M-ary Spread Spectrum OFDM Hybrid Transmission with Multiple Subsets of Different Length Sequences

Based on multiple subsets with different length sequences, a novel hybrid transmission method for M-ary spread spectrum (MSS) orthogonal frequency division multiplexing (OFDM) systems is presented. Similar to traditional methods for MSS-OFDM transmission, orthogonality property will be preserved. However, due to the mixing of multiple subsets of sequences with different lengths, MSS-OFDM systems with hybrid transmission will obtain a higher data rate and more flexible subcarrier parameter settings. The data rate can be increased to several times of the traditional methods, and the number of subcarriers for MSS-OFDM transmission systems can be expanded from an integer power of 2 to a multiple of 4. At the same time, with the improvement of the above performance, the processing gain and peak-to-average power ratio properties of MSS-OFDM transmission system will decrease.