| 摘要(英) |
DSTM is a noncoherent channel coding for multiple antenna system, DSTM utilizes square matrices to encode data bits and then uses matrix multiplication to perform differential encoding. The resulting matrix after differential encoding is square, so the number of time slots for each transmission block is the same as the number of transmit antennas, NDSTC uses additional process which is square-to-nonsquare projection, so the resulting matrix is nonsquare which means less time slots.
In NDSTC, the data matrix is designed for the original square DSTM, not for the nonsquare transmission matrix. However, the projection in NDSTC destroies the properties of square DSTM. For example, the diversity and coding gains achieved by square DSTM are decreased due to reduced time units for transmission.In this thesis, we propose a new NDSTC scheme that does not use the square-to-nonsquare projection. In the proposed scheme, differential encoding is directly applied to the nonsqaure transmitted codewords. Two types of receivers are considered. One is the recursive decision feedback differential detection which is suitable for slowly-varying channels, and the other is the receiver requiring less coherence time than DSTM. Finally, we confirm from the simulation results that this scheme has a better error rate. |
| 參考文獻 |
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