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—Two-way cooperative communications are considered to improve the throughput of conventional one-way cooperative communications. For fast Rayleigh fading channels, we propose optimal and suboptimal non-coherent detectors for on-off keying (OOK) and frequency-shift keying (FSK) modulated two-way amplify-and-forward (AF) cooperative communications in this(More)
—Companding techniques, which are conventionally considered to reduce the peak-to-average power ratio (PAPR) for orthogonal frequency-division-multiplexing (OFDM) systems, decrease the achievable rate. However, we propose to employ clipping, one of the companding techniques, to improve the achievable rates for M-ary phase-shift-keying (MPSK)(More)
This paper discusses the design of a fast algrithm for motion estimation with emphasis on hardware cost considerations, real-time application, network adaptation , and exibility. T o a c hieve the best trade-o among hardware cost, computational complexity, and distortion performance, we propose a multi-stage pixel-subsampling motion estimation algorithm.(More)