Distributed coding/modulation scheme with OFDM/OQAM based transmission for wireless cooperative relays systems

Abstract

In this paper, we propose a distributed coding/modulation scheme for wireless broadcast networks with relays. We consider a scenario where a source communicates with a single destination assisted by a relay which aids transmission to the destination. Orthogonal frequency division multiplexing (OFDM) transmission is considered where the available bandwidth is allocated simultaneously to the source and the relay. Real value data symbols are transmitted by the source. The relay decodes the information from the sources and it re-encodes them to generate some extra redundancy, which is modulated onto real data symbols and transmitted to the destination with a time offset equal to half the signal interval. Hence, the proposed scheme can be regarded as a distributed OFDM/OQAM scheme between the source and the relay. The proposed scheme achieves good performance in terms of bit error rate. Moreover, it does not require insertion of guard interval achieving therefore spectral efficiency gain.

Enhancing PAPR reduction for FBMC-OQAM systems by joint both tone reservation and companding methods

“…The Filter Bank Multi-Carrier (FBMC) based systems combined with Offset Quadrature Amplitude Modulation (OQAM) [1][2][3][4][5] are gaining appeal to be the favorite to become the radio waveform in forthcoming fifth Generation (5G) physical layer [6]. This advanced modulation scheme offers lots of advantages such as excellent frequency localization [7,8], low side lobes in its PSD (Power Spectral Density), robustness to phase noise and frequency offsets making it more suitable than OFDM for 5G [9].…”