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Superimposed signals are anticipated to improve wireless spectrum efficiencyto support the ever-growing IoT applications. Implementing the superimposedsignal demands on ideally aligned signals in both the time and frequencydomains. Prior work applied an average carrier-frequency offset compensation tothe superimposed signal under the assumptions of homogeneous devices and staticenvironments. However, this will cause a significant signal distortion inpractice when heterogeneous IoT devices are involved in a dynamic environment.This paper presents PhyCode, which exploits the nature of varying offsetsacross devices, and designs a dynamic decoding scheme which can react to theexact offsets from different signal sources simultaneously. We implementPhyCode via a software-defined radio platform and demonstrate that PhyCodeachieves a lower raw BER compared with the existing state-of-the-art method.

PhyCode: A Practical Wireless Communication System Exploiting Superimposed Signals