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256-QAM TX EVM and RX Sensitivity

256-QAM TX EVM and RX Sensitivity. Date: 2011-01-17. Authors:. TX EVM. TX EVM requirement ensures that the TX signal quality does not significantly limit the overall link performance Slope of PER curve consistent between different MCS No fading, 1x1, 80 MHz, 4096 bytes

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256-QAM TX EVM and RX Sensitivity

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  1. 256-QAM TX EVM and RX Sensitivity Date: 2011-01-17 Authors: Youhan Kim et al.

  2. TX EVM • TX EVM requirement ensures that the TX signal quality does not significantly limit the overall link performance • Slope of PER curve consistent between different MCS • No fading, 1x1, 80 MHz, 4096 bytes • To rule out PER impact from other impairments • No phase noise, no PA model • Perfect synchronization, channel estimation  Impact of TX EVM to PER should be more or less consistent between MCS • If TX EVM is chosen to be X dB more stringent than the overall RX sensitivity requirement for MCS Y, then reasonable to choose TX EVM to be X dB more stringent for MCS Z as well Youhan Kim et al.

  3. 11n – HT20 • Difference between TX EVM requirement and RX sensitivity requirement is mostly consistent across MCS • SNR assuming noise figure + implementation loss = 18 dB • To make SNR = 1 dB for BPSK ½ for consistency w/ next slide B A Avg. -6.3 Youhan Kim et al.

  4. TX EVM Requirement for 11ac • Previously increased 6 dB for every 4x in QAM order • If increased by 6 dB for 256-QAM as well, then EVM requirement becomes too stringent compared to other MCS A B 6 5.5 Avg. -6.0 6 5.6 6 5.5 5.8 6 * 1x1, 80 MHz, no analog impairments, perfect channel estimation Youhan Kim et al.

  5. TX EVM Requirement for 11ac • Propose -30/-32 dB for 256-QAM 3/4 and 5/6 • Difference between TX EVM requirement and RX sensitivity requirement is more consistent with other MCSs A B Avg. -6.0 * 1x1, 80 MHz, no analog impairments, perfect channel estimation Youhan Kim et al.

  6. RX Sensitivity • Simulation setup • TX: No phase noise, no PA model, 4096 bytes • RX: IEEE phase noise included, perfect synchronization/channel estimation • SNR obtained from 80 MHz simulation * Assuming noise figure + implementation loss = 18 dB Youhan Kim et al.

  7. Proposed RX Sensitivity Youhan Kim et al.

  8. Pre-Motion 1 • Do you support -30 dB and -32 dB as the TX EVM requirements for 256-QAM 3/4 and 5/6, respectively, and to edit the specification framework document (11-09/0992) accordingly? Youhan Kim et al.

  9. Pre-Motion 2 • Do you support receiver minimum sensitivity for 256-QAM ¾ and 5/6 as shown on slide 7 and to edit the specification framework document (11-09/0992) accordingly? Youhan Kim et al.

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