Patent ID: 8995574
Filing Date: 2015-03-31
Classification: H04L

Abstract:
1. A method for transmitting signals of a transmitting end in a multi-carrier radio transmission system, the method comprising: encoding and interleaving data; inserting a pilot signal into the encoded and interleaved data; performing an inverse fast fourier transform (IFFT) transformation on the pilot signal-inserted data; and transmitting the IFFT transformed data through at least one antenna, wherein pilot signals are transmitted via pilot streams in positions based on cyclic selection, which considers both of a time domain and a frequency area from a first group of orthogonal frequency division multiplexing (OFDM) symbols to a (└N/4┘×2)th group of OFDM symbols for transmission of the pilot signals, wherein a transmission block is composed of N consecutive OFDM symbols in a time domain and M consecutive physical sub-carriers in a frequency area, where each of N, M is a positive integer, and wherein └N/4┘×2 groups of OFDM symbols, which are closest on either side to OFDM symbols in the center of the time domain, among K groups of OFDM symbols are sorted based on the cyclic selection such that g(1) stands for a group of OFDM symbols first closest to either side, g(2) stands for a group of OFDM symbols (└N/4┘×2)th closest to either side, g(3) stands for a group of OFDM symbols second closest to either side, g(4) stands for a group of OFDM symbols (└N/4┘×2−1)th closest to either side, . . . , g(└N/4┘×2−1) stands for a group of OFDM symbols (└N/4┘)th closest to either side, and g(└N/4┘×2) stands for a group of OFDM symbols (└N/4┘+1)th closest to either side.