CSI FEEDBACK MODES AND INDICATION FOR SUB CHANNEL FEEDBACK IN OFDMA SYSTEMS

摘要

A method of indicating feedback mode and providing corresponding sub-channel feedback in OFDMA systems is provided. A transmitting device transmits a sounding announcement frame and a sounding signal to a receiving device. The sounding signal is transmitted over multiple sub-channels of a wide channel. The transmitting device also provides a feedback mode indication. The receiving device estimates channel quality information based on the received sounding signal and the feedback mode indication. The receiving device then sends feedback information to the transmitting device. The feedback information contains the estimated channel quality information of a selected set of sub-channels based on the feedback mode indication.