Reference signaling scheme using compressed feedforward codebooks for multi-user multiple input multiple output (MU-MIMO) systems

A base station configured to compress a feed forward codebook, comprising:

• a wireless transceiver;
• a processor;
• a non-transitory computer readable apparatus having a storage medium comprising at least one computer program stored thereon, the at least one computer program that when executed on the processor, causes the processor to:
• assemble a plurality of candidate reference signal matrices corresponding to all possible combinations of channel state values;
• remove one or more candidate reference signal matrices from the plurality of candidate reference signal matrices so as to define a reduced subset of the candidate reference signal matrices;
• store the reduced subset of the candidate reference signal matrices as a compressed feed forward codebook;
• and
• transmit a reduced feed forward index selected from the stored compressed feed forward codebook.

A base station configured to compress a feed forward codebook, comprising:

• a wireless transceiver;
• logic configured to assemble a plurality of candidate reference signal matrices corresponding to all possible combinations of channel state values;
• logic configured to remove one or more candidate reference signal matrices from the plurality of candidate reference signal matrices so as to define a reduced subset of the candidate reference signal matrices;
• logic configured to store the reduced subset of the candidate reference signal matrices as a compressed feed forward codebook;
• and
• logic configured to transmit a reduced feed forward index selected from the stored compressed feed forward codebook.

A method of receiving a reduced feed forward index for use in beamforming, comprising:

• generating a compressed feed forward codebook comprising a reduced subset of a plurality of candidate reference signal matrices;
• receiving a reduced feed forward index;
• selecting a candidate reference signal matrix from the generated compressed feed forward codebook based on the reduced feed forward index;
• and
• determining a receive beamforming vector from the selected candidate reference signal matrix.

A mobile station configured to receive a reduced feed forward index for use in beamforming, comprising:

• a wireless transceiver;
• a processor;
• a non-transitory computer readable apparatus having a storage medium comprising at least one computer program stored thereon, the at least one computer program that when executed on the processor, causes the processor to:
• generate a compressed feed forward codebook comprising a reduced subset of a plurality of candidate reference signal matrices;
• receive a reduced feed forward index;
• select a candidate reference signal matrix from the generated compressed feed forward codebook based on the reduced feed forward index;
• and
• design a receive beamforming vector from the selected candidate reference signal matrix.

A mobile station configured to receive a reduced feed forward index for use in beamforming, comprising:

• a wireless transceiver;
• logic configured to generate a compressed feed forward codebook comprising a reduced subset of a plurality of candidate reference signal matrices;
• logic configured to receive a reduced feed forward index;
• logic configured to select a candidate reference signal matrix from the generated compressed feed forward codebook based on the reduced feed forward index;
• and
• logic configured to design a receive beamforming vector from the selected candidate reference signal matrix.