Patent ID: 9019919
Filing Date: 2015-04-28
Classification: H04B

Abstract:
1. A base station apparatus provided with a plurality of transmitting antennas which performs spatial multiplexing to data signals addressed to a plurality of terminal apparatuses having a plurality of receiving antennas for performing communication, the base station apparatus comprising: a base station receiver configured to receive channel state information between the transmitting antennas and each of the terminal apparatuses from each of the terminal apparatuses, and demodulates so that the channel state information fed back from each of the terminal apparatuses is obtained; a transmit weight calculator configured to calculate a transmit weight for performing spatial multiplexing transmission to the terminal apparatuses based on the channel state information fed back from each of the terminal apparatuses; a modulator configured to modulate a control signal including a terminal ID which specify each of the terminal apparatuses and a data signal including an information signal addressed to each of the terminal apparatuses; a transmit weight multiplier configured to multiply the modulated data signal by the transmit weight, and multiplies a preamble including a signal for channel estimation addressed to each of the terminal apparatuses by the transmit weight; a signal multiplexer configured to perform spatial multiplexing to the multiplied data signal, and multiplexes the data signal subjected to spatial multiplexing, the multiplied preamble and the modulated control signal, as multiplexed signals; and a base station transmitter configured to transmit the multiplexed signals, wherein a position of the terminal ID or a position of the signal for channel estimation corresponds to a position of an information signal that needs to be demodulated by each of the terminal apparatuses, the terminal ID being included in the control signal and specifying each of the terminal apparatuses, and the signal for channel estimation being included in the preamble and being addressed to each of the terminal apparatuses.