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A large class of physical phenomenon observed in practical wireless systems exhibits non‐Gaussian behavior. The performance of many multiuser detectors can degrade substantially in the presence of such impulsive ambient noise. In this paper, multiuser detection of space coded MIMO and code division multiple access (CDMA) signals under impulsive noise with diversity reception are investigated. We analyze...
The recently proposed Recursive Inverse (RI) Adaptive Filtering algorithm uses a variable step-size and the first order recursive estimation of the correlation matrices in the coefficient update equation which lead to an improved performance. In this paper, a new FIR adaptive filtering algorithm is introduced. This algorithm uses the second order recursive estimation of the correlation matrices in...
The main objective of the MAC protocol in IEEE 802.11 standard is to access and control the shared limited bandwidth medium efficiently and fairly among all nodes. A maximum throughput is difficult to achieve due to the limited bandwidth of the wireless ad hoc networks, packet overhead, and hidden and the exposed terminal problems. The use of NACK control packets instead of ACKs can minimize network...
In this paper, a new FIR adaptive filtering algorithm is introduced. This algorithm is based on the Quasi-Newton (QN) optimization algorithm. The approach uses a variable step-size in the coefficient update equation that leads to an improved performance. The simulation results show that the algorithm has very similar performance to the robust recursive least squares algorithm (RRLS) while performing...
This paper investigates the performance of an adaptive filter, (Frequency-Response-Shaped Least Mean Square (FRS-LMS) algorithm) for canceling impulsive components when the nominal process (or background noise) is a correlated, possibly nonstationary, Gaussian process. The performance of the algorithm in estimating a BPSK signal corrupted by a white and correlated impulsive noise is investigated....
An adaptive least mean square (LMS) type channel estimation algorithm is proposed. The proposed algorithm employs the frequency-response-shaped least mean square (FRS-LMS) algorithm which outperforms the LMS and the modified leaky LMS algorithms in a fading channel with correlated Gaussian noise. The algorithm is based on shaping the frequency response of the transversal filter by inclusion of a leakage...
The performance analysis of the zero-forcing successive interference cancellation (ZF-SIC) detector in vertical Bell labs layered space-time (V-BLAST) is generally considered under additive white Gaussian noise (AWGN) channel. However, a large class of physical phenomenon observed in wireless systems exhibit non-Gaussian behavior. In this paper we present the performance of the (V-BLAST) detection...
The multiuser detection of space coded, multi input multi output (MIMO), code division multiple access (CDMA) signals in the downlink direction with channel estimation error is investigated. The main challenge in the system is dealing with the errors in estimating the channel coefficients at the receiving antennas. The performance of the decorrelating detector (DD) under different channel estimation...
The performance of the frequency-response-shaped least mean square (FRS-LMS) adaptive algorithm in estimating a sinusoidal signal in impulsive and correlated noise is investigated. The algorithm does not require a priori knowledge about the nominal Gaussian process and is able to adapt to changes in the environment. The performance of the FRS-LMS is compared to that of the leaky-LMS algorithms in...
DS-CDMA is a multiplexing technique where a number of users simultaneously and asynchronously access a channel by modulating and spreading their information-bearing signals with preassigned signature sequences. Due to the near-far problem, the users' signals vary at the base station and this limits the performance of DS-CDMA systems. In this work, a closed-loop power control (CLPC) algorithm is proposed...
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