I'm out of the wireless game at this point, so this is all opinion: I also would have been ecstatic with a gain like going from 3x to 6x, but your result sounds pretty reasonable. Whatever signal processing is done for interference "cancellation", it has to do that processing on every received frame, and complete it within so many microseconds before the frame is too delayed to be useful, and it has to it with a size, cost, and power consumption that the market will bear. The WISP market won't bear much cost increase.
Around 2014-2015 when we were messing with Telrad LTE I was talking to the company president about the cost, which was north of $10k per eNB once you counted everything in the BOM. His point was that he didn't want to spend more than needed, but the one time capital expense of the base station wasn't a big deal in the long run when stacked up against everything else. Telrad sucked, but that's not the point. The point is another $2k per AP is not crazy for a marginal improvement as long as it's at least sometimes useful and you have the capital to start with. I'm afraid I got out before we had any 450m deployed so I don't know how significant an additional 1.0 uplink multiplexing gain is. If it was downlink I'd take any scraps of capacity I could get, but yeah maybe not so awesome on uplink. -Adam From: AF <af-boun...@af.afmug.com> On Behalf Of Ken Hohhof Sent: Thursday, February 01, 2024 12:00 PM To: af@af.afmug.com Subject: Re: [AFMUG] Cambium 450m uplink interference cancellation feature I think you know the answer, it's $2000 per AP. $2500 MSRP. I'd pay it if 3x and 4x modulations were suddenly 6x or 8x. But they're not. ---- Original Message ---- From: "Craig Schmaderer" Sent: 2/1/2024 10:40:30 AM To: "AnimalFarm Microwave Users Group" Subject: Re: [AFMUG] Cambium 450m uplink interference cancellation feature $2000??? Please tell me that is not per Access Point? I could handle maybe that for all of them. From: AF < <mailto:af-boun...@af.afmug.com> af-boun...@af.afmug.com> On Behalf Of Ken Hohhof Sent: Thursday, February 1, 2024 9:58 AM To: 'AnimalFarm Microwave Users Group' < <mailto:af@af.afmug.com> af@af.afmug.com> Subject: Re: [AFMUG] Cambium 450m uplink interference cancellation feature This sector has a lot of long links, subs clustered in the middle of the sector, and several Ubiquiti WISPs in the same direction. So the uplink modulation is poorer than downlink. The SMs have narrow beams but the AP sees 90 degrees. The other case where we get uplink problems is in 3 GHz when Verizon lights up CBRS on a celltower, but we can (mostly) solve that by matching LTE timing. From: AF < <mailto:af-boun...@af.afmug.com> af-boun...@af.afmug.com> On Behalf Of castarritt Sent: Thursday, February 1, 2024 9:33 AM To: AnimalFarm Microwave Users Group < <mailto:af@af.afmug.com> af@af.afmug.com> Subject: Re: [AFMUG] Cambium 450m uplink interference cancellation feature I haven't seen a 450M sector get bad uplink modulation rates without downlink getting trashed too unless it was caused by a misconfig on our end causing self interference. On Thu, Feb 1, 2024 at 9:26?AM Ken Hohhof < <mailto:khoh...@kwom.com> khoh...@kwom.com> wrote: Has anyone else tried the interference cancellation feature in 22.2 FW? (Free 30 day trial but license key is $2000.) I tried it on what I thought was an ideal candidate sector, but my first impression is that it helps a little not a ton. My uplink multiplexing gain was 1.0 so I figured I had nothing to lose. -- AF mailing list <mailto:AF@af.afmug.com> AF@af.afmug.com <http://af.afmug.com/mailman/listinfo/af_af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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