iosr-JECE   Volume-13 ~ Issue-6 ~ Nov-Dec 2018

Abstract: Multiple-input multiple-output (MIMO) wireless technology in combination with orthogonal frequency division multiplexing (MIMO-OFDM) is an attractive air-interface solution for next generation wireless local area networks (WLANs), wireless metropolitan area networks (WMANs), and fourth-generation mobile cellular wireless systems. MIMO system increases the diversity gain or to enhance the system capacity on time-variant and frequency-selective channels, OFDM may be combining with multiple transmitter antenna and receiver antenna, thus resulting to MIMO- OFDM system. MIMO-OFDM, a new wireless 4G technologies, has capability of enhance data rate transmission and robustness against multi-path fading. This paper, provides an overview of the basics of MIMO-OFDM technology

Index Terms - MIMO-OFDM system, Energy and Bit Allocation, BER Performance.

[1]. Bansal, P. & Brzezinski, A. (2001). Adaptive loading in MIMO/OFDM Systems, EEE359 project, Stanford University.
[2]. Bölcskei, H. Gesbert, D. & Paul raj, A. J. (2002). "On the Capacity of OFDM-Based Spatial Multiplexing Systems," IEEE Trans. Common., vol. 50, no. 2, Feb. 2002, pp. 225.
[3]. Paul Raj, A.J., Gore, D.A., & Nabar, R.U., & Bolcskei, H.(2004). An Overview of MIMO Communications -a key to gigabit wireless, IEEE Proc., 92(2), 198-218.
[4]. Stuber, G.L., Barry, J.R. McLaughlin, S.W.& Ye Li, M.A (2004). Ingram and T.G. Pratt, Broadband MIMO-OFDM wireless communications, IEEE Proc., 92 (2), 271-294,
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Abstract: One of the important factor to be considered in a communication system is its peak to average power ratio. In this paper an effective technique named Iterative Companding Transform and Filtering –Two piecewise Companding (ICTF-TPWC) is preferred which decreases the Peak to Average Power Ratio (PAPR) as well as Bit Error Rate (BER) in an Orthogonal Frequency Division Multiplexing (OFDM) signal. Here it can be seen that without conducting de-companding at the ICTF receiver it can offer improved BER. In simulations comparisons of traditional ICF technique with proposed ICTF-TPWC technique is done in which ICTF-TPWC reduces the complexity by reducing the number of Iterations when compared to ICF to reach the required PAPR with lesser complications. ICTF-TPWC scheme offers a good BER performance when compared to the traditional techniques.

Index Terms - OFDM, ICF, ICTF-TPWC, PAPR.

[1]. Yong Wang ,Chao Yang and Bo Ai, "Iterative Companding Transform and Filtering for Reducing PAPR of OFDM Signal," IEEE Transactions on Consumer Electronics,Vol.61,no.2,May 2015.
[2]. Preenu Ann P, Renu Jose, "Comparison of PAPR Reduction Techniques in OFDM systems," International Conference on Communication and Electronics Systems (ICCES),30 March 2017.
[3]. Yasir Rahmatallah and Seshadri Mohan, "Peak-To-Average Power Ratio Reduction in OFDM Systems: A Survey and Taxonomy," IEEE Communications Surveys & Tutorials, Accepted For Publication,pp.3-5,2013.
[4]. Sroy Abouty, Li Renfa, Zeng Fanzi and Fall Mangone, "A Novel Iterative Clipping and Filtering Technique for PAPR Reduction of OFDM Signals: System Using DCT/IDCT Transform," InternationalJournal of Future Generation Communication and Networking, Vol. 6, no. 1,pp.4, February, 2013.
[5]. Chau-Yun Hsu and Hsuan-Chun Liao, "PAPR reduction using the combination of precoding and Mu-Law companding techniques for OFDM systems," IEEE 11th International Conference on Signal Processing,Vol.3,2012...

Abstract: The next generation passive optical network requires a network that can provide high capacity data to meet the increase rate for high speed data. The fiber optic media has low susceptibility to electromagnetic interference hence become a choice for high capacity network. The next generation passive optical network (NGPON) stage 1 defined and standardized by ITU-T, adopted 10G passive optical network (XGPON) has one of the standard capable of meeting the demand. This standard will be used for deployment of high capacity broadband networksand mobile backhaul which will enhance high speed connectivity. This architecture is not immune to loses or signal degradation due..........

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