1 / 9

Proposal for 4-Bit CRC Implementation in SIG Fields

This presentation by Hongyuan Zhang et al. discusses the implementation of a 4-bit CRC for SIG fields in the 802.11ah framework. Current specifications utilize a combination of 4-bit and 8-bit CRCs across various SIGs, with the proposal to extract the 4 least significant bits from an 8-bit CRC to serve as the 4-bit CRC. Simulations indicate a significant reduction in false positive probabilities, enhancing performance in low signal-to-noise ratio (SNR) environments. The presentation seeks consensus on adopting this approach for multi-clock devices supporting different preamble lengths.

armando-osborn
Download Presentation

Proposal for 4-Bit CRC Implementation in SIG Fields

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SIG Field 4-Bit CRC Authors: Date: 2012-05-15 Hongyuan Zhang, et. Al.

  2. Authors continued: Hongyuan Zhang, et al Slide 2

  3. Authors continued: Hongyuan Zhang, et. Al.

  4. Abstract This presentation relates to the CRC used in SIG Fields. Hongyuan Zhang, et. Al.

  5. May 2012 • Current 11ah spec framework uses 4-bit CRC in 1MHz SIG and 2MHz SIG(A), and uses 8-bit CRC in 2MHz SIGB (long preamble). • Propose to use the 4 LSB of the 8-bit CRC as the 4-bit CRC in SIG fields. • Simulations show strong enough false positive probability compared with the SIG field decoding error rate (refer to next slide). • Easy for implementation for “multi-clock” devices, and for devices that support both short and long preambles. Overview Hongyuan Zhang, et. Al.

  6. 1MHz SIG Field, 6 symbols, modulated using MCS0-Rep2. 4-bit CRC uses 4 LSB of 8-bit CRC, similar scheme is applied for 6-bit CRC. CRC Simulation Hongyuan Zhang, et. Al.

  7. Results in the previous slide show that the false positive prob. of 1MHz SIG when using 4-bit CRC is approximately one magnitude lower than the error rate of 1MHz SIG field. False positive happens at such a low SNR where most likely packet detection and timing synchronization will fail anyway. Discussions Hongyuan Zhang, et. Al.

  8. Do you agree to use the 4 LSB of the 11n HTSIG field 8-bit CRC for the 4-bit CRC in 11ah 2MHz and 1MHz SIG(A) fields, and use the same 11n HTSIG field 8-bit CRC in SIGB field of the >=2MHz long preamble? Straw Poll-1 Hongyuan Zhang, et. Al.

  9. Move to use the 4 LSB of the 11n HTSIG field 8-bit CRC for the 4-bit CRC in 11ah 2MHz and 1MHz SIG(A) fields, and use the same 11n HTSIG field 8-bit CRC in SIGB field of the >=2MHz long preamble? Motion-1 Hongyuan Zhang, et. Al.

More Related