Non‐orthogonal frequency division multiplexing based on sparse representation. Issue 16 (10th September 2018)

• Record Type: Journal Article
• Authors: Fu, Xiaomei; Chen, Li; Yang, Jingyu
• Is Part Of: IET communications. Volume 12:Issue 16(2018)
• Page Start: 2005
• Page End: 2009
• Publication Date: 2018-09-10
• Subjects: Rayleigh channels -- error statistics -- AWGN channels -- OFDM modulation -- signal representation -- demodulation; time delays -- demodulation -- Rayleigh channel -- additive white Gaussian noise channel -- bit error rate performance -- nonorthogonal frequency division multiplexing -- OFDM subcarrier -- orthogonal subcarriers -- orthogonal frequency division multiplexing -- frequency resources -- generated subcarriers -- spectral efficiency -- S‐NOFDM -- sparse representation; Telecommunication systems -- Periodicals; Speech processing systems -- Periodicals; 621.38205
• DOI: 10.1049/iet-com.2017.1260
• Languages: English
• ISSNs: 1751-8628

Abstract

Abstract : This study proposes a sparse non‐orthogonal frequency division multiplexing (S‐NOFDM) based on sparse representation to improve the spectral efficiency of orthogonal frequency division multiplexing (OFDM). The subcarriers of S‐NOFDM are generated from a subset of OFDM orthogonal subcarriers, which therefore requires less spectral resource. Each selected OFDM subcarrier is shifted into a group of overlapping subcarriers with different time delays. The modulated signal is produced by solving the sparse representation of the input signal under the generated set of subcarriers. The demodulation is simply a linear combination of generated subcarriers with the recovered modulated signal. Simulation results show that the proposed S‐NOFDM can achieve better bit error rate performance in an additive white Gaussian noise channel and a little worse than OFDM in a Rayleigh channel, with less frequency resources required.