WIRELESS COMMUNICATION METHODS AND APPARATUS
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United States of America Patent
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Mar 30, 2015
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Mar 30, 2015
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Abstract
In an embodiment, a wireless communication method of transmitting a plurality of data streams from a transmitter to a receiver is disclosed. The transmitter comprises a plurality of antennas. The method comprises: encoding each of the data streams as a sequence of code words; determining a plurality of precoding transmit coefficients from channel information for each of a plurality of subcarriers, the precoding transmit coefficients defining spatial channels between the plurality of antennas of the transmitter and the receiver; determining a set of power loading factors for each spatial channel between the receiver and the transmitter, each set of power loading factors comprising a power loading factor for each of the plurality of subcarriers, by allocating power between the plurality of subcarriers to satisfy a signal to interference and noise target per code word; determining a signal for transmission by each antenna of the plurality of antennas by applying respective precoding coefficients and power loading factors to each respective sequence of code words; and transmitting each of the sequences of code words on a plurality of subcarriers of at least one of the spatial channels by transmitting the respective signals for transmission from each respective antenna.
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