Codebook design and structure for advanced wireless communication systems

A base station capable of communicating with a user equipment (UE), the base station comprising:

• a transmitter configured to:
• transmit downlink signals indicating precoder codebook parameters, the downlink signal including:
• first and second quantities of antenna ports indicating respective quantities of antenna ports in first and second dimensions;
• first and second oversampling factors indicating respective oversampling factors for c Discrete Fourier Transform (DFT) beams in the first and second dimensions;
• either at least one beam group configuration among a plurality of beam group configurations or first and second quantities of beams indicating respective quantities of beams in the first and second dimensions forming a beam group;
• and
• first and second beam skip numbers indicating respective differences of leading beam indices of two adjacent beam groups in the first and second dimensions;
• and
• a receiver configured to:
• receive uplink signals containing a plurality of precoding matrix indicators (PMIs) from the UE;
• and
• determine a precoder, using the received PMIs.

A method of operating a base station capable of communicating with a user equipment (UE), the method comprising:

• transmitting downlink signals indicating precoder codebook parameters, the downlink signal including:
• first and second quantities of antenna ports indicating respective quantities of antenna ports in first and second dimensions;
• first and second oversampling factors indicating respective oversampling factors for Discrete Fourier Transform (DFT) beams in the first and second dimensions;
• either at least one beam group configuration among a plurality of beam group configurations or first and second quantities of beams indicating respective quantities of beams in the first and second dimensions forming a beam group;
• and
• first and second beam skip numbers indicating respective differences of leading beam indices of two adjacent beam groups in the first and second dimensions;
• receiving uplink signals containing a plurality of precoding matrix indicators (PMIs) from the UE;
• and
• determining a precoder, using the received PMIs.