Novel System Design and Configuration for High-Speed Channel-Bonding Transmission Using Wide Bandwidth in Sub-Terahertz Bands

This paper proposes a novel system design and configuration for ultra-wideband transmission using channel bonding (CB) in sub-terahertz bands. In the CB transmission system, a transmitter generates a frequency-multiplexed signal using multiple narrowband channels, and a receiver separates individual narrowband channels from the frequency-multiplexed signal. In principle, CB transmission achieves a transmission data rate proportional to the number of multiplexed channels. However, insufficient isolation characteristics between bonded channels reduce the achievable transmission data rate with multiple channels. To address this, the proposed configuration prevents the reduction in the transmission data rate caused by power leaked to the other channels when increasing the number of bonded channels. To demonstrate a high transmission data rate, a prototype transmission system that transmits a CB signal comprising four channels with a bandwidth of 2.1 GHz each is designed and constructed based on the proposed configuration. Real-time transmissions with a total transmission data rate exceeding 100 Gbps are successfully achieved in a line-of-sight communication environment over a distance of 40 m employing three transmission systems operated in 120-GHz, 130-GHz, and 140-GHz bands each.