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LDPC-VBLAST for wireless communications Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/j098zf224

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  • Recently, the demand for higher data rates of transmission has increased in many wireless communication applications. Using multi-transmit and multi-receive antennas has been shown to be a solution, since it can increase the channel capacity to accommodate higher transmission rates. Among the popular techniques developed to exploit the use of multiple antennas, VBLAST (Vertical Bell Laboratories Layered Space-Time) architecture can provide a very high spectral efficiency. However, in order to have better performance, an efficient error correction coding scheme with low complexity to implement is needed. In this study, we applied the Low density parity-check (LDPC) codes to the multi-transmit and multi receive antennas system, by combining Euclidean geometry LDPC codes with VBLAST system. Different code rates and different numbers of antennas are evaluated. By Monte-Carlo simulation, it is shown that the combination of both LDPC-VBLAST improves the bit error rate performance of the conventional one. Higher code rates improve further bit error rate performance while maintaining a high transmission data rate. LDPC-VBLAST can achieve nearly the lower bound performance of LDPC coding used with the multiple antennas optimum detector, maximum likelihood (ML) detector, when increasing the number of receive antennas. However, unlike ML detector, LDPC-VBLAST has lower complexity than ML detector when increasing the number of antennas. Thus, LDPC VBLAST can be suitable for using in many wireless applications.
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