Patent ID: 7535860
Filing Date: 2009-05-19
Classification: H04L

Abstract:
1. A method for transmitting a pilot symbol from a base station (BS) to a subscriber station (SS) in a communication system, the method comprising the steps of: transmitting a first set of sub-carriers being mapped to a first sequence based on an identifier of the base station in a frequency domain of the pilot symbol; and transmitting a second set of sub-carriers being mapped to a second sequence for reducing a PAPR (Peak to Average Power Ratio) of the pilot symbol together with the transmission of the first set of sub-carriers in the frequency domain; wherein the first sequence based on the identifier of the base station is generated by using a Walsh Hadamard matrix each row of which includes Walsh codes, a specific row of the Walsh Hadamard matrix corresponds to an identifier of a specific base station and is interleaved according to a predetermined interleaving scheme, an interleaved signal is mapped to predetermined sub-carriers to form the first set of sub-carriers, when the first set of sub-carriers are transmitted; and wherein the first sequence based on the identifier of the base station is defined by where H