Search

Novel general performance analysis of various multiple-input multiple-output (MIMO) systems over Hoyt distribution fading channel is presented and discussed in this study. Hoyt distribution, called sometimes Nakagami-q, spans over other distributions ranging from one-sided Gaussian ( q = 0 ) to Rayleigh fading ( q = 1 ). Hoyt channel describes short-term signal variation of certain wireless communications systems, as in satellite links with strong ionospheric scintillation. Average bit error rate analysis of space shift keying (SSK), quadrature spatial modulation (QSM) and spatial multiplexing (SMX) MIMO systems over Hoyt channel is evaluated and studied in this paper. As well, the generation of accurate joint phase and envelope statistics of the MIMO Hoyt channel is conferred and discoursed. It is reported that marginal performance degradation occurs when decreasing the Hoyt q function from 1 → 0.5 . Whereas, substantial performance losses are noticed for all considered MIMO systems when q < 0.5 . Derived analytical and asymptotic results are corroborated with Monte Carlo simulation results, where close match is reported for wide range of system and channel parameters. [ABSTRACT FROM AUTHOR]

Quadrature spatial modulation (QSM) multiple-input multiple-output system attracted substantial research interests lately driven by the several promised advantages. As well, cooperative communication is well-known to enhance the diversity gain and the overall system performance. In this paper, the theoretical capacity of amplify and forward (AF)-QSM system is derived and analyzed. In particular, the mutual information is first obtained and used to obtain the capacity. Derived formulas are corroborated through Monte Carlo simulation results over wide range of system and channel parameters. Besides, the impact of various parameters on the capacity and the mutual information of the studied system is investigated. The performance of AF-QSM is compared with AF-spatial modulation system and superior gains are reported. It is revealed that the capacity of AF-QSM is independent of the channel fading distribution where Rayleigh, Rician and Nakagami-m fading channels are considered. It is also reported that increasing the number of transmit antennas enhances the performance whereas increasing the number of relays degrades the performance. [ABSTRACT FROM AUTHOR]

This paper analyzes the performance of quadrature spatial modulation (QSM) multiple-input multiple-output (MIMO) system in cooperative decode and forward (DF) networks over correlated and imperfect η-μ fading channels. QSM is a recently proposed propitious MIMO technique that promises significant advantages over conventional MIMO schemes including high spectral efficiency with single RF-chain transmitter and very low receiver complexity. In this study, DF cooperative communication system adopting QSM technique is presented and throughly analyzed. Single or multiple DF relays are placed between the source and the destination to cooperate in the transmission process. Only the relays that decode the signal correctly will participate in the retransmission process. The end to end performance of the considered system is analyzed over correlated and imperfect η-μ fading channels. The η-μ channel is a general fading distribution that includes some other well-known channels, such as Rayleigh and Nakagami-m, as spacial cases. Monte Carlo simulation results are presented to corroborate the accuracy of the conducted analysis. The impact of spatial correlation, imperfect channel estimation and the fading parameters η and μ on the overall performance is investigated and exhaustively discussed. [ABSTRACT FROM AUTHOR]

Capacity analysis for millimeter-wave (mmWave) quadrature spatial modulation (QSM) multiple-input multiple-output (MIMO) system is presented in this paper. QSM is a new MIMO technique proposed to enhance the performance of conventional spatial modulation while retaining almost all its inherent advantages. Furthermore, mmWave utilizes a license-free wide-bandwidth spectrum and is a very promising candidate for future wireless systems. Detailed and novel analysis of the mutual information and the capacity for line of sight (LOS) mmWave-QSM system are presented in this study. The conditions under which theoretical capacity can be achieved are derived and discussed. Also, mmWave channel design is conducted and a novel algorithm is proposed to overcome existing limitation for unbalanced MIMO configurations, i.e., when the number of receive antennas is less than that of the transmit antennas. Monte Carlo simulation results are provided to corroborate derived formulas. It is shown that significant performance enhancements can be achieved under different system and channel configurations. [ABSTRACT FROM AUTHOR]

Spatial multiplexing (SMX) multiple-input multiple-output (MIMO) systems are promising candidates to enhance the achievable throughput and the overall spectral efficiency in future wireless systems. Performance studies of these systems over different channel conditions assume simplified models for the channel phase distribution. This paper highlights the impact of the channel phase distribution assumption on the performance of SMX MIMO systems. The Nakagami- m and the $$\eta -\mu$$ fading channels are considered in this study. In existing literature, performance studies of SMX MIMO systems over Nakagami- m fading channel assume uniform phase distribution. Though, it has been reported recently that the Nakagami- m channel phase distribution is not uniform. In this article, we show that the assumption of the channel phase distribution has a major impact on the performance of SMX MIMO systems. The obtained results demonstrate that the performance of SMX MIMO systems significantly varies with different channel phase distributions. Furthermore, it is shown that uniform assumption of channel phase distribution is incorrect and leads to erroneous conclusions. Detailed performance analysis for more accurate channel models are provided and results are sustained through Monte-Carlo simulations. [ABSTRACT FROM AUTHOR]