Flexible Fast-Convolution Processing for Cellular Radio Evolution

Orthogonal frequency-division multiplexing (OFDM) has been selected as a baseline waveform for long-term evolution (LTE) and fifth-generation new radio (5G NR). Fast-convolution (FC)-based frequency-domain signal processing recently considered an effective tool transmitter receiver side subband filtering of OFDM-based waveforms. However, the original continuous FC-based model, can, in general, be configured time-direction only with granularity half subframe, corresponding to 7, 14, or 28 symbols 15kHz, 30kHz, 60kHz subcarrier spacing, respectively. In this paper, we present symbol-synchronous FC-processing scheme flexibly allowing filter re-configuration time resolution equal one OFDM symbol while supporting tight carrier-wise 5G NR mixed-numerology scenarios adjustable spacings, center frequencies, bandwidths, well providing co-existence LTE. Proposed approach segments each stream time-domain into overlapping blocks fixed size. Symbol synchronous is achieved by dynamically adjusting overlap between aligning payload part boundaries symbols. The proposed demonstrated support envisioned use cases provide flexible starting point sixth generation (6G) development.