AN INITIAL ACQUISITION METHOD FOR M-ARY SPREAD-SPECTRUM SIGNALS USINGHADAMARD CODE SEQUENCES

In this paper, we examine a new initial symbol acquisition method for M-ary spread-spectrum (M-ary/SS) signals that are affected by large ca rrier frequency offset. By the effect of the carrier frequency offset, preamble signal energy is dispersed to the undesired outputs. The pro posed method is based on the collection of such dispersed signal energ ies by using reference patterns. The reference patterns are constructe d by using the characteristic of Hadamard code sequences. The effectiv eness of the proposed method is evaluated in terms of mean acquisition time.