Patent ID: 7483472
Filing Date: 2009-01-27
Classification: H04B,H04L

Abstract:
1. A method for transmitting data by a base station in a multiple access communication system including a plurality of sub-channels, each of which including a predetermined number of sub-carrier bands, the sub-carrier bands being divided from an entire frequency band, the method comprising the steps of: grouping terminals according to the number of sub-carriers allocated to each of a plurality of terminals; wherein each group has at least one terminal; dividing input data streams in a unit of the sub-channels corresponding to each of the grouped terminals into a plurality of data sequences based on a predetermined length; spreading each of the data sequences by a distinct spread spectrum code within each group, respectively; summing and parallel-converting the spread data; hopping each frequency of the parallel-converted data in the unit of the sub-channels based on a frequency hopping pattern allocated to each of the terminals in advance; performing an inverse fast Fourier transform with respect to the hopped parallel-converted data; and transmitting the transformed data.