Multi-symbol analysis for digital symbol determination

Details Multi-symbol analysis for digital symbol determination Multi-symbol analysis for digital symbol determination

1998-09-10

2000-08-08

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

H03M 112

Patent

active

061008354

ABSTRACT:
A multi-symbol analysis process compensates for inter-symbol interference in communication signals. The multi-symbol analysis process determines a digital value for a symbol represented by a selected symbol period by correlating a digitized sample within the selected symbol period with a sum of weighted signal components. The sum of weighted signal components includes contributions from the selected symbol period and symbols from a number of other symbol periods that occur before and after the selected symbol period. The multi-symbol analysis process allows more extensive digital filtering, which reduces the bandwidth required to achieve the signal to noise ratio necessary to determine correctly a digital symbol represented by an analog signal. As a result, the multi-symbol analysis process can markedly increase the capacity of communications channels, including satellite communication channels. In the course of the multi-symbol analysis process a quality factor is produced that can be related directly to the probability of error in that decision. This provides an efficient means of error correction with a minimum use of additional bandwidth.

REFERENCES:
patent: 5777892 (1998-06-01), Nabity et al.
patent: 6030345 (2000-02-01), Wang

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