Patent ID: 6647003
Filing Date: 2003-11-11
Classification: H04B,H04L

Abstract:
A CDMA receiver which receives a data symbol sequence that is spread, and a pilot symbol sequence that is spread and parallel to the data symbol sequence, and which generates a data sequence by demodulating the spread data symbol sequence by using the spread pilot symbol sequence, said CDMA receiver comprising:means for receiving the spread data symbol sequence and the spread pilot symbol sequence; means for generating a data symbol sequence by despreading the spread data symbol sequence; means for generating a pilot symbol sequence by despreading the spread pilot symbol sequence; means for generating from the pilot symbol sequence a plurality of pilot blocks; means for obtaining channel estimates of the data symbols by calculating a weighted sum of averages of the pilot symbols in the individual pilot blocks; means for compensating for channel fluctuations in the data symbol sequence by using the channel estimates of the data symbols; and means for generating the data sequence by demodulating the data symbol sequence compensated for, wherein the spread data symbol sequence has been spread using a first spreading code, the spread pilot symbol sequence has been spread using a second spreading code, said means for generating the data symbol sequence despreads the spread data symbol sequence which has been spread using the first spreading code, and said means for generating the pilot symbol sequence despreads the spread pilot symbol sequence which has been spread using the second spreading code, and wherein the first spreading code and the second spreading code are orthogonal to each other.