JP2010252392A - 受信装置および通信方法 - Google Patents
受信装置および通信方法 Download PDFInfo
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- 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
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- 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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- 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
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- 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
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
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- 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
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0019—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
-
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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- 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
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- 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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
- H04L5/0046—Determination of how many bits are transmitted on different sub-channels
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- 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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
Abstract
【解決手段】伝送路特性取得部107が、受信RF部106から入力される受信信号から無線受信装置200で推定されたブロック毎のSNRの平均とSNRの分散を取得して割当部108に出力し、割当部108が、伝送路特性取得部107から入力されるブロック毎のSNRの平均とSNRの分散に基づいて、ブロック毎に変調方式を選択し、変調部101−1〜101−Lは、割当部108で選択されたブロック毎に異なる変調方式で各ブロックに含まれるマルチキャリア信号に対して変調を行う。
【選択図】図1
Description
本実施の形態では、各ブロック内の伝送路特性の変動を示す値としてSNRの分散を用いる場合について説明する。
割当部108は、伝送路特性取得部107から入力された伝送路特性情報、すなわちSNRm(平均SNR)およびSNRv(SNR分散)に基づいて、最も伝送効率がよい変調方式を選択する。ある所定のPER(例えばPER=10-1)における、SNRm(平均SNR)およびSNRv(SNR分散)と変調方式との対応関係を図4に示す。図4では、SNR分散の逆関数と平均SNRとで2次元座標区間を予め5つの領域に区切ってあり、それぞれの領域に異なる変調方式(「送信しない」を含む)が割り当ててある。そして、推定した伝送路特性を座標(SNRm,1/SNRv)で示し、その座標が位置する領域に対応する変調方式および符号化率を選択する。
重み付け(dB値の重み付け)SNRとして、以下の4種類を定義する。
(1)SNRw1=SNRm−sqrt(SNRv)*w
(2)SNRw2=SNRm−sqrt(SNRv)
*w(|SNRmmax−SNRm|/|SNRmmax|)
(3)SNRw3=SNRm−sqrt(SNRv)*w(fd/fdmax)
(4)SNRw4=SNRm−sqrt(SNRv)*w(δ/δmax)
本実施の形態では、各ブロック内の伝送路特性の変動を示す値としてチャネル推定値の分散を用いる場合について説明する。
(1)SNRw1=SNRm−Hv*w
(2)SNRw2=SNRm−Hv
*w(|Hvmax−Hv|/|Hvmax|)
(3)SNRw3=SNRm−Hv*w(fd/fdmax)
(4)SNRw4=SNRm−Hv*w(δ/δmax)
本実施の形態では、各ブロック内の伝送路特性の変動を示す値としてパイロット部分の信号の振幅値の分散(パイロット分散)を用いる場合について説明する。
サブキャリアのブロック化が行われる通信システムに適応変調が適用される場合において、各ブロックの通信品質の低下を招くのは、各ブロックのサブキャリアのうち主に平均SNR以下の瞬時SNRとなるサブキャリアである。そこで、本実施の形態では、上記実施の形態1〜3において、平均SNR以下の瞬時SNRだけを用いて分散を求めるようにする。
Claims (4)
- 回線品質に関する情報を受信する受信装置であって、
周波数方向に配置された複数のサブキャリアを対象として算出された、回線品質の周波数方向の変動に関する情報と、前記複数のサブキャリアを対象として算出された、前記回線品質の周波数方向の平均に関する情報とを受信する受信部と、
前記回線品質の周波数方向の変動に関する情報と、前記回線品質の周波数方向の平均に関する情報とを用いて送信を制御する送信制御部と、
を有する受信装置。 - 前記回線品質とはパイロット信号の通信品質である、
請求項1記載の受信装置。 - 周波数方向に配置された複数のサブキャリアを対象として算出された、回線品質の周波数方向の変動に関する情報と、前記複数のサブキャリアを対象として算出された、前記回線品質の周波数方向の平均に関する情報とを受信し、
前記回線品質の周波数方向の変動に関する情報と、前記回線品質の周波数方向の平均に関する情報とを用いて送信を制御する、
通信方法。 - 回線品質に関する情報を受信する受信装置であって、
回線品質の変動に関する情報と、前記回線品質の平均に関する情報とを受信する受信部と、
前記回線品質の変動に関する情報と、前記回線品質の平均に関する情報とを用いて送信を制御する送信制御部と、
を有する受信装置。
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US (4) | US7308052B2 (ja) |
EP (2) | EP3136637A1 (ja) |
JP (3) | JP4495676B2 (ja) |
KR (5) | KR101055004B1 (ja) |
CN (2) | CN102739365B (ja) |
BR (1) | BRPI0413187A8 (ja) |
WO (1) | WO2005013525A1 (ja) |
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