Method and system for channel state information feedback using sub-codebook based trellis coded quantization

A method, by a receiver, comprising:

• receiving a signal from a transmitter, via a communication channel between the receiver and the transmitter;
• estimating parameters associated with the channel based on the received signal;
• obtaining magnitude information from the estimated parameters;
• converting the magnitude information from Rayleigh distribution to uniform distribution;
• applying a trellis coded quantization (TCQ) scheme to the converted magnitude information by mapping each sub-codebook index of a set of sub-codebook indices to output bits of each trellis branch in order to make the distance between sub-codebooks maximally equal;
• and
• transmitting a channel state information (CSI) measurement feedback to the transmitter, the CSI measurement feedback based on the TCQ scheme and comprising one or more of:
• a beginning state, input bits to the TCQ scheme, and a sub-codebook index.

A wireless device comprising:

• a receiver;
• a processor;
• and
• a non-transitory memory storing machine executable instructions, which when executed by the processor, configure the device for:
• receiving a signal from a transmitter, via a communication channel between the receiver and the transmitter;
• estimating parameters associated with the channel based on the received signal;
• obtaining phase information from the estimated parameters;
• applying a trellis coded quantization (TCQ) scheme to the obtained phase information by mapping each sub-codebook index of a set of sub-codebook indices to output bits of each trellis branch making the distance between sub-codebooks maximally equal;
• and
• transmitting a channel state information (CSI) measurement feedback to the transmitter, the CSI measurement feedback based on the TCQ scheme and comprising one or more of:
• a beginning state, input bits to the TCQ scheme, and a sub-codebook index.