Effect of Mutual Coupling on Capacity of Mimo Wireless Channels in High SNR Scenario

Abstract

Abstract-Theoretical results on the effect of antenna mutual coupling (MC) on capacity of multiple-input multiple-output (MIMO) wireless channels are presented in this paper with particular emphasis on the case of high signal to noise ratio (SNR) scenario. Two cases are considered, 1-channel capacity variations due to MC effect on correlation properties and target average receive SNR and 2-channel capacity variations due to MC effect on correlation properties at fixed average receive SNR. It is shown that the effect of MC on MIMO channel capacity can be positive or negative depending on the propagation environment spatial correlation properties and the characteristics of the transmitter and receiver MC matrices. Conditions where MC has positive and negative effects on MIMO channel capacity in the two considered cases are identified. Numerical results for half wavelength dipole antenna supporting the theoretical observations are presented.

Multiple Antenna Transmission Technique for Uwb System

“…In the case of 2 and 4 transmit antennas of CM 1 and 2 transmit antennas of CM2, the system can keep the orthogonality of preambles. However, in the other cases, MSE performances are very poor because the orthogonality of preamble is broken because of the reason that mentioned through (8) in Section 3.…”

“…However, due to spectral limitations, it is often impractical or sometimes very expensive to increase bandwidth. In this case, the scheme using the multiple transmit and receive antennas for spectrally efficient transmission is alternative solution [7], and moreover multi-input multi-output (MIMO) systems provide significant capacity gain in proportion to the number of antennas [8][9][10][11]. Therefore, we apply MIMO architectures using space-time block code (STBC) [13,14] to MB-OFDM UWB system.…”

Compact Dual-Band Printed Diversity Antenna for Wimax/Wlan Applications

“…Multipath fading is a serious problem especially in urban and suburban environment which will degrade the system performance. The use of multiple-inputmultiple-output (MIMO) technology is an effective way to improve the date rate and increase the channel capacity without sacrificing additional spectrum or transmitted power in a rich scattering environment [1][2][3][4][5]. Low mutual coupling between different ports of the multiple antennas is a pivotal to realize good performance of a MIMO system.…”

Effects of Interferences in Uhf Rfid Systems

“…Assuming an adjacent channel power ratio ACP R = 30 dB (see Figure 2(b), the SNR obtained in (12) and a channel bandwidth of CBW = 250 kHz, the phase noise is P N = −96 dBc/Hz@250 kHz, which is feasible to achieve in practice.…”

“…In a second step, these expressions have been extended by taking into consideration the presence of interferences in AWGN and Rayleigh channels. Finally, the concept of antenna diversity [11,12] is introduced to increase the probability of detection in presence of interferences. Antenna diversity allows for reducing considerably the reader-to-reader distance in a Rayleigh channel down to a distance close to the AWGN channel case.…”