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Jaya optimization algorithm (JOA) based multiuser detector over generalized-K (GK) fading channels, in the presence of impulsive noise, is presented in this paper to eliminate multiple access interference (MAI) problem. The JOA is used to implement the M-decorrelator with least squares (LS), Huber (HU), Hampel (HA) and modified Hampel (MH) estimators by minimizing the corresponding penalty functions...
We present in this paper about high level computation technique used in characterization of highresolution Sigma-Delta modulator Analog to digital (ADC) implemented with the help of software and Xilinx hardware EDA tool environment. This paper suggests high level computation of static and dynamic parameters of sigma delta Analog and converter. Novelty of the suggested computation method lies in terms...
The growing requirements of mobile broad band services like MIMO, combined with OFDM involved in 4g wireless networks were met by Long Term Evolution (LTE).OFDM is used in communication systems to provide high data rates, and is more immune to intercarrier interference, and intersymbol interference. OFDM has become the core of LTE system. In this paper the performance of the system is evaluated interms...
The rise in mobile data traffic demands from indoor users (UEs) coupled with poor cellular coverage in indoor environments, triggering the growth of Femto cell deployments. However, due to densification of Femtos, frequency reuse one, and lack of coordination among Femtos in LTE HetNets, cell-edge users of Macro cells, who are in the vicinity of Femtos, get affected by cross-tier interference of the...
Transmit diversity is created in the regular cooperative diversity (RCD) networks when the selected nodes assist the source by relaying its information signal to the destination using orthogonal channels to avoid co-channel interference. This decomposition is necessary because practical limitations in radio implementation prevent the relay from simultaneously transmitting and receiving on the same...
Most of the LTE (Long Term Evolution) network operators are deploying low power small cells in hotspots like airports, shopping malls and corporate offices to meet increasing data demands. Since users are not deemed to fixed locations in such places, the network experiences uneven distribution of traffic load across the cells which degrades the average user throughput. This problem is even more severe...
This paper, we evaluate the performance study of Long Term Evolution-LTE downlink with multiple input and multiple outputs (MIMO) system. MIMO transmissions schemes include transmit diversity and spatial multiplexing and MIMO detection schemes such as zero forcing and soft spheres decoding (SSD). The performance metrics considered are throughput and bit error rate (BER) and these are used to evaluate...
This paper we evaluates the performance of multiuser multiple input and multiple outputs (MU-MIMO) detection schemes. MIMO transmissions schemes include transmit diversity and spatial multiplexing and MIMO detection schemes such as zero forcing and soft spheres decoding (SSD). The performance metrics considered are throughput and bit error rate (BER) and these are used to evaluate the performance...
Multiuser MIMO (MU-MIMO) in which the base station transmits multiple streams to multiple users, has received significant importance as a way of achieving spectral efficiency (SE) and energy efficiency (EE). However, these two important design criteria conflict with each other and a careful study of their trade-off is mandatory for designing future wireless communication systems. This paper investigates...
We propose a novel real-time system design for multiband signal blind reconstruction using multi-coset sampling theory. Multi-channel signals are acquired under sub-Nyquist sampling frequency to perfectly reconstruct the original signal spectrum. A novel system design with Field-Programmable Gate Array (FPGA) implementation is presented in this paper. There are two main contributions in this paper...
Supervised approaches for speech enhancement require models to be learned for different noisy environments, which is a difficult criterion to meet in practical scenarios. In this paper, compressed sensing (CS) based supervised speech enhancement approach is proposed, where model (dictionary) for noise is derived from the noisy speech signal. It exploits the observation that unvoiced/silence regions...
A high degree of robustness is a prerequisite to operate speech and language processing systems in practical environments. Performance of these systems is highly influenced by varying and mixed background environments. In this paper, we put forward a robust method for automatic language identification in various background environments. Combined temporal and spectral processing method is used as a...
In this paper, we investigate the performance of the low-complexity algorithms based on Likelihood Ascent Search (LAS) and Tabu Search (TS) for detection in MIMO systems with channel estimation errors. Here, we briefly review the algorithms for LAS and TS and their variants and subsequently compare them for various MIMO settings. We provide the simulation results for BER performance in 2× 2, 4× 4...
The main goal of this paper is to understand the effects of frequency offset on orthogonal frequency division multiplexing (OFDM) systems and to present frequency offset estimation techniques so that we can correct for their effects. The performance of each technique is compared under various conditions. The performance of the estimators is presented in terms of the mean square error (MSE) and Signals...
In this paper, Long Term Evolution (LTE) Cellular networks provides higher bit rates and consequently higher spectral efficiencies. Quadrature Amplitude Modulation has been adopted by most wireless communication standards such as Long Term Evolution (LTE). We analyses the Bit error rate (BER) of M-ary QAM in both multipath fading channels such as Rayleigh fading and Additive white gaussian noise (AWGN)...
In this paper, we develop the first rigorous distributed algorithm for link scheduling in the SINR model under any length-monotone sub-linear power assignments. Our algorithms give constant factor approximation guarantees, matching the bounds of the sequential algorithms for these problems, with provable bounds on the running time in terms of the graph topology. We also study a related and fundamental...
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