Link adaptation for MIMO transmission schemes
First Claim
1. A method of transmitting information in a communication between a transmitter (1) having more than one transmit antenna and a receiver (2) having more than one receive antenna, whereby information to be transmitted is divided into a plurality of subsignals (Layer 0, Layer 1, Layer 2, Layer 3), each subsignal (Layer 0, Layer 1, Layer 2, Layer 3) is processed separately before it is emitted by said transmit antennas and whereby in the receiver (2) the receive signal is processed thus that subsignals are detected and decoded and the contribution of each detected and decoded subsignal is subtracted from the receive signal and whereby a feedback channel (4) from receiver to transmitter is used to send control information to the transmitter according to the receive situation, characterized in that, in the receiver the link quality of each subsignal is determined, information of each subsignal is transmitted to the transmitter (1) via the feedback channel (4) and that in the transmitter (1) properties of the subsignals are controlled by the feedback information.
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Abstract
MIMO transmission methods are applied to communicaiton systems in which a transmitter has more than one transmit antenna and a receiver has more than one receive antenna. Information to be transmitted is divided into a plurality of subsignals according to the number of used transmit antennas and each subsignal is processed separately before it is emitted by the respective transmit antenna. In the receiver the different receive signals are processed thus that subsignals are detected and decoded and the contribution of each detected and decoded subsignal is subtracted from the receive signals and whereby a feedback channel from receiver to transmitter is used to send control information to the transmitter depending on the receive situation. In order to optimize the usage of the MIMO channel the invention proposes the in the receiver the link quality of each subsignal is determined and information of each subsignal is transmitted to the receiver via the feedback channel and that in the transmitter properties of the subsignals are controlled by the link quality information.
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Citations
21 Claims
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1. A method of transmitting information in a communication between a transmitter (1) having more than one transmit antenna and a receiver (2) having more than one receive antenna, whereby information to be transmitted is divided into a plurality of subsignals (Layer 0, Layer 1, Layer 2, Layer 3), each subsignal (Layer 0, Layer 1, Layer 2, Layer 3) is processed separately before it is emitted by said transmit antennas and whereby in the receiver (2) the receive signal is processed thus that subsignals are detected and decoded and the contribution of each detected and decoded subsignal is subtracted from the receive signal and whereby a feedback channel (4) from receiver to transmitter is used to send control information to the transmitter according to the receive situation, characterized in that,
in the receiver the link quality of each subsignal is determined, information of each subsignal is transmitted to the transmitter (1) via the feedback channel (4) and that in the transmitter (1) properties of the subsignals are controlled by the feedback information.
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20. A transmitter for a MIMO transmission system having more than one transmit antenna whereby information to be transmitted is divided into a plurality of subsignals according to the number of used transmit antennas and each subsignal is processed separately before it is emitted by the respective transmit antenna and whereby on a feedback channel control information from a receiver is received, characterized in that,
information of the link quality of each subsignal is received via the feedback channel and that the transmitter controls properties of the subsignals based on the link quality information.
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21. A receiver for a MIMO communication system having more than one receive antenna, whereby receive signals of a respective receive antenna are processed thus that subsignals are detected and decoded and the contribution of each detected and decoded subsignal is subtracted from the receive signals and whereby a feedback channel from the receiver to a transmitter is used to send control information to the transmitterer depending on the receive situation, characterized in that,
in the receiver the link quality of each subsignal is determined, information of each subsignal is transmitted to the receiver via the feedback channel for adapting the properties of the subsignals in a respective transmitter.
Specification