In this paper, we focus on designing an unified deep neural demodulation network for recovering multiple QAM signals, which can adapt to the adaptive QAM modulation signal. We specifically introduce the convolution block, identity block, self-attention block to extract the input complex signal feature, such that the unified demodulation network can jointly decide the modulation type and symbol constellation index. In the meanwhile, our proposed demodulation network can compensate the time and frequency offset induced by the channel and receiver oscillator. We evaluate the symbol error rate (SER) of our proposed demodulation network for BPSK, QPSK, and 8QAM signals in AWGN, Nakagami and Rician channels under different constellation mapping schemes. Simulation results show that, even when the constellation graph overlaps with each other for BPSK, QPSK, and 8QAM signals, for AWGN channel, the SER of our proposed unified demodulation network can approach the theoretical bound. While for the Nakagami and Rician channels, our proposed demodulation network can also provide a competitive SER performance.
Unified Deep Neural Demodulation Network Design for QAM Signal Recovery
2023-10-10
988925 byte
Conference paper
Electronic Resource
English
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