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21-09-2016 | Issue 3/2017

Wireless Personal Communications 3/2017

Generalized Selection Combining Scheme for Orthogonal Space—Time Block Codes with M-QAM and M-PAM Modulation Schemes

Journal:
Wireless Personal Communications > Issue 3/2017
Authors:
Vidhyacharan Bhaskar, Divya Kandpal

Abstract

Multiple-input multiple-output (MIMO) systems implement multiple antennas to enhance diversity gain of wireless communication systems. Earlier work in generalized selection combining (GSC) focused on single-input multiple-output systems without space–time coding. Recently, with the aid of space–time coding, diversity gain became possible using multiple transmit antennas. In this paper, GSC scheme is applied to orthogonal space–time block codes (OSTBC) for 4 × L and 8 × L MIMO systems with various modulation schemes like M-PSK, M-QAM, and M-PAM in a slowly fading Rayleigh channel. The performance of GSC for half rate-full diversity, full rate-full diversity, and 3/4 rate-full diversity OSTBC is discussed and compared. Approximate closed-form expressions for symbol error rate (SER) and ergodic capacity for various OSTBCs are derived. The impact of channel estimation errors on system performance is also examined. Approximate closed-form expressions for performance bounds on SER and ergodic capacity of GSC for MIMO OSTBC are also derived and plotted.

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