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The Walsh Domain: Open New Dimensions for Next-Generation RF Systems [Feature]
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DOI：10.1109/mcas.2026.3683017.png)
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Abstract
En 中文
Future wireless systems are expanding toward multi-gigahertz (GHz) bandwidths and sub-terahertz (THz) frequencies. Conventional solutions struggle with high sampling rates, strong nonlinearities, and the diminishing efficiency gains of analog circuits in complementary metal-oxide-semiconductor (CMOS) technologies. Wideband radio-frequency (RF) architectures require a new signal representation and processing paradigm to address these challenges, enabling energy-efficient wideband access and linearization. The Walsh sequency domain offers such an opportunity: its orthogonal basis enables highly parallel and energyefficient wideband operations, reducing RF signal-processing complexity while remaining fully compatible with CMOS technologies. Operating directly in the Walsh domain allows compact implementations of RF conversion, channelization, and nonlinear compensation. These capabilities have been experimentally demonstrated through proof-of-concept integrated circuits in CMOS fully depleted silicon-on-insulator (FDSOI) technologies, including GHz-range RF conversion, digital pre-distortion (DPD), and channel-aggregation techniques. Furthermore, a Walshnative end-to-end wireless autoencoder shows improved robustness to amplifier nonlinearities while benefiting from reduced sampling requirements. Walsh-based RF processing opens a new design space for multi-GHz bandwidth, energy-efficient, and hardware–algorithm co-design in next-generation artificial intelligence (AI)-assisted communication systems.
Keywords:
Walsh sequency domain
ultra-wideband Wireless Communication
CMOS RF integrated circuits
digital predistortion
Al wireless autoencoder
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