Performance comparison of V-blast using ZF, MMSE and LSQR algorithms
Performance comparison of V-blast using ZF, MMSE and LSQR algorithms
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Issue Date
2009
Authors
Masna, Rakesh
Vemsani, Naveen
Volkaji, Pramod
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Abstract
Currently wireless systems operate at low spectral efficiency because imperfect channels cause signal variations. The most recent study in information theory shows that rich- scattering wireless channel is capable of providing huge theoretical capacity, approaching 90% of the Shannon limit by using most high-flying technology, MIMO.
Layered space time codes have been designed to exploit the capacity advantage of multiple antenna system in a Rayleigh fading. Bell labs developed an architecture called as Bell-labs LAyered Space Time (BLAST). A simplified version of BLAST called V-BLAST has been developed and implemented by Wolniansky et.al. [1] in an indoor propagation environment.
This project proposes a low complexity detection scheme for vertical Bell labs layered architecture for space-time (V-BLAST) based on the LSQR decomposition. For a quasi stationary Rayleigh fading channel, a new cost efficient detection algorithm based on the LSQR has been introduced. In this analysis, we consider 16 quadrature amplitude modulation (16-QAM). Our simulation results show that LSQR decomposition method is better than zero forcing and minimum mean square error detection schemes.
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Wireless communications