ICI and PAPR enhancement in MIMO-OFDM system using RNS coding

Abstract

The Inter-Carrier-Interference (ICI) and the Peak-to-Average-Power Ratio (PAPR) of the transmitted signal are considered as bottlenecks in the utilization of Multiple-Input-Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems, which caused a significant performance degradation. In this paper Residue Numbers as a coding scheme is impeded in MIMO-OFDM systems, where the PAPR values are analysed and compared to non-RNS coding systems, and the ICI levels are measured and evaluated with respect to the conventional ICI mitigation techniques as pulse shaping, windowing and self-cancellation techniques implemented in MIMO-OFDM system. The ICI errors, Bit-Error-Rate (BER) and the Complementary Cumulative Distribution Function (CCDF) for MIMO-OFDM system with Residue Number System (RNS) coding are analysed and evaluated. The results demonstrated a performance enhancement of the transmission model over the system without RNS implementation.

Analysis of cyclic prefix length effect on ISI limitation in OFDM system over a Rayleigh-fading multipath

“…AWGN Channel is the simplest channel [6] and the only parameter is the SNR [7] as shown in Figure 1.…”

“…Let 1 [ ] =0 −1 be the sample values of the received OFDM symbol 1 ( ) at = + . Then, by integrating (7) in the modulation process the discrete time form of the signal is obtained:…”

“…The spectral efficiency of the OFDM modulation is thus excellent because sub-carriers can overlap. Nevertheless, the most difficult issue to deal with is the inter symbol interference (ISI), resulting from the multipath distribution of the signal on the transmission channel [6], the use of cyclic prefix in the emission allows to reduce the complexity of terminals through the use of FFT algorithm [7].…”