UPLINK RANDOM ACCESS CHANNEL TRANSMISSION APPARATUS AND METHOD UTILIZING RECIPROCALITY BETWEEN DOWNLINK AND UPLINK CHANNELS IN A ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS-TIME DIVISION DUPLEXING COMMUNICATION SYSTEM

摘要

The present invention is an orthogonal frequency division multiple access-time division duplexing scheme relates to the uplink Random utilizing the correlation properties of the uplink channel and downlink channel in a communication system using an access channel transmission device and method. In the present invention constitutes an uplink ranging channel of a plurality of ranging sub-channel. Terminal utilizes the preamble and the reception information of the pilot tones are received in the downlink the predicting a channel state of each of the ranging sub-channel, and using the predicted results channel condition is to select the best ranging sub-channel after the selected It transmits a ranging signal to the ranging subchannel. In addition, each of the lanes by configuring a ranging subchannel to subcarriers adjacent in frequency and time base, and a ranging sub-channel design to the ranging code transmitted bits have passed through the fading channel of the same characteristics. This invention has the advantage that it may improve the correlation function of the received ranging code attributes to increase the reception power of the ranging signal.; OFDM, OFDMA, TDD, ranging channel, a random access channel