IEEE802.11b bandwidth

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mhamed

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Hi
As you know IEEE802.11b uses DSSS for its phy level. It uses 11-chip barker code. for 5.5Mbps mode, the modulation is BPSK. it means that without DSSS, it needs 5.5MHz bandwidth. using 11-chip Barker code increase the frequency to around 60.5MHz. but the bandwidth of the IEEE802.11b is 11Mhz (in baseband and 22MHz in RF frequency)!!! why?
 

I know it is a wireless protocol. In fact I am going to develop it by GNU Radio.. For sampling the received signal I need to know its real bandwidth. If it bandwidth is 11MHz, sampling rate should be 22MHz. on the other hand, 60.5 MHz, I need to sample data using 121MHz clock which is very high.
 

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