Carrier frequency offset correction for uplink multi-user MIMO for next generation Wi-Fi

Shah, Nissar Ahmad; Ghosh, Monisha; Xia, Pengfei; You, Zihao; Sita, Frank La; Olesen, Robert L.; Oteri, O.

doi:10.1109/iccnc.2015.7069484

Cited by 8 publications

(9 citation statements)

References 4 publications

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“…57]. Figures 6a and 6b show the SNR as function of SNR in dB for MCS3 (16-QAM) and MCS7 (64-QAM), respectively, where the TGac B [1,8,6,1] UL MU-MIMO channel is assumed. Analyzing the Fig.…”

Section: Asynchronous Tgac B Ul Mu-mimo Channelmentioning

confidence: 99%

“…58]. Figure 7 shows the PER as function of SNR in dB for MCS3 , where the TGac D [1,8,6,1] UL MU-MIMO channel is simulated. First, we can see that the system performance is completely degraded when the channel delay Δ< is set to 400 ns.…”

Section: Asynchronous Tgac D Ul Mu-mimo Channelmentioning

confidence: 99%

“…In [5] we show that a frequency domain CFO estimation scheme has a superior performance in relation to the time domain CFO estimation algorithm in the context of 802.11ax UL MU-MIMO PHY. The reference [5] aims at complementing the references [6] (where a three-stage CFO mitigation scheme was proposed) and [7] (where it was shown that the performance of the clients without CFO is not impaired due to the residual CFO that impinges the other clients).…”

Section: Introductionmentioning

confidence: 99%

“…Interrelations between the asynchronous reception and synchronization delay on the MPDU PER as a function of SNR in dB:[1,8,1,6] canonical UL MU-MIMO channel; BW=80 MHz; MU-MMSE receiver with perfect CSI; MPDU payload of 1500 bytes; soft-decision Viterbi decoding.…”

mentioning

confidence: 99%

“…Received constellation of 64-QAM symbols at MU-MMSE MIMO detector output when the symbols are transmitted over the[1,8,6,1] canonical UL MU-MIMO channel with a SNR of 32 dB, channel delay Δ< of 400 ns and synchronization delay Δ of 450 ns: (a) constellation of one delayed client when the synchronization occurs at the time arriving of the delayed clients (cf.…”

mentioning

confidence: 99%

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IEEE 802.11ax: On Time Synchronization in Asynchronous OFDM Uplink Multi-User MIMO Physical Layer

Hoefel¹

2017

Anais De XXXV Simpósio Brasileiro De Telecomunicações E Processamento De Sinais

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The High Efficiency WLANs (HEW) Task Group (TG) has been developing since 2014 the IEEE 802.11ax amendment, the 6 th generation of wireless local area networks (WLANs). One major novel feature of IEEE 802.11ax standard is the specification of uplink multiuser multiple-input multiple-output (UL MU-MIMO) techniques to cope with the increase of UL data/video traffic from small-form devices in ultra-dense networks. In this paper, we first show that the UL MU-MIMO physical layer performance can be dramatically impaired due to the asynchronous reception over the uplink channel. Next, we propose and evaluate the performance of a time advance mechanism designed for IEEE 802.11ax WLANs that mitigates adequately the performance loss due to asynchronous UL MU-MIMO channels.

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Section: Asynchronous Tgac B Ul Mu-mimo Channelmentioning

confidence: 99%

Section: Asynchronous Tgac D Ul Mu-mimo Channelmentioning

confidence: 99%