Matlab simulations about the effect of LOS and XPD on ergodic capacity of a MIMO system with CSI known at transmitter

Closed-form evaluation of key performance indicators (KPIs) of telecommunication networks help perform mathematical analysis under several network configurations. This paper deals with a recent mathematical approach of indefinite quadratic forms to propose simple albeit exact closed-form expressions of the expectation of two significant logarithmic functions. These functions formulate KPIs which include the ergodic capacity and leakage rate of multi-user multiple-input multiple-output (MU-MIMO) systems in Rayleigh fading channels. Our closed-form expressions are generic in nature and they characterize several network configurations under statistical channel state information availability. As a demonstrative example of the proposed characterization, the derived expressions are used in the statistical transmit beamformer design in a broadcast MU-MIMO system to portray promising diversity gains using standalone or joint maximization techniques of the ergodic capacity and leakage rate. The results presented are validated by Monte Carlo simulations.

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Ergodic Capacity for Evaluation of Mobile System Performance

Journal of Engineering ◽

10.31026/j.eng.2020.10.10 ◽

2020 ◽

Vol 26 (10) ◽

pp. 135-148 ◽

Cited By ~ 1

Author(s):

Daroon Shaho Omer ◽

Mohammed Abdullah Hussein ◽

Luqman Mahmood Mina

Keyword(s):

System Performance ◽

Massive Mimo ◽

Rayleigh Fading ◽

Mimo System ◽

Ergodic Capacity ◽

Base Station ◽

Simulation Tool ◽

Mobile System ◽

Source Power ◽

Mobile Stations

In this research the performance of 5G mobile system is evaluated through the Ergodic capacity metric. Today, in any wireless communication system, many parameters have a significant role on system performance. Three main parameters are of concern here; the source power, number of antennas, and transmitter-receiver distance. User equipment’s (UEs) with equal and non-equal powers are used to evaluate the system performance in addition to using different antenna techniques to demonstrate the differences between SISO, MIMO, and massive MIMO. Using two mobile stations (MS) with different distances from the base station (BS), resulted in showing how using massive MIMO system will improve the performance than the standard SISO and MIMO techniques, under Rayleigh fading channel. Using MATLAB as a simulation tool it was found that the ergodic channel capacity enhance by increasing the power of the source and the base station antenna and it behaves in an opposite way with distance.

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Measured Performance Comparisons between Spatial Multiplexing and Beamforming Arrays in the 28 GHz Band

International Journal of Antennas and Propagation ◽

10.1155/2017/7253623 ◽

2017 ◽

Vol 2017 ◽

pp. 1-9

Author(s):

Dazhi Piao ◽

Xingning Jia ◽

Xiaochuan Ma ◽

Qingxin Guo ◽

Zengrui Li

Keyword(s):

Mimo System ◽

Signal To Noise Ratio ◽

Ergodic Capacity ◽

High Gain ◽

Spatial Multiplexing ◽

Robust Performance ◽

Signal To Noise ◽

Channel Matrix ◽

Capacity Gain ◽

Communication Distance

A spatial multiplexing (SM) array and a beamforming (BF) array with similar antenna size working at 28 GHz are designed and fabricated. In the SM array, a 4 × 4 MIMO system is realized with each port composed of a four-element subarray. In the BF array, the whole 16 elements are used to formulate a high-gain array. The measured S-parameters are in agreement with the simulated results. For both arrays, the channel capacities are computed by the measured channel matrix and signal-to-noise ratio (SNR) in an office room. Results show that capacity of the SM system is larger than that of the BF system, although the gain of BF array is about 5 dB larger than that of the SM array. However, the capacity of the SM array depends heavily on SNR; specifically, for the 1 dBm transmit power, communication distance R=25 cm, the ergodic capacity of the SM system is 2.76 times that of the BF system, and if R=250 cm, the capacity gain is reduced to 1.45. Furthermore, compared with the BF array, the SM array has a more robust performance over antenna misalignment, because of the wider beamwidth.

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Capacity Analysis of Multiple-input-multiple-output System Over Rayleigh and Rician Fading Channel

Cihan University-Erbil Scientific Journal ◽

10.24086/cuesj.v3n2y2019.pp70-74 ◽

2019 ◽

Vol 3 (2) ◽

pp. 70-74

Author(s):

Yazen Saifuldeen Mahmood ◽

Ghassan Amanuel Qasmarrogy

Keyword(s):

Channel Capacity ◽

Transmission Rate ◽

Mimo System ◽

Signal To Noise Ratio ◽

Multiple Input Multiple Output ◽

Ergodic Capacity ◽

Rician Fading ◽

Multiple Input ◽

Input Multiple Output ◽

Water Filling Algorithm

This paper aims to analyze the channel capacity in terms of spectral efficiency of a multiple-input-multiple-output (MIMO) system when channel state information (CSI) is known using water-filling algorithm and unknown at the transmitter side which it has been shown that the knowledge of the CSI at the transmitter enhancing the performance, the random Rayleigh and Rician channel models are assumed. Ergodic capacity and outage probability are the most channel capacity definitions which are investigated in this study. MATLAB code is devised to simulate the capacity of MIMO system for different numbers of antenna nodes versus different signal-to-noise ratio (SNR) values. In addition, the outage capacity probabilities for vary transmission rate and SNR are discussed.

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