LDPC Codes Performance Evaluation for IEEE 802.11-22 Standard Extension

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Explore the performance of longer LDPC codes in the context of extending the codeword block length in the IEEE 802.11-22 standard. The study includes simulation results, channel configurations, and considerations for robust channel coding schemes. Authors from NXP share insights on the benefits and implications of utilizing longer LDPC codes for ultra-high reliability WiFi communication.

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July 2024 doc.: IEEE 802.11-22/0xxxr0 2x1944 LDPC Codes Performance Evaluation Date: 2024-July Authors: Name Affiliations Address Phone email NXP Rong Zhang 350 Holger Way, San Jose, CA 95134 rong.zhang_1@nxp.com Rui Cao rui.cao_2@nxp.com Hari Ram Balakrishnan Sudhir Srinivasa hariram.balakrishnan@nxp.co m sudhir.srinivasa@nxp.com Hongyuan Zhang hongyuan.zhang@nxp.com Submission Slide 1 Rong Zhang, etc (NXP)

July 2024 doc.: IEEE 802.11-22/0xxxr0 Background The next generation WiFi is defined for ultra high reliability. This motivates more robust channel coding schemes. It is known that the performance of LDPC codes improves for longer codeword block length. Currently, the longest codeword block length is 1944 bits. Contribution 11-24/1985r4 [1] proposed to extend the codeword block length to 2x1944 bits. In their design, considerations are emphasized on reusing existing LDPC core for codeword block length of 1944 bits. In this study, we show simulation results of those longer LDPC codes under various settings. We also share our views on longer LDPC codes. Submission Slide 2 Rong Zhang, etc (NXP)

July 2024 doc.: IEEE 802.11-22/0xxxr0 Sim Configs Antenna (Nt x Nr x Nss): 4x2x1, 2x2x1, 4x2x2, 2x2x2, 1x1x1 Channel: DNLOS, BLOS, AWGN (only 1x1x1) PPDU: EHT SU 80MHz MCS: 0:1:13 Tx BF: On and Off Channel estimation: realistic Equalizer: linear LDPC decoder: min-sum, max 30 iterations Packet size varied to budget adequate number of codewords and symbols Statistics: 1000 channels and 10% PER sensitivity is linear interpolated from two adjacent data points with 0.5dB SNR gap (0.2dB SNR gap in AWGN) Submission Slide 3 Rong Zhang, etc (NXP)

July 2024 doc.: IEEE 802.11-22/0xxxr0 Nt=4 Nr=2 Nss=1 Gain [0.2 ~ 0.5] dB across all MCSs for both channels with/without BF Submission Slide 4 Rong Zhang, etc (NXP)

July 2024 doc.: IEEE 802.11-22/0xxxr0 Nt=2 Nr=2 Nss=1 Gain [0.2 ~ 0.5] dB across all MCSs for both channels with/without BF Submission Slide 5 Rong Zhang, etc (NXP)

July 2024 doc.: IEEE 802.11-22/0xxxr0 Nt=4 Nr=2 Nss=2 Gain [0.2 ~ 1] dB across all MCSs for both channels with/without BF Submission Slide 6 Rong Zhang, etc (NXP)

July 2024 doc.: IEEE 802.11-22/0xxxr0 Nt=2 Nr=2 Nss=2 Gain [0.2 ~ 1] dB across all MCSs for both channels with/without BF Submission Slide 7 Rong Zhang, etc (NXP)

July 2024 doc.: IEEE 802.11-22/0xxxr0 Nt=1 Nr=1 Nss=1 Gain [0.2 ~ 0.5] dB across all MCSs Submission Slide 8 Rong Zhang, etc (NXP)

July 2024 doc.: IEEE 802.11-22/0xxxr0 Summary Simulations are carried out for longer LDPC codes. Consistent gains can be observed across all MCSs in various settings. Affordable HW development efforts, since the code structure allows reusing existing LDPC core for codeword block length of 1944 bits. Hence, the adoption of longer LDPC codes [1] needs to be considered by 11bn. Submission Slide 9 Rong Zhang, etc (NXP)