Noise analysis and filter requirements in digital communications
Abstract
On the example of a general digital communications system, the paper identifies the major noise sources, calculates the noise levels, and determines the requirements on the filters. Noise sources considered are the analog-digital and digital-analog converter noise, filter errors, aliasing effect, channel error, and source errors. The results are summarized in several graphs from which an easily implemented design procedure can be done. These graphs are used in an example, in which digital word size required converter accuracy, and type of filter needed to yield a final signal-to-noise ratio no less than 40 dB are determined for a digital communication system using BPSK modulation with given bandwidth and given quantization rate.
- Publication:
-
11th International Conference on Communications, Volume 1
- Pub Date:
- 1975
- Bibcode:
- 1975comm....1....3H
- Keywords:
-
- Data Transmission;
- Digital Filters;
- Noise Generators;
- Signal Processing;
- Signal To Noise Ratios;
- Analog To Digital Converters;
- Digital Systems;
- Digital To Analog Converters;
- Noise Intensity;
- Phase Shift Keying;
- Pulse Communication;
- Communications and Radar