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Statistics that are obtained from the demodulator are used in a direct-sequence spread-spectrum receiver to provide an estimate of the signal-to-noise ratio. We evaluate the applicability to spread-spectrum multiple-access systems of an SNR estimator that was proposed previously for SNR estimation in systems for which the only disturbance is thermal noise. The proposed estimate does not require the...
Results are presented on code performance and capacity bounds for channels with Gaussian, bi-level, block interference for binary and nonbinary modulation, noncoherent demodulation, and soft-decision decoding. Each transmitted block is corrupted by additive white Gaussian noise that has one of two power spectral densities. The smaller of the two is the power spectral density of the thermal noise,...
Two classes of complementary signal sets are compared in terms of their complementary properties and their error probabilities for channels with thermal noise and multipath interference. One class consists of the high-rate (11 Mbps and 5.5 Mbps) signals employed in the IEEE 802.11b standard, and the other class includes full-rate (11 Mbps) complex signals derived from biorthogonal sequences and half-rate...
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