• Venkata Sriram Kamarajugadda
• Dharmapuri Jayanth
• Karra Vinay Reddy
• Kovai Preetham Kumar
• Dr. S P Singh

In modern spread spectrum communication and radar systems, the performance of signal acquisition and interference resistance is significantly influenced by the quality of the spreading codes. This project presents a hardware-centric approach for generating 4-phase polyphase codes using a mutation-aided evolutionary process. The proposed design utilizes a 13-bit index to generate a 52-bit polyphase sequence composed of 13 symbols, each encoded in one of four discrete phase levels (0°, 90°, 180°, 270°). A mutation logic is applied to explore sequence diversity, and a simple fitness comparator selects the optimal sequence based on index-derived metrics. All components, including the sequence generator, mutation module, and fitness evaluator, are implemented using Verilog HDL and verified through RTL simulation. A synchronous Finite State Machine (FSM) controls the sequence of operations for mutation-aided optimization. Additionally, MATLAB was used to perform Autocorrelation Function (ACF) analysis on sequences of varying lengths, including the final 52-symbol output. These evaluations confirmed that the generated codes maintained a sharp correlation peak with suppressed sidelobes, supporting their effectiveness for spread spectrum use. The design demonstrates a scalable and synthesizable solution for generating low-correlation polyphase sequences, suitable for use in secure, interference-resilient communication systems.

Polyphase codes, Mutation-aided RTL design, Autocorrelation Function (ACF), 4-phase sequence generator, Genetic Algorithm.

"Mutation-Aided RTL Design of a Four-Phase Code Generator for Low-Correlation Spread Spectrum Sequences", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 5, page no.h309-h315, May-2025, Available :http://www.jetir.org/papers/JETIR2505828.pdf

"Mutation-Aided RTL Design of a Four-Phase Code Generator for Low-Correlation Spread Spectrum Sequences", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 5, page no. pph309-h315, May-2025, Available at : http://www.jetir.org/papers/JETIR2505828.pdf