JP4599192B2 - 無線データ通信システム、および、無線データ通信方法 - Google Patents
無線データ通信システム、および、無線データ通信方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0678—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission using different spreading codes between antennas
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
- H04L27/364—Arrangements for overcoming imperfections in the modulator, e.g. quadrature error or unbalanced I and Q levels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
- H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
- H04L27/3863—Compensation for quadrature error in the received signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0226—Channel estimation using sounding signals sounding signals per se
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Radio Transmission System (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Description
図1は、一般的なMIMO方式の原理を説明する図である。
以下では、図2および図3を用いてIQミスマッチについて説明する。
図2は、図1に示した従来技術に係るMIMO送信機、受信機の内部にある直交変調機と直交復調機を明示的に示したものである。
図3は、四位相偏移変調(QPSK:Quadrature Phase Shift Keying)のコンスタレーション(constellation:I(同相成分)およびQ(直交成分)をそれぞれ互いに直交する2つの座標軸(図3の例では横軸がI軸、縦軸がQ軸)で表現した場合に、その2つの座標軸によって形成される座標平面)におけるIQミスマッチによる伝送信号の歪みを示す図である。
図4は、本発明の第一の実施例に係るデータ通信システムの構成と伝搬路を表現する行列を示す図である。
図5は、図4の送信側のみを示した図である。
図6は、図4の受信側のみを示した図である。
図7は、従来技術に係る通信方法と本発明に係る通信方法のSNR対BER特性の比較を示したグラフである。
図8は、二つの線形独立な信号点を有するトレーニング信号のコンスタレーションの例を示す図である。
図9は、QPSKにおけるトレーニング信号のコンスタレーションの例を示す図である。
図10および図11は、二位相偏移変調(BPSK:Binary Phase Shift Keying)におけるトレーニング信号とデータの配置関係とコンスタレーションの与え方を示す図である。
102…送信アンテナ
103…受信アンテナ
104…MIMO受信機
105…直交変調機
106…直交復調機
107…MIMO変調機
108…MIMO復調機
109…コンスタレーション上の信号点
Claims (6)
- M本の送信アンテナを有する送信機とN本の受信アンテナを有する受信機の間でデータ通信をおこなう無線データ通信システムであって、
前記送信機は、各々の送信アンテナに対する送信信号を変調する変調機を具備してなり、
前記受信機は、各々の受信アンテナからの受信信号を復調する復調機を具備してなり、
前記送信機から前記受信機に、線形従属の関係にある少なくとも二つの信号点の組み合わせを含む第一のトレーニング信号と、前記第一のトレーニング信号と線形独立となり、線形従属関係にある少なくとも二つの信号点の組み合わせを含む第二のトレーニング信号を前記M本の送信アンテナからそれぞれ送信し、
M個の送信信号ベクトルの同相成分と直交成分と、N個の受信ベクトルの同相成分と直交成分とから、変調時に生ずる前記変調機の同相成分のずれと直交成分のずれと、復調時に生じる前記復調機の同相成分のずれと直交成分のずれとを含んだ送信信号ベクトルと受信信号ベクトルとの関係を表す2N行2M列の伝搬路行列を演算し、
前記第一のトレーニング信号あるいは前記第二のトレーニング信号の少なくともいずれかの送信後に、前記送信機から前記受信機に送信されるデータによって、前記復調機に入力される同相成分と直交成分とを、前記伝搬路行列に基づいて演算することを特徴とする無線データ通信システム。 - 請求項1において、
前記第一のトレーニング信号と前記第二のトレーニング信号から各々信号点を抽出し、前記抽出した信号点のコンスタレーション上の位相が互いに90°異なるBPSKにより構成することを特徴とする無線データ通信システム。 - 請求項1において、
前記第一のトレーニング信号及び前記第二のトレーニング信号をBPSKによりそれぞれ構成し、前記第一のトレーニング信号及び前記第二のトレーニング信号を送出するたびに前記トレーニング信号のコンスタレーション上の信号点の位相を90°回転させることを特徴とする無線データ通信システム。 - M本の送信アンテナを有する送信機とN本の受信アンテナを有する受信機の間でデータ通信をおこなう無線データ通信方法であって、
前記送信機は、各々の送信アンテナに対する送信信号を変調してデータを前記送信アンテナから送信する送信機であり、
前記受信機は、各々の受信アンテナからの受信信号を復調してデータを取り出す受信機であり、
前記送信機から前記受信機に、線形従属の関係にある少なくとも二つの信号点の組み合わせを含む第一のトレーニング信号と、前記第一のトレーニング信号と線形独立な信号で、線形従属関係にある少なくとも二つの信号点の組み合わせを含む第二のトレーニング信号とを、前記M本の送信アンテナからそれぞれ送信するステップと、
M個の送信信号ベクトルの同相成分と直交成分と、N個の受信ベクトルの同相成分と直交成分とから、変調時に生ずる前記変調機の同相成分のずれと直交成分のずれと、復調時に生じる前記復調機の同相成分のずれと直交成分のずれとを含んだ送信信号ベクトルと受信信号ベクトルとの関係を表す2N行2M列の伝搬路行列を演算するステップと、
前記第一のトレーニング信号あるいは前記第二のトレーニング信号の少なくともいずれかの送信後に、前記送信機から前記受信機に前記送信アンテナから前記受信アンテナにデータを送信するステップと、
送信されたデータよって前記復調機に入力される同相成分と直交成分とを、前記伝搬路行列に基づいて演算するステップと
を有することを特徴とする無線データ通信方法。 - 請求項4において、
第一のトレーニング信号と第二のトレーニング信号から各々信号点を抽出し、前記抽出した信号点のコンスタレーション上の位相が互いに90°異なるBPSKにより構成することを特徴とする無線データ通信方法。 - 請求項4において、
前記第一のトレーニング信号及び前記第二のトレーニング信号をBPSKによりそれぞれ構成し、前記第一のトレーニング信号及び前記第二のトレーニング信号を送出するたびに前記トレーニング信号のコンスタレーション上の信号点の位相を90°回転させることを特徴とする無線データ通信方法。
Priority Applications (4)
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JP2005057206A JP4599192B2 (ja) | 2005-03-02 | 2005-03-02 | 無線データ通信システム、および、無線データ通信方法 |
KR1020050075181A KR20060096246A (ko) | 2005-03-02 | 2005-08-17 | 무선 데이터 통신시스템 및 무선 데이터 통신방법 |
CN2005100965369A CN1829137B (zh) | 2005-03-02 | 2005-08-26 | 无线数据通信系统及无线数据通信方法 |
US11/211,616 US8345785B2 (en) | 2005-03-02 | 2005-08-26 | Wireless data communication system and wireless data communication method |
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JP2006245871A5 JP2006245871A5 (ja) | 2007-08-23 |
JP4599192B2 true JP4599192B2 (ja) | 2010-12-15 |
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JP2001285251A (ja) * | 2000-04-03 | 2001-10-12 | Victor Co Of Japan Ltd | 伝送信号の生成方法、及び伝送信号の生成装置 |
JP2002252663A (ja) * | 2001-02-26 | 2002-09-06 | Fujitsu General Ltd | ディジタル無線装置 |
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CN1829137B (zh) | 2011-11-09 |
US8345785B2 (en) | 2013-01-01 |
KR20060096246A (ko) | 2006-09-11 |
CN1829137A (zh) | 2006-09-06 |
US20060198461A1 (en) | 2006-09-07 |
JP2006245871A (ja) | 2006-09-14 |
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