Abstract: An energy detection method is provided. The method obtains an initial time point of an input signal with reference to a digital signal corresponding to the input signal. An ith sample value is obtained by sampling the digital signal. The (i?M?N+1)th to the (i?N)th sample values and the (i?N+1)th to the ith sample value are buffered. The weighting coefficient is set to with initial value. A first parameter is obtained according to the weighting coefficient and the (i?M?N+1)th to the (i?N)th sample values, and a second parameter is obtained according to the (i?N+1)th to the ith sample values. A comparison between the first parameter and the second parameter is made, and the sampling time point of the (i?N+1)th sample value is determined as the signal initial time point when the second parameter is greater than the first parameter.

Abstract: A transmitting terminal includes a signal processing unit, MS RF units, MT transmit antennas and a switch unit. The signal processing unit has K precoders for precoding K data streams corresponding to K receiving terminals. The MS RF units output MS up-converted transmit signals based on the precoded K data streams. The switch unit is coupled between the RF units and the transmit antennas and controlled by the signal processing unit for selection of the transmit antennas. The signal processing unit sets the MT transmit antennas as a universal set, calculates a plurality of sum rates corresponding to a plurality of subsets, each subset excluding an ith transmit antenna, according to channel state information, selects the subset with a maximum sum rate as the universal set of a next iteration, and then repeats the calculating and selecting steps until the subset with the maximum sum rate remaining MS transmit antennas.

Abstract: A transmitting terminal includes a signal processing unit, MS RF units, MT transmit antennas and a switch unit. The signal processing unit has K precoders for precoding K data streams corresponding to K receiving terminals. The MS RF units output MS up-converted transmit signals based on the precoded K data streams. The switch unit is coupled between the RF units and the transmit antennas and controlled by the signal processing unit for selection of the transmit antennas. The signal processing unit sets the MT transmit antennas as a universal set, calculates a plurality of sum rates corresponding to a plurality of subsets, each subset excluding an ith transmit antenna, according to channel state information, selects the subset with a maximum sum rate as the universal set of a next iteration, and then repeats the calculating and selecting steps until the subset with the maximum sum rate remaining MS transmit antennas.

Abstract: An energy detection method is provided. The method obtains an initial time point of an input signal with reference to a digital signal corresponding to the input signal. An ith sample value is obtained by sampling the digital signal. The (i?M?N+1)th to the (i?N)th sample values and the (i?N+1)th to the ith sample value are buffered. The weighting coefficient is set to with initial value. A first parameter is obtained according to the weighting coefficient and the (i?M?N+1)th to the (i?N)th sample values, and a second parameter is obtained according to the (i?N+1)th to the ith sample values. A comparison between the first parameter and the second parameter is made, and the sampling time point of the (i?N+1)th sample value is determined as the signal initial time point when the second parameter is greater than the first parameter.

Abstract: A method and apparatus are disclosed for phase quantization and equal gain precoding in a wireless communication system. The method includes scaling, by a receiving device, a phase vector based on a predetermined scaling factor to determine a first lattice point. The method also includes determining, by the receiving device, a second lattice point based on the determined first lattice point. In addition, the method includes determining, by the receiving device, a quantized phase vector based on the determined second lattice point and the predetermined scaling factor.