Diversity Combining for Frequency-Hop Spread-Spectrum Communications with Partial-Band Interference and Fading.
ILLINOIS UNIV AT URBANA COORDINATED SCIENCE LAB
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This report presents results on the evaluation of several diversity combining techniques that are suggested for frequency-hop FH communications with partial-band interference and fading. The analysis covers systems with M-ary orthogonal signaling and noncoherent demodulation. The partial-band interference is modeled as a Gaussian process, although some of the results also apply to general non-Gaussian partial-band interference. The performance measures we use to evaluate the diversity combining techniques are the narrowband interference rejection capability and the signal to noise ratio requirement over the entire range of interference duty factors. We evaluate the exact probability of error for each of the diversity combining techniques studied. The performance of the optimum combining technique for receivers with perfect side information is established. It is shown that for receivers with perfect side information, the system performance does not change significantly with the choice of the diversity combining technique. However, the same schemes that work well in receivers with perfect side information perform poorly in receivers without side information. Keywords include Diversity combining Frequency-hop Spread-spectrum Partial band interference and Fading.
- Radiofrequency Wave Propagation
- Radio Communications