Patent ID: 7929624
Filing Date: 2011-04-19
Classification: H04J,H04L

Abstract:
1. A method of ascertaining which one of a number of cells of a cellular communication system transmitted an Orthogonal Frequency Division Multiplexing (OFDM) signal, the method comprising: cellular communication equipment performing the following: obtaining a plurality of reference symbols from the OFDM signal; estimating one or more compensating phase shift values for aligning the plurality of reference symbols with respect to phase without utilizing a reference phase obtained by channel estimation; generating a plurality of phase corrected reference symbols by using the one or more compensating phase shift values to align the plurality of reference symbols with respect to phase; applying at least two scrambling code sequences to the phase corrected reference symbols to obtain at least two de-scrambled phase corrected reference symbol sequences, wherein each of the scrambling codes is associated with a respectively different one of the cells of the cellular communication system, and wherein each of the scrambling code sequences comprises at least one of a pseudorandom noise sequence and an orthogonal code; ascertaining a power value of each of the de-scrambled phase corrected reference symbol sequences; and ascertaining which one of the scrambling codes is associated with a highest one of the power values, thereby ascertaining which one of the number of cells of the cellular communication system transmitted the OFDM signal.