By James Tsui
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Extra resources for Digital Techniques for Wideband Receivers, 2nd Edition
Even if these approaches are theoretically viable, they must be implemented in real time. 12 CHANNEUZED RECEIVERS [42-55] The idea of a channelized receiver is very simple, and it uses a filter bank to sort signals with different frequencies. Amplifiers are used after the filter outputs to improve the receiver sensitivity. These amplifiers placed after the filter bank can improve sensitivity without affecting the dynamic range. Since at most one signal appears in one channel after the filter bank, intermodulation (often referred to as intermod) is not a problem.
Digital signal processing is then used to produce the desired PDW. A digital receiver does not have a crystal video detector. The output from the ADC is digital. Some of the major advantages are related to digital signal processing. Once a signal is digitized, the following processing will all be digital. Digital signal processing is more robust because there is no temperature drifting, gain variation, or dc level shifting as in analog circuits. Therefore, less calibration is required. The frequency resolution can be very fine if high-resolution spectrum estimation techniques can be applied.
The common approach is to measure the TOA difference (ATOA). 11. Throughput rate: The throughput rate is the maximum number of pulses that can be processed by the receiver per unit time. 12. Shadow time: This is the minimum time between the trailing edge of one pulse and the leading edge of the next that permits the receiver to properly encode both of them. This quantity is usually PW-dependent and it is defined here at the minimum PW. 13. Latency time: This is the delay between the arrival time of the pulse at the receiver and the output of the digital word from the receiver.
Digital Techniques for Wideband Receivers, 2nd Edition by James Tsui