can you help me...

hi..all

i am new to this forum....i would be glad if anyone could help me with the topic about DSSS(direct sequence spread spectrum) and OFDM(orthogonal frequency division multiplexing).....i jst came across these terms in these wireless LAN topologies..

tj

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Comments

ubergeek

DSSS OFDM... WTF?? are those military codes?

lol.. anyway just kiddin.. so what do you have in mind for those 2 topics? It's not really my forte but I got a lil info here at my sleeves.

mikej412

tj123 wrote:

i would be glad if anyone could help me with the topic about DSSS(direct sequence spread spectrum) and OFDM(orthogonal frequency division multiplexing).....i jst came across these terms in these wireless LAN topologies.

DSSS is one of the initial 802.11 standards for the 2.4Ghz band and operated at 2Mbps -- obsolete

but might still attach to an 802.11b Access Point.

OFDM is used by 802.16a -- high speed high capacity non-line-of-site wireless broadband.

kplab

You may find this webpage useful:

http://en.wikipedia.org/wiki/802.11

tj123

hai...

thanx for ur replies....i just get still very much cnfusd with these wireless netwrks..

tj

Opi

mikej412 wrote:

tj123 wrote:

i would be glad if anyone could help me with the topic about DSSS(direct sequence spread spectrum) and OFDM(orthogonal frequency division multiplexing).....i jst came across these terms in these wireless LAN topologies.

DSSS is one of the initial 802.11 standards for the 2.4Ghz band and operated at 2Mbps -- obsolete but might still attach to an 802.11b Access Point.

OFDM is used by 802.16a -- high speed high capacity non-line-of-site wireless broadband.

Correct me if i'm wrong

DSSS is still used with 802.11b , speed at 11Mbps with fallback of 5.5, 2 Mbps

And OFDM used with 802.11G, speed at 54Mbps

Then you have FHSS, speed at 2Mbps, so slow because it keeps hopping frequencies