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Multiuser cross-correlation channel estimation for SDMA/TDMA systems

A computationally efficient method for constructing zero correlation zone (ZCZ) sequences from optimal channel sounding sequences, which maximizes the length of the zero correlation zone (Z-zone) is proposed. The method is based on cyclic shifting of optimum sounding sequences. The proposed ZCZ sequences are specifically designed for cross-correlation channel estimation for single input multiple output (SIMO) communication systems. Our ZCZ sequence set permits the estimation of M space division multiple access (SDMA) user channels using only one correlator loaded with the mother sequence. The mother sequence is defined as the first sequence in the set. Further we show how frame synchronization is achieved with the proposed ZCZ sequence set. The proposed method offers computationally efficient real-time cross-correlation channel estimation for SDMA/TDMA systems.