AMP DL OOK Generation for IEEE 802.11-25/0440r0 Discussion
Delve into the detailed exploration of OOK generation for AMP DL within the IEEE 802.11-25/0440r0 document in March 2025. The advantages of DSSS OOK are highlighted, focusing on the requirements for the AMP DL control and excitation portions. The recap covers the utilization of Barker code in spreading information bits for a wideband DSSS signal, as well as strategies for generating narrow bandwidth DSSS signals through alternative spreading codes. Further considerations are presented regarding the proper bandwidth of the DL control portion in supporting regulatory requirements and maximizing power capabilities, with insights into utilizing guard bands for filtering implementation and considerations for long-range coverage support.
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March 2025 Doc.: IEEE 802.11-25/0440r0 Follow-up on AMP DL OOK generation Date: 2025-03-09 Authors: Name Affiliation Address Phone Email Wang Ke wangke6@oppo.com OPPO Shengjing Cui Wang Ke xuweijie@oppo.com Submission Slide 1 Wang Ke (OPPO)
Doc.: IEEE 802.11-25/0440r0 March 2025 Abstract In this contribution, the OOK generation for AMP DL will be further discussed. The advantage of DSSS OOK will be discussed while considering requirements for AMP DL control portion and AMP excitation portion. Submission Slide 2 Wang Ke (OPPO)
Doc.: IEEE 802.11-25/0440r0 March 2025 Recap:OOK generation with DSSS(1) In 802.11b, Barker code (1,-1,1,1,-1,+1,+1,+1,-1,-1,-1) is used to spread information bits to a wideband DSSS signal with 22MHz spectrum. 0 1 Information bits Barker Code DSSS signal Submission Slide 3 Wang Ke (OPPO)
Doc.: IEEE 802.11-25/0440r0 March 2025 Recap: OOK generation with DSSS(2) In order to generate a narrow bandwidth DSSS signal, one way is to replace Barker code with another spreading code. Less randomization than Barker code, one example is [1 1 1 1 -1 -1 -1 -1 -1 -1 -1] about 3 times spectrum spreading via About 4 times repetition of 1 or -1 The new output DSSS signal is OOK modulated (may has Manchester coding), as shown in the following. 1 0 Information bits Manchester Coding DSSS Spreading DSSS Spreading Code DSSS Spreading Code DSSS Spreading Code DSSS Spreading Code DSSS OOK DSSS_OOK_OFF DSSS_OOK_ON DSSS_OOK_ON DSSS_OOK_OFF Submission Slide 4 Wang Ke (OPPO)
Doc.: IEEE 802.11-25/0440r0 March 2025 Recap: OOK generation with DSSS(3) The new DSSS signal is OOK modulated, the BW of the output DSSS OOK = BW of DSSS + BW of OOK envelope. Submission Slide 5 Wang Ke (OPPO)
Doc.: IEEE 802.11-25/0440r0 March 2025 Further thoughts on OOK for AMP DL For the DL control portion, what the proper bandwidth of it? Considering the regulation requirement and the PSD limitation, it shall be no less than 10MHz in order to support a maximum power of 20dBm. On the other hand, shall it have guard band on both side in order to ease the possible filtering implementation? E.g. as for 11ba, the BW of WUR portion is 4MHz and it leaves guard band of 8 MHz on each side. For AMP, in order to support long range coverage, IF receiver may be utilized to improve the receiver sensitivity. In such case, it had better to have guard band. Submission Slide 6 Wang Ke (OPPO)
Doc.: IEEE 802.11-25/0440r0 March 2025 Further thoughts on OOK for AMP DL For the excitation portion, we see similar requirement of the BW Considering the regulation requirement and the PSD limitation, it shall be no less than 10MHz in order to support a maximum power of 20dBm. On the other hand, it shall have guard band on both side in order to avoid the power leakage from the backscattering signal to adjacent channel. e.g. if the BW of the excitation portion is 20MHz, an AMP UL PPDU of 250kbps modulated on top of it will have a bandwidth of (20+1) MHz . It will affect the neighboring node operating on the adjacent channel. Submission Slide 7 Wang Ke (OPPO)
Doc.: IEEE 802.11-25/0440r0 March 2025 Advantages of DSSS OOK We see at least the following advantage of DSSS OOK, Only baseband update is needed, no new hardware requirement Flexible to generate OOK signal with required bandwidth by using proper spreading code[1][2][3] Flexible to support different data rates, i.e., 250kbps and 1Mbps Can be applied for both AMP DL control and excitation portion Low PAPR, better performance than OFDM OOK Submission Slide 8 Wang Ke (OPPO)
March 2025 Doc.: IEEE 802.11-25/0440r0 Summary In this submission, further thoughts on OOK for AMP DL is discussed and the advantages of DSSS OOK are analyzed. We propose DSSS based OOK is supported as one candidate waveform for AMP DL. It will be up to implementation to select which kind of waveform to use, i.e. DSSS-OOK or OFDM-OOK. Submission Slide 9 Wang Ke (OPPO)
March 2025 Doc.: IEEE 802.11-25/0440r0 Straw Poll #1 Do you agree with the following text: DSSS based OOK is supported for AMP DL. Yes No Abstain Submission Slide 10 Wang ke (OPPO)
March 2025 Doc.: IEEE 802.11-25/0440r0 Reference 1. IEEE 802.11-24/1802r0 OOK generation for AMP DL 2. IEEE 802.11-25/0050r0AMP DL wideband OOK generation. 3. IEEE 802.11-25/0075r2 Further Thoughts on AMP DL PPDU for Mono- static Backscattering Submission Slide 11 Wang Ke (OPPO)
