Abstract
Orthogonal Frequency Division Multiplexing (OFDM) is readily employed in wireless communication to combat the intersymbol interference (ISI) effect with limited success because as the capacity of MIMO systems increases, other destructive effects affect the propagation channels and/or overall system performance. As such, research interest has increased, on how to improve performance in the mediums where fading and ISI permeate, working on several combinatorial techniques to achieving improved effective throughput. In this study, we propose a combined model of the Space-Time Trellis Code (STTC) and Single-Carrier Frequency Domain Equalization (SC-FDE) to mitigate multiple-fading and interference effects. We present analytical performance results for the combined model over spatially correlated Rayleigh fading channels. We also show that it is beneficial to combine coding with equalization at the system’s receiving-end ensuring overall performance: a better performance over the traditional space-time trellis codes.
Highlights
Wireless communication is constantly expanding in scope, complexity, and high demand of data usage thereby boosting its research profile
Bit Error Rate (BER) performance improves marginally as the channel becomes noisy for Space-Time Trellis Code (STTC)-FDE as compared to the basic STTC
This result demonstrates that it is possible to achieve higher level of coding gain with trellis coding alone, but in wireless communication systems targeting at broadband and mobile transmissions commonly face the challenge of fading channels that are both time and frequency selective, the use of space-time coding with equalization in the frequency domain improves the performance of the systems
Summary
Wireless communication is constantly expanding in scope, complexity, and high demand of data usage thereby boosting its research profile. In mobile outdoors environment, where a characterizing-mark is the absence of the line-of-sight, multipath fading and ISI influence is unavoidable. To mitigate this effect, a multicarrier scheme—OFDM—has constantly been incorporated in mobile designs. OFDM has proven limited success in combating ISI and multipath fading, it has inherent drawback because as the capacity of MIMO systems increases, other destructive effects affect the propagation channels and/or overall system performance [4]. Research interest has increased, on how to improve performance in the mediums where slow and fast fading and ISI permeate, working on several combinatorial techniques to achieving improved effective throughput. The background information on STTC and SC-FDE was examined, as well as the effect on the overall performance when combining coding with equalization at the receiver
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