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In this paper, the expression for symbol error rate (SER) or BER of linear modulation in Rayleigh fading as a function of signal-to-noise ratio (SNR), modulation scheme and diversity order, is inverted, thereby giving SNR as a function of SER. The key is to represent the PDF (or MGF) by a Maclaurin series and discard all but the first one or two terms. For large SNRs, the first term in the series...
Ultra-wideband (UWB) has been considered a viable and an innovative solution for future short-range high-speed wireless communication systems. One of the big concerns for UWB devices to function properly is the narrow band interference (NBI) issue, which must be carefully studied. For this purpose, the performance of UWB communication system over indoor Lognormal fading channel in the presence of...
This paper considers a two-way amplify-and-forward (AF) relay network, where two users communicate with each other through an intermediate relay over asymmetric Nakagami-m channels. The average bit-error rate (BER) performance is analyzed for the relay under average power scaling (APS) and instantaneous power scaling (IPS) constraints. We demonstrate that this network operating in two time slots not...
Closed-form expression of average Bit Error Rate (BER) is developed for Chip-Interleaved DS-CDMA system that conducts M-ary communication and non-coherent demodulation in AWGN channel with flat Rayleigh fading. The transmitter uses BPSK modulation and employs binary pseudo-random sequences for symbol-spreading. In receiver the non-coherent demodulation is based on the optimal quadrature demodulator...
We study the influence of atmospheric turbulence on satellite communications by the theoretical analysis of propagation characteristics of electromagnetic waves through inhomogeneous random media. The analysis is done by using the moment of wave fields given on the basis of a multiple scattering method. We analyze the average bit error rate (BER) which is derived from the probability density function...
In the paper, BER (bit error rate) performance of MA-CSK (multiple access chaos shift keying) is studied to find out what factors govern the performance of MA-CSK system. Further, it is investigated how each factor take impact on BER performance. Through theoretical analysis and computer simulation, it is verified that better BER performance for a certain user is contributed by lower autovariance...
Extremely short duration of pulse introduces stringent requirements to the UWB system synchronization. Especially in RAKE scheme, a small timing jitter of system causes performance degradation severely due to the decreased energy acquired by local template. In this paper, a novel method of timing jitter suppression is proposed, in which the cross-correlation function between local template and received...
In this paper, we propose a new resource allocation scheme that enhances a diversity effect with taking into account a proportional fairness (PF) in downlink MIMO-OFDMA-CDM (multiple input multiple output - orthogonal frequency division multiple access - code division multiplexing) systems. In the proposed scheme, spectral resources are allocated per subcarrier unit and full code-spreading is done...
For these communication systems whose transmitted waveforms have a much closed signal space, such as the attractive Ultra Narrow-band (UNB) modulation technology, it is rather toilsome to obtain the satisfactory performance because of the difficulty in accurately determining the threshold of the optimum receiver, which is mainly caused by its tiny waveform dipartition as well as the unruly DC variant...
In this paper, a new method to model and simulate a wireless communication system based on system on chip design methodology will be presented. The network performance effected by the amount of detail in the simulation model. Hence there is a need to develop suitable abstractions that maintain the accuracy of the simulation while keeping the computational resource requirements low. The integration...
The major obstacle to shallow water acoustic communication is the interference of multipath signal results from surface and bottom reflections. Channel coding is indispensable in practical system to accommodate these adverse channel transmission characteristics due to the coding gain. In this paper, a channel model including time-varying fading, multipath and additive noise for the shallow water acoustic...
One of the novelties of the forthcoming LTE technology is the use of SC-FDMA as the transmission technique in the uplink. In this paper a study of the BER in an interleaved SC-FDMA system over a fading channel is presented. This study provides the mathematical grounds to obtain a closed-form expression for the BER for BPSK and square M-QAM. Results are validated by means of comparison with simulations.
The performance of a two-hop amplify-and-forward relay link in flat Rayleigh fading channels is analyzed. Closed-form expressions are obtained for the distribution of the instantaneous signal-to-noise ratio (SNR). An expression for the error probability is presented in general, and the bit-error rate (BER) associated with binary differential PSK (BDPSK) and the symbol-error rate (SER) associated with...
In the decoding process of LDPC codes, variable node messages often fluctuate continuously and thereby become the hindrance to the successful decoding. This paper proposes an adaptive erasure belief propagation (AE-BP) decoding algorithm to reduce the influence of these unreliable messages. The idea behind AE-BP is recording the continuous fluctuant times of variable nodes by introducing a sequence...
We introduce in this paper a novel particle-filter-based distributed algorithm for blind equalization of frequency-selective communication channels. In the considered scenario, multiple receivers observe independently distorted versions of the same broadcast signal, and cooperate to recover it. The new algorithm differs from previous methods by employing a parametric approximation to reduce the associated...
In this paper, a new M-estimator based multiuser detection in asynchronous flat-fading non-Gaussian CDMA channels is considered. A new closed-form expression is derived for the characteristic function of the multiple-access interference signals. Simulation results are provided to prove the effectiveness of the derived bit-error probabilities obtained with this expression in asynchronous flat-fading...
In this paper, the ground-to-air channel model is studied and the simulation results of the model are provided. Then, we implement it in the improved single carrier frequency domain equalization (SC-FDE) system and compare the transmission characteristics in different conditions. Theoretical analysis and simulation results show that the BER performance of the proposed system can reach 10-7 or even...
This paper proposes a simple series form formula of the bit error rate (BER) for DBPSK/OFDM signals under time selective nonlinear fading channels. The proposed approach derives the theoretical BER in the presence of non-linear distortion and time selective fading effects. Since the BER is represented by the simple series form formula, the proposed approach frees us from the time-consuming computer...
In this paper we derive a lower bound on the bit error rate (BER) for the individual bit streams that can be mapped simultaneously in an hierarchical way onto generalized multilevel quadrature amplitude modulations (M-QAM). The expressions are valid for time-discrete multipath Rayleigh fading environments with imperfect channel estimation and can be regarded as an extension of the well-known matched...
In this paper, making use of the relaying concept, which enables single-antenna devices to benefit from spatial diversity, a statistical analysis of dual-hop cooperative links using semi-blind (fixed gain) relays and partial relay selection, is provided. The selection scheme considers that the source monitors the connectivity among the nodes (relays) of the first hop only; an interesting assumption...
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