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The faster decoding algorithm is still required in multiple-input multiple-output (MIMO) wireless communication technology. Lattice reduction (LR) technique can improve the performance of linear MIMO detection methods. LLL (Lenstra-Lenstra-Lovasz) algorithm is one of the LR techniques and it has being extensively used for better basis of channel matrix by removing noise. LR-aided detection algorithms...
Sphere decoding (SD) algorithm, as one of the main vector detection mechanisms in digital communication systems, has been referred to have polynomial complexity over a wide range of signal-to-noise ratios (SNRs), rates, and numbers of antennas. The first part of this paper discusses the expected complexity of the SD algorithm over all input SNRs and numbers of antennas, and derives the upper bound...
Cooperative communication is becoming a viable means of performance enhancement for wireless networks. It provides diversity by emulating multi-input and multi-output (MIMO) system for devices that are spatially too small to harbor multiple antennas. Conventional cooperative protocols such as amplify-and-forward (AF) and decode-and-forward (DF) attain diversity gain at a cost of reduced spectral efficiency...
Lattice reduction (LR) is a powerful technique for improving the performance of linear MIMO detection methods. The efficient LR algorithms can largely improve the performance of the linear detectors (LDs). However, there are two problems involved in the LR-aided detection algorithms. One is that, the reduced basis is still not orthogonal, and most existing LR-aided algorithms devote to find a near...
Cooperative wireless communication network provides diversity by emulating multi-input and multi-output (MIMO) system for devices that are spatially too small to harbor multiple antennas. Since mobility and easy handling require terminal miniaturization, cooperative communication is required to fill the gap for MIMO. Conventional cooperative protocols such as amplify-and-forward (AF) and decode-and-forward...
Cooperative communication is establishing itself as a viable means of performance enhancement for wireless networks. It provides diversity by emulating multi-input and multi-output (MIMO) system for devices that are spatially too small to harbor multiple antennas. Since mobility and easy handling require terminal miniaturization, cooperative communication is required to fill the gap for MIMO. Conventional...
Sphere decoding (SD) for multiple-input multiple-output (MIMO) systems has been shown to achieve maximum-likelihood (ML) performance with low complexity. However, the achievement of such an excellent performance-complexity tradeoff is highly dependent on initial choice of sphere radius. In this paper, we propose a new scheme of initial radius selection which has less computational complexity than...
In this paper, two classes of cooperative protocols for wireless relay networks are considered. Both classes of protocols consist of two transmission phases: broadcasting phase and cooperating phase. Protocol I - In the broadcasting phase, the source only broadcasts to all potential relays; during the cooperating phase, only the relays communicate with the destination. Protocol II - During the broadcasting...
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