Ahmet Faruk Coskun

Performance Analysis of Joint Single Transmit and Receive Antenna Selection in Nakagami-m Fading Channels

In this paper, multi-antenna systems employing both single transmit and single receive antenna selection (single TAS/single RAS) are examined for independent and identically distributed (i.i.d.) flat Nakagami-m fading channels. In this joint selection scheme, signal transmission and reception is performed over a single communication link with the highest signal-to-noise ratio (SNR). Exact bit/symbol error rate expressions for binary modulation, M-ary phase shift keying and square M-ary quadrature amplitude modulation signals are derived by using the moment generating function based analysis method. Also, upper bounds are obtained in order to show that the investigated systems achieve full diversity orders at high SNRs. Besides, outage probability analysis is carried out for examining system capacity. Analytical results are validated by simulations.

Performance Analysis of Maximal-Ratio Transmission/Receive Antenna Selection in Nakagami-

This paper focuses on multi-antenna systems that employ both maximal-ratio transmission and receive antenna selection (MRT&RAS) in independent and identically distributed Nakagami-m flat-fading channels with channel estimation errors (CEE) [or feedback quantization errors (FQE)] and feedback delay (FD). Useful statistics of the postprocessing signal-to-noise ratio (SNR) such as the probability density function, cumulative distribution function, moment-generating function, and th-order moments are presented. To examine the capacity and the error performances of the MRT&RAS scheme, ergodic capacity, outage probability, and bit error rates/symbol error rates (BERs/SERs) for binary and M-ary modulations are analyzed. Exact analytical expressions for all the performance metrics are separately derived for practical situations that consist of CEE (or FQE) and FD, as well as ideal estimation and feedback conditions. By considering approximations for the statistics of the postprocessing SNR, it is shown that, at high SNRs, the investigated system achieves full-diversity orders in the ideal case, whereas it keeps maintaining receive diversity at practical impairments. The performance superiority of the MRT&RAS scheme to other diversity schemes is also shown by numerical comparisons. In addition, analytical performance results related to the outage probability and BERs/SERs are validated by Monte Carlo simulations.

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In this paper, multiple-input multiple-output (MIMO) systems employing orthogonal space-time block codes (STBCs) with transmit antenna selection (TAS) are examined for uncorrelated flat Nakagami-m fading channels. Exact symbol error rate (SER) expressions for M-ary modulation techniques are derived by using the moment generating function (MGF)-based analysis method. In the SER analysis, the receiver antennas are assumed to use maximal ratio combining (MRC) whereas a subset of transmit antennas that maximizes the instantaneous received signal-to-noise ratio (SNR) is selected for STBC transmission. The derived SER results for different numbers of receive and transmit antennas are validated by Monte Carlo simulations and it is shown that the investigated systems achieve full diversity orders at high SNRs.

Fading Channels With Channel Estimation Errors and Feedback Delay

In this paper, multiple-input multiple-output (MIMO) systems employing both transmit and receive antenna selection (TAS/RAS) are examined for independent and identically distributed (i.i.d.) flat Nakagami-m fading channels. Exact bit error rate (BER) expression for binary phase shift keying (BPSK) and binary frequency shift keying (BFSK) modulations are derived by using the moment generating function (MGF)-based analysis method. In the analysis, the transmit-receive link that maximizes the instantaneous received signal-to-noise ratio (SNR) is selected for transmission and reception. Exact BER results for different numbers of transmit and receive antennas are validated by Monte Carlo simulations. Also, upper bounds are obtained in order to show that the investigated systems achieve full diversity orders at high SNRs.

Performance of space-time block codes with transmit antenna selection in Nakagami-m fading channels

In this paper, multiple-input multiple-output systems employing space-time block codes (STBCs) with transmit antenna selection (TAS) are examined for flat Nakagami-m fading channels. Exact symbol error rate (SER) expressions for M-ary modulation techniques are derived by using the moment generating function based analysis method. In the SER analysis, the receiver is assumed to use maximal ratio combining whereas a subset of transmit antennas that maximizes the instantaneous received signal-to-noise ratio (SNR) is selected for STBC transmission. The analytical SER results are validated by Monte Carlo simulations. By deriving upper and lower bounds for SER expressions, it is shown that TAS/STBC schemes achieve full diversity orders at high SNRs.

Performance of joint transmit and receive antenna selection in Nakagami-m fading channels

This paper proposes a novel reduced feedback-rate transmit diversity scheme employing transmit antenna selection (TAS) and Alamouti scheme yielding robust error performance at erroneous feedback conditions. Under ideal channel estimation and delay-free feedback assumptions, statistical expressions and performance metrics related to the post-processing signal-to-noise ratio of the proposed scheme are derived for Nakagami-m fading channels. Exact expressions for outage probability and bit/symbol error rates of M-ary signals are presented in order to provide an extensive examination on the system performance in the presence of feedback errors (FEs). The proposed scheme is shown to provide not only full-diversity order as the conventional and other reduced feedback-rate schemes for perfect feedback case but also superior error performance in the presence of FEs.

Performance Analysis of Space-Time Block Codes with Transmit Antenna Selection in Nakagami- m Fading Channels

Hybrid diversity systems have been of great importance because they provide better diversity orders and robustness to the fading effects of wireless communication systems. This paper focuses on the performance analysis of multiple-input gle-output systems that employ combined transmit antenna selection (TAS)/maximal-ratio transmission (MRT) techniques (i.e., hybrid TAS/MRT). The probability density function, the moment generating function and the nth order moments of the output signal-to-noise ratio of the investigated diversity scheme are derived for independent identically distributed flat Nakagami-m fading channels. The system capacity of the hybrid TAS/MRT scheme is examined from the outage probability perspective. Exact bit/symbol error rate (BER/SER) expressions for binary frequency shift keying, M-ary phase shift keying and square M-ary quadrature amplitude modulation signals are derived by using the moment generating function-based analysis method. By deriving the upper bounds for BER/SER expressions, it is also shown that the investigated systems achieve full diversity orders at high signal-to-noise ratios. Also, by Monte Carlo simulations, analytical performance results are validated and the effect of feedback delay, channel estimation error and feedback quantization error on BER/SER performances are examined. Copyright

Feedback-Rate Efficient Transmit Antenna Selection/Alamouti Scheme with Robust Error Performance in the Presence of Feedback Errors

In this study, joint single transmit and receive antenna selection systems are examined for independent but non-identically distributed flat Nakagami-m fading channels. Exact bit/symbol error rate expressions are derived for binary and M-ary signals by using the conventional probability density function-based analysis method and the moment generating function based analysis method for arbitrary and integer values of the fading parameters, respectively. Upper bounds are obtained in order to show that the investigated systems achieve full diversity order at high SNRs. Also, outage probability analysis has been carried out for examining system capacity. Theoretical results are validated by Monte Carlo simulations.

Performance analysis of hybrid transmit antenna selection/maximal-ratio transmission in Nakagami-m fading channels

In this work, bit/symbol error rate (BER/SER) performances of multiple-input multiple-output (MIMO) systems that employ Alamouti coded transmission with transmit antenna selection (TAS) are examined for independent but non-identical flat Nakagami-m fading channels. Exact BER/SER expressions are derived by using the moment generating function (MGF)-based analysis method for binary phase shift keying (BPSK), binary frequency shift keying (BFSK), M-ary phase shift keying (M-PSK) and M-ary quadrature amplitude modulation (M-QAM) signals. Also, upper bound expressions have been obtained in order to examine the asymptotic diversity order of TAS/Alamouti scheme. Monte Carlo simulations have validated the theoretical SER performance results derived for different numbers of transmit and receive antennas.

Performance analysis of joint single transmit and receive antenna selection in non-identical nakagami-m fading channels

The main objective of this paper is to examine the deterioration on the average error performance of military and civilian wireless communications systems (WCSs) that are in the vicinity of wind farms. By treating the total interference signal caused by any wind turbine (WT) as the ensemble of scattering signal replicas over the uniformly segmented parts of the WT that face different Doppler frequency shifts, path loss factors, etc., the time-varying characteristics of the total signal have been investigated by means of the varying configuration parameters. To expose the degrading effects of the wind farms on the received signal and the overall error performance of the WCSs, the scattering signal contribution of the segments of the mast and blades have been evaluated analytically by also taking physical optics-based radar cross-section (RCS) estimation method into account. Average bit error rate performances of digital modulation schemes have been examined theoretically and numerically via Monte Carlo simulations through the entire rotation period of the blades. With the aim of providing useful insights on the assessment of the performance degradation caused by the WT interference, this paper exposes miscellaneous numerical results related to different configurations and settlings.