Jisung Oh

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— This paper considers optimal power allocation in a multiple access channel, where multiuser orthogonal frequency division multiplexing is employed. We propose a power allocation algorithm for minimizing the sum of transmitted powers, when each of users in a multiple access cell has a desired data rate. The optimal power allocation can be found very(More)
— This paper proposes a transmit power optimization algorithm for a Gaussian vector broadcast channel. The optimal power allocation minimizes the sum trace of input covariance matrices of all the users in the Gaussian vector broadcast channel. By duality the transmit power optimization can be transformed into an equivalent convex optimization in a multiple(More)
— This paper concerns a robust beamforming problem. Specifically, we consider the problem of maximizing the worst-case signal to interference plus noise ratio (SINR) in the presence of uncertainties in the steering vector. We give a zero-sum game-theoretic interpretation of the problem and prove the existence of a saddle point for the associated zero-sum(More)
In this paper, the architecture and the implementation of a 2K/4K/SK-point complex fast Fourier transform (FFT) processor for OFDM system are presented. The processor can perform 8K-point FFT every 2 7 3 p , and 2K-point every 68.26~s at 30MHz which is enough for OFDM symbol rate. The architecture is based on the Cooley-Tukey algorithm for decomposing the(More)
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