Methods and systems for combined cyclic delay diversity and precoding of radio signals

Patent metadata

Field	Value
Publication number	US-9258041-B2
Application number	US-201514709805-A
Country	US
Kind code	B2
Filing date	May 12, 2015
Priority date	Feb 13, 2007
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

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.

First claim

The invention claimed is:

1. 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;
means for precoding said symbol vectors by multiplying said symbol vectors with:
a first column subset of a unitary matrix which spreads symbols in said symbol vectors across virtual transmit antennas,
a second diagonal matrix which changes a phase of said virtual tra…

Assignees

• Ericsson Telefon Ab L M

Inventors

• Jöngren George
• Göransson Bo

Classifications

• H04B7/0465

  Electricity · mapped topic

• H04L25/03898

  Electricity · mapped topic

• H04B7/0697

  Electricity · mapped topic

• H04B7/0671

  Electricity · mapped topic

• H04L27/2647

  Electricity · mapped topic