Communication techniques using quasi-static properties of wireless channels

A method of wireless communication, implemented at a wireless communication apparatus in a wireless communication system, the method comprising:

• receiving a set of pilots over a transmission channel between the wireless communication apparatus and a far-end communication apparatus, the transmission channel comprising a first portion that is time-invariant and a second portion that is time-variant;
• processing the received set of pilots to generate an estimate of the first portion;
• processing the received set of pilots to generate an estimate of the second portion;
• and
• performing a communication based on a channel state information that is a weighted combination of a first term based on the estimate of the first portion and a second term based on the estimate of the second portion,
• wherein a plurality of transmission channels comprises the transmission channel, wherein a plurality of far-end communication apparatuses comprises the far-end communication apparatus, wherein each of the plurality of transmission channels is between the wireless communication apparatus and a corresponding one of the plurality of far-end apparatuses, wherein each of the plurality of transmission channels is estimated based on different pilot and/or reference signals assigned to the corresponding far-end apparatus, and
• wherein (i) each of the different pilot signals is supported in a delay-Doppler plane, and wherein at least a portion of the delay-Doppler plane supporting a first pilot signal does not overlap the delay-Doppler plane supporting a second pilot signal, or (ii) the different pilot signals from the corresponding far-end communication apparatus received at the wireless communication apparatus have a pairwise non-zero correlation among each other.

A wireless communication apparatus, comprising a processor, a memory and a transceiver circuitry, wherein the processor is configured for:

• receiving, using the transceiver circuitry, a set of pilots over a transmission channel between the wireless communication apparatus and a far-end communication apparatus, the transmission channel comprising a first portion that is time-invariant and a second portion that is time-variant;
• processing the received set of pilots to generate an estimate of the first portion;
• processing the received set of pilots to generate an estimate of the second portion;
• and
• performing, using the transceiver circuitry, a communication based on a channel state information that is a weighted combination of a first term based on the estimate of the first portion and a second term based on the estimate of the second portion,
• wherein a plurality of transmission channels comprises the transmission channel, wherein a plurality of far-end communication apparatuses comprises the far-end communication apparatus, wherein each of the plurality of transmission channels is between the wireless communication apparatus and a corresponding one of the plurality of far-end apparatuses, and wherein the processor is further configured for:
• estimating, for each of the plurality of far-end communication apparatuses, a channel factor, wherein the channel factor is based on a ratio between a metric associated with the estimate of the first portion and a metric associated with the estimate of the second portion,
• classifying the plurality of far-end communication apparatuses into at least two groups based on values of the channel factor for each of the plurality of far-end communication apparatuses, and
• assigning different amount of transmission resources to pilot signal transmissions in the wireless communication system to each group based on the values of the channel factors for the far-end communication apparatuses in that group.