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This paper derives the closed-form bit-error-rate (BER) expression for multiple-input multiple-output (MIMO) system with impulsive noise by using bi-parameter Cauchy-Gaussian mixture approximation. So far, little research has been investigated on analyzing MIMO system with impulsive noise, because the closed-form of the probability density function (pdf) of the impulsive noise does not exist except...
The performance of spatial multiplexing-based multiple-input multiple output (MIMO) systems using zero forcing (ZF) detector in frequency selective fading channels is analyzed in this paper. The approximation of a linear combination of Wishart matrices is used to derive the probability density function (p.d.f.) of output signal-to-noise ratio (SNR) expression. Analytical error rate expressions for...
In this paper, we modify background noise of multi-user detection, by selecting non-Gaussian noise of more harshly conditions such as Laplace noise and Alpha-Stable noise. Under the traditional MMSE algorithm, Comparing the BER of the two noises with Gaussian noise, which can get close to real complex environment and be beneficial to further research.
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...
For multiple-input multiple-output (MIMO) systems, the optimum maximum likelihood (ML) detection requires tremendous complexity as the number of antennas or modulation level increases. This paper proposes a new algorithm which attains the ML performance with significantly reduced complexity. Based on the minimum mean square error (MMSE) criterion, the proposed scheme reduces the search space by excluding...
The bit error rate (BER) performance analysis of maximum-likelihood (ML) based decode and forward (DF) cooperative diversity systems has been a subject of considerable interest. Exact analysis of ML-DF transmission has been considered a challenging problem due to the nonlinear characteristic of the ML detector. In this paper, we provide exact expressions for the BER of ML-DF cooperative systems employing...
An iterative detection aided down-link (DL) space division multiple access (SDMA) system is proposed. The base station (BS) requires DL channel state information (CSI) estimated by and fed back from the mobile station (MS) for separating the DL signals to be transmitted to the MSs from the BS. We investigate the achievable system performance subject to finite-accuracy CSI feedback. The achievable...
This paper proposes a hybrid method of uplink ACK/NACK signaling combining the advantages of both the non-coherent and the coherent methods. Simulations show that the proposed method improves the SNR performance by about 1 dB at the BER of 10-4 when compared with the coherent methods, with little loss in actual multiplexing capacity.
This paper describes a way to modify the K-Best Sphere Detector, using the knowledge that the real and the imaginary part of complex number are always orthogonal. To ensure that this property is used, a modification to the Real Value Decomposition is proposed that will ensure that the orthogonality is seen also after the decomposition. The proposed method allows for equally efficient implementations...
In this paper, we propose a robust STBC transmission scheme to combat the timing synchronization errors over frequency-selective multiple-access channels. First, the equivalent channel model in the presence of timing synchronization errors is derived and we find that the synchronization errors result in an equivalent channel model with larger number of correlated channel taps. Based on this correlated...
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