JP5182679B2 - 受信信号を調節する方法および装置 - Google Patents
受信信号を調節する方法および装置 Download PDFInfo
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- JP5182679B2 JP5182679B2 JP2011034593A JP2011034593A JP5182679B2 JP 5182679 B2 JP5182679 B2 JP 5182679B2 JP 2011034593 A JP2011034593 A JP 2011034593A JP 2011034593 A JP2011034593 A JP 2011034593A JP 5182679 B2 JP5182679 B2 JP 5182679B2
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- Prior art keywords
- evm
- deviation value
- wireless communication
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- transmitter
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
-
- 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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03891—Spatial equalizers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
-
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
-
- 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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
- H04L2025/03426—Arrangements for removing intersymbol interference characterised by the type of transmission transmission using multiple-input and multiple-output channels
-
- 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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03343—Arrangements at the transmitter end
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
- H04W52/226—TPC being performed according to specific parameters taking into account previous information or commands using past references to control power, e.g. look-up-table
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Quality & Reliability (AREA)
- Power Engineering (AREA)
- Radio Transmission System (AREA)
- Noise Elimination (AREA)
- Transmitters (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Description
これは、
に等しい。
として記述される。RnはMLレシーバにおける合成ノイズ共分散マトリックス(例えばトランスミッタのガウスノイズ)である。つまり、
本式中、
は、レシーバチェーンの各々におけるレシーバで計測されたノイズ分散であり、
は、トランスミッタアンテナポートで計測されたトランスミッタノイズ分散である。Hは、MLレシーバでパケットプリアンブル分析中に推定されるが、
および
は、MLレシーバでは未知であり、MLレシーバの性能を損なう可能性がある。従って上述した問題を軽減させる必要がある。
例えば、ノイズはホワイトノイズであってよく、ノイズ共分散マトリックスは
であってよい。従って、ML検索式にノイズを追加すると、以下の数式が得られるが、本発明の範囲はこの点に限定はされない。
Claims (20)
- MIMO(multiple-input-multiple-output)トランスミッタのノイズレベル値を当該MIMOトランスミッタにおいて計測する段階と、
前記MIMOトランスミッタにおいて、計測された前記ノイズレベル値に基づきエラーベクトル振幅(EVM)偏差値を定める段階と、
前記EVM偏差値を含むフィールドを有するフレームを、前記MIMOトランスミッタからMIMOレシーバへ送信する段階と
を備える方法。 - 前記EVM偏差値を定める段階は、
計測された前記ノイズレベル値から推定されたEVMを推定する段階と、
予め格納されているEVM値と前記推定されたEVMとに基づいて前記EVM偏差値を計算する段階と、
を備える請求項1に記載の方法。 - 請求項1または2に記載の各段階を実行するMIMOトランスミッタを備えた、無線通信デバイス。
- MIMO(multiple-input-multiple-output)レシーバシステムの受信信号を調節する方法であって、
受信データストリームとともにエラーベクトル振幅(EVM)偏差値を受信する段階と、
最大尤度検出スキームを利用して、前記受信データストリームからシンボルを検出する段階と、
前記EVM偏差値を予め格納されているEVM値に追加する段階と、
前記シンボルを所望の配置点の上に配置する段階と
を備える方法。 - 前記受信する段階は、
前記EVM偏差値を含むフレームを受信する段階を有する請求項4に記載の方法。 - 変調符号化スキームを受信して、前記変調符号化スキームに従って前記EVM偏差値を前記予め格納されているEVM値に追加する段階を備える請求項4に記載の方法。
- 前記シンボルを所望の配置点の上に配置するべく前記EVM偏差値を予め格納されているEVM値に追加することで、トランスミッタノイズについて前記受信信号を調節する段階を備える請求項4に記載の方法。
- 受信データストリームとともにエラーベクトル振幅(EVM)偏差値を受信するMIMOレシーバシステムと、
最大尤度検出スキームを利用して前記受信データストリームからシンボルを検出して、前記EVM偏差値を予め格納されているEVM値に追加して、前記シンボルを所望の配置点の上に配置する検出器と
を備える無線通信デバイス。 - 前記MIMOレシーバシステムは、前記EVM偏差値を含むフレームを受信する請求項8に記載の無線通信デバイス。
- 前記フレームは変調符号化スキームを含み、
前記検出器は、前記変調符号化スキームに従って前記EVM偏差値を前記予め格納されているEVM値に追加する請求項9に記載の無線通信デバイス。 - 予め格納される前記EVM値をテーブルに格納するメモリを備え、
前記検出器は、前記シンボルを所望の配置点の上に配置するべく前記EVM偏差値を前記テーブルに予め格納されている前記EVM値に追加することで、トランスミッタノイズについて受信信号を調節する請求項8に記載の無線通信デバイス。 - 前記検出器は最大尤度検出器を有する請求項8に記載の無線通信デバイス。
- 前記トランスミッタノイズはホワイトノイズを含む請求項11に記載の無線通信デバイス。
- MIMOレシーバシステムに動作可能に連結され、受信データストリームとともにエラーベクトル振幅(EVM)偏差値を受信するアンテナアレイと、
最大尤度検出スキームを利用して前記受信データストリームからシンボルを検出して、前記シンボルを所望の配置点の上に配置するべく前記EVM偏差値を予め格納されているEVM値に追加する検出器と
を備える無線通信システム。 - 前記MIMOレシーバは、前記EVM偏差値を含むフレームを受信する請求項14に記載の無線通信システム。
- 前記フレームは変調符号化スキームを含み、
前記検出器は、前記変調符号化スキームに従って前記EVM偏差値を予め格納されているEVM値に追加する請求項15に記載の無線通信システム。 - 予め格納される前記EVM値をテーブルに格納するメモリを備え、
前記検出器は、前記シンボルを所望の配置点の上に配置するべく前記EVM偏差値を前記テーブルに予め格納されている前記EVM値に追加することで、トランスミッタノイズについて受信信号を調節する請求項14に記載の無線通信システム。 - 前記検出器は最大尤度検出器を有する請求項14に記載の無線通信システム。
- 前記トランスミッタノイズはホワイトノイズを含む請求項17に記載の無線通信システム。
- OFDM(Orthogonal Frequency-Division Multiplexing)スキームを利用してWLAN(wireless local area network)内で動作する請求項14に記載の無線通信システム。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/732,459 US8711760B2 (en) | 2010-03-26 | 2010-03-26 | Method and apparatus to adjust received signal |
US12/732,459 | 2010-03-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2011229124A JP2011229124A (ja) | 2011-11-10 |
JP5182679B2 true JP5182679B2 (ja) | 2013-04-17 |
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JP2011034593A Expired - Fee Related JP5182679B2 (ja) | 2010-03-26 | 2011-02-21 | 受信信号を調節する方法および装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US8711760B2 (ja) |
EP (1) | EP2553833B1 (ja) |
JP (1) | JP5182679B2 (ja) |
CN (1) | CN102201850A (ja) |
WO (1) | WO2011120031A2 (ja) |
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US20110235622A1 (en) | 2011-09-29 |
JP2011229124A (ja) | 2011-11-10 |
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WO2011120031A3 (en) | 2012-02-23 |
EP2553833B1 (en) | 2018-07-18 |
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US8711760B2 (en) | 2014-04-29 |
CN102201850A (zh) | 2011-09-28 |
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