Fully digital symbol synchronization technique

Details Fully digital symbol synchronization technique Fully digital symbol synchronization technique

2001-12-14

2004-09-28

Mai, Tan V. (Department: 2124)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

Reexamination Certificate

active

06799193

ABSTRACT:

FIELD
The invention relates to the field of communications. In particular, one embodiment of the invention relates to a system and method for extracting symbol timing from preamble symbols of a signal in a reliable, robust and computationally efficient manner.
BACKGROUND
Many modern communication schemes rely on digital information transmissions. Information is digitized and then transmitted via an analog or digital carrier signal.
As illustrated in
FIG. 1
, a transmitter device
102
typically modulates digitized information into a carrier signal. The transmitter device then transmits the carrier signal on a channel to a receiver device
104
over a transmission medium
106
. The receiver device
104
typically demodulates the received carrier signal to extract the digital information found therein.
In typical communication schemes, a receiver device
104
determines where the received digital information begins. Before demodulating a received signal, the receiver device
104
aligns or synchronizes the received signal in order to determine the start of a signal, information, or message and/or to determine whether such signal contains a message. Synchronization permits the device to extract accurate information from the signal.
The synchronization process is sometimes made more difficult when the carrier signal and/or information therein has been corrupted, altered, and/or is more difficult to detect as a result of noise, interference, or some other factor. The transmission medium
106
over which the carrier signal is transmitted is one place where the carrier signal and/or information therein are susceptible to such degradation
108
. The transmission medium typically includes wired and/or wireless (air) transmission paths.
Despite the possible degradation of a carrier signal and/or information therein, a receiver device must be able to detect a signal and determine its content in order for communications to occur.


REFERENCES:
patent: 5428647 (1995-06-01), Rasky et al.
patent: 5898684 (1999-04-01), Currivan et al.
patent: 0782295 (1997-07-01), None
patent: WO 96/19056 (1996-06-01), None
Broadband Radio Access Networks (BRAN); HIPERLAN Type 2; Physical (PHY) layer, ETSI TS 101 475 V1.1. (2000-04), XP-002199125, p. 23.

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