TAILIEUCHUNG - Báo cáo hóa học: " Research Article Physical Layer Built-In Security Analysis and Enhancement Algorithms for CDMA Systems"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Physical Layer Built-In Security Analysis and Enhancement Algorithms for CDMA Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 83589 7 pages doi 2007 83589 Research Article Physical Layer Built-In Security Analysis and Enhancement Algorithms for CDMA Systems Tongtong Li Qi Ling and Jian Ren Department of Electrical and Computer Engineering Michigan State University East Lansing MI 48824 USA Received 18 July 2006 Revised 23 December 2006 Accepted 20 January 2007 Recommended by Wei Li Historically developed for secure communication and military use CDMA has been identified as a major modulation and multiple-access technique for 3G systems and beyond. In addition to the wide bandwidth and low power-spectrum density which make CDMA signals robust to narrowband jamming and easy to be concealed within the noise floor the physical layer built-in information privacy of CDMA system is provided by pseudorandom scrambling. In this paper first security weakness of the operational and proposed CDMA airlink interfaces is analyzed. Second based on the advanced encryption standard AES we propose to enhance the physical layer built-in security of CDMA systems through secure scrambling. Performance analysis demonstrates that while providing significantly improved information privacy CDMA systems with secure scrambling have comparable computational complexity and overall system performance with that of conventionally scrambled systems. Moreover it is shown that by scrambling the training sequence and the message sequence separately with two independent scrambling sequences both information privacy and system performance can be further improved. The proposed scheme can readily be applied to 3G systems and beyond. Copyright 2007 Tongtong Li et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION As people are relying

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