IMPROVEMENT OF CHANNEL CAPACITY IN COGNITIVE RADIO SYSTEMS BASED ON OFDM

  • Nguyen Van Vinh Hung Yen University of Technology and Education
  • Do Ngoc Uoc Hung Yen University of Technology and Education
Keywords: Cognitive Radio (CR), Orthogonal Frequency Division Multiplexing (OFDM), Power Allocation, Subcarrier Side Lobe

Abstract

The spectrum-sharing access model in the cognitive radio system consists of two main models, the Overlay model and the Underlay model. In this paper, a power overlay scenario based on the overlay model is proposed based on the traditional Iterative Partitioned Water-filling (IPW) algorithm. This scenario applies to protected and reasonably allocated bandwidth between sub-channels where the Primary User (PU) and the Secondary User (SU) are placed adjacent. This scenario not only maximizes the user capacity of the secondary SU, but also reduces the power leakage of sub-carrier users of the PU

References

Zhao Q, Sadler B., A survey of dynamic spectrum access, signal processing, networking, and regulatory policy. IEEE Signal Processing Magazine, 2007, 55 (5), pp. 2294-2309.

Haykin S., Cognitive radio: Brain-empowered wireless communications. IEEE Journal on Selected A reas in Communications, 2005, 23 (2), pp. 201- 220.

Mitola J., Cognitive radio for flexible mobile multimedia communications. Proc IEEE International Workshop on Mobile Multimedia Communications, San Diego: IEEE Press. 1999, pp.3-10.

Weiss T, Jondral F., Spectrum pooling: An innovat ive strategy for the enhancement of spectrum efficiency. IEEE Communications Magazine, 2004, 42 (3), pp. S8-S14.

Wang P, Zhao M, Xiao L, etal., Power allocation in OFDM-based cognitive radio systems. Proc IEEE Global Communication Conference Wasshington DC: IEEE Press, 2007, pp. 4061-4065.

Weiss T, Hillenbrand J, Krohn A, etal., Mutual interference in OFDM-based spectrum pooling systems. Proc IEEE Vehicular Technology Conference Spring, Milan: IEEE Press. 2004, pp. 1873- 1877.

S Boyd, L Vandenberghe, Convex Optimization. Cambridge, UK: Cambridge University Press,2004.

Nguyễn Văn Vinh, Tối ưu hóa thuật toán IPW ở hệ thống vô tuyến nhận thức dựa trên OFDM. Tạp chí Khoa học và Công nghệ, trường Đại học Sư phạm Kỹ thuật Hưng Yên, 2016, 10 (06), tr.45-49.

Published
2018-04-11
How to Cite
Nguyen Van Vinh, & Do Ngoc Uoc. (2018). IMPROVEMENT OF CHANNEL CAPACITY IN COGNITIVE RADIO SYSTEMS BASED ON OFDM. UTEHY Journal of Science and Technology, 17, 44-49. Retrieved from http://tapchi.utehy.edu.vn/index.php/jst/article/view/127