An implementation of an AMPS digital base station with adaptive Automatic Gain Control
<p>We consider the problem of designing a wide-band digital receiver for an Advanced Mobile Phone Service (AMPS) cellular system, and the associated problem of choosing an appropriate Analog-to-Digital (ADC) converter. The probability density function of the voltage across a cellular receiv...
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| Format: | Others |
| Language: | en |
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Virginia Tech
2014
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| Online Access: | http://hdl.handle.net/10919/44503 http://scholar.lib.vt.edu/theses/available/etd-08292008-063555/ |
| Summary: | <p>We consider the problem of designing a wide-band digital receiver for an Advanced
Mobile Phone Service (AMPS) cellular system, and the associated problem of choosing an
appropriate Analog-to-Digital (ADC) converter. The probability density function of the
voltage across a cellular receiving antenna is shown to be dependent on various cellular
parameters. These parameters include mobile transmit power, mobile distance from the base
station, mobile transmit frequency, and transmitting and receiving antenna characteristics.
Given a high-resolution, wideband, uniform and symmetric quantizer, optimal gain factors are
computed for uniformly-, sinusoidally- and normally-distributed input signals. These gain
factors maximize the quantizer's Signal-to-Quantization Noise Ratio (SQNR) in a meansquare
sense. Together, these techniques can be used to implement an adaptive Automatic
Gain Control for cellular communications. Results from a comprehensive AMPS base station
simulation will also be discussed in detail. These results illustrate several design tradeoff's
including Signal-to-Noise Ratio (SNR), Carrier-to-Noise Ratio (CNR), system loading and
quantizer resolution. === Master of Science |
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