Infrastructure equipment, communications devices and methods

A method of operating an infrastructure equipment forming part of a wireless communications network configured to receive data from a communications device via a communications channel between the infrastructure equipment and the communications device, the method comprising

• receiving, from the communications device, a request for a resource allocation within which the communications device is to transmit data to the infrastructure equipment,
• receiving one or more reference symbols from the communications device,
• estimating based on the received reference symbols, for each of a plurality of resource units, RUs, of the communications channel, a signal to interference and noise ratio, SINR, sequence of the communications channel, wherein each RU comprises time resources and frequency resources of the communications channel, and wherein each element of the SINR sequence is the SINR of one of the RUs of the communications channel,
• performing a first transform followed by a second transform on the SINR sequence to produce a cepstrum of the SINR sequence, the second transform being an inverse of the first transform, and
• encoding and transmitting the cepstrum to the communications device.

A communications device forming part of a wireless communications network configured to transmit data to an infrastructure equipment via a communications channel between the communications device and the infrastructure equipment, comprising

• transceiver circuitry to transmit signals to and to receive signals from the infrastructure equipment, and
• controller circuitry configured in combination with the transceiver circuitry
• to determine that the communications device has data to transmit to the infrastructure equipment,
• to transmit, to the infrastructure equipment, a request for a resource allocation within which the communications device is to transmit the data to the infrastructure equipment,
• to transmit one or more reference symbols to the infrastructure equipment, the reference symbols being for use by the infrastructure equipment in estimating, for each of a plurality of resource units, RUs, of the communications channel, a signal to interference and noise ratio, SINR, sequence of the communications channel, wherein each RU comprises time resources and frequency resources of the communications channel, and wherein each element of the SINR sequence is the SINR of one of the RUs of the communications channel, and
• to receive, from the infrastructure equipment, an encoded cepstrum of the SINR sequence, the cepstrum having been produced by the infrastructure equipment by performing a first transform followed by a second transform on the SINR sequence, the second transform being an inverse of the first transform.