The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 08, 2000
Filed:
Sep. 10, 1998
Peter A Hamilton, London, GB;
Spacecode LLC, Monmouth, OR (US);
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.