Giridhar D. Mandyam

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In this paper, we study the reliability as offered by the medium access control (MAC) and the radio link control (RLC) for the high speed downlink packet access (HSDPA) in a Wideband-CDMA (WCDMA) system. The Automatic Repeat reQuest (ARQ) mechanism in the RLC usually has considerable amount of delay associated with it which might not be able to sustain(More)
The discrete Laguerre transform (DLT) belongs to the family of unitary transforms known as Gauss-Jacobi transforms. Using classical methodology, the DLT is derived from the orthonormal set of Laguerre functions. By examining the basis vectors of the transform matrix, the types of signals that can be best represented by the DLT are determined. Simulation(More)
We investigate receiver designs and CQI (channel quality indicator) measures for the jointly encoded (JE) and separately encoded (SE) types of MIMO transmission. For the JE transmission, we develop a per-Walsh code joint detection structure consisting of a front-end linear filter followed by joint symbol detection among all the streams. We derive a class of(More)
In this paper, a new method to achieve lossless compression of two-dimensional images based on the discrete cosine transform (DCT) is proposed. This method quantizes the high energy DCT coeecients in each block, nds an inverse DCT from only these quantized coeecients, and forms an error residual sequence to be coded. The number of coeecients used in this(More)
The lossless compression of electroencephalographic (EEG) data is of great interest to the biomedical research community. In this paper, a two-stage technique of lossless compression involving decorrelating the sample points of the EEG signal and then entropy coding the resulting signal is examined. Two alternatives are presented for performing the rst(More)