Patent ID: 7257166
Filing Date: 2007-08-14
Classification: H04L

Abstract:
1. A data communication apparatus based on orthogonal frequency division multiple access (OFDMA) comprising a first user transmitting unit through which a user transmits user information to a base station in units of first symbol blocks each including a first predetermined number M of symbols in data communication between the user and the base station, the first user transmitting unit comprising: a first encoder for generating a first sub-block composed of a second predetermined number M a first block repeater for repeating the first sub-block a third predetermined number L a first multiplier for multiplying the M symbols a a first cyclic extension symbol inserter for outputting the first symbol block completed by inserting a cyclic extension symbol into the u-th user signal x a first signal transmitter for converting the completed first symbol block into a symbol block signal and transmitting the symbol block signal, wherein M