Multilevel Pulse-Position Modulation Based on Balanced Incomplete Block Designs

被引:0
作者
Noshad, Mohammad [1 ]
Brandt-Pearce, Maite [1 ]
机构
[1] Univ Virginia, Charles L Brown Dept Elect & Comp Engn, Charlottesville, VA 22904 USA
来源
2012 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM) | 2012年
关键词
Multilevel modulation; pulse position modulation (PPM); balanced incomplete block design (BIBD); free space optical (FSO) systems; spectral-efficiency; PPM; PERFORMANCE; SYSTEMS;
D O I
暂无
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this paper, two new modulation schemes using multilevel pulse-position modulation (PPM) for application in unipolar optical wireless systems are presented. Balanced incomplete block designs (BIBD) are used for constructing the symbol alphabets. Each symbol is obtained by combining multiple codewords of a BIBD code. In one scheme the symbols have equal energies, and therefore, no threshold is needed to make a decision on the received signal. The other modulation has better performance yet higher complexity. Since cyclic BIBDs are used for constructing the symbols, the transmitters and receivers have simple structures, and can be implemented using shift registers. These schemes can achieve high spectral-efficiencies, and are therefore suitable for systems with bandlimited sources or highly dispersive channels, where intersymbol interference (ISI) has a significant impact on the performance. We also show that using the same receiver structure, the constellation size can be increased by including the complements of the codewords. The performance of the proposed schemes are compared to other modulation schemes for both LED-based non-dispersive and dispersive free-space optical (FSO) systems.
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页码:2930 / 2935
页数:6
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