Brijesh Kumbhani

Analysis of TAS/MRC based MIMO Systems over η − µ Fading Channels

ABSTRACT In this paper, we derive expressions for exact, approximate, and asymptotic symbol error rate (SER) of transmit antenna selection with maximal ratio combining (TAS/MRC) multiple input multiple output (MIMO) systems for several modulation schemes. We have assumed independent and identically distributed η − µ fading channels. We use a moment generating function (MGF) based approach to derive the expressions of SER. The expression for approximate SER is derived by approximating Q Function as a sum of exponentials. The expressions of SER are in the form of sum of converging infinite series for all values of fading parameters. The analytical expressions derived in this paper are also applicable to the SER performance analysis of TAS with selection combining at receiver (TAS/SC) systems. The analytical results are validated by comparing them with the results of extensive Monte Carlo simulations for different values of fading parameters. Finally, the SER performance of TAS/MRC systems and TAS/SC systems has been compared and superiority of TAS/MRC systems over TAS/SC systems has been demonstrated.

Performance analysis comparison of transmit antenna selection with maximal ratio combining and orthogonal space time block codes in equicorrelated Rayleigh fading multiple input multiple output channels

In this study, bit error rate (BER) performance of multiple input multiple output (MIMO) systems employing transmit antenna selection with maximal ratio combining (TAS/MRC) and orthogonal space time block codes (OSTBC) is analysed and compared. Analysis has been done for several modulation schemes in equicorrelated Rayleigh fading channels. Novel infinite series expressions for BER of TAS/MRC are proposed in this work. The authors observe that the existing literature on performance analysis of TAS/MRC in correlated channels implicitly or explicitly assume no correlation on the transmitter side. In this work the authors overcome this shortcoming. An alternate closed-form expression for BER performance of OSTBC MIMO systems is derived. This closed-form expression is computationally efficient than existing expressions. Monte Carlo simulations were performed to validate the analytical results. It has been observed that TAS/MRC outperforms OSTBC in terms of BER performance in equicorrelated Rayleigh fading channel. As a case study, performance comparison of cognitive radio (CR) links employing OSTBC and TAS/MRC MIMO systems is investigated in order to show the usefulness of the present analytical study. Even though TAS is the optimum transmit antenna technique in terms of BER performance, OSTBC seems to be a promising alternative for more realistic scenarios in CR systems.

Performance Analysis of MIMO Systems with Antenna Selection over Generalized κ − μ Fading Channels

Abstract In this paper, we derive closed form expression for outage probability and infinite series expressions for exact and approximate symbol error rate (SER) and capacity of multiple input multiple output systems with transmit antenna selection (TAS) over generalized independent and identically distributed κ − μ fading channels. The results are applicable to systems employing maximal ratio combining or selection combining at the receiver. Furthermore, by taking special cases, we present closed form expressions for outage probability of TAS systems over Nakagami-m and Rayleigh fading channels. The closed form expressions of outage probability for Nakagami-m and Rayleigh fading are computationally efficient than the expressions reported in the existing literature. The expressions of SER and channel capacity are in the form of sum of fast converging infinite series for all values of fading parameters. The analytical results are validated by comparing them with Monte Carlo simulation results for different values of fading parameters. The results of channel capacity shows that increased strength of line of sight component and decreased severity of fading degrades the channel capacity.

MGF Based Approximate SER Calculation of SM MIMO Systems Over Generalized η - μ and κ - μ Fading Channels

Spatial modulation (SM) is a multiple input multiple output (MIMO) wireless communication system that gives better spectral efficiency without costing extra bandwith for the same signal constellation size. In an SM MIMO system with

Analysis of space-time block coded spatial modulation in correlated Rayleigh and Rician fading channels

N_t

Interference mitigation Of UWB signal from IEEE 802.11a signal by template waveform processing using fourier transform

Nt transmitting antennas, spectral efficiency increases by

Error performance of two-hop decode and forward relaying systems with source and relay transmit antenna selection

log_2(N_t)