Dear All,
This mail is a followup to yesterday's conference
call:
In order to help us in evaulating the performance of
the existing preamble and compare it against any changes, we would like to
know the simulation scenarion that needs to be assumed (eg. a 19 cell model) and the procedure for
the initial acquisition (after power on of mobile).
Specifically, we want to know whether one can assume
that initial symbol timing acquisition is done using CP correlation of the
OFDM symbols and that the preamble is used only for Frame timing. If this is a
valid assumption, has any one run any simulations using the CP technique to
measure its reliability? If so can they share their results with the group?
In case the CP base symbol timing is not reliable, we
have to perform a time correlation against the preamble sequence itself for
initial symbol timing acquisition – in this case, we are concerned with the
correlator complexity which could be potentially large as we have to do these
correlation operations per ADC output sample. So, in this case we would like
to suggest that we look at alternative preamble structures and sequences to
reduce the complexity (and in turn power consumption) of the mobile for
initial symbol timing acquisition.
Anand Dabak
Texas
Instruments