Abstract
In this study, we propose two hybrids concatenated Super-Orthogonal Space-Time Trellis Codes (SOSTTC) applying iterative decoding in Orthogonal Frequency Division Multiplexing (OFDM) over frequency selective fading channels. The coding scheme is based on the concatenation of convolution coding, interleaving and space-time coding along multiple-transmitter/multiple-receiver diversity systems. The Pair wise Error Probability (PEP) for the two proposed concatenated schemes is derived and their performance is evaluated using computer simulation with Maximum a Posteriori (MAP) iterative decoding algorithm. Simulation results based on the iterative decoding process show a significant improvement in the achieved error rate performance of the concatenated scheme over existing concatenated designs.
Highlights
Employing multiple transmit and/or receive antennas in a communication system is an effective method of increasing the information capacity gain of a wireless communication system (Telatar, 1999; Foschini and Gans, 1998)
Two concatenated schemes with constituent codes of convolutional and SuperOrthogonal Space-Time Trellis Code (SOSTTC) codes are proposed for MIMO Orthogonal Frequency Division Multiplexing (OFDM) systems
The first consists of a serial concatenation of a parallel concatenated convolutional code with a SOSTTC and the second involves parallel concatenation of two serially concatenated convolutional and SOSTTC codes in OFDM systems
Summary
Employing multiple transmit and/or receive antennas in a communication system is an effective method of increasing the information capacity gain of a wireless communication system (Telatar, 1999; Foschini and Gans, 1998). Space-Time Coding (STC) proposed by Tarokh et al (1998) combines channel coding, modulation, transmit diversity and/or receive diversity to guarantee a power and bandwidth efficient method of communication over fading channels. To improve the performance of STC in wideband frequency selective fading channels, two techniques have been proposed in literatures which are the use of orthogonal frequency division multiplexing and multichannel equalization (Sokoya and Maharaj, 2008, 2010). OFDM system uses a Cyclic Prefix (CP) of length that is longer than the delay spread of channel impulse response to efficiently avoid the effect ISI (Yu et al, 2012; Huang et al, 2011) and offers a high performance in physical layer and serves as a fascinating multicarrier scheme for many wireless networks (Shaowei et al, 2012)
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