Coarse timing/frame acquisition in OFDM system using time division multiplexed pilot symbol
AssigneeQUALCOMM Incorporated
InventorsVinay Murthy, Alok Kumar Gupta
Life of this patent
Estimating the term…
Abstract
Systems and methods are provided for processing Time Domain Multiplexing (TDM) symbols via delayed correlation in the time domain. In one embodiment, a method is provided for determining synchronization information in an Orthogonal Frequency Division Multiplexing (OFDM) broadcast. The method includes employing a time domain correlation to detect the start of an OFDM super frame and utilizing the time domain correlation to synchronize a receiver to the carrier frequency of the OFDM signal.
Claims33
A method for determining synchronization information, comprising:
- employing a time domain correlation to detect the start of an OFDM super frame;
- and
- utilizing the time domain correlation to synchronize a receiver to a frequency component of the OFDM super frame.
A correlator module for a wireless network system, comprising:
- a time domain correlator that processes a super frame field to detect a signal magnitude in the time domain;
- and
- a threshold detector that employs the signal magnitude to derive a start synchronization signal for the super frame field.
A system for determining timing data in a wireless network, comprising:
- means for analyzing a super frame to detect a signal magnitude in the time domain;
- and
- means for detecting the signal magnitude to determine a start timing signal for the super frame.
A machine readable medium having machine executable instructions stored thereon, comprising:
- processing an OFDM packet to detect a signal magnitude in the time domain;
- and
- means for detecting the signal magnitude to determine a start timing signal for the OFDM packet.
A machine readable medium having a data structure stored thereon, comprising:
- a plurality of data fields storing correlated values from an OFDM broadcast packet;
- a data field to store a threshold value for analyzing the OFDM broadcast packet;
- and
- a comparator field to determine a start sequence base in part on the threshold value and the OFDM broadcast packet.
A wireless communications apparatus, comprising:
- a memory that includes a component to determine a time domain correlator values from a receive OFDM broadcast;
- and
- a processor that determines a start time by comparing the time domain correlator values to a programmable threshold.
A processor that executes instructions for determining timing information for a wireless communication environment, the instructions comprising:
- receiving an OFDM broadcast packet;
- determining time domain correlations to the OFDM broadcast packet;
- and
- determining a start time synchronization for a wireless receiver base in part on the time domain correlations and at least one threshold value.
Dependencies are inferred from the claim text.