Enhanced Alamouti Space-Time Block-Coding Transmission Based on a Developed OFDM System

Leftah, HA; Boussakta, S; Ikki, S

doi:10.1109/CSNDSP.2014.6923897

Enhanced Alamouti Space-Time Block-Coding Transmission Based on a Developed OFDM System

Lookup NU author(s): Professor Said Boussakta, Dr Salama Ikki

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Abstract

This paper presents a new Alamouti space-timeblock coding (STBC) orthogonal frequency division multiplexing (ST-OFDM) system. The transmitter of the proposed scheme is based on a low complexity X-transform that is developed in [1] as a modulation scheme instead of the inverse fast Fourier transform (IFFT). The proposed ST-X-OFDM scheme massively reduces the transmitter complexity, the effects of multipath channels, and the peak-to-average power ratio (PAPR). The complexity of the proposed scheme is evaluated and compared with the conventional ST-OFDM, showing that the proposed scheme is efficient, fast, and simple in implementation. An exact closedform bit-error rate (BER) is derived for the proposed scheme over multipath channels and different kinds of modulation formats. Computer simulations corroborated by mathematical results prove that, over frequency-selective multipath channels and different mapping schemes, the proposed approach achieves significant signal-to-noise ratio (SNR) gain in comparison to the ST-OFDMsystem. The proposed ST-X-OFDMsystem adopts only a single, low complexity transform at the transmitter without precoding and achieves significant BER improvement over the conventional ST-OFDM system.