AN OFDM RECEIVER WITH FREQUENCY OFFSET CORRECTION

A system for use with an OFDM-receiver. The system comprising a frequency-offset-correction-block; and a sub-band-demapping-block. The sub-band-demapping-block is configured to receive an input-signal and determine within the input signal: one or more allocated-frequency-sub-bands allocated to convey an information-signal (PSS, SSS and BCH); and one or more unallocated-frequency-sub-bands. The sub-band-demapping-block can then provide the allocated-frequency-sub-bands and the unallocated-frequency-sub-bands to the frequency-offset-correction-block. The frequency-offset-correction-block is configured to: receive a frequency-offset-estimation-signal representative of a frequency-offset-error of the input-signal relative to a local oscillator of the OFDM-receiver; and apply a frequency-correction-algorithm to the allocated-frequency-sub-bands and at least a subset of the unallocated-frequency-sub-bands, based on the frequency-offset-estimation-signal, to produce a frequency-corrected-signal which compensates for the frequency-offset-error of the input-signal. Even though in Sidelink synchronization subframes there is no data allocated to the neighbouring unallocated-subcarriers, a frequency-offset-correction block can use them to improve the frequency offset robustness of BCH decoding. The reason is that in case of frequency-offset-error, energy leaks onto these unallocated-subcarriers. By including them in a frequency offset correction input, the energy that leaked onto them can advantageously be harvested. As a result, the BCH decoding performance can be improved substantially.