Performance Analysis of a 64-QAM Rotated Constellation Subject to Rice Fading

Carlos Danilo M. Regis, Mariana Ferreira Mota, Rafael Fernandes Lopes, Marcelo Sampaio de Alencar

DOI: 10.14209/sbrt.2012.179

Evento: XXX Simpósio Brasileiro de Telecomunicações (SBrT2012)

Keywords: Rotated constellation Modulation Rice fading channel 64-QAM Transmission

Abstract

Fading, caused by multipath in wireless communi- cation, can degrade the performance of a digital communication system. A few techniques have been proposed to improve that performance, including constellation rotation. The rotated cons- tellation is a technique that introduces redundancy through a careful choice of the reference constellation angle. This letter presents an evaluation of that technique considering the trans- mission over a Rician fading channel, which is flexible enough to represent different transmission environments (open, suburban, low-density urban, medium-density urban area). The optimum angle of rotation of a 64-QAM scheme was obtained for those environments.

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