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—We investigate the joint source-channel coding problem of transmitting nonuniform memoryless sources over binary phase-shift keying-modulated additive white Gaussian noise and Rayleigh fading channels via turbo codes. In contrast to previous work, recursive nonsystematic convolutional encoders are proposed as the constituent encoders for heavily biased(More)
—This paper uses M-ary chip symbols to increase the spectral efficiency of optical code division multiple access (OCDMA) even though, when compared to its binary counterpart, M-ary OCDMA can have significantly increased multiuser interference (MUI). The presented numerical channel capacity results show that appropriate non-uniform M-ary signaling allows the(More)
This paper proposes a performance evaluation technique for iteratively (turbo) equalized magnetic recoding systems. The technique decomposes the bit-error rate (BER) function into an integral of two functions. The first function has a closed form expression and is determined by the characteristics of the noise. The second function depends on the parameters(More)
—Iterative decoding is used to achieve backward compatible performance improvement in several existing systems. Con-catenated coding and iterative decoding are first set up using composite mappings, so that various applications in digital communication and recording can be described in a concise and uniform manner. An ambiguity zone detection (AZD) based(More)
We present performance limits of the optical code-division multiple-access (OCDMA) networks. In particular, we evaluate the information-theoretical capacity of the OCDMA transmission when single-user detection (SUD) is used by the receiver. First, we model the OCDMA transmission as a discrete memoryless channel, evaluate its capacity when binary modulation(More)