Receiver and method for receiving digital signal
View Patent ↗The present invention provides a receiver for receiving digital signals including frames with a binary modulated cyclic preamble, comprising: means for correlating at least part of a first cyclic preamble in a first frame and at least part of a second cyclic preamble in a second frame, and for determining a carrier frequency offset based on said correlation.
1. A receiver for receiving digital signals including frames, wherein, each frame comprises a binary modulated cyclic preamble and the binary modulated cyclic preamble comprises a pseudo noise sequence, wherein, bits of the pseudo noise sequence in a frame is shifted from those in a previous sequence, comprising:
a shifter for shifting at least one of a first pseudo noise sequence in a first cyclic preamble of a first frame and a second pseudo noise sequence in a second cyclic preamble of a second frame if there is a phase rotation between the first pseudo noise sequence and the second pseudo noise sequence; and
a correlator for correlating two resultant pseudo noise sequences from the first pseudo noise sequence and the second pseudo noise sequence after the shifting by the shifter, and for determining a carrier frequency offset based on said correlation.
2. The receiver according to claim 1 , further comprising a carrier frequency compensation unit for compensating the carrier frequency offset for the received digital signals.
3. The receiver according to claim 1 , wherein the first cyclic preamble and the second cyclic preamble are from two successive frames respectively.
4. A method for receiving digital signals including frames, wherein, each frame comprises a binary modulated cyclic preamble and the binary modulated cyclic preamble comprises a pseudo noise sequence, wherein, bits of the pseudo noise sequence in a frame is shifted from those in a previous sequence, comprising:
shifting at least one of a first pseudo noise sequence in a first cyclic preamble of a first frame and a second pseudo noise sequence in a second cyclic preamble of a second frame if there is a phase rotation between the first pseudo noise sequence and the second pseudo noise sequence;
correlating two resultant pseudo noise sequences from the first pseudo noise sequence and the second pseudo noise sequence after the shifting operation, and
determining a carrier frequency offset based on the correlating.
5. The method according to claim 4 , further comprising compensating the carrier frequency offset for the received digital signals.
6. The method according to claim 4 , wherein the first cyclic preamble and the second cyclic preamble are from two successive frames respectively.