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AssigneeAgere Systems Guardian Corp.
InventorsHong Jiang, Paul L. Palmieri, Agesino Primatic, Jr., Lesley J. Wu, Liangkai Yu
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A phase tracker receives a signal component xn and forms a phase- and gain-corrected signal zn. In particular, the phase tracker performs a Hilbert transform of xn to produce a quadrature phase component yn to form the constellation defined by (xn, yn). Consequently, phase rotation and gain adjustment are combined into a linear transform of the constellation defined by (xn, yn). The linear transform zn=αxn+βyn employs two coefficients α and β. The coefficients α and β of the linear transform are derived so as to provide an optimal solution according to minimum mean square error. Approximations to the coefficients α and β of the linear transform may be iteratively determined with a stochastic gradient method. Advantages of employing the phase- and gain-corrected signal zn as an I-phase detection result of a demodulator include 1) the phase rotation and gain adjustment are combined into one operation, and 2) the a sine/cosine lookup table is not employed. Including both phase rotation and a gain adjustment may provide for better performance of the demodulator. In addition, these advantages may result in reduced circuit complexity and reduced added error.
Apparatus for phase tracking of a signal component to provide a corrected signal, the apparatus comprising:
A method of phase tracking of a signal component to provide a corrected signal comprising the steps of:
An integrated circuit having a phase tracking circuit for phase tracking of a signal component to provide a corrected signal, the integrated circuit comprising:
A computer-readable medium having stored thereon a plurality of instructions, the plurality of instructions including instructions which, when executed by a processor, cause the processor to implement a method for phase tracking of a signal component to provide a corrected signal, the method comprising the steps of:
Dependencies are inferred from the claim text.