SISO and MIMO OFDM Physical Layer Algorithms on a Heterogeneous Multiprocessor Platform - Implementations and Mapping Exploration

This paper presents the implementation and mapping exploration of the physical layer algorithms in a single input single output (SISO) and multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) systems on a commercial heterogeneous multiprocessor hardware platform. We focus our investigations on the algorithms for implementing two computation-intensive components of a MIMO receiver, FFT and MIMO demapping. Several implementation variants for FFT and MIMO-preprocessing (sorted QR Decomposition) are evaluated in terms of performance properties like bit error rate (BER), latency, etc. The cascading effects due to the finite word length of the fixed point implementations on the receiver performance, in terms of BER, are studied. The generic SISOOFDM system is implemented on a commercial heterogeneous MPSoC platform. Finally, the maximum achievable throughput as well as the latency issues for different spatial mapping configurations are presented.