Robust utilization of feedback information in space-time coding
OwnerGeorge Jöngren, Mikael Skoglundinventors
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Abstract
Side information in the form of quantized channel feedback information is utilized to improve an orthogonal space-time block code by means of a linear transformation. The feedback link utilizes COVQ quantization in order to provide the transmitter with an estimate of the current channel realization. The channel realization estimate, together with reliability information, is then used in the transmission scheme for determining the appropriate linear transformation. The result is a system which effectively combines conventional transmit beamforming with orthogonal space-time block coding, thereby providing a scheme which is more robust with respect to the errors that originate from the noise in the feedback channel.
Claims28
A method of utilizing feedback information in space-time coding, the method comprising:
- mapping data to be transmitted into codewords which are split into a plurality of parallel and different symbol sequences;
- deriving side information from initial side information which has been transmitted to the transmitter over a feedback link from a receiver;
- and
- performing a linear transformation of the codewords based on side information obtained at the transmitter.
A method of using quantized feedback in a transmission scheme, the method comprising:
- quantizing initial side information at the receiver using a channel optimized vector quantizer (COVQ);
- transmitting the quantized initial side information to the transmitter over a feedback link;
- deriving side information from the quantized information received over the feedback link;
- and
- mapping data to be transmitted into codewords based on the derived side information.
A system for providing transmit spatial diversity, the system comprising:
- a transmitter;
- a receiver;
- and
- a feedback link, wherein the transmitter is configured to:
- decode quantized initial side information transmitted from the receiver over the feedback link;
- derive channel information and a corresponding quality measure from the quantized initial side information;
- and
- perform a linear transformation of the data to be transmitter based on the channel information and corresponding quality measure.
Dependencies are inferred from the claim text.