Nonlinear CDMA Satellite Receiver: System Design and Analysis
碩士 === 國立交通大學 === 電信工程系 === 87 === In order to attain maximum output power, the high power amplifie (HPA) on board a satellite usually operates near the saturation point. It is well-known that the nonlinear characteristic of an HPA will induce the so-called AM/AM and...
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| Format: | Others |
| Language: | en_US |
| Published: |
1999
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| Online Access: | http://ndltd.ncl.edu.tw/handle/48072951675550832634 |
| Summary: | 碩士 === 國立交通大學 === 電信工程系 === 87 === In order to attain maximum output power, the high power amplifie (HPA) on board a satellite usually
operates near the saturation point. It is well-known that the nonlinear characteristic of an HPA will induce
the so-called AM/AM and AM/PM effects. AM/PM introduces nonlinear phase rotation that is especially
harmful to phase-modulated signals. The "satellite channel" between the input of the uplink transmitter filter
and the transponder output constitutes a nonlinear channel with memory that must be dealt with by the
downlink receiver.
This thesis intends to provide receiver solutions for the following three operation scenarios:
(i) single BPSK/QPSK user,
(ii) multiple BPSK/QPSK-modulated direct sequence spread spectrum (DS/SS) users,
(iii) multiple BPSK/QPSK DS/SS users in the presence of narrow-band interference(NBI).
We use a Volterra model to identify the above-mentioned nonlinear channel and analyze
the impacts of such nonlinear distortions on the performances of various receiver structures.
We also analyzed and simulated the corresponding mean-squared error (MSE) and bit error
probability (BEP) performances.
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