Patent ID: 7885357

Claim:
An apparatus for signal detection in a receiver, wherein a digital signal indicating a plurality of sequential data sets is provided in the receiver in response to a signal received from a communication link, each data sets indicating a first component and a second component representing the digital signal, the apparatus comprising: a sequence generator for generating a sequence signal indicating respective sequential phases of the data sets indicated by the digital signal; a memory for buffering an amount of data indicating the digital signal and the sequence signal to provide a buffered digital signal and a buffered sequence signal; a phase rotation circuit, coupled to the memory to receive the buffered digital signal and the buffered sequence signal from the memory, for derotating the buffered digital signal according to the buffered sequence signal to produce a derotated digital signal; and a digital filtering unit, coupled to the phase rotation circuit and the memory, for filtering the derotated digital signal to generate a first filtered output signal with a first bandwidth, for filtering the buffered digital signal to generate a second filtered output signal with a second bandwidth, and for filtering the buffered digital signal to generate a third filtered output signal with a third bandwidth, wherein the second bandwidth and the third bandwidth are different.