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— An intuitive shortcut to understanding the maximum a posteriori (MAP) decoder is presented based on an approximation. This is shown to correspond to a dual-maxima computation combined with forward and backward recursions of Viterbi algorithm computations. The logarithmic version of the MAP algorithm can similarly be reduced to the same form by applying(More)
Forward Error Correcting (FEC) coding is a practical technique for increasing the transmission efficiency of virtually all digital communication channels. whatever their power or bandwidth limitations. Efficiency then applies to both the power and the bandwidth required to support a given information rate. or conversely to increase the information rate to(More)
22786 1.0 INTRODUCTION Loral Aerospace Corporation along with Qualcomm Inc. have developed a satellite system which offers global mobile voice and data services to and from handheld and mobile user terminals with omni-directional antennas. By combining the use of low-earth orbit (LEO) satellites with existing terrestrial communications systems and(More)