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

Hiroshi Kanemaru, Tomoaki Ohtsuki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Citations (Scopus)

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).

Original languageEnglish
Title of host publicationIEEE Vehicular Technology Conference
Pages525-529
Number of pages5
Volume59
Edition1
Publication statusPublished - 2004
Externally publishedYes
Event2004 IEEE 59th Vehicular Technology Conference, VTC2004-Spring: Towards a Global Wireless World - Milan, Italy
Duration: 2004 May 172004 May 19

Other

Other2004 IEEE 59th Vehicular Technology Conference, VTC2004-Spring: Towards a Global Wireless World
CountryItaly
CityMilan
Period04/5/1704/5/19

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

Cite this

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kanemaru, H & Ohtsuki, T 2004, Interference cancellation with diagonalized maximum likelihood decoder for space-time/space-frequency block coded OFDM. in IEEE Vehicular Technology Conference. 1 edn, vol. 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. In IEEE Vehicular Technology Conference. 1 ed. Vol. 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. Vol. 59 1. ed. 2004. pp. 525-529
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