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In this paper, we find the optimum lengths of TUL, TDL and B i.e. the uplink (UL) and downlink (DL) pilots and feedback bits respectively maximizing the sum of the lower bounds of the UL and the DL rates. With the aid of TUL symbols, the Base Station (BS) estimates the UL channel of each user. TDL symbols are means of estimating the downlink channel, which after being normalized and quantized with...
Multiple antennas at the base station can be employed to serve multiple single-antenna users in the downlink of a system. When the number of active users K is larger than the number of transmit antennas M, the base station can exploit multiuser diversity by cleverly scheduling a set of M users. For this purpose, the base station needs to know the downlink channel state information of all the users...
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