Journals Information
Universal Journal of Communications and Network(CEASE PUBLICATION) Vol. 3(1), pp. 7 - 14
DOI: 10.13189/ujcn.2015.030102
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Effect of Variable Cyclic Prefix Length on OFDM System Performance over Different Wireless Channel Models
Amar A Al-jzari 1,*, Ivica Kostanic 1, Khalid Hassan Mohamed Mabrok 2
1 Department of Electrical and Computer Engineering, Florida Institute of Technology, USA
2 Department of Electronic Engineering,University of Garden City,Khartoum, Sudan
ABSTRACT
A Cyclic Prefix (CP) is a significant feature of an OFDM waveform. It is used to completely eliminate both Inter-Symbol Interference (ISI) and Inter-Carrier Interference (ICI) as long as the CP length is greater than the channel delay spread. By eliminating both ISI and ICI, the CP compensates for the effect of the multipath dispersion; but it consumes a considerable amount of the scarce spectrum and the power. Conventional OFDM uses a fixed and large CP length to overcome the ISI caused by channel delay spread under wireless mobile environment. This approach may degrade the overall spectral efficiency as well as consumes relatively more transmitter energy. Therefore, there is a need to adopt the CP length according to instantaneous channel parameters. In this paper, we presented a method for investigating the effect of varying the CP length on OFDM system performance over different multipath channel models. We estimated the variable CP length based on the RMS delay spread of the channels鈥� power delay profile (PDP). According to this method, the estimated CP length optimizes the system capacity and improves the overall system performance. We showed that this approach could lead to a mathematical formula presenting the relationship between the CP length and the RMS delay spread of the channels.
KEYWORDS
Cyclic Prefix Length, OFDM System, Power Delay Profiles, RMS Delay Spread, System Capacity
Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Amar A Al-jzari , Ivica Kostanic , Khalid Hassan Mohamed Mabrok , "Effect of Variable Cyclic Prefix Length on OFDM System Performance over Different Wireless Channel Models," Universal Journal of Communications and Network(CEASE PUBLICATION), Vol. 3, No. 1, pp. 7 - 14, 2015. DOI: 10.13189/ujcn.2015.030102.
(b). APA Format:
Amar A Al-jzari , Ivica Kostanic , Khalid Hassan Mohamed Mabrok (2015). Effect of Variable Cyclic Prefix Length on OFDM System Performance over Different Wireless Channel Models. Universal Journal of Communications and Network(CEASE PUBLICATION), 3(1), 7 - 14. DOI: 10.13189/ujcn.2015.030102.