This paper proposes novel space-time-frequency (STF) coding for multiantenna orthogonal frequency-division multiplexing (OFDM) transmissions over frequency-selective Rayleigh fading channels. Incorporating subchannel grouping and choosing appropriate system parameters, we first convert our system into a set of group STF (GSTF) systems. This enables simplification of STF coding within each GSTF system. We derive design criteria for STF coding and exploit existing ST coding techniques to construct both STF block and trellis codes. The resulting codes are shown to be capable of achieving maximum diversity and coding gains, while affording low-complexity decoding. The performance merits of our design is confirmed by corroborating simulations and compared with existing alternatives.
Bibliographical noteFunding Information:
Manuscript received May 14, 2001; revised May 13, 2002. This work was supported by the National Science Foundation under Wireless Initiative grant 9979442, ARO grant DAAG55-98-1-0336, and a grant from the ARL/CTA. Part of this work appears in the Proceedings of the International Conference on Acoustics, Speech, and Signal Processing, Orlando, FL, May 13–17, 2002 and in the Proceedings of Vehicular Technology Conference, Birmingham, AL, May 4–9, 2002. The associate editor coordinating the review of this paper and approving it for publication was Dr. Thomas L. Marzetta.
- Diversity methods
- Fading channels
- Space-frequency codes
- Space-time codes
- Space-time-frequency codes
- Transmit antenna diversity