Information-Theoretic Analysis of OFDM With Subcarrier Number Modulation

With the prevalence of orthogonal frequency-division multiplexing (OFDM) in many standards, e.g., IEEE 802.11, 802.16, DVB-T, and DVB-T2, a number variant modulation schemes based on OFDM have been proposed, which resort to signal sparsity further enhance spectral efficiency mitigate high peak-to-average ratio (PAPR) problem. Among these variants, with subcarrier (OFDM-SNM) has proven be efficient for simple communication systems low constellation orders limited decoding capability. To rigorously verify performance advantages OFDM-SNM, we present study OFDM-SNM this paper from information-theoretic perspective. In particular, determine an upper bound mutual information closed form by using log sum inequality. Also, analyze optimal pattern utilization probabilities (PUPs) channel-dependent coding propose easy-to-implement iterative algorithm approach PUPs. Moreover, considering practical achievability, Huffman achievable PUP vector construction scheme obtain PUPs corresponding rate. We carry out numerical simulations effectiveness illustrate obtained comparison several benchmarks.