Jim Thompson wrote:
> On Apr 15, 2004, at 6:53 PM, [EMAIL PROTECTED] wrote:
>
> > Many Wi-Fi companies employ diversity in their receivers.
>
> none do per-packet diversity in the OFDM modes. e.g. "show me".
Who said they did "per-packet diversity"in the OFDM" ?
However, the SureFyre 802.11a uses "per-packet diversity".
***************************************************************
Key features of the SureFyre 802.11a system solution include:
<SNIP>
Per packet antenna diversity selection delivers up to 10 dB gain in
sensitivity
in multipath environments;
********************************************************************
e.g. You have been shown............
>
>
> > Co-Phasing alone?
> >
> > * How would you cancel the phase distortion?
>
> For 802.11? I wouldn't.
>From Microwave & RF Design Mag-For Designers At A Higher Frequency
Modeling 802.11a-Based WLAN Systems
<SNIP>
OFDM offers potential for high-data-rate transmission, it also requires
additional signal processing for synchronization and other auxiliary
receiver(Rx) functions. Some disadvantages of OFDM include
susceptibility to oscillator phase noise and sensitivity to transmission
amplitude/phase distortion.
>
>
> > * How would you deal with avoidance separation?
>
> distributed CCA.
CCA has nothing to do with "avoidance separation"....
>
>
> > Simply "Co-phasing" antennas does equate to a smart antenna.
>
> I didn't say it did. I (basically) said that you had the beginnings
> of
> a smart antenna system. e.g. "You're into smart antenna land."
>
> > Smart antennas employ beam forming, beam switching and selection
> > diversity.
> > Diversity is a system which employs co-phasing as well other
> > techniques.
>
> Well, there is no "co-phasing" in switched diversity, which is what
> you
> were describing.
No, I said........ "Diversity is a system which employs co-phasing as
well other techniques."
The two sentences were two separate descriptions
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