Capacity and Performance of MIMO systems for Wireless Communications

Abstract

This paper presents the capacity performance of multiple antennas for wireless communication systems. Multiple antennas structures can be classified into single-input multiple-outputs (SIMO), multiple-inputs single output (MISO), and multiple-inputs multiple-outputs (MIMO) systems. Assuming that the channel is unknown at receiver, capacity expressions are provided for each structure. Our results also show that increasing the number of transmitting and receiving antennas for a wireless MIMO channel does indeed improve the channel capacity that can be obtained. __________________________________________________________________________________________ IntroductionDuring the past decade, Wireless Communications and especially mobile communication systems have grown considerably. The radio communication systems must meet a growing number of users and no less demand for new services. New digital technologies are currently being studied to determine the fourth generation of mobile communication systems with the objectives to provide high spectral efficiency and a wide variety of services. In this context, communication systems MIMO (Multiple Input Multiple Output) based on the use of an antenna array at the transmitter and receiver are able to offer high-speed transmission with a minimum quality of service guarantee. The intense research on MIMO systems was inspired by seminal works by Telatar [11] and Foschini and Gans [12] that showed a dramatic linear increase in channel capacity with the number of antennas [13]. MIMO systems allow us to operate two distinct dimensions of a radio link; the first being the Diversity and the second being the Capacity. In this paper we will focus on the Capacity of MIMO channels because it is a performance measure for digital communication systems and it is the maximal transmission rate for which a reliable communication can be achieved. This paper is organized as follows. Presentation of SISO, MISO, SIMO and MIMO Systems (Section II). Then we will present Capacity for all systems and we will concentrate to MIMO channels capacity in (Section III) and we will finish (Section IV) by a comparison between different multiantenna systems and the gain on capacity by increasing the number of antennas. MIMO Systems (SISO-MISO/SIMO-MIMO)

Scalp-Implantable MIMO Antenna for High-Data-Rate Head Implants

“…It can be observed that the channel capacity of the proposed MIMO antenna is higher than SISO configuration under similar conditions. Considering SNR = 20 dB, the proposed antenna has channel capacity of 19.9 which is almost three times higher than the SISO configuration of ≈5.89 bps/Hz [32]. Hence, this antenna is a promising candidate for high-data-rate head implants.…”

Performance Evaluation and Analysis of Massive MIMO channels for 5G Mobile Networks

“…In the continuing evolution of antenna array-based transmission systems, MIMO systems are emerging. These multi-antenna systems represent a combination of several transmit and receive antennas 11 , which allows to increase: the transmit and receive diversity, the capacity of the system, and the transmission rates.…”

“…Example of block diagram of a (N t x N r ) transmission MIMO system Now, let x i be the input data and y j the output data; it is assumed that noise can affect the transmission and, therefore, b j is considered to be white Gaussian noise of zero mean. Then, the output (y j ) of the system is 11 :…”

Metasurface based MIMO Microstrip Antenna with Reduced Mutual Coupling

“…In a digital communication system, capacity is used as performance measure. It is the maximum transmission rate of which communication can be achieved [4]. The channel capacity of a SISO system is given by the equation below [5].…”

“…4 lists antenna parameters at different values of the inset notch width. Where Gf=0.0837 is the calculated value obtained from equation (6.6).…”