Johan Hokfelt

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In this article, we design new turbo codes that can achieve near-Shannon-limit performance. The design criterion for random interleavers is based on maximizing the effective free distance of the turbo code, i.e., the minimum output weight of codewords due to weight-2 input sequences. An upper bound on the effective free distance of a turbo code is derived.(More)
The performance of a Turbo code can be severely degraded if no trellis termination is employed. This paper investigates the implications of the choice of trellis termination method for Turbo codes, and explains the origin of the performance degradation often experienced without trellis termination. An efficient method to derive the distance spectrum of(More)
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