Title:
EFFICIENT METHODS FOR FILTERING TO AVOID INTER-SYMBOL INTERFERENCE AND PROCESSING DIGITAL SIGNALS HAVING LARGE FREQUENCY GUARD BANDS
Document Type and Number:
WIPO Patent Application WO2003028327
Kind Code:
A3
Abstract:
A circular filtering system which prevents the problem of inter-symbol interference. The circular filtering system utilizes a buffer memory to store samples of a given symbol and provide only these samples to a linear filter such that the output of the filter, for any given symbol is formed by filtering only samples of that input symbol. Each symbol is filtered independent of other symbols hence eliminating inter-symbol interference caused by filtering. Where symbols are tolerant to a fixed phase shift for each symbol, the circular filtering system can be simplified by reducing the size of the buffer and introducing a multiplexer.
Inventors:
BAAS BEVAN M
GILBERT JEFFREY M
MCFARLAND WILLIAM
MENG TERESA H
TEHRANI ARDAVAN MALEKI
GILBERT JEFFREY M
MCFARLAND WILLIAM
MENG TERESA H
TEHRANI ARDAVAN MALEKI
Application Number:
PCT/US2002/030016
Publication Date:
July 31, 2003
Filing Date:
September 19, 2002
Export Citation:
Assignee:
ATHEROS COMM INC (US)
International Classes:
H03H17/02; H04L5/06; H04L7/00; H04L25/03; H04L27/00; H04L27/26; (IPC1-7): H04L5/06; H04L25/03
Domestic Patent References:
| WO2001010046A2 | 2001-02-08 | |||
| WO2000038387A1 | 2000-06-29 | |||
| WO2000036801A1 | 2000-06-22 |
Foreign References:
| US5970094A | 1999-10-19 | |||
| EP1065855A1 | 2001-01-03 |
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