Abstract — In this paper, we construct a family of block orthogonal Golay sequences that have low peak-to-mean envelope power ratio (PMEPR) as well as blockwise orthogonal properties. We then present an application of the sequences to channel estimation of multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems. We compare the performance of the proposed algorithm with that of a frequency division multiplexing (FDM) piloting algorithm, and investigate the effect of co-channel interference (CCI) on the channel estimation performance. Index Terms — Channel estimation, Golay sequences, multipleinput multiple-output (MIMO), orthogonal frequency division multiplexing (OFDM), peak-to-mean envelope power ratio (PMEPR). the receiver. In order to facilitate channel estimation, the pilot sequences for the multiple transmit antennas are desired to be orthogonal to one another. Since Golay sequences give low PMEPR, it is natural to use them for OFDM systems. This is particularly true for the pilot sequences of the MIMO-OFDM system. It must be noted that low PMEPR of the pilot sequences allows power boosting of pilot signals compared with data signals, improving the accuracy of channel estimation. In , pilot sequences for two transmit antennas have been designed to be orthogonal over each pair of two subcarriers. In this work, we introduce block orthogonality by extending this idea to the number of transmit antennas of 2 n, and construct a family of Golay sequences that satisfy this property. Then we apply the sequences to channel estimation of MIMO-OFDM systems. Simulation results are provided to demonstrate the performance of the proposed channel estimation algorithm. In particular, we compare the performance of the proposed algorithm with that of a frequency division multiplexing (FDM) piloting algorithm taking co-channel interference (CCI) into consideration. I
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