Methods and systems for combined cyclic delay diversity and precoding of radio signals
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsGeorge JÖNGREN, Bo GÖRANSSON
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Abstract
In a transmitter or transceiver, signals can be precoded by multiplying symbol vectors with various matrices. For example, symbol vectors can be multiplied with a first column subset of unitary matrix which spreads symbols in the symbol vectors across virtual transmit antennas, a second diagonal matrix which changes a phase of the virtual transmit antennas, and a third precoding matrix which distributes the transmission across the transmit antennas.
Claims16
1-36. (canceled)
A method for transmitting information signals having a plurality of symbol vectors associated therewith on a radio channel, comprising:
- applying a channel-dependent first precoding matrix and cyclic delay diversity (CCD) matrix to the symbol vectors;
- subsequently applying a second precoding matrix to obtain precoded symbol vectors;
- further processing the precoded symbol vectors to obtain information signals;
- and
- transmitting the information signals and transmitting signaling representing elements of the first precoding matrix.
A transmitter for transmitting information signals having a plurality of symbol vectors associated therewith on a radio channel, comprising:
- a plurality of physical transmit antennas;
- a processor for precoding said symbol vectors by:
- applying a channel-dependent first precoding matrix and cyclic delay diversity (CCD) matrix to the symbol vectors;
- subsequently applying a second precoding matrix to obtain precoded symbol vectors;
- and
- further processing the precoded symbol vectors to obtain information signals;
- a transmit chain of elements for transmitting said information signals as well as signaling representing elements of the first precoding matrix using said plurality of physical transmit antennas.
A method for equalizing information signals having a plurality of symbol vectors associated therewith, comprising:
- receiving over a radio channel information signals as well as signaling representing elements of a first precoding matrix;
- forming a channel estimate associated with said received information signals by multiplying an initial channel estimate with a channel-dependent first precoding matrix and cyclic delay diversity (CCD) matrix, and subsequently multiplying with a second precoding matrix;
- and
- equalizing said information signals using the channel estimate thus formed.
A receiver for equalizing information signals having a plurality of symbol vectors associated therewith, comprising:
- a plurality of physical receive antennas;
- a receive chain of elements for receiving said information signals as well as signaling representing elements of a channel-dependent first precoding matrix using said plurality of physical transmit antennas;
- and
- a processor configured to:
- form a channel estimate associated with said received information signals by multiplying an initial channel estimate with the first precoding matrix and a cyclic delay diversity (CCD) matrix, and subsequently multiplying with a second precoding matrix;
- and
- equalizing said information signals using the channel estimate thus formed.
Dependencies are inferred from the claim text.