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In this work, for a CDMA communication, the per user
carrier-to-interference ratio (CINR) enhancement in the Reverse
Link (mobile to base station) is analyzed using different antenna
array spatial combining algorithms: Optimal Combining (OC) Versus
Maximal Ratio Combining (MRC) in a multi-rate (combined voice and
data users) multi-antenna scenario. The ratio of the CINR for OC
vs. MRC is directly analyzed, i.e. Z=CINROC/CINRMRC. Exact
solutions are derived for the statistics of a per user
CINROC/CINRMRC improvement, as a function of the high-level
interference power to background noise, the gain ratio
CINROC/CINRMRC is evaluated in a flat Rayleigh fading
communications system with multiple interferers, when the number of
interferences L is no less than the number of antenna elements M (L
M). The gain ratio is derived providing a simple means to determine
when OC will exhibit significant gains over MRC. simulations are
done to find out the BER performance of optimum combining diversity
in correlated Nakagami-m channels and compare with the BER
performance of MRC and the influence of interference for MRC and OC
are analyzed and discussed"
Wireless technology provides an array of applications viz wireless
phones, wireless Internet access &WLAN.These systems are prone
to performance degradation due to multipath fading, pol. mismatch
So Service, Quality, Security and Capacity are of primary
importance.To solve these space time processing is used, that is
signal processing performed on a system in both the spatial and
temporal dimensions of the radio cannel.These can be applied at the
Tx or Rx or both.At the Receiver MIMO techniques are used.Rx
Diversity schemes are MRC, EGC &SC.Of these MRC is considered
as it provides the maximum SNR at the output.In MRC the output
signal is the weighted sum of the input signals present at the
input of the array.In a practical combiner the channel can never be
estimated perfectly because of multipath fading. This results in
errors in channel estimation which effect the weighing factors of
the combiner.The performance of the MRC degrades w.r.t.output SNR
and BER. Here the effects of imperfect channel estimation resulting
in gaussian errors in the weights of MRC are studied.Performance of
MRC in different fading channels with imperfect channel estimates
& digital mod.tech. is analyzed.
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