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Talk:Orthogonal frequency-division multiple access

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This is an old revision of this page, as edited by Mange01 (talk | contribs) at 15:29, 1 June 2010 (→Cell breathing). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
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This is perhaps the lowest quality page I've seen on Wikipedia in some time. It obviously needs to be completely cleaned up. user:209.166.211.66 02:17, 17 August 2005

I have rewritten it. Some illustrations would help. Mange01 13:11, 15 November 2006 (UTC)[reply]

Different reader: I would be interested in understanding how OFDMA actually works. A graphic would be nice too. user:212.117.152.156 14:22, 15 November 2006

Perhaps the OFDM explains it all? But that article would also need some illustrations. Mange01 13:11, 15 November 2006 (UTC)[reply]

For SOFDMA page is redirected to here. But it's not mentioned at all!!! —Preceding unsigned comment added by Damithad (talk • contribs) 14:44, 8 October 2007 (UTC)[reply]

Cell breathing

Per the clarification request; no I don't think OFDMA suffers from cell breathing. In a CDMA system, cell breathing is caused by an increased interference floor as more users start transmitting, so the cell radius decreases. In OFDMA, the users are orthogonal, so the intra-cell interference is constant. Oli Filth(talk|contribs) 14:46, 1 June 2010 (UTC)[reply]

Hi Oli. CDMA does not "suffer" from cell-breathing - it is an advantage of CDMA. To my understanding, it is a traffic-adaptive behaviour, making it possible for CDMA cells to easily borrow resources from each other, for example if the traffic load is higher near one basestation than near adjacent basestations.
In 1G and 2G systems, you also had a simple form of cell breathing, based on traffic-adaptive handover thresholds. A cell with low load may grow and attract traffic from the overlap area of adjacent overloaded cells.
OFDMA may be combined with dynamic channel allocation, and then cells can borrow resources from each other in a similar fashion, resulting in a form of cell breathing. Am I right?
Should we remove cell breathing from the list of OFDMA advantages? Mange01 (talk) 15:29, 1 June 2010 (UTC)[reply]
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