A Multi-Level Modulation and Demodulation Scheme in 230 MHz EPDT Power Wireless Cellular Networks

In the context of the 230 MHz EPDT (Electrical-power Professional Data Transmission) wireless private network—a dedicated spectrum band for power system communications—enhancing transmission efficiency and bit error rate (BER) performance is critical. In response to the constraints of traditional modulation methods in interference-heavy and spectrum-limited settings, a differential shift keying scheme incorporating dual-layer independent coded indexing is introduced. This design builds upon the principles of carrier index modulation and code index modulation. At the transmitter, information signals are grouped and independently modulated via orthogonal Walsh code index modulation, while multi-channel signals are generated using carrier index modulation to construct independent multi-order modulation bits. At the receiver, segmented noise reduction is performed via moving average filtering, followed by demodulation based on cross-correlation values between signals. Simulations are performed in both additive white Gaussian noise (AWGN) and multipath Rayleigh fading channels to validate the system. Experimental results demonstrate that the proposed scheme achieves superior BER performance and significantly improves the bit transmission rate, making it highly suitable for the 230 MHz EPDT wireless cellular network in power systems.