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Range Enhancement in Radio Communication

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carpediem.td

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Hi friends,
I need some papers on the techniques for increasing the range in radio communication(long range). The constraint my professor has put is that I can't change power levels and the antennas. Rather, I need to focus on techniques to increase the range related to the follwing:

1. NBDS(Narrowband Direct Sequence) Spread Spectrum.
2.Channel Estimation techniques
3.Rake Receivers

Please give me some pointers and suggest some journal papers that deal with range enhancement.
 

jallem

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To increase the range without changing the transmit power level or
the antenna characteristics, you should see what affect the
link budget. What is left to you to change is:
a) decrease the sensitivity of the receiver,
b) decrease de losses in the transmission and the
receiving site
c) change the channel,
d) lower the speed of transmission if digital.
 

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