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Polarity-Based Detection Method of QPSK Sequences for M-ary Spread Spectrum OFDM Communications

M-ary spread spectrum is a common method to increase the data rate under the premise of ensuring certain transmission quality. A detection method of M-ary spread spectrum sequences is proposed on the basis of element polarity in this paper. By adding a certain implementation complexity, the data rate of M-ary spread spectrum system will be further increased. When orthogonal frequency division multiplexing (OFDM) modulation is adopted, the corresponding property of peak-to-average power ratio is also analyzed. We provide the polarity-based detection structure and demonstration examples. The calculation results show that the proposed method can increase the data rate without reducing the other performance of M-ary spread spectrum OFDM system.