Combined coding with modulation is an important topic. Conventionally, the free distance is taken as the principle criterion for computing the error probability for coding or modulation. In many cases, distance spectrum needs to be provided for analyze the Maximum likelihood decoding. However, it is difficult for computing the distance spectrum for a combined coding with modulation because of a nonlinear structure inside. In this thesis, we study the order of distance spectrum members to find some limited number of members to present the whole distance spectrum. In our previous work, we have built an augmented trellis for the combined coding with modulation. Applying the concept of difference by exclusive OR and regular subtraction to the augmented trellis, we build an improved virtual trellis. In this thesis, we expend the concept of subtraction to a pair relation. Thus, this augmented trellis is first composed of paired states and transition lines. Then, we use a partition principle to group the states and lines. Finally, the complex trellis is reduced to a reasonable structure. We therefore can apply distance spectrum computing algorithm to find the distance spectrum. The distance spectrum for different convolution codes and CPM systems are investigated by us. Experiments results have demonstrate this distance spectrum is more accurate than before.

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The design of two-dimensional signal constellations for the transmission of binary non-uniform memoryless sources over additive white Gaussian noise channels is investigated. The main application of this problem is the implementation of improved constellations where transmitted data is highly non-uniform. A simple algorithm, which optimizes a constellation by re-arranging its points in a pairwise fashion (i.e., two points are modified at a time, with all other points remaining fixed), is presented. In general, the optimized constellations depend on both the source statistics and the signal-to-noise ratio (SNR) in the channel. We show that constellations designed with source statistics considered can yield symbol error rate performance that is substantially better than rectangular quadrature amplitude modulation signal sets used with either Gray mapping or more recently developed maps. / Thesis (Master, Mathematics & Statistics) -- Queen's University, 2009-10-06 22:22:40.096

Thesis (M.S.)--Ohio University, November, 1992. / Title from PDF t.p.

Zugl.: Ulm, Univ., Diss., 2009

Thesis (M. Eng.)--Carleton University, 1992. / Also available in electronic format on the Internet.

This thesis is concerned with the construction of a transistorized pulse code modulation decoder, the purpose of which is to decode the digital signal into the continuous analog form. The earlier part of this thesis describes the design and construction of a transistorized decoder using the circulated pulse principle. This turned out to be not too practical. The latter part concerns the design and construction of a PCM decoder using a ferrite-core shift register. This design was successful. The decoder has been tested in conjunction with the coder built by R.A. Hafer. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

Typescript, etc. / Digitized by Kansas State University Libraries

International Telemetering Conference Proceedings / October 30-November 02, 1989 / Town & Country Hotel & Convention Center, San Diego, California / In order to suit the development of computer telemetry systems, we have developed the intelligent code-modulator and demodulation-decoder. In hardware, they consist of a monolithic processor and some high-integrated devices. Different code or decode ways and several subcarrier modulation or demodulation systems can be varied by carrying out corresponding software programs. In this paper, the equipments' hardware constructions and software cnarts and their main principles are presented.