Objective of this work :
- To design a complete FPGA-based uplink and downlink QPSK communication system.
- To implement efficient rate matcher and rate dematcher modules for data processing.
- To achieve high-throughput parallel data handling using an 8-bit architecture.
- To operate the system at a high-speed 500 MHz clock frequency.
- To integrate QPSK modulation and demodulation with reliable data recovery.
- To analyze the impact of carrier frequency on practical transmission data rate.
- To optimize pipeline and data flow for low-latency communication.
- To synthesize the design on Artix-7 FPGA for real hardware validation.
- To evaluate hardware performance in terms of LUTs, flip-flops, delay, and power.
- To provide a scalable architecture for future extension toward OFDM and 5G systems.
Proposed abstract:
Modern wireless communication systems such as 5G, satellite communication, IoT networks, and high-speed data links require efficient modulation and high-throughput digital processing to meet increasing performance demands. QPSK modulation is widely adopted due to its simplicity, robustness, and moderate spectral efficiency, making it suitable for practical FPGA-based implementations. However, such systems face challenges including limited transmission bandwidth, mismatch between high-speed digital processing and RF constraints, and inefficient utilization of hardware resources in existing designs. Most current implementations focus either on modulation/demodulation or coding techniques, without addressing the integration of high-speed parallel data handling with efficient hardware utilization. In this work, a complete FPGA-based communication system is developed using 4-QPSK modulation and demodulation with an 8-bit parallel data path operating at a 500 MHz system clock, achieving a peak digital throughput of 4 Gbps. The design highlights the practical limitation of transmission under a 27.77 MHz carrier frequency, emphasizing the gap between processing capability and actual communication rate. The proposed architecture focuses on pipeline optimization, synchronization, and efficient data flow to improve system performance. The novelty of this work lies in demonstrating a high-speed parallel processing architecture integrated with QPSK communication while analyzing the disparity between digital throughput and bandwidth-limited transmission, providing a scalable foundation for future OFDM-based systems. The design is implemented and functionally verified using ModelSim simulation, and further synthesized on an Artix-7 FPGA to evaluate hardware performance. Resource utilization and efficiency are analyzed in terms of LUTs, flip-flops, delay, and power consumption, showing optimized hardware usage with reliable operation. The results confirm that the proposed system achieves high-speed performance with efficient resource utilization, making it suitable for advanced communication system development.
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High-Throughput FPGA-Based Uplink and Downlink QPSK Communication System with Rate Matcher and Dematcher
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