Introduction to Space-Time Wireless Communications
Introduction to Space-Time Wireless Communications
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Currently multiple-input multiple-output (MIMO) technology has been widely studied in both industrial and academic areas as it can be utilized to transmit multiple spatially parallel streams. The number of data streams (or layer), supported over MIMO channel, is the maximum number of Tx/Rx antennas, where one encoded block is conveyed over one layer or aggregated several layers. In some cases, the transmission quality on different layers are not the same, which can be utilized to optimize the encoded stream to layer mapping in order to improve the link level performance. In this paper, relying on non-equal importance of information and parity bits in decoding, a new method to map the information bits onto high quality layer, whereas parity bits onto low quality layers is proposed. The performance gain obtained from the optimized mapping scheme is verified via simulation results.