Patent ID: 6483821
Filing Date: 2002-11-19
Classification: H04B,H04L

Abstract:
Apparatus for receiving digital information over mobile communication channels, said apparatus comprising:means for receiving blocks of digital data transmitted over the mobile communications channels, said blocks of digital data includes pilot symbols periodically inserted into said blocks of digital data for subsequent channel estimation; means for performing channel estimation using said received blocks of digital data using an iterative channel estimating procedure; means for combining said received blocks of digital data; and means for decoding said combined blocks of digital data to retrieve transmitted information; and said channel estimation means includes: means for determining an initial channel estimation from said received blocks of digital data; means for combining said received blocks of digital data, said combined data having an associated signal-to-noise ratio; means for determining said associated signal to noise ratio; means for demodulating said combined data by a first method if said associated signal-to-noise ratio at least meets a first pre-determined threshold and for demodulating said combined data by a second method otherwise; means for removing said digital data from said demodulated signal to generate an updated channel signal; and means for determining whether improvement in said associated signal to noise ratio at least meets an acceptable level.