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A time interleaved block window burst orthogonal frequency division multiplexing communication system

Gomes, M. ; Silva, V. ; Conceição, F. ; Dinis, R.

Instituto de Telecomunicações, Universidade de Coimbra, Universidade Nova de Lisboa

Invention Title: Block windowed burst orthogonal frequency division multiplexing transmission method with window overlapping and time-interleaving

Patent Nr.: EP20745281

Type: Patent

Regional Coverage: EPO

Grant Status: Pending

Priority Date: 26-06-2019

Filing Date: 16-12-2021

To improve the spectral efficiency of TIBWB-OFDM, it is presented an alternative packing of the windowed OFDM component blocks that form a TIBWB-OFDM symbol. Adjacent windowed OFDM blocks are partially overlapped, instead of being juxtapose, as in original proposed TIBWB-OFDM technique. Although the proposed packing strategy enables a highly efficient spectral transmission, this is achieved at the expense of intentionally introduced interference between consecutive sub-blocks that shape a TIBWB-OFDM symbol, which deteriorates the bit error rate (BER) performance. To cope with this additional interference, avoiding BER degradation, the receiver must entail both channel equalization and inter-block interference cancellation (IBIC) between OFDM component blocks of the TIBWB-OFDM symbol. Linear or iterative frequency domain equalization (FDE) can be applied to the received signal aiming to cancel out channel impairments, as for conventional TIBWB-OFDM without windowing time overlapping. In order to mitigate inter-block interference, a two-way (i.e. simultaneously forward and backward) interference successive cancellation (ISC) is proposed. While ISC can also be made iterative enabling better interference cancellation when combined with linear FDE, the IBIC procedure can be simplified after the initial iteration when this is combined with iterative FDE. Therefore, it is proposed a set of different receiver embodiments (iterative and non-iterative) for detection of TIBWB-OFDM with windowing overlapping.