Giridhar D. Mandyam

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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)
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)
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 full analysis is presented on digital-to-analog conversion for pulse amplitude modulated (PAM) systems. By analyzing the cyclostationary nature of pulse-amplitude modulation (PAM) systems, two methods of quantization are proposed – fixed and adaptive. Examples of this quantization analysis are provided for the reverse link transmitter chain(More)