Hi,
I am dealing with a UMTS uplink receiver implementation with USRP N210. I
have some general questions that I hope that someone can answer:
1) Is it completely necessary to implement a rake receiver? I have been
reading quite a lot about it, and it seems extremely complex because it
needs channel estimation, and this means to process the received signals in
real time (which is not my purpose). Moreover, in the uplink there is no
pilot channel like the CPICH in the downlink. The Rake receiver improves the
SNR of the signal by combining the multipath effects, but I wonder if the
reception of the signal would be too bad if the Rake receiver is not
implemented.
2) My idea is not to use the Rake receiver, because of its complexity. The
SDR blocks that I have on mind for the receiver are, in a general sketch::
Root Raised Cosine filter---QPSK DEMODULATOR------
-De-scrambling--------------------------De-spreading( correlating with the
output of a OSVF code generator)
(correlating with the
output of a scrambling code generator)
What do you think?any ideas?
Best regards,
Miguel
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