Analysis and Compensation for Nonlinear Interference of Two High-Order Modulation Carriers over Satellite Link

被引:31
作者
Beidas, Bassel F. [1 ]
Seshadri, Rohit Iyer [1 ]
机构
[1] Hughes, Adv Dev Grp, Germantown, MD 20876 USA
关键词
Adjacent channel interference; nonlinear transponders; Volterra filters; adaptive equalizers; adaptive cancellers; satellite communication; multicarrier; PERFORMANCE; VOLTERRA; PREDISTORTION; CANCELLATION; EQUALIZATION;
D O I
10.1109/TCOMM.2010.06.080676
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
We introduce analytical characterization of the nonlinear interference that results when passing more than one high-order modulation carrier through the same nonlinear transponder high-power amplifier (HPA). A Volterra filter is proposed which is novel in its implementation of this analytical characterization and modeling of intersymbol interference (ISI) and adjacent channel interference (ACI). Our focus is on adaptive algorithms with pilot-based training so that the solutions are completely blind to unknown transponder HPA characteristics, and can rapidly respond to varying operating back-off level. Furthermore, two families of adaptive solutions are provided to compensate for nonlinear ISI and ACI. The first set performs adaptive channel inversion and then applies equalization. The second set of solutions performs adaptive channel identification and then applies cancellation. The effectiveness of the proposed analysis and techniques is demonstrated via extensive simulations for high-order QAM and APSK modulations. Also included is the coded performance with selected LDPC codes designed for the DVB-S2 standard. Finally, computational complexity is assessed and performance impact is quantified when complexity is reduced by decreasing the number of Volterra coefficients.
引用
收藏
页码:1824 / 1833
页数:10
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