JP4495676B2 - 送信装置および送信方法 - Google Patents
送信装置および送信方法 Download PDFInfo
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- JP4495676B2 JP4495676B2 JP2005512592A JP2005512592A JP4495676B2 JP 4495676 B2 JP4495676 B2 JP 4495676B2 JP 2005512592 A JP2005512592 A JP 2005512592A JP 2005512592 A JP2005512592 A JP 2005512592A JP 4495676 B2 JP4495676 B2 JP 4495676B2
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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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- Probability & Statistics with Applications (AREA)
- Electromagnetism (AREA)
- Mobile Radio Communication Systems (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Description
松岡、上、三瓶、森永:「シンボルレート・変調多値数可変適応変調方式の伝送特性解析」,信学技報 TECHNICAL REPORT OF IEICE. RCS94-64 (1994-09), pp.31-36
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 (3)
- 受信品質に関する情報を送信する送信装置であって、
周波数方向に配置された複数のサブキャリアに含まれる信号の受信品質を測定する測定部と、
前記複数のサブキャリアを対象として前記受信品質の周波数方向の分散に関する情報を算出する算出部と、
前記周波数方向の分散に関する情報を送信する送信部と、を有し、
前記算出部はさらに前記複数のサブキャリアを対象として前記受信品質の周波数方向の平均に関する情報を算出し、
前記送信部はさらに前記周波数方向の平均に関する情報を送信する、
送信装置。 - 前記測定部は前記複数のサブキャリアに含まれるパイロット信号の受信品質を測定し、
前記算出部は前記パイロット信号の周波数方向の分散に関する情報を算出する、
請求項1記載の送信装置。 - 受信品質に関する情報を送信する送信方法であって、
周波数方向に配置された複数のサブキャリアに含まれる信号の受信品質を測定し、
前記複数のサブキャリアを対象として前記受信品質の周波数方向の分散に関する情報と前記受信品質の周波数方向の平均に関する情報とを算出し、
前記分散に関する情報と前記平均に関する情報とを送信する、
送信方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003284509 | 2003-07-31 | ||
JP2003284509 | 2003-07-31 | ||
PCT/JP2004/011299 WO2005013525A1 (ja) | 2003-07-31 | 2004-07-30 | 無線送信装置および変調方式選択方法 |
Related Child Applications (1)
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JP2009235116A Division JP4719293B2 (ja) | 2003-07-31 | 2009-10-09 | 送信装置および送信方法 |
Publications (2)
Publication Number | Publication Date |
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JPWO2005013525A1 JPWO2005013525A1 (ja) | 2006-09-28 |
JP4495676B2 true JP4495676B2 (ja) | 2010-07-07 |
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ID=34113842
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
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JP2005512592A Expired - Fee Related JP4495676B2 (ja) | 2003-07-31 | 2004-07-30 | 送信装置および送信方法 |
JP2009235116A Expired - Fee Related JP4719293B2 (ja) | 2003-07-31 | 2009-10-09 | 送信装置および送信方法 |
JP2010156826A Expired - Fee Related JP4872010B2 (ja) | 2003-07-31 | 2010-07-09 | 受信装置および通信方法 |
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JP2009235116A Expired - Fee Related JP4719293B2 (ja) | 2003-07-31 | 2009-10-09 | 送信装置および送信方法 |
JP2010156826A Expired - Fee Related JP4872010B2 (ja) | 2003-07-31 | 2010-07-09 | 受信装置および通信方法 |
Country Status (7)
Country | Link |
---|---|
US (4) | US7308052B2 (ja) |
EP (2) | EP3136637A1 (ja) |
JP (3) | JP4495676B2 (ja) |
KR (5) | KR101161382B1 (ja) |
CN (2) | CN1826745B (ja) |
BR (1) | BRPI0413187A8 (ja) |
WO (1) | WO2005013525A1 (ja) |
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