Patent ID: 7542504
Filing Date: 2009-06-02
Classification: H04B,H04L

Abstract:
1. method for performing frequency hopping Orthogonal Frequency Division Multiple Accesses (OFDMA), comprising the steps of: a) allocating frequency domain signals X(k) of a comb pattern to a modulated data sequence, X(k) being comb symbols and k being a frequency index; b) performing frequency hopping so that the comb symbols could have an independent frequency offset; and c) performing inverse Fast Fourier Transform (iFFT) on the comb symbols to be transformed to time domain signals x(n) and transmitting, using a transmitter, the time domain signals x(n), n being a time index, wherein the comb symbols formed of a predetermined number of sub-carriers, which is called a sub-carrier group, are positioned on an entire usable frequency band at predetermined intervals and the number of subcarriers on the entire usable frequency is expressed as: where N N wherein, in the step b), frequency hopping is performed on comb symbols X where P(l) (0≦P(l)≦N) is a frequency hopping pattern of comb symbols within a cell in a time slot N denotes the entire number of sub-carriers.