Performance of the modulation diversity technique for κ-μ fading channels

Abstract

The performance of wireless communication systems can be significantly improved using the modulation diversity technique, which is based on the combination of a suitable choice of the reference angle of a signal constellation with independent interleaving of the symbol components. This technique has been evaluated considering different fading channel models, such as Rayleigh, Rice and Nakagami-m. However, in some specific scenarios, the tails of those fading distributions do not properly fit the experimental measured data, which demands the use of more general channel distributions. This article presents a performance evaluation of the modulation diversity technique for κ-μ fading channels. New expressions for the PEP (Pairwise Error Probability) are obtained using numerical integration, series representation and upper/lower bounds. The evaluation, based on Monte Carlo simulation, demonstrates that the performance gain of the modulation diversity increases as the fading becomes more severe. Communications channels exhibit some degree of time correlation, which cannot be perfectly estimated, affecting the performance of the modulation diversity system. Thus, a performance evaluation of the system, concerning the presence of temporal correlation and estimation errors in the channel is also presented in the article.

Error Probability of Multichannel Reception with \theta-QAM Scheme Under Correlated Nakagami-m Fading

“…In this paper a unified analysis is proposed for the compact receiver with spatial diversity. The maximum ratio combining (MRC) receiver for linear antenna arrays is considered, with the modulation scheme θ-QAM proposed in [10], [11]. It is worth mentioning that θ-QAM includes schemes such as Square Quadrature Amplitude Modulation (SQAM) and Triangular Quadrature Amplitude Modulation (TQAM), which are used in applications that range from synchronous transmission modems, with various constellations (16-QAM, 64-QAM and 256-QAM), to digital television, Digital Video Broadcasting Terrestrial (DVB-T) and International Standard for Digital Television (ISDB-T), in which the data are coded and arranged in blocks of 188 bytes, and sent to a segmenter and then arranged in one, two or three coding blocks, which are called layers.…”