Improved codes for differential space-time-frequency coded OFDM

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

Abstract

With no channel state information (CSI) at the receiver, the highest possible diversity order for multi-antenna transmissions over frequency selective channels, is given by the product of the number of transmit and receive antennas and the multipath channel length, the same as the case with perfect CSI at the receiver. In this paper, we consider improved non-diagonal codes for differential space-time-frequency (DSTF) coded Orthogonal Frequency Division Multiplexing (OFDM), enabling the maximum spatial and multipath diversity without CSI at the receiver. While full diversity gain can be achieved by using existing differential unitary diagonal codes, we propose a systematic approach to designing non-diagonal codes for DSTF systems, which are block diagonal (BD) and have the necessary unitary and full diversity properties. We investigate not only the diversity product, but also other aspects of the distance spectrum, namely the so-called effective multiplicity in designing BD codes. Based on permutation techniques, we have devised new excellent-performing BD DSTF codes, which improve the coding gain up to 3dB as compared to their diagonal counterparts.

Original languageEnglish (US)
Title of host publicationConference Record - Asilomar Conference on Signals, Systems and Computers
EditorsM.B. Matthews
Pages345-349
Number of pages5
Volume1
StatePublished - 2004
EventConference Record of the Thirty-Eighth Asilomar Conference on Signals, Systems and Computers - Pacific Grove, CA, United States
Duration: Nov 7 2004Nov 10 2004

Other

OtherConference Record of the Thirty-Eighth Asilomar Conference on Signals, Systems and Computers
CountryUnited States
CityPacific Grove, CA
Period11/7/0411/10/04

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Ma, Q., & Tepedelenlioglu, C. (2004). Improved codes for differential space-time-frequency coded OFDM. In M. B. Matthews (Ed.), Conference Record - Asilomar Conference on Signals, Systems and Computers (Vol. 1, pp. 345-349)