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Channel Estimation Using Cyclic Delay Pilot for MIMO Transmission

In the next generation mobile communication systems, multiple-input multiple-output (MIMO) multiplexing is a technique indispensable to achieve very high-speed data transmission with a limited bandwidth. In MIMO multiplexing, it is necessary to estimate all channel gains between transmit and receive antennas for signal detection at the receiver. In this paper, we propose minimum mean square error (MMSE) channel estimation using cyclic delay pilot for MIMO transmission. In the proposed channel estimation, the same pilot block is added different cyclic delays and simultaneously transmitted from different antennas for simultaneous estimation of all channels between transmit and receive antennas. We evaluate by computer simulation the bit error rate (BER) performance with the proposed channel estimation and compare to that with time-multiplexed pilot based channel estimation and code-multiplexed pilot based channel estimation.