Effect of Correlated Non-Gaussian Quadratures on the Performance of Binary Modulations

The received signal in many wireless communication systems comprises of the sum of waves with random amplitudes and random phases. In general, the composite signal consists of correlated nonidentical Gaussian quadrature components due to the central limit theorem (CLT). However, in the presence of a small number of random waves, the CLT may not always hold and the quadrature components may not be Gaussian distributed. In this paper, we assume that the fading environment is such that the quadrature components follow a correlated bivariate Student-t joint distribution. Then, we derive the envelope distribution of the received signal and obtain new expressions for the exact and high signal-to-noise (SNR) approximate average BER for binary modulations. It also turns out that the derived envelope pdf approaches the Rayleigh and Hoyt distributions as limiting cases. Using the derived envelope pdf, we investigate the effect of correlated nonidentical quadratures on the error rate performance of digital communication systems.

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Analysis of Stacked Alamouti Coding in Wireless Communication

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.380-384.3505 ◽

2013 ◽

Vol 380-384 ◽

pp. 3505-3508

Author(s):

Yi Peng Li ◽

Hao Yang

Keyword(s):

Wireless Communication ◽

Upper Bound ◽

Communication Systems ◽

Signal To Noise Ratio ◽

Ergodic Capacity ◽

Wireless Communication Systems ◽

High Signal ◽

Signal To Noise ◽

Alamouti Scheme ◽

Alamouti Coding

Stacked Alamouti coding in MIMO wireless communication systems was analyzed through equivalent channel.We derive an upper bound on the portion of the ergodic capacity that the stacked Alamouti scheme can achieve, which is dependent on the ratio of number of transmit antennas to that of receive antennas in the high signal-to-noise ratio regime. As a conclusion, it is shown that the stacked Alamouti scheme can approach the channel capacity as long as the number of transmit antennas is no less than two times that of receive antennas.

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Multiuser Beam Index Modulation Wireless Transmission with Analogue Beamforming Networks

Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) ◽

10.2174/2352096511666180809130538 ◽

2020 ◽

Vol 13 (3) ◽

pp. 322-330

Author(s):

Xu He ◽

Yuan Ding ◽

Xingwang Li

Keyword(s):

Wireless Communication ◽

Communication Systems ◽

Signal To Noise Ratio ◽

Wireless Communication Systems ◽

High Signal ◽

Communication Scheme ◽

Single Radio ◽

Multiple Receiver ◽

Rf Chain ◽

Index Modulation

Background: The multiuser scenarios using the recently proposed wireless communication scheme, namely Beam Index Modulation (BIM), are investigated in this paper. Methods: Both transmitter node and multiple receiver nodes are equipped with analogue beamforming networks, transforming physical wireless propagation channels to virtue channels in beam domain. Results: Under the non-line-of-sight (nLoS) multi-scattered channel conditions, which are likely the cases for some future wireless communication systems operating at higher frequency bands. Conclusion: It has been proved, both through simulations and experiment, at 10 GHz in an indoor environment, that the proposed BIM is able to enhance the system performance at high Signal-to-Noise Ratio (SNR) scenarios, with regard to the sum spectral efficiency, with only a single Radio Frequency (RF) chain.

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