Transmitter, receiver and methods

An infrastructure equipment of a wireless communications network for transmitting data to and receiving data from communications devices, the infrastructure equipment comprising:

• transmitter circuitry configured to transmit signals to the communications devices via a wireless access interface,
• receiver circuitry configured to receive signals transmitted from communications devices via the wireless access interface, and
• controller circuitry configured to control the transmitter circuitry and the receiver circuitry to form the wireless access interface to transmit data represented as signals to one or more of the communications devices and to receive data represented as the signals transmitted from the one or more communications devices, the wireless access interface having a time divided structure of repeating time units, each of the repeating time units comprising a predetermined number of resource elements disposed in time and frequency, and the receiver circuitry comprises
• detector circuitry configured to detect a received signal comprising data carried by one or more Orthogonal Frequency Division Multiplexed (OFDM) symbols and to produce log-likelihood ratios from the detected received signal, and
• demodulator circuitry for recovering the data from the one or more OFDM symbols, by demodulating modulation cells recovered from sub-carriers of the one or more OFDM symbols using the log-likelihood ratios, wherein the demodulator circuitry comprises
• segmentation circuitry configured to receive the log-likelihood ratios from an integer number of the one or more of the OFDM symbols or part thereof and to form the log-likelihood ratios into segments of log-likelihood ratios,
• I/Q de-interleaver circuitry configured to receive each of the segments of log-likelihood ratios and for each segment to separate real and imaginary components of the log-likelihood ratios for the segment and to de-interleave the real components of the log-likelihood ratios of the segment differently to the imaginary components of the segment, and
• a diversity combiner circuitry configured to combine the log-likelihood ratios output from I component and Q component demodulation circuitry to demodulate the data of each segment.

A method of receiving comprising:

• detecting a received signal comprising data carried by one or more Orthogonal Frequency Division Multiplexed (OFDM) symbols, and
• generating an estimate of a modulation cell carried by one or more OFDM symbols to output log-likelihood ratios being soft decisions of I and Q components of the modulation cell,
• receiving the log-likelihood ratios from an integer number of the one or more of the OFDM symbols and forming the log-likelihood ratios into segments of log-likelihood ratios,
• receiving each of the segments of log-likelihood ratios at an I/Q de-interleaver circuitry and for each segment de-interleaving the log-likelihood ratios corresponding to real components of the modulation cells of each segment differently to the log likelihood ratios corresponding to imaginary components of the modulation cells of each segment, and
• combining the log-likelihood ratios output from the I component and Q component demodulation circuitry to demodulate the data of each segment.