In this paper, we present an analytical study on the outage performance of a two-hop multiple-input and multiple-output (MIMO) amplify-and-forward (AF) relay network, where the source, relay and destination are all eq...
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ISBN:
(纸本)9781479982974
In this paper, we present an analytical study on the outage performance of a two-hop multiple-input and multiple-output (MIMO) amplify-and-forward (AF) relay network, where the source, relay and destination are all equipped with multi-antenna. Specifically, by applying the maximal-ratio-transmission (MRT) and maximal-ratio combining (MRC) for the transmitter and receiver of each hop, respectively, we first obtain the output signal-to-interference-plus-noise ratio (SINR) of the two-hop fixed gain MIMO AF relaying with multiple co-channel interferences (CCIs) and noise at the relay. Then, based on the specific functions, we present the closed-form outage probability (OP) expression of the consider AF relay network. Finally, computer simulations are provided to demonstrate the validity of the derived theoretical formulas, and indicate the effects of antenna combinations, CCI and power allocation on the outage performance of the consider two-hop AF relaying.
Near-field magnetic induction (NFMI) is a short range wireless technology that uses loop antennas coupled by a magnetic field. NFMI antennas are electrically small and thus extremely inefficient and narrow band, makin...
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Near-field magnetic induction (NFMI) is a short range wireless technology that uses loop antennas coupled by a magnetic field. NFMI antennas are electrically small and thus extremely inefficient and narrow band, making system design for multi-user and high-bitrate applications challenging. The goals of this thesis are to develop a test platform suitable for NFMI antenna testing, to model, design and test NFMI antennas that have high bandwidth-efficiency, and to explore the possibility of using MIMO (multiple-inputmultiple-output) to increase the capacity of the NFMI channel. This thesis provides system implementations, test results, and channel modeling to aid in the design of future NFMI systems. Implementation of a multi-channel discrete-time wireless system are provided for PC-based software and FPGA-based firmware as a platform for antenna testing. Optimized antenna designs in terms of efficiency and bandwidth are presented, achieving the theoretical bandwidth-efficiency bound for small antennas. Preliminary modeling and simulation results for the NFMI-MIMO channel are included, which show that the information-theoretic capacity of the NFMI-MIMO channel is approximately double the standard single-antenna NFMI capacity at 10 bits/s/Hz.
As demand for higher data-rate wireless communications increases, so will the interest in multiple-input and multiple-output (MIMO) systems. In a single transmit- ter, single receiver communication system, there is a ...
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As demand for higher data-rate wireless communications increases, so will the interest in multiple-input and multiple-output (MIMO) systems. In a single transmit- ter, single receiver communication system, there is a fundamental limit to the data- rate capacity of the system proportional to the system's bandwidth. Since increasing the bandwidth is expensive and limited, another option is increasing the system's ca- pacity by adding multiple antennas at the transmitter and receiver to create a MIMO communication system. With a T transmitter, R receiver MIMO communication sys- tem, T R channels are created which allow extremely high data-rates. MIMO systems are attractive because they are extremely robust as they are able to operate when encountering channels with severe attenuation also known as deep fades. MIMO sys- tems are known for their ability to achieve extremely high data-rates created by the multiple channels while improving bit error rate (BER) through diversity. This thesis examined the trade-offs in a 1 Terabit per second (Tbps) MIMO communication system that used Reed Solomon (RS) forward error correction (FEC) between an airship and an array of ground receivers. An airship, similar to a Zeppelin, and a series of ground receivers were used to simulate a MIMO system. Water filling and beam forming were implemented with different antenna ratios to examine the minimum number of antennas needed to achieve a 1 Tbps capacity. Performance metrics, including throughput and BER, were examined with different antenna ratios, different RS codes, and different types of modulation. The results showed that a higher receiver-to-transmitter ratio required fewer total antennas to achieve the capacity objective than a higher transmitter-to-receiver ratio. This thesis also indicated that a higher receiver-to-transmitter ratio yielded a lower BER.
This work presents a partial least square (PLS) based double exponentially weighted moving average controller (d-EWMA) of multiple-input and multiple-output (MIMO) processes subjected to constant or moderate gain shif...
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This work presents a partial least square (PLS) based double exponentially weighted moving average controller (d-EWMA) of multiple-input and multiple-output (MIMO) processes subjected to constant or moderate gain shifts disturbance. This study is mainly focused on a new gain monitoring method and a PLS based model updating. It was demonstrated that under the circumstance the variance of the first order difference of the latent control action would be more effective in detecting the gain shifts. The performance improvements are illustrated using a simulation problem from literature and applications to thickness control in a diffusion furnace of a local semiconductor facility. (C) 2011 Elsevier Ltd. All rights reserved.
Space-Time Block Coding (STBC) is a powerful transmit diversity scheme for multiple-input and multiple-output (MIMO) antennas systems. The M-aryphase-shift keying (MPSK) performance of STBC scheme is analyzed with the...
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ISBN:
(纸本)9781424410347
Space-Time Block Coding (STBC) is a powerful transmit diversity scheme for multiple-input and multiple-output (MIMO) antennas systems. The M-aryphase-shift keying (MPSK) performance of STBC scheme is analyzed with the MIMO system in independent and quasi-static flat Rayleigh fading channels. In this paper, we present the Bit-Error Rate (BER) of STBC system with Chemoff upper bound and also mathematic BER expression for system performance evaluation. Compared with Monte-Carlo simulation results [1,3,4], our theoretical results are confident and more important.
One objective in developing the next generation of wireless communication systems is to increase data rates and reliability. A promising way to achieve this is to combine multiple-input and multiple-output signal proc...
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One objective in developing the next generation of wireless communication systems is to increase data rates and reliability. A promising way to achieve this is to combine multiple-input and multiple-output signal processing with a space-time coding scheme, which offers higher coding and diversity gains and improves the spectrum efficiency and reliability of a wireless communication system. It is noted, however that time delay differences and phase differences among different channels increase symbol interference and degrade system performance In this letter we investigate phase differences and their effects on multiple-input and multiple-output systems, and propose a compensation algorithm for the Rayleigh fading model to minimize their effects.
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