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In this paper, we propose a practical strategy that integrates beamforming with MIMO (Multiple-Input and Multiple-Output) technique to both combat fading and diminish interference. By dividing the antenna array into several groups, termed subarray, virtual MIMO system is composed. In this paper, two kinds of antenna configuration are proposed, and both their array gain and diversity gain are analyzed...
In this paper we proposed a novel approach of blind channel equalizer for underwater multiple-input multiple-output orthogonal frequency diversity multiple (MIMO-OFDM) system. Convolutional encoder is applied on reference frequency bin and each block before entre the underwater MIMO-OFDM system. The transform imposed a correlation structure on the transmitted block, after every reference frequency...
This paper introduces two kinds of receivers, chip-level receivers and symbol-level receivers with Grake receivers. We propose an adaptive finger selection scheme of symbol- level receivers and it reduces almost a half of original complexity. When channel paths are dense, for symbol-level receivers with non-ideal channel estimation, we develop a receive scheme which combines channel estimation and...
In this paper, tabu search (TS) is applied to the detection algorithm of MIMO system, which is originally designed to find the approximate solution of combinatorial optimization problems. Resorting to an original two embedded cubes stereograph, we give a simple illustration of TS process. As a simple add-on to traditional suboptimal detectors, TS provides the potential of moving toward the best ML...
This paper presents a multi-input multi-output (MIMO) detector that combines probability data association (PDA) and sphere decoding (SD) algorithms. Because of the PDA's natural soft output, soft interference cancellation (SIC) idea is taken to improve the performance. In the presented combining scheme, two different iterative stopping criterions for PDA's module are discussed. Simulation results...
CDD is a transmit diversity method with high flexibility and low complexity in MIMO-OFDM system. It can be extended to SFN or MBMS application. In this paper, CDD in SFN is analyzed firstly. The value of delay parameter is very crucial providing to the receiver performance if cell common pilot pattern is used. A new channel estimator for CDD and corresponding pilot pattern is presented and analyzed...
Single carrier (SC) multiple input multiple output (MIMO) system with frequency domain equalization (FDE) is regarded as one of the best candidates for uplink broadband wireless communication systems. This paper proposes a FDE with ordered parallel interference cancellation (FDE-OPIC) for uplink SOMIMO system. Due to the gain brought by the ordering and Gauss-Seidel iteration, the proposed FDE-OPIC...
This paper proposes a promising detection that applies PSO (particle swarm optimization) as the selection of surviving paths in QRM detection for the coded MIMO system, named as QRM-PSO. Because only a few children nodes's metric are needed to calculate in the PSO search process, QRM-PSO can cut down the complexity further, while keeping the same performance as QRM due to the quasi-random movement...
In this paper, we propose a new idea based on sphere decoder (SD) to realize the tradeoff between the performance and the complexity of detection algorithm for MIMO systems, by decomposing a long signal vector required to be detected into several correlative short segments in the process of detection. It is visually named as split-tree SD since the set of all possible vectors can be represented by...
This paper proposes a detection for the coded MIMO systems that applies Dijkstra shortest path search with multiple surviving nodes to sphere decoder (SD). It is fitter to search multiple surviving nodes with a simple and direct strategy, leading to a very low complexity. And from the two aspects of time complexity and space complexity, we compare the proposed algorithm with QRM-MLD. Simulation results...
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