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首页> 外文会议>International conference on advances in computing, communications and informatics >Interference mitigation in downlink multi-beam LEO satellite systems using DS-CDMA/CI
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Interference mitigation in downlink multi-beam LEO satellite systems using DS-CDMA/CI

机译：使用DS-CDMA / CI的下行多波束LEO卫星系统中的干扰缓解

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The interference from adjacent beams of a low earth orbiting (LEO) satellite degrades the performance of users in area illuminated by desired beam. This paper investigates the advantages of employing Carrier Interferometry (CI) codes in downlink of a DS-CDMA based LEO satellite link to mitigate such interference. Qualitatively, use of these codes in a downlink LEO satellite channel offers following advantages: (1) Improved BER performance in interference dominant satellite channel resulting in improved capacity; (2) Significant reduction in bit error rate (BER) floor; (3) Lesser variation in performance with changes in number of active users; (4) Uniform cross-correlation characteristics over code space for uniform quality of service; and (5) Orthogonal CI codes with arbitrary integer spreading length can be generated. Quantitatively, these codes provide improvement in capacity by at least 50 percent at 15 dB and 20 degrees elevation, which further improves with increase in elevation angle. Moreover, the achievable BER floor is at least as low as that provided by 10 degree elevation gain in traditional codes. To obtain realistic results, Loo's statistical model for land mobile satellite (LMS) channel is assumed and the channel parameters for this model were taken from linear regression fits of experimental measurement results of real-world LMS channel.
机译：低地球轨道（LEO）卫星的相邻波束产生的干扰会降低所需波束照射区域中用户的性能。本文研究了在基于DS-CDMA的LEO卫星链路的下行链路中采用载波干扰测量（CI）码来减轻此类干扰的优势。从质量上说，在下行链路LEO卫星信道中使用这些代码具有以下优点：（1）干扰占主导地位的卫星信道中的BER性能提高，从而容量提高; （2）大大降低了误码率底限; （3）随着活跃用户数量的变化，性能的变化较小; （4）在代码空间上具有统一的互相关特性，以实现统一的服务质量; （5）可以生成具有任意整数扩展长度的正交CI码。从数量上讲，这些代码在15 dB和20度仰角下的容量至少提高了50％，并且随着仰角的增加而进一步提高。此外，可达到的BER最低限度至少与传统编码中10度仰角增益所提供的最低限度一样低。为了获得真实的结果，假设了Loo陆地移动卫星（LMS）信道的统计模型，并且该模型的信道参数取自真实LMS信道的实验测量结果的线性回归拟合。

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