Optimal Selection of Cyclic-Prefix and Sub-Carrier for OFDM Signal in Mobile Satellite Communications Channel

Abstract:

Adapted parameters of OFDM signals can bring performance improvement in mobile satellite communications. This paper firstly analyzes the effect of cyclic-prefix (CP) length and sub-carrier bandwidth on system interference and capacity. This effect can be described by a formula which consists of system capacity, CP length and sub-carrier bandwidth. Then using this formula, a method to select the optimal parameters is given. In the end, a numerical calculation is performed to figure out the optimal parameters, considering the multipath delay spread and Doppler spread in satellite channel. It comes up that in satellite channel the CP is not very effective to improve the system performance and a wider sub-carrier bandwidth is desired.

• Periodical: Advanced Materials Research (Volumes 756-759)
• Pages: 1194-1198
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.756-759.1194
• Online since: September 2013
• Authors: Bin Li, Wei Zheng, Shu Bo Ren, Jian Jun Wu
• Keywords: CP Length, Mobile Satellite Communication, Orthogonal Frequency Division Multiplexing (OFDM), Sub-Carrier Bandwidth

References

[1] R. Van Nee, and R. Prasad, OFDM for Wireless Multimedia Communications 1st, Artech House Publishers, 2000, Chaps. 3.

[2] H. Steendam, and M. Moeneclaey, Analysis and Optimization of the Performance of OFDM on Frequency-selected Time-selective Fading Channels, IEEE Trans. On Comm., Vol. 47, No. 12, December (1999).

DOI: 10.1109/26.809701

[3] P. Robertson, and S. Kaiser, The Effects of Doppler Spreads in OFDM(A) Mobile Radio Systems, Proc. IEEE VTC 50th, Vol. 1, pp.19-20, September (1999).

DOI: 10.1109/vetecf.1999.797150

[4] S. S. Das, E. De Carvalho, and R. Prasad, Performance Analysis of OFDM Systems with Adaptive Sub Carrier Bandwidth, IEEE Trans. On Wireless Comm., Vol. 7, No. 4, pp.1117-1122, April (2008).

DOI: 10.1109/twc.2008.060761

[5] S. Ahmed, and H. Arslan, Evaluation of Frequency Offset and Doppler Effect in Terrestrial RF and in Underwater Acoustic OFDM Systems, Proc. IEEE MILCOM, (2008).

DOI: 10.1109/milcom.2008.4753547

[6] I. Ali, N. Al-Dhahir, and J. E. Hershey, Doppler Characterization for LEO Satellites, IEEE Trans. On Comm., Vol. 46, No. 3, pp.309-311, March (1998).

DOI: 10.1109/26.662636

[7] B. Li, X. Luan, Y. Si, S. Ren, and J. Wu, Selection of Sub-carrier Bandwidth in OFDM based Mobile Satellite Communication, IEEE ICIST, (2012).

DOI: 10.1109/icist.2012.6221758

[8] ITU-R. M. 1225, Guidelines for Evaluation of Radio Transmission Technologies for IMT-2000, ITU, pp.38-39, (1997).