A.A. Pirogov1, M.V. Khoroshaylova2, B.L. Gusev3, N.A. Polsha4
1,2 FSBEI of HE “Voronezh State Technical University” (Voronezh, Russia)
3,4 JSC RPE “Automated Communication Systems” (Voronezh, Russia)
1 pirogov.alx@gmail.com; 2 pmv2205@mail.ru; 3 gusevboris@list.ru; 4 nikitapolsha1@yandex.ru
Problem statement. In direct sequence spread spectrum communication systems, increasing the length of the pseudorandom sequence improves noise immunity but simultaneously reduces data transmission rate, degrades spectral efficiency, and complicates the receiver synchronization process. The optimal choice of the spreading factor requires a detailed quantitative analysis of these trade-offs.
Objective. This study aims to experimentally investigate the effect of spreading sequence length on energy gain, signal acquisition time, and synchronization stability in a binary phase shift keying system under a fixed frequency bandwidth and additive white Gaussian noise.
Results. A simulation model was developed in MATLAB. It was found that increasing the sequence length from 31 to 1023 chips significantly reduces the required signal-to-noise ratio to achieve a given bit error rate. However, this improvement comes at the cost of a proportional increase in the average synchronization acquisition time and a sharp rise in timing jitter instability.
Practical significance. The obtained quantitative relationships enable communication system designers to rationally choose the spreading sequence length based on priority requirements: short codes are recommended for real-time systems with strict latency constraints, while long codes are suitable for energy-constrained Internet of Things devices and operation under severe interference conditions.
The work was carried out with the financial support of the Ministry of Science and Higher Education of the Russian Federation within the framework of the state assignment "youth laboratory" № FZGM-2026-0010.
Pirogov A.A., Khoroshaylova M.V., Gusev B.L., Polsha N.A. Investigation of the effect of the signal base on energy gain and capture stability in communication with direct sequence spread spectrum // Radiotekhnika. 2026. V. 90. № 7. P. 77−82. DOI: https://doi.org/10.18127/j00338486-202607-14
- Sklyar B. Cifrovaya svyaz'. Teoreticheskie osnovy i prakticheskoe primenenie. M.: Vil'yams. 2024. 1104 s. (in Russian).
- Prokis Dzh. Cifrovaya svyaz'. M.: Radio i svyaz'. 2023. 800 s. (in Russian).
- Petrovich N.T., Razmahnin M.K. Sistemy svyazi s shumopodobnymi signalami. M.: Radio i svyaz'. 2019. 384 s. (in Russian).