We investigate a time-varying trellis coded multiple-access scheme using noncoherent mFSK signals. Techniques similar to this were originally proposed by Cohen, Heller, and Viterbi[1] and more recently in a mFSK form by Viterbi.[2] In these multiple-access systems van der Muelen[3] Ahlswede[4] Liao[5], Gaarder and Wolf [6], Kasami and Lin[7], Weldon[8] and Wolf[9] have shown that the decoded sy...

today, there arevarious statistical models for the discrete simulation of the rainfall occurrence/non-occurrence with more emphasizing on long-term climatic statistics. nevertheless, the accuracy of such models or predictions should be improved in short timescale. in the present paper, it is assumed that the rainfall occurrence/non-occurrence sequences follow a two-layer hidden markov model (hm...

AbstmctImplementation of the Viterbi decoding algorithm has attracted a great deal of interest in many applications, but the excessive hardwarehime consumptions caused by the dynamic and backtracking decoding procedures make it difficult to design efficient VLSI circuits for practical applications. A new transform algorithm for maximum likelihood decoding is derived from trellis coding and Vite...

In this paper we develop a new general Viterbi algorithm for multitarget tracking. A standard Multiple Hypothesis Tracking (MHT) formulation, based on Maximum A Posterior (MAP) estimation, is considered for optimally associating measurement data over time to form estimates of the multiple tracks. For estimating K tracks, a trellis diagram of the measurements is used to depict all track set hypo...

Convolution codes are one of the FEC codes that are used in every digital communication system. Convolution coding can be applied to block of data and also to a continuous input stream. Convolutional encoder can be viewed as a finite state machine.Viterbi algorithm is employed in wireless communications to decode the convolution codes. Such decoders are complex and dissipate large amount of pow...

The United States government has developed a new Federal Standard 2400 bps vocoding algorithm called MELP Mixed Excitation Linear Prediction [1]. This vocoder has very acceptable voice quality under benign error-free channel conditions. However, when subjected to high error conditions as could be experienced in tactical vehicular operations, amelioration techniques may be employed which take ad...

—The performance of convolutional codes decoding by the Viterbi algorithm should not depend on the particular distribution of zeros and ones in the input messages, as they are linear. However, it was identified that specific implementations of Add-Compare-Select unit for the Viterbi Algorithm demonstrate the decoding performance that depends on proportion of elements in the input message. It is...

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This work designs sequence detectors for channels with intersymbol interference (ISI) and correlated (and/or signal-dependent) noise. We describe three major contributions. i) First, by modeling the noise as a finite-order Markov process, we derive the optimal maximum-likelihood sequence detector (MLSD) and the optimal maximum a posteriori (MAP) sequence detector, extending to the correlated no...