Patent ID: 8005045
Filing Date: 2011-08-23
Classification: H04L,H04W

Abstract:
1. A method for operating a radio communication system which uses at least a first frequency band, having a first bandwidth, subdivided into C radio resource units which are allocable for radio transmissions between radio stations and terminals, where each radio resource unit has at least two adjacent subcarriers, for allocation of at least a first radio resource unit for a data transmission between a terminal and a radio station, comprising: receiving at the radio station from the terminal a first short training symbol simultaneously from N terminals as N first short training symbols, the first short training symbol having spectrally the first bandwidth and at least Q frequency carriers, where Q is at least as large as C but smaller than a total number of the subcarriers; estimating at the radio station a radio channel for at least the first radio resource unit using the first short training symbol received at the radio station; broadcasting an allocation of the first radio resource unit to the terminal by the radio station; transmitting the N first short training symbols by the N terminals in an orthogonal way by focussing the respective transmission energy in different frequency carriers; and repeating said transmitting of the N first short training symbol J times, where J is not larger than N, while cyclically changing for each terminal the frequency carriers into which the energy is focussed.