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Geographic Segmented Localcasting Co-Channel Interference Mitigation Using Iterative Joint Detection and Decoding
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DOI：10.1109/TBC.2025.3579222.png)
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Abstract
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Geographic Segmented Localcasting (GSL) is an emerging Digital Terrestrial Television Broadcast (DTTB) physical layer operating mode. The system utilizes LDM-SFN to enable both wide-area Single Frequency Network (SFN) coverage and localized broadcast/multicast services within a single Radio Frequency (RF) broadcast channel. By combining SFN (core layer) and localcasting (enhanced layer) via Layered Division Multiplexing (LDM), GSL improves spectrum efficiency but faces challenges such as co-channel interference and SFN vs. Localcasting Channel Profile Mismatch (LCPM), which limit localcasting coverage. This paper presents two receiving methods that facilitate LDPC-coded LDM signal reception. Method 1 is the Multiple localcasting signals Iterative Joint Detection and Decoding (IJDD), which can mitigate severe co-channel interference with required Channel Status Information (CSI) of nearby localcasting transmitters. Method 2 is the Constellation Rotated IJDD (CR-IJDD), which can mitigate severe LCPM without CSI. The proposed methods enable decoding of both desired and interfering signals under high SNR conditions, enhancing spectrum reuse. Additionally, an Early Extrinsic Information Exchange for LDPC Iteration Reduction (EEIE-LIR) scheme is introduced to accelerate convergence and reduce receiver complexity. Evaluations based on ATSC 3.0 ModCods demonstrate that the proposed methods significantly improve spectrum efficiency and mitigate the co-channel interferences. The proposed technologies and can be extended to other DTTB systems and cell-based broadband wireless networks (e.g., the fifth generation (5G)/the sixth generation (6G), supporting seamless integration of broadcast, multicast, and unicast services.
Keywords:
Geographic segmented localcasting (GSL)
LDM
NOMA
LDPC
DTTB
5G/6G
spectrum reused-1
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