We study space-time block coding for single-carrier block transmissions over frequency-selective multipath fading channels. We propose novel transmission schemes that achieve a maximum diversity of order NtNr(L + 1) in rich scattering environments, where Nt (Nr) is the number of transmit (receive) antennas, and L is the order of the finite impulse response (FIR) channels. We show that linear receiver processing collects full antenna diversity, while the overall complexity remains comparable to that of single-antenna transmissions over frequency-selective channels. We develop transmissions enabling maximum-likelihood optimal decoding based on Viterbi's algorithm, as well as turbo decoding. With single receive and two transmit antennas, the proposed transmission format is capacity achieving. Simulation results demonstrate that joint exploitation of space-multipath diversity leads to significantly improved performance in the presence of frequency-selective fading channels.
Bibliographical noteFunding Information:
Manuscript received May 4, 2001; revised April 1, 2002 and August 30, 2002. This work was supported by the NSF Wireless Initiative under Grant 99-79443, the NSF under Grant 0105612, and by the ARL/CTA under Grant DAAD19-01-2-011. The material in this paper was presented in part at the IEEE Global Communications Conference, San Antonio, TX, November 2001.
- Block transmissions
- Frequency-selective multipath channels
- Space-time block coding