Space-time (ST) coding techniques exploit the spatial diversity afforded by multiple transmit and receive antennas to achieve reliable transmission in scattering-rich environments. ST block codes are capable of realizing full diversity and spatial coding gains at relatively low rates; ST trellis codes can achieve better rate-diversity tradeoffs at the cost of high complexity. On the other hand, V-BLAST supports high rates but has no built-in spatial coding and does not work well with fewer receive than transmit antennas. We propose a novel linear block-coding scheme based on the Khatri-Rao matrix product. The proposed scheme offers flexibility for achieving full-rate or full-diversity, or a desired rate-diversity tradeoff, and it can handle any transmit/receive antenna configuration or signal constellation. The proposed codes are shown to have numerous desirable properties, including guaranteed unique linear decodability, built-in blind channel identifiability, and efficient near-maximum likelihood decoding.
Bibliographical noteFunding Information:
Manuscript received May 7, 2001; revised May 6, 2002. This work was supported by the National Science Foundation under CAREER award CCR-0096165 and award Wireless CCR-0096164. The associate editor coordinating the review of this paper and approving it for publication was Dr. Naofal M. W. Al-Dhahir.
- Blind channel identifiability
- Fading channels
- Multi-antenna systems
- Receive diversity
- Space-time codes
- Transmit diversity
- Wireless communications