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In this paper, an adaptive tone reservation technique with optimal subcarrier allocation awareness for multi-user OFDMA systems is investigated. In general, a variety of approaches have been proposed to cope with the PAPR problem in OFDM systems. A tone reservation (TR) is an effective technique for reducing PAPR, in which it does not need to transmit any side information and there is no distortion...
In this paper, we propose a modified Alamouti-based path selection (MAPS) strategy for multihop relay communication systems, and investigate a system performance in comparison with single path selection (SPS) and Alamouti-based path selection (APS) strategies. We also investigate the effect of a channel quality on the system performance when a channel is presumably good in the first hop and the last...
In this paper, we investigate a cooperative communication system with many different channel estimations, including the Amplifies-and-Forward (AaF), the proposed Estimate-and-Forward (EaF), and the proposed adaptive channel estimations. The proposed adaptive channel estimation shows the optimum performance in such a way that the error probability is closed to the EaF channel estimation, which yields...
An adaptive protocol based on minimizing a tight approximate symbol-error-rate (SER) significantly improves a performance of full-rate cooperative communication systems in comparison with existing protocols. This protocol crucially requires a short-term channel variance for computing such approximate SER, used in an adaptation process. In this paper, we propose a least square (LS) approach to estimate...
This paper presents an optimum power allocation strategy for the maximum likelihood based channel estimation in the space-time coded multiple-input multiple-output systems employing a data-bearing approach for pilot-embedding. The corresponding channel estimation error, the Chernoff's upper bound on the detection error probability, and a lower bound on channel capacity of such systems are analyzed...
Multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) is one prominent communication system for realizing high speed data transmission services. One critical issue for such systems is channel estimation. In this paper, we first develop a pilot-embedded data-bearing (PEDB) approach for joint channel estimation and data detection. Then we propose a least square (LS)...
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