A Frequency Interleaver Scheme with Cyclic Shift for LTE-based 5G Terrestrial Broadcasting

Third Generation Partnership Project (3GPP) is currently advancing LTE-based 5G terrestrial broadcast technology. The application of interleaving to LTE-based 5G terrestrial broadcasting was proposed in the Release 16 discussions. Although there was no consensus among researchers due to insufficient consideration and validation, the enhancement of frequency interleaver for LTE-based 5G terrestrial broadcasting is evident to all. This paper focuses on the frequency interleaver schemes in rooftop reception scenarios. Firstly, we briefly introduce the two mainstream interleaving structures in Release 16(Rel-16), ICBI and TSBI, and then focus on the fading situation under the multipath channel, and propose the frequency interleaver schemes with additional cyclic shifts based on the two frequency interleaver schemes for the possible existence of periodic fading under the multipath channel. Extensive analysis and simulations show that the proposed cyclic shifts improve the performance of the ICBI scheme by 0.9 dB and the TSBI scheme by 1.5 dB when transport block size (TBS) is 46888. And the cyclic shifts enhance the performance of the ICBI scheme by 0.3dB and the TSBI scheme by 2.0 dB at TBS=76208 under the tapped delay line (TDL) channel type-B (TDL-B) channel model. Therefore, the additional cyclic shifts can improve the performance of frequency interleaver schemes, and potential alternatives can be proposed on this basis for future enhanced broadcasting in 3GPP standards.