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In this paper we discuss a novel storage scheme for simultaneous memory access in parallel turbo decoder. The new scheme employs vertex coloring in graph theory. Compared to a similar method that also uses unnatural order in storage, our scheme requires 25 more memory blocks but allows a simpler configuration for variable sizes of code lengths that can be implemented on-chip. Experiment shows that for a moderate to high decoding throughput （40-100 Mbps）, the hardware cost is still affordable for 3GPP＇s （3rd generation partnership project） interleaver. 相似文献
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INTRODUCTION The growing demand for wireless multimedia services requires reliable and high data rate commu- nications over a wireless channel. However, the reli- ability is significantly limited by the ability of com- bating the intersymbol interference (ISI) introduced by the time dispersive nature of the wireless channel. Multicarrier transmission systems, especially OFDM systems, have aroused great interest in recent years as a potential solution to overcome ISI (Hanzo et al., 200… 相似文献
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INTRODUCTION Multimedia wireless services require reliable high-bit-rate transmission over mobile radio channels. One of the challenges in designing such systems is the mitigation of fading propagation effects within the prescribed bandwidth and power limitations. Multi- ple-input and multiple-output (MIMO) techniques can be implemented to obtain a capacity gain in rich scattering environments without increasing the bandwidth or transmit power and/or to obtain the diversity gain to comba… 相似文献
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