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| Grouped Linear Constellation Precoding and Space-Time-Frequency Coding Based on Cyclic Delay Diversity |
| Fang Dong-mei; Tian Li-bin; Hu Bin-jie |
| Dept. of Electronic Eng., South China University of Technology, Guangzhou 510641, China |
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Abstract This paper proposes a new scheme that introduces cyclic delay diversity into Grouped Linear Constellation Precoding(GLCP) in an OFDM-based systems. By using cyclic delay diversity, a virtual delay spreaded channel can be get, and multipath diversity can be picked up by employing the grouped linear constellation precoding. This new scheme enables low decoding and equalization complexity. According to different channel models, different coding schemes can be designed, and at least get the same spatial diversity as space-time coding with equal number of transmit antennas. It is applicable to any number of transmit antennas with no loss in rate, too. Incorporated with STBC, a new STF coding can be constructed. Simulations reveal the performance merits of the new schemes.
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Received: 24 February 2006
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2007, Vol. 29 
