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WiMAX performance evaluation considering different scheduling techniques has received considerable attention by WiMAX researchers and also WiMAX operators. The standard does not define MAC scheduling although it affects the overall QoS performance of users as well as the achievable total cell goodput. The primary goal of this paper is to compare the performance of maximum total goodput including the...
Future Communication networks are tending towards a diverse wireless networking world where the positioning information (PI) could be helpful in different techniques like the dynamic resource allocation. On the other hand, the PI could be widely used for cooperative techniques in the relay and/or routing selection process. In this paper, we propose to use the PI in the selection of the relays and...
Multiple-input multiple-output (MIMO) systems exploit transmit diversity to combat the effect of fading channels. Recently, a new paradigm known as cooperative communication was proposed that achieves the same transmit diversity as the MIMO system. However unlikely MIMO system which requires multiple antennas, cooperative communications use the scheme of sharing single antenna to generate a virtual...
Error rate performance of the layered spacetime code (LST) combined with Alamouti coding (AC) in flat Rayleigh fading channel is investigated. With the sorted-QR-decomposition-based decision feedback detector (SQRD-DFD), the channel matrix is Q-R decomposed with proper column permutation to minimize the possibility of error propagation. Error rate performance of the LST combined with AC is compared...
This paper presents a low-ML-decoding-complexity, full-rate, full-diversity space-time block code (STBC) for a 2 transmit antenna, 2 receive antenna multiple-input multiple- output (MIMO) system, with coding gain equal to that of the best and well known Golden code for any QAM constellation. Recently, two codes have been proposed (by Paredes, Gershman and Alkhansari and by Sezginer and Sari), which...
Near optimum iterative decoding of block codes in multiple input multiple output (MIMO) systems is proposed and analyzed applying a new suboptimal space time soft input soft output detector and Chase Pyndiah decoder for FEC detection. The suboptimal space time detector applies zero forcing detection to estimate the center and radius of the hyper-sphere which determines a subset of the most probable...
It is known that tail-biting codes T' constructed from trellis coded modulation (TCM) with a delay processor can achieve large minimum Euclidean distances. In this paper, concatenated space-time block coding (STBC) with T' for multiple-input multiple-output (MIMO) and MIMO-OFDM (orthogonal frequency-division multiplexing) systems is investigated. We propose an improved system which is implemented...
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