Jihwan P. Choi

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— In this letter, we propose two simple OFDM mean delay estimation schemes, channel impulse response (CIR)-based and differential schemes, which are applicable for adaptive algorithms including improved channel estimation and fast handover. Instead of time-domain processing requiring additional inverse fast Fourier transform (IFFT), the mean delay can be(More)
—This paper examines the detection problem of the preamble sequence index in the WiMAX system. The mobile station receiver knows all the possible preamble sequences and should estimate which preamble sequence has been transmitted from the base station. Since the preamble in the orthogonal frequency division multiplexing (OFDM) transmission is usually the(More)
—This paper addresses the optimal frequency reuse for the transmission of multimedia layered source which needs unequal target error rates or spectral efficiencies in its bitstream. We first analyze the crossover point of the outage probability curves for the full and partial frequency reuses, and show that that the crossover point in signal-to-noise ratio(More)