A new space-repetition code based on one bit feedback compared to alamouti space-time code

  • Authors:

  • Bita Sobhani

  • Affiliations:

  • Electrical Engineering Department, Isfahan University of Technology, Isfahan, Iran

  • Venue:
  • ELECTRO'06 Proceedings of the 4th WSEAS International Conference on Electromagnetics, Wireless and Optical Communications
  • Year:
  • 2006

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Abstract

Alamouti space-time code for two transmit antennas is most attractive due to simplicity of its encoding and decoding algorithms. However, it does not provide any coding gain. This paper proposes a new space-repetition code for two transmit antennas and one receive antenna based on one bit feedback. This can provide a relatively significant coding gain while it's encoding and decoding complexity is less than Alamouti code. Although the orthogonal design theory does not satisfy, the new code achieves maximum transmit diversity. Even if the reverse channel is not reliable, the performance of the new code still remains better than that of the Alamouti code. All the above advantages are achieved while preserving spectral efficiency with respect to Alamouti code. The only price paid for these advantages is one bit feedback from the receiver to the transmitter which can be easily returned with the ACK signal to the transmitter. Energy computations are also presented and it is shown that the new code can save energy compared to Alamouti code.