Qinghua Zhao

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This paper investigates the tradeoffs between source coding, channel coding and spreading in CDMA systems, operating under a fixed total bandwidth constraint. We consider two systems, each consisting of a uniform source with a uniform quantizer, a channel coder, an interleaver, and a direct sequence spreading module. System A is quadrature phase-shift keyed(More)
We consider a CDMA system consisting of an image source coder, a convolutional channel coder, an interleaver, and a direct sequence spreading module. With different allocations of bandwidth to source coding, channel coding and spreading, the system is analyzed over a frequency selective Rayleigh fading channel. The performance of the system is evaluated(More)
This paper analyzes a CDMA system with a continuous uniform source, a scalar quantizer, and a hard decision block channel coder, under the constraint of fixed total bandwidth. The system employs a linear, minimum mean-square-error (MMSE) receiver for interference suppression. We study the performance for both additive white Gaussian noise (AWGN) and flat(More)
As the size of brain imaging data such as fMRI grows explosively, it provides us with unprecedented and abundant information about the brain. How to reduce the size of fMRI data but not lose much information becomes a more and more pressing issue. Recent literature studies tried to deal with it by dictionary learning and sparse representation methods,(More)
This paper investigates the tradeoffs of source coding, channel coding and spreading in CDMA systems. We consider a system consisting of an image source coder, a convolutional channel coder, an interleaver, and a direct sequence spreading module. With different allocations of bandwidth to source coding, channel coding and spreading, the system is analyzed(More)
This paper investigates the tradeoffs between source coding, channel coding and spreading in a CDMA system, operating under a fixed total bandwidth constraint. We consider a system consisting of a uniform source with a uniform quantizer, a channel coder, an interleaver, and a direct sequence spreading module. The system uses binary phase-shift keyed (BPSK)(More)
Homo sapiens longevity assurance homolog 2 of yeast LAG1 (LASS2), a metastasis suppressor gene of human cancer, is the most abundantly expressed member of the ceramide synthase gene family. Expression of LASS2 has been reported in carcinomas of the prostate, liver and breast. However, there has been no report on the expression of LASS2 in human bladder(More)