[LINK] Work on Next Generation Wireless in Canberra

[Richard Chirgwin]

On 23/11/10 10:05 AM, Stilgherrian wrote:
> On 23/11/2010, at 9:51 AM, Richard Chirgwin wrote:
>> If we're talking consumer level, you can choose between WiMAX (eg Vivid
>> Wireless) or various proprietary technologies.
>>
>> If you can run 1:1 - an unshared point-to-point link - then you can get
>> good speeds at a cost. Otherwise, you will have the same provisioning
>> question as you have with mobile - how many users can one base station
>> serve?
>>
>> A fixed 1:1 solution will outperform a shared mobile solution, but at a
>> cost penalty.
> And a run-out-of-frequencies penalty? Or do point-to-point fixed wireless links use such narrow beams that you can re-use frequencies in closely-adjacent locations?
>
> [Is that a tautology? Can something be both adjacent but further away?]
>
> Stil
>
>
Let's see. It's a problem at the receiving end more than the 
transmitting end - it's perfectly feasible that what starts out in a 
nice little Yagi antenna is a 100-metre-wide beam at the other end!

However, if your distances are not too great, then yes, you can use 
moderately close frequency spacing for a 1:1 antenna-to-antenna 
installation.

If you're using class-licensed equipment (AFAIK) then interference 
management is your own lookout (noting of course that if you habitually 
interfere with other people, you still have a problem).

RC