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US 2013/0170573 A1Published application
Adaptive Transmit Beamforming
AssigneeBroadcom Corporation
InventorsLouay JALLOUL, Bertrand Hochwald
Life of this patent
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Abstract
Embodiments of a method and apparatus for selecting one of several different power constraints under which sets of complex, beam weights are normalized are described herein. The embodiments of the method and apparatus specifically select the power constraint based on a code rate used to encode information carried by a transmit signal weighted by the sets of complex, beam weights. Appropriate selection of the power constraint can improve the bit error rate (BER) or block error rate (BLER) of the decoded transmit signal at a receiver.
Claims18
A beamformer comprising:
- a weight calculator configured to determine M sets of weights based on an estimated channel between M antennas at a transmitter and an antenna at a receiver, wherein each of the M sets of weights corresponds to a different one of the M antennas at the transmitter and is used to weight F source symbols for transmission from the different one of the M antennas at the transmitter to which the set of weights corresponds;
- and
- a normalizer configured to normalize the M sets of weights under a power constraint determined based on a code rate used to encode information mapped to the F source symbols.
A method comprising:
- determining M sets of weights based on an estimated channel between M antennas at a transmitter and an antenna at a receiver, wherein each of the M sets of weights corresponds to a different one of the M antennas at the transmitter and is used to weight F source symbols for transmission from the different one of the M antennas at the transmitter to which the set of weights corresponds;
- normalizing the M sets of weights under a power constraint determined based on a code rate used to encode information mapped to the F source symbols.
Dependencies are inferred from the claim text.