Frame synchronization method and receiver for communication modem using the same
AssigneeElectronics and Telecommunications Research Institute
InventorsKi Hyuk Park, Bon Tae Koo, Nak Woong Eum
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Abstract
Disclosed are a frame synchronization method and a receiver for a communication modem using the same. The frame synchronization method includes performing a correlation operation between a reception data stream and a preamble to output a synchronous signal; and computing correlation values between spreading codes and a reception data stream synchronized with the synchronous signal, wherein a maximum value of the computed correlation values is compared with a preset threshold value, and the outputting of the synchronous signal is performed again when the maximum value is smaller than the preset threshold value.
Claims7
A frame synchronization method comprising:
- performing a correlation operation between a reception data stream and a preamble to output a synchronous signal;
- and
- computing correlation values between spreading codes and a reception data stream synchronized with the synchronous signal,
- wherein a maximum value of the computed correlation values is compared with a preset threshold value, and the outputting of the synchronous signal is performed again when the maximum value is smaller than the preset threshold value.
A receiver for a communications modem comprising:
- a frame synchronizer performing a correlation operation between a reception data stream and a preamble to output a synchronous signal;
- a despreader computing correlation values between spreading codes and a reception data stream synchronized with the synchronous signal, and outputting, as demodulated data, an index value of a spreading code corresponding to a maximum value of the computed correlation values;
- and
- a comparator comparing the maximum value with a preset threshold value, and transmitting a restart signal for restarting the correlation operation to the frame synchronizer when the maximum value is smaller than the preset threshold value.
Dependencies are inferred from the claim text.