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RAKE receiver in 802.11b (Channel Estimation)

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addunw

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Hi

I am trying to figure out if channel estimation and coherent demodulation is used in 802.11b receiver. I understand that 802.11b uses CCK coding with DBPSK or DQPSK for 5.5 and 11Mbps rates. But I am not able to figure out if Channel estimation and coherent demodulation is done at the receiver, and if it is done then how is it implemented.

Any help would be appreciated.

Thanks
 

I have see some information here. Hopefully helpful.

**broken link removed**
 

The material was helpful.

But I am still confused if coherent detection/demodulation is done at the receiver in 802.11b. Since 802.11b uses Differential QPSK and BPSK which does not require coherent detection (Maybe I am wrong about this). A lot of texts say that 802.11b uses coherent detection. I just want to know the reason for using coherent detection in 802.11b.

Thanks
 

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