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Journals / Istanbul University Journal of Electrical and Electronics Engineering / 2005 / Cilt: 5 - Sayı: 2

A new spreading code for multi-user MC-SS communication systems

Aydın AKAN
Yalçın ÇEKİÇ
Luis F. CHAPARRO
Seda ŞENAY
Pages
1411–1417
Publication Date
2022-10-18
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The performance of the proposed system is illustrated by simulations.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Multi-carrier spread spectrum (MCSS) communication systems are able to mitigate the effects of fading, interferences and Doppler frequency shifts as well as to support multiple access schemes.
📊
Key Findings & Data:It is possible to get optimum performance from MCSS systems by carefully choosing the spreading sequences.
💡
Conclusion & Impact:The performance of the proposed system is illustrated by simulations.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

Multi-carrier spread spectrum (MCSS) communication systems are able to mitigate the effects of fading, interferences and Doppler frequency shifts as well as to support multiple access schemes. It is possible to get optimum performance from MCSS systems by carefully choosing the spreading sequences. However, due to inter-user interferences, performance degrades as the number of users increases unless the transmission channels are modeled and estimated. In this paper, we present a new spreading sequence obtained from a complex quadratic sequence multiplied by a pseudo random noise sequence, thus exploiting the properties of constant envelope and statistical independence. Our approach is based on the time-frequency characterization of the wireless communication channel by means of discrete evolutionary transform. The properties of the new spreading sequence enables us to estimate the parameters of multi-user channels, both for uplink and downlink transmission cases, and design a receiver that is robust to channel noise, inter-user interference and intentional jammers. The performance of the proposed system is illustrated by simulations.

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Cite This Article

AKAN, A., ÇEKİÇ, Y., CHAPARRO, L. F., ŞENAY, S. (2022). A new spreading code for multi-user MC-SS communication systems. Istanbul University Journal of Electrical and Electronics Engineering, Cilt: 5 - Sayı: 2, 1411–1417. https://ajindex.com/articles/543832

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