Channel length estimation and accurate FFT window placement for high-mobility OFDM receivers in single frequency networks
AssigneeTexas Instruments Incorporated
InventorsBadri Varadarajan, Anand Dabak, Charles Sestok, Srinath Hosur
Life of this patent
Estimating the term…
Abstract
A method of estimating a channel length (304) in a wireless receiver is disclosed. The receiver receives a signal (122) from a remote transmitter. The receiver selects a plurality (K) of different candidate channel lengths and determines a respective criterion value (402) of the signal for each of the plurality of different candidate channel lengths. The receiver selects a channel length (410) from the plurality of different candidate channel lengths in response to the respective criterion value (404).
Claims18
A method of estimating a channel length in a wireless receiver, comprising:
- receiving a signal from a remote transmitter;
- selecting a plurality of different candidate channel lengths;
- determining a respective criterion value of the signal for each of the plurality of different candidate channel lengths;
- and
- selecting a channel length from the plurality of different candidate channel lengths in response to the respective criterion value.
A method of channel synchronizing a wireless receiver, comprising:
- selecting a plurality of different candidate channel placements;
- determining a plurality of groups of data signals, each group corresponding to a respective candidate channel placement;
- calculating a respective signal quality for each group;
- and
- selecting a candidate channel placement corresponding to the group having the best signal quality.
A method of channel synchronizing a wireless receiver, comprising:
- a) selecting a first candidate channel placement;
- b) receiving a plurality of groups of data signals, each group corresponding to the first candidate channel placement;
- c) identifying a strong signal in a group of data signals;
- d) identifying a weak signal in the group of data signals;
- e) comparing the weak signal to a first threshold value;
- f) incrementing a first counter conditionally in response to step (e);
- and
- g) repeating steps (c) through (f) for each group of the plurality of groups;
- and
- h) correcting the first candidate channel placement in response to a count in the first counter.
Dependencies are inferred from the claim text.