Patent ID: 8559563

Claim:
Apparatus for use in a receiver, the apparatus comprising: a carrier tracking loop for tracking a carrier in a received signal; and a symbol timing recovery loop for tracking symbol timing in the received signal; wherein the carrier tracking loop is driven as a function of a first pseudo tone and the symbol timing recovery loop is driven as a function of a second pseudo tone, the first and second pseudo-tones being developed from both edges of a staggered quadrature amplitude modulated version of the received signal such that the first pseudo tone is determined as a function of carrier offset excluding symbol timing offset, and the second pseudo tone is determined as a function of symbol timing offset excluding carrier offset; wherein the first and second pseudo-tones are provided by a detector that filters a lower edge and an upper edge of the staggered quadrature amplitude modulated version of the received signal; the detector further comprising: an upper filter for filtering the upper edge of the staggered quadrature amplitude modulated version of the received signal for providing a filtered upper signal; a lower filter for filtering the lower edge of the staggered quadrature amplitude modulated version of the received signal for providing a filtered lower signal; a squarer for squaring the filtered upper signal for providing a squared upper signal; a squarer for squaring the filtered lower signal for providing a squared lower signal; a multiplier for providing the first pseudo tone representing a product of the squared upper signal and the squared lower signal; and a multiplier for providing the second pseudo tone representing a product of the squared upper signal and a conjugate of the squared lower signal.