A Hybrid Multiple Access Scheme Delivering Reliability Information
A Hybrid Multiple Access Scheme Delivering Reliability Information
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发表时间：
2003
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通讯作者：
Hendrik Schoeneich
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作者：
Hendrik Schoeneich
将IDMA （interleavedivision multiple access）多址方案与OCDMA （CDMA with orthogonal spreading sequences）相结合，得到一种新的混合多址方案，即OCDMA/IDMA。在足够大的用户数量下，新方案的性能优于IDMA，即使在高达3.75的比特负载下，新方案的性能也逐渐接近单用户性能。提出了一种基于解码器输出可靠性信息的链路自适应传输方案。研究了软解码器输出值作为IDMA和OCDMA/IDMA可靠性信息的可行性。结果表明，IDMA和OCDMA/IDMA都能提供正确的可靠性信息。这一特性使得OCDMA/IDMA方案对所提出的链路自适应系统非常有吸引力，特别是在需要高吞吐量和高自适应的情况下。
A multiple access scheme referred to as IDMA (interleave-division multiple-access) is combined with OCDMA (CDMA with orthogonal spreading sequences) to obtain a new hybrid multiple access scheme referred to as OCDMA/IDMA. The new scheme is shown to outperform IDMA for a sufficiently large number of users and asymptotically approaches single user performance even for a bit load of as high as 3.75. A link-adaptive transmission scheme based on the reliability information at the decoder output is presented. The feasability of the soft decoder output values as reliability information is examined for IDMA and OCDMA/IDMA. It is shown that IDMA and OCDMA/IDMA are suitable to deliver correct reliability information. This property makes the OCDMA/IDMA scheme very attractive for the proposed link-adaptive system, especially with the need for high throughputs in combination with high adaptivity.