Pulse or digital communications – Transceivers – Modems
Patent
1996-06-17
1999-02-09
Chin, Stephen
Pulse or digital communications
Transceivers
Modems
375225, 370252, 455 673, H04B 138, H04L 516
Patent
active
058704299
ABSTRACT:
An apparatus, software modem, and method for a data communications device, such as a modem (100, 101), to determine a symbol rate and carrier frequency, from a received probe signal, for optimizing a bit rate for data transmission and reception. The various embodiments utilizing a processor (108) or a digital signal processor (106) receive a probe signal, which also typically contains noise and other distortions, particularly envelope delay distortion. The various method and apparatus embodiments then determine a variance of the envelope delay distortion, either directly or indirectly as a correlate of attenuation distortion or as a correlate of a selected transmit pre-emphasis filter specified under the ITU V.34 protocol. The variance of the envelope delay distortion is then utilized to eliminate or disable certain symbol rates and corresponding carrier frequencies in the determination of an optimal symbol rate and carrier frequency for data transmission and reception.
REFERENCES:
patent: 5802446 (1998-09-01), Giorgi et al.
Brown William Leslie
Moran III John L.
Verma Sanjeev
Chin Stephen
Deppe Betsy L.
Motorola Inc.
Powell John W.
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