Combining pilot-symbol-based phase estimation with data-symbol-based phase estimation

摘要

A method for a receiver to estimate phase of a carrier wave, including receiving a carrier wave carrying pilot symbols and data symbols extending between the pilot symbols, determining phase of the carrier wave at received pilot symbols, and interpolating the phase of the carrier wave at points between pilot symbols based, at least in part, on an estimated phase of demodulated data symbols. Apparatus for estimate phase of a carrier wave, including a unit for determining phase of the carrier wave at received pilot symbols, and a unit for interpolating the phase of the carrier wave at points between pilot symbols based, at least in part, on an estimated phase of demodulated data symbols. Related apparatus and methods are also described.

主权项

1. A method for a receiver to estimate phase of a carrier wave, comprising:
receiving a carrier wave carrying pilot symbols and data symbols extending between the pilot symbols; demodulating received pilot symbols, producing demodulated pilot symbols; determining phase of the carrier wave at received pilot symbols based on a phase of the demodulated pilot symbols; demodulating received data symbols, producing demodulated data symbols; and interpolating the phase of the carrier wave at points between pilot symbols based, at least in part, on a phase of the demodulated data symbols, wherein: (a) the interpolating comprises computing a phase trajectory function:
to approximately fit the phase trajectory function to the determined phase at the received pilot symbols; andto approximately fit the estimated phases at the demodulated data symbols; and (b) the computing the phase trajectory function further includes computing more than one phase trajectory function, and computing a linear combination of at least some of the more than one phase trajectory functions.