SER Optimization of OFDM Based AF Relaying in the Presence of AWGGN

Abstract

This paper studies joint power allocation and subcarrier pairing strategies for an orthogonal frequency division multiplexing-based amplify and forward relay system. The optimization target function is symbol error rate (SER) in the context of an additive white generalized Gaussian noise (AWGGN), which encompasses numerous noise types. For instance, the familiar additive white Gaussian noise (AWGN) is just a special case of AWGGN. At a given data rate, the SER performance is optimized under total and individual power constraints, respectively. Simulation results demonstrate superior performance gap through our adaptive resource allocation approach over equal power allocation as well as fixed subcarrier pairing strategies. The impacts of practical issues on the SER performance, such as relay location and unequal power budgets at a source and a relay, are further discussed.

Keywords

• OFDM
• SER
• AWGGN