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首页> 外文学位 >Investigation of an iterative groupwise soft input/soft output multiuser detection algorithm.
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Investigation of an iterative groupwise soft input/soft output multiuser detection algorithm.

机译：研究了迭代的逐组软输入/软输出多用户检测算法。

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摘要

This thesis investigates the performance of a novel iterative soft input/soft output groupwise multiuser detector (MUD). In general, multiuser detectors improve performance by explicitly accounting for the interference when detecting all users together. In this thesis, the interference is assumed to be a product of users whose channel gains are known. The novel technique extends the group detector MUD with an iterative process, and is aptly named iterative MUD (IMUD). The success of IMUD is measured by how close it can get to the performance of the computationally prohibitive optimum technique (joint maximum likelihood MUD) with as little complexity as possible. To do this, IMUD was compared to existing MUDs in terms of complexity and performance. Since MMSE V-BLAST was seen as the best low complexity competitor, it is used as a performance reference.; The results from IMUD with equal numbers of users and receivers were excellent. In a 12 user/12 receiver system at an error rate of 10-3 , IMUD had a 2dB gain on MMSE V-BLAST and roughly equal complexity. In the case when there are more users than receivers, IMUD's gains are even more pronounced. In a 12 user/8 receiver flat fading system at an error rate of 10-3, IMUD had a 7dB gain on MMSE V-BLAST with roughly equal complexity. IMUD was also tested in a serially concatenated system in which all users employed convolutional codes. The results are promising. In a 6 user/4 receiver system at an error rate of 10-3, the IMUD/SISO detector performs within 2dB of a single user coded system with the same number of antennas. With a rate 2/3 code, IMUD/SISO performs within less than 2dB of a single user coded system.
机译：本文研究了一种新型的迭代软输入/软输出分组多用户检测器（MUD）的性能。通常，多用户检测器通过在同时检测所有用户时明确考虑干扰来提高性能。在本文中，假设干扰是其信道增益已知的用户的产物。该新技术通过迭代过程扩展了组检测器MUD，并被适当地命名为迭代MUD（IMUD）。 IMUD的成功程度是通过它能以尽可能少的复杂性接近计算禁止的最佳技术（联合最大似然MUD）的性能来衡量的。为此，在复杂性和性能方面，将IMUD与现有MUD进行了比较。由于MMSE V-BLAST被视为最佳的低复杂度竞争对手，因此它被用作性能参考。 IMUD在用户和接收者数量相等的情况下的结果非常好。在错误率为10-3的12用户/ 12接收器系统中，IMUD在MMSE V-BLAST上具有2dB的增益，并且复杂度大致相等。在用户多于接收者的情况下，IMUD的收益更加明显。在错误率为10-3的12用户/ 8接收机平坦衰落系统中，IMUD在MMSE V-BLAST上的增益为7dB，复杂度大致相等。 IMUD也已在所有用​​户都使用卷积码的串行级联系统中进行了测试。结果令人鼓舞。在错误率为10-3的6用户/ 4接收器系统中，IMUD / SISO检测器在具有相同数量天线的单个用户编码系统中的性能在2dB之内。使用2/3码率，IMUD / SISO在单个用户编码系统中的性能不到2dB。

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