Method and apparatus for subcarrier and antenna selection in MIMO-OFDM system

摘要

A method and apparatus for radio resources control in a multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) communication system are disclosed. A channel metric is calculated for each of a plurality of transmit antennas. Sub-carriers are allocated to each transmit antenna in accordance with the channel metric of each transmit antenna. Signals are transmitted using the allocated sub-carriers at each antenna. Adaptive modulation and coding and transmit power control of each sub-carrier may be further implemented in accordance with the channel metric. Power control may be implemented per antenna basis or per sub-carrier basis. In performing power control, a subset of transmit antennas may be selected and waterpouring may be applied only to the selected antennas. Waterpouring may be based on SNR instead of channel response.

主权项

1. A method, implemented by a transmitter, of selecting antenna circuits for transmitting signals, the method comprising:
configuring the transmitter with a plurality of antenna circuits operating in parallel, each antenna circuit including an adaptive modulation and coding (AMC) unit configured to adjust at least one of modulation order and coding rate applied to a data stream that flows through a sub-carrier modulation unit, a sub-carrier transmit power control (TPC) unit and an antenna connected in series; using a channel estimator residing in the transmitter to calculate a channel metric for each of the antenna circuits; and using a controller residing in the transmitter and in communication with the channel estimator and the antenna circuits to select a subset of sub-carriers associated with the antenna circuits, control the sub-carrier modulation unit to modulate the selected sub-carriers, and control the sub-carrier TPC unit to adjust transmit power level of the selected sub-carriers.