Interference cancellation with diagonalized maximum likelihood decoder for space-time/space-frequency block coded OFDM

Hiroshi Kanemaru, Tomoaki Ohtsuki

研究成果: Conference contribution

13 引用 (Scopus)

抄録

Recently, Space-Time Block Coded OFDM (ST-OFDM) that applies Space-Time Block Code (STBC) to OFDM has been proposed. Space-Frequency Block Coded OFDM (SF-OFDM) has been also proposed where the block codes are formed over the space and frequency domain. ST-OFDM and SF-OFDM are known as the schemes that achieve good performance over the multipath fading environments and the fast fading environments, respectively. For the systems with two transmit antennas, the orthogonal conditions required to separate the received signals are that in ST-OFDM, the frequency responses of the consecutive two OFDM symbols are almost identical and that in SF-OFDM, the frequency responses of the adjacent two subcarriers are almost identical. In practical fading environments, however, these conditions of the orthogonality sometimes cannot be satisfied. In those environments, the received signals cannot be well separated and the performances are degraded. Recently, the diagonalized maximum likelihood decoder (DMLD) of new zero-forcing (ZF) type was proposed for the space-time block coded single carrier QPSK system to maintain the orthogonality of STBC under the fast fading environments and the flat fading environments, where the channel separation in DMLD is performed by the ZF algorithm using two receive signals at time index 2n, 2n + 1 (STC) or two subcarriers (SFC). Note that the matrix generated after the channel separation is not an identity matrix but the matrix proportional to an identity matrix. We show that ST/SF-OFDM with DMLD outperform ST/SF-OFDM in terms of Bit Error Rate (BER).

元の言語English
ホスト出版物のタイトルIEEE Vehicular Technology Conference
ページ525-529
ページ数5
59
エディション1
出版物ステータスPublished - 2004
外部発表Yes
イベント2004 IEEE 59th Vehicular Technology Conference, VTC2004-Spring: Towards a Global Wireless World - Milan, Italy
継続期間: 2004 5 172004 5 19

Other

Other2004 IEEE 59th Vehicular Technology Conference, VTC2004-Spring: Towards a Global Wireless World
Italy
Milan
期間04/5/1704/5/19

Fingerprint

Orthogonal frequency division multiplexing
Maximum likelihood
Block codes
Frequency response
Fading (radio)
Multipath fading
Quadrature phase shift keying
Bit error rate
Antennas

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

これを引用

Kanemaru, H., & Ohtsuki, T. (2004). Interference cancellation with diagonalized maximum likelihood decoder for space-time/space-frequency block coded OFDM. : IEEE Vehicular Technology Conference (1 版, 巻 59, pp. 525-529)

Interference cancellation with diagonalized maximum likelihood decoder for space-time/space-frequency block coded OFDM. / Kanemaru, Hiroshi; Ohtsuki, Tomoaki.

IEEE Vehicular Technology Conference. 巻 59 1. 編 2004. p. 525-529.

研究成果: Conference contribution

Kanemaru, H & Ohtsuki, T 2004, Interference cancellation with diagonalized maximum likelihood decoder for space-time/space-frequency block coded OFDM. : IEEE Vehicular Technology Conference. 1 Edn, 巻. 59, pp. 525-529, 2004 IEEE 59th Vehicular Technology Conference, VTC2004-Spring: Towards a Global Wireless World, Milan, Italy, 04/5/17.
Kanemaru H, Ohtsuki T. Interference cancellation with diagonalized maximum likelihood decoder for space-time/space-frequency block coded OFDM. : IEEE Vehicular Technology Conference. 1 版 巻 59. 2004. p. 525-529
Kanemaru, Hiroshi ; Ohtsuki, Tomoaki. / Interference cancellation with diagonalized maximum likelihood decoder for space-time/space-frequency block coded OFDM. IEEE Vehicular Technology Conference. 巻 59 1. 版 2004. pp. 525-529
@inproceedings{f5f8a0a7b4ed41d189a9284bad6d6451,
title = "Interference cancellation with diagonalized maximum likelihood decoder for space-time/space-frequency block coded OFDM",
abstract = "Recently, Space-Time Block Coded OFDM (ST-OFDM) that applies Space-Time Block Code (STBC) to OFDM has been proposed. Space-Frequency Block Coded OFDM (SF-OFDM) has been also proposed where the block codes are formed over the space and frequency domain. ST-OFDM and SF-OFDM are known as the schemes that achieve good performance over the multipath fading environments and the fast fading environments, respectively. For the systems with two transmit antennas, the orthogonal conditions required to separate the received signals are that in ST-OFDM, the frequency responses of the consecutive two OFDM symbols are almost identical and that in SF-OFDM, the frequency responses of the adjacent two subcarriers are almost identical. In practical fading environments, however, these conditions of the orthogonality sometimes cannot be satisfied. In those environments, the received signals cannot be well separated and the performances are degraded. Recently, the diagonalized maximum likelihood decoder (DMLD) of new zero-forcing (ZF) type was proposed for the space-time block coded single carrier QPSK system to maintain the orthogonality of STBC under the fast fading environments and the flat fading environments, where the channel separation in DMLD is performed by the ZF algorithm using two receive signals at time index 2n, 2n + 1 (STC) or two subcarriers (SFC). Note that the matrix generated after the channel separation is not an identity matrix but the matrix proportional to an identity matrix. We show that ST/SF-OFDM with DMLD outperform ST/SF-OFDM in terms of Bit Error Rate (BER).",
author = "Hiroshi Kanemaru and Tomoaki Ohtsuki",
year = "2004",
language = "English",
volume = "59",
pages = "525--529",
booktitle = "IEEE Vehicular Technology Conference",
edition = "1",

}

TY - GEN

T1 - Interference cancellation with diagonalized maximum likelihood decoder for space-time/space-frequency block coded OFDM

AU - Kanemaru, Hiroshi

AU - Ohtsuki, Tomoaki

PY - 2004

Y1 - 2004

N2 - Recently, Space-Time Block Coded OFDM (ST-OFDM) that applies Space-Time Block Code (STBC) to OFDM has been proposed. Space-Frequency Block Coded OFDM (SF-OFDM) has been also proposed where the block codes are formed over the space and frequency domain. ST-OFDM and SF-OFDM are known as the schemes that achieve good performance over the multipath fading environments and the fast fading environments, respectively. For the systems with two transmit antennas, the orthogonal conditions required to separate the received signals are that in ST-OFDM, the frequency responses of the consecutive two OFDM symbols are almost identical and that in SF-OFDM, the frequency responses of the adjacent two subcarriers are almost identical. In practical fading environments, however, these conditions of the orthogonality sometimes cannot be satisfied. In those environments, the received signals cannot be well separated and the performances are degraded. Recently, the diagonalized maximum likelihood decoder (DMLD) of new zero-forcing (ZF) type was proposed for the space-time block coded single carrier QPSK system to maintain the orthogonality of STBC under the fast fading environments and the flat fading environments, where the channel separation in DMLD is performed by the ZF algorithm using two receive signals at time index 2n, 2n + 1 (STC) or two subcarriers (SFC). Note that the matrix generated after the channel separation is not an identity matrix but the matrix proportional to an identity matrix. We show that ST/SF-OFDM with DMLD outperform ST/SF-OFDM in terms of Bit Error Rate (BER).

AB - Recently, Space-Time Block Coded OFDM (ST-OFDM) that applies Space-Time Block Code (STBC) to OFDM has been proposed. Space-Frequency Block Coded OFDM (SF-OFDM) has been also proposed where the block codes are formed over the space and frequency domain. ST-OFDM and SF-OFDM are known as the schemes that achieve good performance over the multipath fading environments and the fast fading environments, respectively. For the systems with two transmit antennas, the orthogonal conditions required to separate the received signals are that in ST-OFDM, the frequency responses of the consecutive two OFDM symbols are almost identical and that in SF-OFDM, the frequency responses of the adjacent two subcarriers are almost identical. In practical fading environments, however, these conditions of the orthogonality sometimes cannot be satisfied. In those environments, the received signals cannot be well separated and the performances are degraded. Recently, the diagonalized maximum likelihood decoder (DMLD) of new zero-forcing (ZF) type was proposed for the space-time block coded single carrier QPSK system to maintain the orthogonality of STBC under the fast fading environments and the flat fading environments, where the channel separation in DMLD is performed by the ZF algorithm using two receive signals at time index 2n, 2n + 1 (STC) or two subcarriers (SFC). Note that the matrix generated after the channel separation is not an identity matrix but the matrix proportional to an identity matrix. We show that ST/SF-OFDM with DMLD outperform ST/SF-OFDM in terms of Bit Error Rate (BER).

UR - http://www.scopus.com/inward/record.url?scp=15344339877&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=15344339877&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:15344339877

VL - 59

SP - 525

EP - 529

BT - IEEE Vehicular Technology Conference

ER -