Various differential space-time coding schemes were proposed, where neither the transmitter nor the receiver has the channel state information (CSI). In , a differential space-time block code (DSTBC) based on orthogonal designs was constructed by Tarokh and Jafarkhani (TJ). The performance of TJ'DSTBC is 3 dB worse than the corresponding coherent space-time block code (STBC). In this paper, we propose a new DSTBC scheme, which provides a coding gain due to the redundancy introduced by the differential encoder. The new code can be represented by a trellis. If the Viterbi algorithm is used in decoding, the code performs 1 dB better than TJ's scheme and is only 2 dB away from the coherent STBC . Furthermore, the new scheme has a recursive structure. If concatenated with an outer code, the new scheme with iterative decoding and no CSI can outperform the corresponding concatenated STBC with ideal CSI.
|Number of pages||1|
|Publication status||Published - 20 Oct 2003|
|Event||Proceedings 2003 IEEE International Symposium on Information Theory (ISIT) - Yokohama, Japan|
Duration: 29 Jun 2003 → 4 Jul 2003
|Conference||Proceedings 2003 IEEE International Symposium on Information Theory (ISIT)|
|Period||29/06/03 → 4/07/03|