Feed-forward carrier recovery system and method

摘要

A method of feedforward phase recovery on a data stream is described. Phase estimation base points are calculated, at a phase detector, for each block of the received data stream. A current phase, at a phase interpolator, between two phase estimation base points. Data stream delays within the phase detector are matched with delays within the phase interpolator.

主权项

1. A method of feedforward phase recovery on a data stream, wherein the data stream includes data frames segmented into data blocks comprising:
calculating phase estimation base points, at a phase detector, for each block of the received data stream, comprising:
calculating one of: a number of sync symbols and a number of pilot symbols in each block;processing each sync symbol or pilot symbol, at a matched filter; andcalculating a carrier phase offset, at the phase detector, over a block of sync symbols or pilot symbols. setting a current phase, at a phase interpolator, between two phase estimation base points; and matching data stream delays within the phase detector with delays within the phase interpolator, wherein the number of said data blocks is calculated by the equationN=64800M*1440,  where M denotes the modulation factor, and the carrier phase offset is calculated by the equationθ⁡(n)=arg(∑N⁢z⁡(nT)⁢a*⁡(nT)),  where z(nT) denotes the matched filter output for each pilot or sync symbol and a(nT) denotes pre-known pilot or sync symbols at time nT.