IEEE 802.11ac下行链路用户复用方案的性能比较:多用户MIMO与帧聚合

Jiyoung Cha, Hu Jin, B. Jung, D. Sung
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引用次数: 38

摘要

IEEE 802.11ac标准新采用了下行链路多用户多输入多输出(DL-MU-MIMO)方案。对于下行链路WLAN的用户复用,我们也可以使用帧聚合方案对多个用户的数据进行空时分组编码(STBC)复用,以实现空间分集。我们比较了两种下行链路用户复用方案的性能:IEEE 802.11ac中的多用户MIMO和帧聚合。如果每个用户编码的数据流具有相似的长度,则多用户MIMO方案比帧聚合方案产生更好的平均吞吐量。另一方面,如果每个用户编码的数据流具有不同的长度,则帧聚合方案在平均吞吐量方面优于多用户MIMO方案。在快速变化的信道中,与帧聚合方案相比,多用户MIMO方案由于信道反馈开销而产生更差的吞吐量。我们还观察到,由于通过帧聚合提高了MAC层效率,因此带有STBC的多用户帧聚合方案在平均吞吐量方面总是优于带有STBC的单用户传输方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Performance comparison of downlink user multiplexing schemes in IEEE 802.11ac: Multi-user MIMO vs. frame aggregation
IEEE 802.11ac standard has newly adopted a downlink multi-user multiple-input and multiple-output (DL-MU-MIMO) scheme. For user multiplexing in downlink WLAN, we can also use a frame aggregation scheme for multiplexing multiple users' data with space-time block coding (STBC) for achieving spatial diversity. We compare the performance of the two downlink user multiplexing schemes: multi-user MIMO and frame aggregation in IEEE 802.11ac. If each user's encoded data stream has a similar length, the multi-user MIMO scheme yields better average throughput than the frame aggregation scheme. On the other hand, if each user's encoded data stream has a different length, the frame aggregation scheme outperforms the multi-user MIMO scheme in terms of average throughput. In a fast-varying channel, the multi-user MIMO scheme yields worse throughput due to the channel feedback overhead, compared to that with the frame aggregation scheme. We also observe that the multi-user frame aggregation scheme with STBC always outperforms a single-user transmission scheme with STBC in terms of average throughput due to enhanced MAC layer efficiency through frame aggregation.
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