable to include sixth frequency error compensating means for performing frequency compensation and means for outputting a propagation path matrix component from the output signals of the third, fourth, fifth and sixth frequency error compensating means.

更に、本発明の無線受信装置における他の実施形態よれば、
第１の送信信号は、第１の特定パターンを含み、第２の送信信号は、第２の特定パターンを含み、伝搬路行例は、第３の周波数誤差補償手段の出力信号と第１の特定パターンとの相関と、第４の周波数誤差補償手段の出力信号と第２の特定パターンとの相関と、第５の周波数誤差補償手段の出力信号と第１の特定パターンとの相関と、第６の周波数誤差補償手段の出力信号と第２の特定パターンとの相関とにより算出することも好ましい。 Furthermore, according to another embodiment of the wireless receiver of the present invention,
The first transmission signal includes the first specific pattern, the second transmission signal includes the second specific pattern, and the propagation path example includes the output signal of the third frequency error compensating means and the first A correlation between the specific pattern, a correlation between the output signal of the fourth frequency error compensation means and the second specific pattern, a correlation between the output signal of the fifth frequency error compensation means and the first specific pattern, It is also preferable to calculate based on the correlation between the output signal of the frequency error compensating means 6 and the second specific pattern.

更に、本発明の無線受信装置における他の実施形態よれば、
第５の周波数誤差に基づき、第１の受信信号の周波数補償を行う第７の周波数誤差補償手段と、第５の周波数誤差とは絶対値が同一で、その符号が反転する第６の周波数誤差に基づき、第２の受信信号の周波数補償を行う第８の周波数誤差補償手段とを備えており、第５の周波数誤差は、第１の周波数誤差と第２の周波数誤差の差、又は、第３の周波数誤差と第４の周波数誤差の差に基づき算出されることも好ましい。 Furthermore, according to another embodiment of the wireless receiver of the present invention,
The seventh frequency error compensation means for compensating the frequency of the first received signal based on the fifth frequency error, and the fifth frequency error have the same absolute value and the sixth frequency error whose sign is inverted. And an eighth frequency error compensation means for performing frequency compensation of the second received signal, and the fifth frequency error is the difference between the first frequency error and the second frequency error, or It is also preferable to calculate based on the difference between the frequency error 3 and the fourth frequency error.

更に、本発明の無線受信装置における他の実施形態よれば、
第１の送信信号及び第２の送信信号は、それぞれ、無信号である区間を含み、第１の周波数誤差は、第１の送信信号が無信号ではなく、かつ、第２の送信信号が無信号である区間における第１の中間信号から検出し、第２の周波数誤差は、第１の送信信号が無信号であり、かつ、第２の送信信号が無信号でない区間における第１の中間信号から検出し、第３の周波数誤差は、第１の送信信号が無信号ではなく、かつ、第２の送信信号が無信号である区間における第２の中間信号から検出し、第４の周波数誤差は、第１の送信信号が無信号であり、かつ、第２の送信信号が無信号でない区間における第２の中間信号から検出することも好ましい。 Furthermore, according to another embodiment of the wireless receiver of the present invention,
Each of the first transmission signal and the second transmission signal includes a section in which there is no signal, and the first frequency error is that the first transmission signal is not a signal and the second transmission signal is not a signal. The second frequency error detected from the first intermediate signal in a section that is a signal is the first intermediate signal in a section in which the first transmission signal is no signal and the second transmission signal is not a signal. And the third frequency error is detected from the second intermediate signal in a section where the first transmission signal is not a no-signal and the second transmission signal is a no-signal. It is also preferable to detect from the second intermediate signal in a section where the first transmission signal is no signal and the second transmission signal is not a signal.

本発明における無線通信システムによれば、
前記受信装置と、送信装置とを有する無線通信システムであって、送信装置は、第１の送信信号を周波数変換する第１の送信周波数変換手段と、第２の送信信号を、第１の送信周波数変換手段とは異なる発振手段を用いて周波数変換する第２の送信周波数変換手段とを備えている。 According to the wireless communication system of the present invention,
A wireless communication system including the reception device and a transmission device, wherein the transmission device converts a first transmission signal to a first transmission frequency and a second transmission signal to the first transmission. And a second transmission frequency converting means for performing frequency conversion using an oscillating means different from the frequency converting means.

本発明による受信装置は、空間的に多重された第１の送信信号及び第２の送信信号から、伝搬経路毎に周波数誤差を個別推定し、推定した周波数誤差を用いて第１の中間信号及び第２の中間信号に混在している各周波数誤差を個別に補償することで、周波数誤差の影響を受けずに伝搬路行列の推定を行う。これにより、信号間干渉を精度良く補償し、よって、復調後の信号品質の劣化を抑えることができる。本発明を用いることで、ＲＦ装置の選択に柔軟性が増し、装置コストを低減することができる。   The receiving apparatus according to the present invention individually estimates the frequency error for each propagation path from the first transmission signal and the second transmission signal that are spatially multiplexed, and uses the estimated frequency error to generate the first intermediate signal and By individually compensating each frequency error mixed in the second intermediate signal, the propagation path matrix is estimated without being affected by the frequency error. As a result, inter-signal interference can be compensated with high accuracy, and degradation of signal quality after demodulation can be suppressed. By using the present invention, flexibility in selecting an RF device can be increased, and the device cost can be reduced.

本発明を実施するための最良の実施形態について、以下では図面を用いて詳細に説明する。   The best mode for carrying out the present invention will be described in detail below with reference to the drawings.

図１は、本発明による無線通信システムの構成図であり、無線通信システムは、送信装置と受信装置を含んでいる。図１によると、送信装置は、変調回路１１及び１２と、周波数変換回路１３及び１４と、発振回路１５及び１６と、送信アンテナ１７及び１８とを備えている。   FIG. 1 is a configuration diagram of a wireless communication system according to the present invention, and the wireless communication system includes a transmission device and a reception device. According to FIG. 1, the transmission apparatus includes modulation circuits 11 and 12, frequency conversion circuits 13 and 14, oscillation circuits 15 and 16, and transmission antennas 17 and 18.

周波数変換回路１３は、変調回路１１で変調された第１の送信信号を発振回路１５が出力する周波数ｆｔ１の信号に基づき周波数変換し、送信アンテナ１７は、周波数変換された第１の送信信号を無線信号として出力する。同様に、周波数変換回路１４は、変調回路１２で変調された第２の送信信号を発振回路１６が出力する周波数ｆｔ２の信号に基づき周波数変換し、送信アンテナ１８は、周波数変換された第２の送信信号を無線信号として出力する。本発明において、発振回路１５と、発振回路１６とは異なるもの、つまり、非同期であり、よって、周波数変換回路１３の出力信号の周波数と、周波数変換回路１４の出力信号の周波数は、一般的には一致せず、ずれが生ずることになる。 The frequency conversion circuit 13 converts the frequency of the first transmission signal modulated by the modulation circuit 11 based on the signal of the frequency f t1 output from the oscillation circuit 15, and the transmission antenna 17 converts the frequency-converted first transmission signal. Is output as a radio signal. Similarly, the frequency conversion circuit 14 converts the frequency of the second transmission signal modulated by the modulation circuit 12 based on the signal of the frequency ft2 output from the oscillation circuit 16, and the transmission antenna 18 converts the frequency-converted second transmission signal. Are transmitted as radio signals. In the present invention, the oscillating circuit 15 and the oscillating circuit 16 are different, that is, asynchronous. Therefore, the frequency of the output signal of the frequency converting circuit 13 and the frequency of the output signal of the frequency converting circuit 14 are generally Will not match, and a shift will occur.

図２は、第１の送信信号及び第２の送信信号のフレーム構成を示す図である。図２によると、第１の送信信号は、第１の周波数同期信号と、第１のユニークワードと、送信するデータである第１のデータを含んでおり、第２の送信信号は、第２の周波数同期信号と、第２のユニークワードと、送信するデータである第２のデータを含んでいる。ここで、第１の周波数同期信号が送信されている間、第２の送信信号は無信号であり、第２の周波数同期信号が送信されている間、第１の送信信号は無信号となる様に、両信号は調整される。なお、第１の周波数同期信号と、第１のユニークワードと、第２の周波数同期信号と、第２のユニークワードは、受信装置において既知の特定パターンであり、第１のユニークワードと第２のユニークワードは、異なるパターンである。   FIG. 2 is a diagram illustrating a frame configuration of the first transmission signal and the second transmission signal. According to FIG. 2, the first transmission signal includes a first frequency synchronization signal, a first unique word, and first data that is data to be transmitted. Frequency synchronization signal, a second unique word, and second data to be transmitted. Here, while the first frequency synchronization signal is being transmitted, the second transmission signal is no signal, and while the second frequency synchronization signal is being transmitted, the first transmission signal is no signal. Similarly, both signals are adjusted. The first frequency synchronization signal, the first unique word, the second frequency synchronization signal, and the second unique word are known specific patterns in the receiving device, and the first unique word and the second unique word The unique word is a different pattern.

また、図１によると、本発明による受信装置は、受信アンテナ１９及び２０と、周波数変換回路２１及び２２と、発振回路２３及び２４と、周波数誤差検出回路２５、２６、２７及び２８と、周波数誤差補償値制御回路２９と、周波数誤差補償回路３０、３１、３２、３３、３８、３９、４１及び４２と、ＵＷマッチトフィルタ３４、３５、３６及び３７と、干渉補償回路４０と、復調回路４３及び４４とを備えている。   Further, according to FIG. 1, the receiving apparatus according to the present invention includes receiving antennas 19 and 20, frequency conversion circuits 21 and 22, oscillation circuits 23 and 24, frequency error detection circuits 25, 26, 27 and 28, frequency Error compensation value control circuit 29, frequency error compensation circuits 30, 31, 32, 33, 38, 39, 41 and 42, UW matched filters 34, 35, 36 and 37, interference compensation circuit 40, and demodulation circuit 43 and 44.

周波数変換回路２１は、受信アンテナ１９が受信した無線信号を、発振回路２３が出力する周波数ｆｒ１の信号に基づき周波数変換して第１の中間信号を出力し、周波数変換回路２２は、受信アンテナ２０が受信した無線信号を、発振回路２４が出力する周波数ｆｒ２の信号に基づき周波数変換して第２の中間信号を出力する。送信装置と同様、本発明において、発振回路２３と、発振回路２４は、それぞれ独立して発振、つまり、非同期である。 The frequency conversion circuit 21 converts the radio signal received by the receiving antenna 19 based on the signal of the frequency fr1 output from the oscillation circuit 23 and outputs a first intermediate signal. The frequency conversion circuit 22 The radio signal received by the frequency converter 20 is frequency-converted based on the signal of the frequency fr2 output from the oscillation circuit 24, and a second intermediate signal is output. Similar to the transmission device, in the present invention, the oscillation circuit 23 and the oscillation circuit 24 are independently oscillated, that is, asynchronous.

ここで、受信アンテナ１９が受信する無線信号と、受信アンテナ２０が受信する無線信号は、それぞれ、第１の送信信号成分と第２の送信信号成分が混在したものであり、そのフレーム構成を図３に示す。図２に示す第１の送信信号及び第２の送信信号の関係から明らかな様に、第１の中間信号及び第２の中間信号それぞれにおいて、第１の周波数同期信号と第２の周波数同期信号は、他の信号から影響を受けない。したがって、図３に示す様に、第１の中間信号の、第１の周波数同期信号の区間は、周波数誤差Δｆ１１＝Δｆｔ１−Δｆｒ１である第１の送信信号成分のみであり、第２の周波数同期信号の区間は、周波数誤差Δｆ１２＝Δｆｔ２−Δｆｒ１である第２の送信信号成分のみであり、その他の区間は、周波数誤差Δｆ１１である第１の送信信号成分と、周波数誤差Δｆ１２である第２の送信信号成分の混在信号である。同様に、第２の中間信号の、第１の周波数同期信号の区間は、周波数誤差Δｆ２１＝Δｆｔ１−Δｆｒ２である第１の送信信号成分のみであり、第２の周波数同期信号の区間は、周波数誤差Δｆ２２＝Δｆｔ２−Δｆｒ２である第２の送信信号成分のみであり、その他の区間は、周波数誤差Δｆ２１である第１の送信信号成分と、周波数誤差Δｆ２２である第２の送信信号成分の混在信号である。 Here, the radio signal received by the receiving antenna 19 and the radio signal received by the receiving antenna 20 are each a mixture of the first transmission signal component and the second transmission signal component, and the frame configuration thereof is illustrated. 3 shows. As is apparent from the relationship between the first transmission signal and the second transmission signal shown in FIG. 2, the first frequency synchronization signal and the second frequency synchronization signal in each of the first intermediate signal and the second intermediate signal. Is not affected by other signals. Therefore, as shown in FIG. 3, the section of the first frequency synchronization signal of the first intermediate signal is only the first transmission signal component having the frequency error Δf 11 = Δf t1 −Δf r1 , The interval of the frequency synchronization signal is only the second transmission signal component having the frequency error Δf 12 = Δf t2 −Δf r1 , and the other interval is the first transmission signal component having the frequency error Δf 11 and the frequency a second mixed signal of the transmission signal component of the error Delta] f 12. Similarly, the section of the first frequency synchronization signal of the second intermediate signal is only the first transmission signal component having the frequency error Δf 21 = Δf t1 −Δf r2 , and the section of the second frequency synchronization signal. Is only the second transmission signal component with frequency error Δf 22 = Δf t2 −Δf r2 , and the other interval is the first transmission signal component with frequency error Δf 21 and the first error with frequency error Δf 22 . 2 is a mixed signal of two transmission signal components.

周波数誤差検出回路２５は、第１の中間信号における第１の周波数同期信号の区間から周波数誤差Δｆ１１を検出し、周波数誤差検出回路２６は、第１の中間信号における第２の周波数同期信号の区間から周波数誤差Δｆ１２を検出し、周波数誤差検出回路２７は、第２の中間信号における第１の周波数同期信号の区間から周波数誤差Δｆ２１を検出し、周波数誤差検出回路２８は、第２の中間信号における第２の周波数同期信号の区間から周波数誤差Δｆ２２を検出し、それぞれ、周波数誤差補償値制御回路２９に出力する。 The frequency error detection circuit 25 detects the frequency error Δf 11 from the section of the first frequency synchronization signal in the first intermediate signal, and the frequency error detection circuit 26 detects the second frequency synchronization signal in the first intermediate signal. The frequency error Δf 12 is detected from the section, the frequency error detection circuit 27 detects the frequency error Δf 21 from the section of the first frequency synchronization signal in the second intermediate signal, and the frequency error detection circuit 28 The frequency error Δf 22 is detected from the section of the second frequency synchronization signal in the intermediate signal and output to the frequency error compensation value control circuit 29, respectively.

周波数誤差補償値制御回路２９は、Δｆ１１、Δｆ１２、Δｆ２１、Δｆ２２から、以下の式に基づきΔｆｈ１、Δｆｈ２、Δｆａ、Δｆｂを算出し、Δｆ１１を周波数誤差補償回路３０に、Δｆ１２を周波数誤差補償回路３１に、Δｆ２１を周波数誤差補償回路３２に、Δｆ２２を周波数誤差補償回路３３に、Δｆｈ１を周波数誤差補償回路３８に、Δｆｈ２を周波数誤差補償回路３９に、Δｆａを周波数誤差補償回路４１に、Δｆｂを周波数誤差補償回路４２に出力する。
Δｆｈ１＝（Δｆ１１＋Δｆ１２）／２＝（ｆｔ１＋ｆｔ２）／２−ｆｒ１
Δｆｈ２＝（Δｆ２１＋Δｆ２２）／２＝（ｆｔ１＋ｆｔ２）／２−ｆｒ２
Δｆａ＝（Δｆ１１−Δｆ１２）／２＝（Δｆ２１−Δｆ２２）／２＝（ｆｔ１−ｆｔ２）／２
Δｆｂ＝（Δｆ１２−Δｆ１１）／２＝（Δｆ２２−Δｆ１２）／２＝（ｆｔ２−ｆｔ１）／２ The frequency error compensation value control circuit 29 calculates Δf h1 , Δf h2 , Δf a , and Δf b from Δf 11 , Δf 12 , Δf 21 , and Δf 22 based on the following expressions, and Δf 11 is used as the frequency error compensation circuit 30. Δf 12 is the frequency error compensation circuit 31, Δf 21 is the frequency error compensation circuit 32, Δf 22 is the frequency error compensation circuit 33, Δf h1 is the frequency error compensation circuit 38, and Δf h2 is the frequency error compensation circuit 39. In addition, Δf a is output to the frequency error compensation circuit 41, and Δf b is output to the frequency error compensation circuit 42.
Δf h1 = (Δf 11 + Δf 12 ) / 2 = (f t1 + f t2 ) / 2−f r1
Δf h2 = (Δf 21 + Δf 22 ) / 2 = (f t1 + f t2 ) / 2−f r2
Δf a = (Δf 11 −Δf 12 ) / 2 = (Δf 21 −Δf 22 ) / 2 = (f t1 −f t2 ) / 2
Δf b = (Δf 12 −Δf 11 ) / 2 = (Δf 22 −Δf 12 ) / 2 = (f t2 −f t1 ) / 2

周波数誤差補償回路３８は、Δｆｈ１を用いて第１の中間信号の周波数誤差補償を行う。したがって、周波数誤差補償回路３８が出力する信号は、周波数誤差Δｆｅ１である第１の送信信号成分と、周波数誤差Δｆｅ２である第２の送信信号成分の混在信号となる。なお、Δｆｅ１及びΔｆｅ２は、
Δｆｅ１＝Δｆ１１−Δｆｈ１＝ｆｔ１−ｆｒ１−{（ｆｔ１＋ｆｔ２）／２−ｆｒ１}
＝（ｆｔ１−ｆｔ２）／２＝Δｆａ＝−Δｆｂ
Δｆｅ２＝Δｆ１２−Δｆｈ１＝ｆｔ２−ｆｒ１−{（ｆｔ１＋ｆｔ２）／２−ｆｒ１}
＝（ｆｔ２−ｆｔ１）／２＝Δｆｂ＝−Δｆａ
である。 The frequency error compensation circuit 38 performs frequency error compensation of the first intermediate signal using Δf h1 . Therefore, the signal output from the frequency error compensation circuit 38 is a mixed signal of the first transmission signal component having the frequency error Δf e1 and the second transmission signal component having the frequency error Δf e2 . Δf e1 and Δf e2 are
Δf e1 = Δf 11 −Δf h1 = f t1 −f r1 − {(f t1 + f t2 ) / 2−f r1 }
= (F t1 −f t2 ) / 2 = Δf a = −Δf b
Δf e2 = Δf 12 −Δf h1 = f t2 −f r1 − {(f t1 + f t2 ) / 2−f r1 }
= (F t2 −f t1 ) / 2 = Δf b = −Δf a
It is.

周波数誤差補償回路３９は、Δｆｈ２を用いて第２の中間信号の周波数誤差補償を行う。したがって、周波数誤差補償回路３９が出力する信号は、周波数誤差Δｆｅ３である第１の送信信号成分と、周波数誤差Δｆｅ４である第２の送信信号成分の混在信号となる。なお、Δｆｅ３及びΔｆｅ４は、
Δｆｅ３＝Δｆ２１−Δｆｈ２＝ｆｔ１−ｆｒ２−{（ｆｔ１＋ｆｔ２）／２−ｆｒ２}
＝（ｆｔ１−ｆｔ２）／２＝Δｆａ
Δｆｅ４＝Δｆ２２−Δｆｈ２＝ｆｔ２−ｆｒ２−{（ｆｔ１＋ｆｔ２）／２−ｆｒ２}
＝（ｆｔ２−ｆｔ１）／２＝Δｆｂ
である。 The frequency error compensation circuit 39 performs frequency error compensation of the second intermediate signal using Δf h2 . Therefore, the signal output from the frequency error compensation circuit 39 is a mixed signal of the first transmission signal component having the frequency error Δf e3 and the second transmission signal component having the frequency error Δf e4 . Δf e3 and Δf e4 are
Δf e3 = Δf 21 −Δf h2 = f t1 −f r2 − {(f t1 + f t2 ) / 2−f r2 }
= (F t1 -f t2 ) / 2 = Δf a
Δf e4 = Δf 22 −Δf h2 = f t2 −f r2 − {(f t1 + f t2 ) / 2−f r2 }
= (F t2 -f t1 ) / 2 = Δf b
It is.

周波数誤差補償回路３０は、Δｆ１１を用いて第１の中間信号の周波数誤差補償を行う。したがって、周波数誤差補償回路３０が出力する信号は、周波数誤差のない第１の送信信号成分と周波数誤差Δｆｅ５である第２の送信信号成分の混在信号となる。なお、Δｆｅ５は、
Δｆｅ５＝Δｆ１２−Δｆ１１＝ｆｔ２−ｆｒ１−（ｆｔ１−ｆｒ１）＝ｆｔ２−ｆｔ１
である。なお、周波数誤差検出回路２５が、周波数誤差補償回路３０にΔｆ１１を通知する構成であっても良い。 The frequency error compensation circuit 30 performs frequency error compensation of the first intermediate signal using Δf 11 . Therefore, the signal output from the frequency error compensation circuit 30 is a mixed signal of the first transmission signal component having no frequency error and the second transmission signal component having the frequency error Δf e5 . Δf e5 is
Δf e5 = Δf 12 -Δf 11 = f t2 -f r1 - (f t1 -f r1) = f t2 -f t1
It is. Note that the frequency error detection circuit 25 may notify Δf 11 to the frequency error compensation circuit 30.

周波数誤差補償回路３１は、Δｆ１２を用いて第１の中間信号の周波数誤差補償を行う。したがって、周波数誤差補償回路３１が出力する信号は、周波数誤差Δｆｅ６である第１の送信信号成分と周波数誤差のない第２の送信信号成分の混在信号となる。なお、Δｆｅ６は、
Δｆｅ６＝Δｆ１１−Δｆ１２＝ｆｔ１−ｆｒ１−（ｆｔ２−ｆｒ１）＝ｆｔ１−ｆｔ２
である。なお、周波数誤差検出回路２６が、周波数誤差補償回路３１にΔｆ１２を通知する構成であっても良い。 The frequency error compensation circuit 31 performs frequency error compensation of the first intermediate signal using Δf 12 . Therefore, the signal output from the frequency error compensation circuit 31 is a mixed signal of the first transmission signal component having the frequency error Δf e6 and the second transmission signal component having no frequency error. Δf e6 is
Δf e6 = Δf 11 -Δf 12 = f t1 -f r1 - (f t2 -f r1) = f t1 -f t2
It is. Note that the frequency error detection circuit 26 may notify the frequency error compensation circuit 31 of Δf 12 .

周波数誤差補償回路３２は、Δｆ２１を用いて第２の中間信号の周波数誤差補償を行う。したがって、周波数誤差補償回路３２が出力する信号は、周波数誤差のない第１の送信信号成分と周波数誤差Δｆｅ７である第２の送信信号成分の混在信号となる。なお、Δｆｅ７は、
Δｆｅ７＝Δｆ２２−Δｆ２１＝ｆｔ２−ｆｒ２−（ｆｔ１−ｆｒ２）＝ｆｔ２−ｆｔ１
である。なお、周波数誤差検出回路２７が、周波数誤差補償回路３２にΔｆ２１を通知する構成であっても良い。 The frequency error compensation circuit 32 performs frequency error compensation of the second intermediate signal using Δf 21 . Therefore, the signal output from the frequency error compensation circuit 32 is a mixed signal of the first transmission signal component having no frequency error and the second transmission signal component having the frequency error Δf e7 . Δf e7 is
Δf e7 = Δf 22 -Δf 21 = f t2 -f r2 - (f t1 -f r2) = f t2 -f t1
It is. Note that the frequency error detection circuit 27 may notify the frequency error compensation circuit 32 of Δf 21 .

周波数誤差補償回路３３は、Δｆ２２を用いて第２の中間信号の周波数誤差補償を行う。したがって、周波数誤差補償回路３３が出力する信号は、周波数誤差Δｆｅ８である第１の送信信号成分と周波数誤差のない第２の送信信号成分の混在信号となる。なお、Δｆｅ８は、
Δｆｅ８＝Δｆ２１−Δｆ２２＝ｆｔ１−ｆｒ２−（ｆｔ２−ｆｒ２）＝ｆｔ１−ｆｔ２
である。なお、周波数誤差検出回路２８が、周波数誤差補償回路３３にΔｆ２２を通知する構成であっても良い。 The frequency error compensation circuit 33 performs frequency error compensation of the second intermediate signal using Δf 22 . Therefore, the signal output from the frequency error compensation circuit 33 is a mixed signal of the first transmission signal component having the frequency error Δf e8 and the second transmission signal component having no frequency error. Δf e8 is
Δf e8 = Δf 21 -Δf 22 = f t1 -f r2 - (f t2 -f r2) = f t1 -f t2
It is. The frequency error detection circuit 28 may notify Δf 22 to the frequency error compensation circuit 33.

ＵＷマッチトフィルタ３４は、周波数誤差補償回路３０の出力信号のユニークワードのタイミングにおいて、周波数誤差補償回路３０の出力信号と第１のユニークワードの相関をとり、より具体的には畳み込み演算を行い、第１の中間信号における第１の送信信号の割合である伝搬路行列成分ｈ１１を干渉補償回路４０に出力し、ＵＷマッチトフィルタ３５は、周波数誤差補償回路３１の出力信号のユニークワードのタイミングにおいて、周波数誤差補償回路３１の出力信号と第２のユニークワードの畳み込み演算を行い、第１の中間信号における第２の送信信号の割合である伝搬路行列成分ｈ１２を干渉補償回路４０に出力し、ＵＷマッチトフィルタ３６は、周波数誤差補償回路３２の出力信号のユニークワードのタイミングにおいて、周波数誤差補償回路３２の出力信号と第１のユニークワードの畳み込み演算を行い、第２の中間信号における第１の送信信号の割合である伝搬路行列成分ｈ２１を干渉補償回路４０に出力し、ＵＷマッチトフィルタ３７は、周波数誤差補償回路３３の出力信号のユニークワードのタイミングにおいて、周波数誤差補償回路３３の出力信号と第２のユニークワードの畳み込み演算を行い、第２の中間信号における第２の送信信号の割合である伝搬路行列成分ｈ２２を干渉補償回路４０に出力する。 The UW matched filter 34 correlates the output signal of the frequency error compensation circuit 30 and the first unique word at the timing of the unique word of the output signal of the frequency error compensation circuit 30, and more specifically performs a convolution operation. , The propagation path matrix component h 11 that is the ratio of the first transmission signal in the first intermediate signal is output to the interference compensation circuit 40, and the UW matched filter 35 outputs the unique word of the output signal of the frequency error compensation circuit 31. in timing, it performs an output signal and convolving the second unique word frequency error compensation circuit 31, the channel matrix component h 12 is the ratio of the second transmission signal in the first intermediate signal to interference compensating circuit 40 The UW matched filter 36 outputs, at the timing of the unique word of the output signal of the frequency error compensation circuit 32, It performs convolution of the unique word output signal and the first wavenumber error compensation circuit 32, and outputs the first transmission signal is the ratio of the channel matrix component h 21 of the second intermediate signal to the interference compensation circuit 40, The UW matched filter 37 performs a convolution operation between the output signal of the frequency error compensation circuit 33 and the second unique word at the timing of the unique word of the output signal of the frequency error compensation circuit 33, and performs the second calculation on the second intermediate signal. The propagation path matrix component h 22 , which is the ratio of the transmitted signal, is output to the interference compensation circuit 40.

干渉補償回路４０は、伝搬路行列成分ｈ１１、ｈ１２、ｈ２１及びｈ２２を用いて、周波数誤差補償回路３８及び３９の出力信号から、それぞれ、第１の送信信号成分と第２の送信信号成分を分離合成することで、第１の送信信号に対応する第１の受信信号と、第２の送信信号に対応する第２の受信信号を得て、第１の受信信号を周波数誤差補償回路４１に、第２の受信信号を周波数誤差補償回路４２に出力する。 The interference compensation circuit 40 uses the propagation path matrix components h 11 , h 12 , h 21, and h 22 to output the first transmission signal component and the second transmission from the output signals of the frequency error compensation circuits 38 and 39, respectively. By separating and synthesizing the signal components, a first reception signal corresponding to the first transmission signal and a second reception signal corresponding to the second transmission signal are obtained, and frequency error compensation is performed on the first reception signal. The second reception signal is output to the circuit 41 to the frequency error compensation circuit 42.

上述した様に、周波数誤差補償回路３８及び３９が出力する信号に含まれる第１の送信信号成分は周波数誤差がΔｆａであるため、周波数誤差補償回路４１は、Δｆａだけ第１の受信信号の周波数誤差補償を行い復調回路４３に出力する。同様に、周波数誤差補償回路３８及び３９が出力する信号に含まれる第２の送信信号成分は周波数誤差がΔｆｂであるため、周波数誤差補償回路４２は、Δｆｂだけ第２の受信信号の周波数誤差補償を行い復調回路４４に出力する。 As described above, since the first transmission signal component contained in the signal frequency error compensation circuit 38 and 39 outputs the frequency error is Delta] f a, the frequency error compensation circuit 41, Delta] f a only first received signal Is output to the demodulation circuit 43. Similarly, since the frequency error of the second transmission signal component included in the signals output from the frequency error compensation circuits 38 and 39 is Δf b , the frequency error compensation circuit 42 has the frequency of the second received signal by Δf b . Error compensation is performed and output to the demodulation circuit 44.

以上、本発明による受信装置は、発振回路２３と２４が非同期であるにもかかわらず、周波数誤差の影響を受けずに伝搬路行列成分の推定を行い、かつ、復元した第１の送信信号及び第２の送信信号に残留する周波数誤差を除去する。よって、発振回路２３と２４を非同期としたことによる信号品質の劣化を抑えるという効果がある。   As described above, the receiving apparatus according to the present invention estimates the propagation path matrix component without being affected by the frequency error, and the restored first transmission signal and the oscillation circuit 23 and 24 are not affected by the frequency error. The frequency error remaining in the second transmission signal is removed. Therefore, there is an effect of suppressing deterioration in signal quality caused by making the oscillation circuits 23 and 24 asynchronous.

続いて、本発明の無線通信システムの他の実施形態について説明する。本実施形態における送信装置は、図１に示す構成と同じであり説明は省略する。図４は、本実施形態による受信装置のブロック図であり、図１と同じ機能であるブロックについては、同じ参照符号を使用して説明を省略する。図４によると、受信装置は、受信アンテナ１９及び２０と、周波数変換回路２１及び２２と、発振回路２３及び２４と、周波数誤差検出回路２５、２６、２７及び２８と、周波数誤差補償値制御回路４５と、周波数誤差補償回路４６、４７、４８、４９、５０、５１、４１及び４２と、ＵＷマッチトフィルタ３４、３５、３６及び３７と、干渉補償回路４０と、復調回路４３及び４４とを備えている。   Next, another embodiment of the wireless communication system of the present invention will be described. The transmission apparatus in the present embodiment has the same configuration as that shown in FIG. FIG. 4 is a block diagram of the receiving apparatus according to the present embodiment, and the blocks having the same functions as those in FIG. According to FIG. 4, the receiving apparatus includes receiving antennas 19 and 20, frequency conversion circuits 21 and 22, oscillation circuits 23 and 24, frequency error detection circuits 25, 26, 27, and 28, and a frequency error compensation value control circuit. 45, frequency error compensation circuits 46, 47, 48, 49, 50, 51, 41 and 42, UW matched filters 34, 35, 36 and 37, interference compensation circuit 40, and demodulation circuits 43 and 44. I have.

図１と同様、周波数誤差検出回路２５、２６、２７及び２８は、それぞれ、周波数誤差Δｆ１１、Δｆ１２、Δｆ２１及びΔｆ２２を周波数誤差補償値制御回路４５に出力し、図１の構成と同様、周波数誤差補償値制御回路４５は、Δｆ１１、Δｆ１２、Δｆ２１、Δｆ２２からΔｆｈ１、Δｆｈ２、Δｆａ、Δｆｂを算出し、Δｆｈ１を周波数誤差補償回路５０に、Δｆｈ２を周波数誤差補償回路５１に、Δｆａを周波数誤差補償回路４６、４８及び４１に、Δｆｂを周波数誤差補償回路４７、４９及び４２に出力する。 As in FIG. 1, the frequency error detection circuits 25, 26, 27, and 28 output the frequency errors Δf 11 , Δf 12 , Δf 21, and Δf 22 to the frequency error compensation value control circuit 45, respectively. Similarly, the frequency error compensation value control circuit 45 calculates Δf h1 , Δf h2 , Δf a , Δf b from Δf 11 , Δf 12 , Δf 21 , Δf 22 , and Δf h1 to the frequency error compensation circuit 50, and Δf h2 Are output to the frequency error compensation circuit 51, Δf a is output to the frequency error compensation circuits 46, 48 and 41, and Δf b is output to the frequency error compensation circuits 47, 49 and 42.

周波数誤差補償回路５０は、Δｆｈ１を用いて第１の中間信号の周波数誤差補償を行い、周波数誤差補償後の信号を、周波数誤差補償回路４６及び４７と、干渉補償回路４０に出力する。図１の実施形態にて説明した様に、周波数誤差補償回路５０が出力する信号は、周波数誤差Δｆｅ１＝Δｆａである第１の送信信号成分と、周波数誤差Δｆｅ２＝Δｆｂである第２の送信信号成分の混在信号となる。 The frequency error compensation circuit 50 performs frequency error compensation of the first intermediate signal using Δf h1, and outputs the frequency error compensated signal to the frequency error compensation circuits 46 and 47 and the interference compensation circuit 40. As described in the embodiment of FIG. 1, the signal output from the frequency error compensation circuit 50 is the first transmission signal component having the frequency error Δf e1 = Δf a and the first signal having the frequency error Δf e2 = Δf b . It becomes a mixed signal of two transmission signal components.

同様に、周波数誤差補償回路５１は、Δｆｈ２を用いて第２の中間信号の周波数誤差補償を行い、周波数誤差補償後の信号を、周波数誤差補償回路４８及び４９と、干渉補償回路４０に出力する。図１の実施形態にて説明した様に、周波数誤差補償回路５１が出力する信号は、周波数誤差Δｆｅ３＝Δｆａである第１の送信信号成分と、周波数誤差Δｆｅ４＝Δｆｂである第２の送信信号成分の混在信号となる。 Similarly, the frequency error compensation circuit 51 performs frequency error compensation of the second intermediate signal using Δf h2, and outputs the frequency error compensated signal to the frequency error compensation circuits 48 and 49 and the interference compensation circuit 40. To do. As described in Embodiment 1, the signal frequency error compensation circuit 51 is output is a first transmission signal component is a frequency error Δf e3 = Δf a, the frequency error Δf e4 = Δf b It becomes a mixed signal of two transmission signal components.

周波数誤差補償回路４６は、Δｆａを用いて周波数誤差補償回路５０による周波数補償後の第１の中間信号の周波数誤差補償を行う。したがって、周波数誤差補償回路４６が出力する信号は、周波数誤差のない第１の送信信号成分と、周波数誤差Δｆｅ５である第２の送信信号成分の混在信号となる。 Frequency error compensation circuit 46 performs the frequency error compensation of the first intermediate signal after frequency compensation by the frequency error compensation circuit 50 using a Delta] f a. Therefore, the signal output from the frequency error compensation circuit 46 is a mixed signal of the first transmission signal component having no frequency error and the second transmission signal component having the frequency error Δf e5 .

周波数誤差補償回路４７は、Δｆｂを用いて周波数誤差補償回路５０による周波数補償後の第１の中間信号の周波数誤差補償を行う。したがって、周波数誤差補償回路３１が出力する信号は、周波数誤差Δｆｅ６である第１の送信信号成分と、周波数誤差のない第２の送信信号成分の混在信号となる。 Frequency error compensation circuit 47 performs frequency error compensation of the first intermediate signal after frequency compensation by the frequency error compensation circuit 50 using a Delta] f b. Therefore, the signal output from the frequency error compensation circuit 31 is a mixed signal of the first transmission signal component having the frequency error Δf e6 and the second transmission signal component having no frequency error.

周波数誤差補償回路４８は、Δｆａを用いて周波数誤差補償回路５１による周波数補償後の第２の中間信号の周波数誤差補償を行う。したがって、周波数誤差補償回路４８が出力する信号は、周波数誤差のない第１の送信信号成分と、周波数誤差Δｆｅ７である第２の送信信号成分の混在信号となる。 Frequency error compensation circuit 48 performs the frequency error compensation of the second intermediate signal after frequency compensation by frequency error compensation circuit 51 using a Delta] f a. Therefore, the signal output from the frequency error compensation circuit 48 is a mixed signal of the first transmission signal component having no frequency error and the second transmission signal component having the frequency error Δf e7 .

周波数誤差補償回路４９は、Δｆｂを用いて周波数誤差補償回路５１による周波数補償後の第２の中間信号の周波数誤差補償を行う。したがって、周波数誤差補償回路４９が出力する信号は、周波数誤差Δｆｅ８である第１の送信信号成分と、周波数誤差のない第２の送信信号成分の混在信号となる。 Frequency error compensation circuit 49 performs frequency error compensation of the second intermediate signal after frequency compensation by frequency error compensation circuit 51 using a Delta] f b. Therefore, the signal output from the frequency error compensation circuit 49 is a mixed signal of the first transmission signal component having the frequency error Δf e8 and the second transmission signal component having no frequency error.

周波数誤差補償回路４６、４７、４８、４９、５０及び５１が出力する信号は、それぞれ、図１における周波数誤差補償回路３０、３１、３２、３３、３８及び３９と同じであり、よって、既に説明したのと同じ処理により第１の中間信号及び第２の中間信号から第１の送信信号に対応する第１の受信信号と、第２の送信信号に対応する第２の受信信号が生成されて復調される。   The signals output by the frequency error compensation circuits 46, 47, 48, 49, 50 and 51 are the same as the frequency error compensation circuits 30, 31, 32, 33, 38 and 39 in FIG. 1, respectively. From the first intermediate signal and the second intermediate signal, a first reception signal corresponding to the first transmission signal and a second reception signal corresponding to the second transmission signal are generated by the same processing as described above. Demodulated.

本発明による無線通信システムのブロック図である。1 is a block diagram of a wireless communication system according to the present invention. 第１の送信信号及び第２の送信信号のフレーム構成を示す図である。It is a figure which shows the frame structure of a 1st transmission signal and a 2nd transmission signal. 本発明による第１の中間信号及び第２の中間信号のフレーム構成を示す図である。It is a figure which shows the frame structure of the 1st intermediate signal and 2nd intermediate signal by this invention. 本実施形態による受信装置のブロック図である。It is a block diagram of the receiver by this embodiment. 従来技術による無線通信システムのブロック図である。1 is a block diagram of a wireless communication system according to the prior art. 従来技術による第１の中間信号及び第２の中間信号のフレーム構成を示す図である。It is a figure which shows the frame structure of the 1st intermediate signal and 2nd intermediate signal by a prior art.

符号の説明Explanation of symbols

１１、１２、７１、７２ 変調回路
１３、１４、２１、２２、７３、７４、８１、８２ 周波数変換回路
１５、１６、２３、２４、７５、７６、８３、８４ 発振回路
１７、１８、７７、７８ 送信アンテナ
１９、２０、７９、８０ 受信アンテナ
２５、２６、２７、２８、８５、８６ 周波数誤差検出回路
２９、４５ 周波数誤差補償値制御回路
３０、３１、３２、３３、３８、３９、４１、４２、４６ 周波数誤差補償回路
４７、４８、４９、５０、５１、８７、８８、８９、９０ 周波数誤差補償回路
３４、３５、３６、３７、９１、９２、９３、９４ ユニークワードマッチトフィルタ
４０、９５ 干渉補償回路
４３、４４、９６、９７ 復調回路 11, 12, 71, 72 Modulation circuit 13, 14, 21, 22, 73, 74, 81, 82 Frequency conversion circuit 15, 16, 23, 24, 75, 76, 83, 84 Oscillation circuit 17, 18, 77, 78 Transmitting antenna 19, 20, 79, 80 Receiving antenna 25, 26, 27, 28, 85, 86 Frequency error detection circuit 29, 45 Frequency error compensation value control circuit 30, 31, 32, 33, 38, 39, 41, 42, 46 Frequency error compensation circuit 47, 48, 49, 50, 51, 87, 88, 89, 90 Frequency error compensation circuit 34, 35, 36, 37, 91, 92, 93, 94 Unique word matched filter 40, 95 Interference compensation circuit 43, 44, 96, 97 Demodulation circuit

Claims (7)

空間多重された第１の送信信号及び第２の送信信号を受信する受信装置であって、
第１の受信アンテナと、
第２の受信アンテナと、
第１の受信アンテナが受信する信号を周波数変換し、第１の中間信号を出力する第１の受信周波数変換手段と、
第２の受信アンテナが受信する信号を、第１の受信周波数変換手段とは異なる発振手段を用いて周波数変換し、第２の中間信号を出力する第２の受信周波数変換手段と、
第１の中間信号の周波数補償を行う第１の周波数誤差補償手段と、
第２の中間信号の周波数補償を行う第２の周波数誤差補償手段と、
第１の中間信号及び第２の中間信号の周波数補償を行って伝搬路行列を算出する手段と、
伝搬路行列に基づき第１の周波数誤差補償手段の出力信号と、第２の周波数誤差補償手段の出力信号から第１の送信信号に対応する第１の受信信号と、第２の送信信号に対応する第２の受信信号を生成する干渉補償手段と、
を備えている受信装置。 A receiving apparatus that receives a first transmission signal and a second transmission signal that are spatially multiplexed,
A first receiving antenna;
A second receiving antenna;
First receiving frequency converting means for converting the frequency of a signal received by the first receiving antenna and outputting a first intermediate signal;
A second reception frequency converting means for frequency-converting a signal received by the second receiving antenna using an oscillating means different from the first receiving frequency converting means, and outputting a second intermediate signal;
First frequency error compensation means for performing frequency compensation of the first intermediate signal;
Second frequency error compensation means for performing frequency compensation of the second intermediate signal;
Means for calculating a channel matrix by performing frequency compensation of the first intermediate signal and the second intermediate signal;
Corresponding to the output signal of the first frequency error compensation means based on the propagation path matrix, the first reception signal corresponding to the first transmission signal from the output signal of the second frequency error compensation means, and the second transmission signal Interference compensation means for generating a second received signal,
A receiving device. 第１の中間信号に含まれる第１の送信信号成分が受けた第１の周波数誤差、第１の中間信号に含まれる第２の送信信号成分が受けた第２の周波数誤差、第２の中間信号に含まれる第１の送信信号成分が受けた第３の周波数誤差、及び、第２の中間信号に含まれる第２の送信信号成分が受けた第４の周波数誤差を検出する周波数誤差検出手段を、更に、備えており、
第１の周波数誤差補償手段は、第１の周波数誤差と第２の周波数誤差の和に基づき第１の中間信号の周波数補償を行い、
第２の周波数誤差補償手段は、第３の周波数誤差と第４の周波数誤差の和に基づき第２の中間信号の周波数補償を行う、
請求項１に記載の受信装置。 The first frequency error received by the first transmission signal component included in the first intermediate signal, the second frequency error received by the second transmission signal component included in the first intermediate signal, and the second intermediate Frequency error detection means for detecting a third frequency error received by the first transmission signal component included in the signal and a fourth frequency error received by the second transmission signal component included in the second intermediate signal In addition,
The first frequency error compensation means performs frequency compensation of the first intermediate signal based on the sum of the first frequency error and the second frequency error,
The second frequency error compensation means performs frequency compensation of the second intermediate signal based on the sum of the third frequency error and the fourth frequency error.
The receiving device according to claim 1. 伝搬路行列を算出する手段は、
第１の周波数誤差に基づき第１の中間信号の周波数補償を行う第３の周波数誤差補償手段と、
第２の周波数誤差に基づき第１の中間信号の周波数補償を行う第４の周波数誤差補償手段と、
第３の周波数誤差に基づき第２の中間信号の周波数補償を行う第５の周波数誤差補償手段と、
第４の周波数誤差に基づき第２の中間信号の周波数補償を行う第６の周波数誤差補償手段と、
第３、第４、第５及び第６の周波数誤差補償手段の出力信号から伝搬路行列成分を出力する手段と、
を備えている請求項２に記載の受信装置。 The means for calculating the propagation path matrix is:
Third frequency error compensation means for performing frequency compensation of the first intermediate signal based on the first frequency error;
Fourth frequency error compensation means for performing frequency compensation of the first intermediate signal based on the second frequency error;
Fifth frequency error compensation means for performing frequency compensation of the second intermediate signal based on the third frequency error;
Sixth frequency error compensation means for performing frequency compensation of the second intermediate signal based on the fourth frequency error;
Means for outputting a propagation path matrix component from the output signals of the third, fourth, fifth and sixth frequency error compensating means;
The receiving device according to claim 2. 第１の送信信号は、第１の特定パターンを含み、
第２の送信信号は、第２の特定パターンを含み、
伝搬路行例は、
第３の周波数誤差補償手段の出力信号と第１の特定パターンとの相関と、
第４の周波数誤差補償手段の出力信号と第２の特定パターンとの相関と、
第５の周波数誤差補償手段の出力信号と第１の特定パターンとの相関と、
第６の周波数誤差補償手段の出力信号と第２の特定パターンとの相関と、
により算出する、
請求項３に記載の受信装置。 The first transmission signal includes a first specific pattern,
The second transmission signal includes a second specific pattern,
An example of propagation path is
A correlation between the output signal of the third frequency error compensation means and the first specific pattern;
A correlation between the output signal of the fourth frequency error compensation means and the second specific pattern;
A correlation between the output signal of the fifth frequency error compensation means and the first specific pattern;
A correlation between the output signal of the sixth frequency error compensating means and the second specific pattern;
Calculated by
The receiving device according to claim 3 . 第５の周波数誤差に基づき、第１の受信信号の周波数補償を行う第７の周波数誤差補償手段と、
第５の周波数誤差とは絶対値が同一で、その符号が反転する第６の周波数誤差に基づき、第２の受信信号の周波数補償を行う第８の周波数誤差補償手段と、
を備えており、
第５の周波数誤差は、第１の周波数誤差と第２の周波数誤差の差、又は、第３の周波数誤差と第４の周波数誤差の差に基づき算出される、
請求項２から４のいずれか１項に記載の受信装置。 Seventh frequency error compensation means for performing frequency compensation of the first received signal based on the fifth frequency error;
An eighth frequency error compensating means for performing frequency compensation of the second received signal based on a sixth frequency error having the same absolute value as that of the fifth frequency error and whose sign is inverted;
With
The fifth frequency error is calculated based on the difference between the first frequency error and the second frequency error, or the difference between the third frequency error and the fourth frequency error.
The receiving device according to any one of claims 2 to 4 . 第１の送信信号及び第２の送信信号は、それぞれ、無信号である区間を含み、
第１の周波数誤差は、第１の送信信号が無信号ではなく、かつ、第２の送信信号が無信号である区間における第１の中間信号から検出し、
第２の周波数誤差は、第１の送信信号が無信号であり、かつ、第２の送信信号が無信号でない区間における第１の中間信号から検出し、
第３の周波数誤差は、第１の送信信号が無信号ではなく、かつ、第２の送信信号が無信号である区間における第２の中間信号から検出し、
第４の周波数誤差は、第１の送信信号が無信号であり、かつ、第２の送信信号が無信号でない区間における第２の中間信号から検出する、
請求項２から５のいずれか１項に記載の受信装置。 Each of the first transmission signal and the second transmission signal includes a section where there is no signal,
The first frequency error is detected from the first intermediate signal in a section where the first transmission signal is not a no-signal and the second transmission signal is a no-signal,
The second frequency error is detected from the first intermediate signal in a section where the first transmission signal is no signal and the second transmission signal is not a signal,
The third frequency error is detected from the second intermediate signal in a section where the first transmission signal is not a no-signal and the second transmission signal is a no-signal,
The fourth frequency error is detected from a second intermediate signal in a section where the first transmission signal is no signal and the second transmission signal is not a signal.
The receiving device according to any one of claims 2 to 5 . 請求項１から６のいずれか１項に記載の受信装置と、送信装置とを有する無線通信システムであって、
送信装置は、
第１の送信信号を周波数変換する第１の送信周波数変換手段と、
第２の送信信号を、第１の送信周波数変換手段とは異なる発振手段を用いて周波数変換する第２の送信周波数変換手段と、
を備えている無線通信システム。 A wireless communication system comprising the receiving device according to any one of claims 1 to 6 and a transmitting device,
The transmitter is
First transmission frequency converting means for converting the frequency of the first transmission signal;
Second transmission frequency conversion means for converting the frequency of the second transmission signal using oscillation means different from the first transmission frequency conversion means;
A wireless communication system comprising:
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