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A design technique to realise a low-complexity multiple-input multiple-output (MIMO) receiver using a time-multiplexed single front-end receiver is introduced. The architecture uses a simple front-end receiver where it delivers radio frequency signals to baseband section. The theory behind this architecture is analysed and the diversity gain of the proposed receiver is investigated. This simple MIMO...
Antenna selection is an attractive technique in MIMO system that improves the system performance and reduces the system complexity and cost. Throughput based antenna selection is new. This technique utilizes cross layer information to select k instead of M transmit antennas to maximize the throughput of the system. Throughput based transmit antenna selection is proposed in this paper when truncated...
The effect of DC offset on multi-input multi-output (MIMO) direct transceivers with adaptive modulation (AM) is discussed in this paper. A variable-rate variable-power (VRVP) AM system with perfect channel state information (P-CSI) at both the transmitter and receiver in a MIMO scenario is considered. The DC offset is modeled as a zero mean complex Gaussian distributed random variable. By this modeling...
In this paper, the wireless mesh backhaul using MIMO systems has been studied. In the mesh networking, information is routed from source to destination over multiple wireless links. On the other hand, using wireless MIMO systems, the channel capacity is significantly increased without additional signal power or bandwidth. We have used the linear programming to optimize the routing determination and...
This paper presents the implementation of a flexible 4times4 MIMO testbed. The subsystems are designed and fabricated in RF section. Then, implementing the baseband section with FPGA and using the flexible MATLAB interfaces, the various performance studies are conducted. To validate the overall system performance, the measurement results are presented. The excellent agreement between the analytical...
A low-complexity approach to the joint estimation of frequency offset and channel matrix in a MIMO flat-fading channel using a training sequence is presented. The frequency offsets for all transmit antennas are assumed to be equal. The proposed algorithm first computes an initial estimation. This estimation is good enough for most applications. To increase the accuracy of the estimation, approximation...
In this paper, the diversity-multiplexing tradeoff (DMT) for a multiple-input multiple-output (MIMO) channel with two transmitter and two receiver antennas (2times2 MIMO) at finite signal to noise ratio (SNR) has been studied. To characterize the trade-off, the outage probability of the mutual information between transmitted and received signals versus SNR is extracted. The diversity gain is the slope...
A cross layer approach based on adaptive modulation (AM) at the physical layer and truncated automatic repeat request (ARQ) protocol at the data link layer has been presented. To realize the system the MIMO channel is decomposed into single-input single-output (SISO) channels, then the probability density function in these sub-channels is extracted and approximated by Gamma distribution. An upper...
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