Patent ID: 7039128

Claim:
An arrangement for synchronizing a receiver into a quadrature amplitude modulated signal, said receiver comprising a first controllable unit ( 601 ) arranged to respond to a timing control signal by controlling the timing by which a received signal is converted into demodulated complex samples in a process comprising sampling and demodulation in any order, and a symbol detector ( 603 ) arranged to produce in correspondence with the demodulated complex samples a detection decision (s) that represents a received symbol; characterized in that it comprises means ( 401 , 402 , 403 , 404 , 405 , 406 , 407 , 408 , 409 , 410 , 411 , 412 , 413 , 414 , 415 , 602 ) for generating one or more complex baseband equivalent impulse response values (h 1 , h 2 , h 3 , h 4 , h 5 ) for a QAM-channel as a correlation result by correlating one or more demodulated complex samples with a correlation variable (C) derived from the detection decision (s), means ( 421 , 605 , 604 ) for generating the timing control signal so that information of both the real part and the imaginary part of said complex baseband equivalent impulse response values are utilised.