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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...
In this paper, performance of Transmit Antenna Selection / Maximal Ratio Combining (TAS / MRC) in two hop Amplify-and-Forward (AF) relay system is analyzed over frequency non-selective and slowly Rayleigh fading channel. In the system, all nodes are equipped with multiple antennas; TAS is employed at the source and relay for transmission, MRC is employed at the relay and destination for reception...
In this paper rotation of signal constellation together with component interleaving is applied to the original PSK scheme and performance of rotated phase shift keying (PSK) scheme is analyzed over frequency non-selective slowly Nakagami-m fading channels. Then we obtained optimum rotation angles for M-PSK, M = 2,4,8. Numerical and simulation results show that Rotated PSK outperforms unrotated PSK...
In this work, a new closed form physical channel fading model, which we term m-n distribution, is introduced. The m-n distribution includes many distributions known in literature as special cases such as Rayleigh, Weibull, Nakagami-m, generalized gamma distributions, etc and their reciprocal distributions. Its statistical properties such as Laplace, Mellin moment generating functions and fractional...
In this work, better wavelet packet tree structures are searched to reduce the sum of ISI and ICI powers (integrated power) in Daubechies wavelet-based OFDM system over a practical two path low-voltage powerline channel or two way multipath channel. Better wavelet tree structures are obtained by using a brute-force algorithm. Results show that better wavelet packet tree structures perform better than...
In this work, we examined the performance of conventional DFT based OFDM and wavelet based OFDM (WOFDM) with and without Alamouti coding over multipath Rayleigh fading channels with exponential power delay profile. Results show that WOFDM has slightly better bit error rate performance than the conventional OFDM with and without Alamouti code. Besides the performance improvement of WOFDM as compared...
In this paper, the improvements in symbol error probability (SEP) / bit error probability (BEP) performances of rotated Phase Shift Keying (PSK) modulation are studied over Nakagami-m fading channels. Optimum rotation angles are obtained by the simulations, for different m values over frequency nonselective Nakagami-m slowly fading channels.
In this paper, improvements in symbol error probability (SEP)/bit error probability (BEP) performance of rotated phase shift keying (PSK) modulation using receive antenna diversity (combining) techniques are studied over frequency nonselective Nakagami-m slowly fading channels. Optimum rotation angles are obtained by the simulations. Effects of the rotation of signal consellations on the combining...
In this paper, new-diversity schemes are formed by applying Rotation and Component Interleaving Diversity (RCID) technique to Multi-Input Multi-Output (MIMO) Ortogonal Frequency Division Multiplexing (OFDM) systems and the optimal rotation angles for these systems are examined for M-ary PSK signal constellations. The examination showed that RCID technique has provided an increase in the diversity...
Closed-form moment generation function (MGF) expressions for the harmonic mean of N independent and not identically distributed generalized gamma random variables (RVs) are presented and some well known special cases are accentuated. The statistical results are also applied in order to obtain exact symbol error rate (SER) performance of wireless multihop transmission with non-regenerative relays and...
In this paper, we analyze the bit error rate performance of multi-processing gain (MPG) code division multiple access (CDMA) for deterministic spreading sequences over an asynchronous additive white Gaussian noise channel. Performances of Gold, Hadamard sequences are compared to that of random sequences. Results show that random code assumption is not realistic for MPG-CDMA since its performance differs...
In this work, symbol error rate (SER) performance of quasi synchronous (QS) CDMA system over frequency selective time non-selective multipath Nakagami-m fading channels is obtained for M-ary phase shift keying (MPSK) signaling, deterministic spreading sequences and different chip waveforms with a maximal ratio combiner (MRC) at the receiver. We show that the performance of QS-CDMA will be as good...
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