首页> 外文会议>29th AIAA international communications satellite systems conference 2011 >64-QAM Communication System using Three-beam Spatial Power Combining Technology
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64-QAM Communication System using Three-beam Spatial Power Combining Technology

机译:使用三光束空间功率组合技术的64-QAM通信系统

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A satellite communication system is presented that features a novel three-beam spatial superposition, which improves the usage efficiency of frequency resources and energy. The system incorporates three quadrature phase-shift keying (QPSK) modulators and multiple high power amplifiers (HPAs) that operate in the nonlinear region with high efficiency. Their output signals are spatially combined using a specially tailored antenna array to produce a 64-QAM (quadrature amplitude-modulated) signal.The validity of the spatial superposition was verified experimentally, and the performance of a 64-QAM system using this scheme was investigated and analyzed. The system had better bit error rate (BER) performance than a conventional 64-QAM system when operated in the HPA nonlinear high efficiency region. Although superposition error is inherent to the system, theoretical transmission analysis showed that a gain error of 1 dB and a phase error of 10 degrees were acceptable. An antenna array system composed of three circular arrays embedded on multiple circles is presented for reducing the error due to combining the three beams. Beam pattern analysis showed that the gain and phase errors were satisfied over a +/-10 degree angle from the normal direction of the antenna array. An antenna array study demonstrated that the acceptable errors could be attained with the proposed circular array system and that this range is wide enough to cover satellite communication service areas. Spectral performance analysis showed that the frequency side-lobe levels were similar to those of the conventional system operated in the linear region. HPA power consumption was reduced about 50% compared with that of the conventional system. Thus, more efficient RF power amplification of 64-QAM signals can be achieved without expanding the spectral occupancy. In short, the proposed system is feasible and will enable broadband transmission with more efficient use of energy and bandwidth.
机译:提出了一种具有新颖的三光束空间叠加特征的卫星通信系统,提高了频率资源和能量的利用效率。该系统集成了三个正交相移键控(QPSK)调制器和多个在非线性区域中高效运行的高功率放大器(HPA)。使用专门定制的天线阵列在空间上组合其输出信号,以产生64-QAM(正交幅度调制)信号。通过实验验证了空间叠加的有效性,并研究了使用该方案的64-QAM系统的性能并进行分析。在HPA非线性高效区域中运行时,该系统比常规64-QAM系统具有更好的误码率(BER)性能。尽管叠加误差是系统固有的,但理论上的传输分析表明,可以接受1 dB的增益误差和10度的相位误差。为了减少由于组合三个波束而引起的误差,提出了一种由嵌入在多个圆上的三个圆形阵列组成的天线阵列系统。波束方向图分析表明,在与天线阵列法线方向成+/- 10度角的范围内,增益和相位误差得到了满足。天线阵列研究表明,使用建议的圆形阵列系统可以达到可接受的误差,并且该范围足够宽,可以覆盖卫星通信服务区域。频谱性能分析表明,频率旁瓣电平类似于在线性区域中操作的常规系统的旁瓣电平。与传统系统相比,HPA功耗降低了约50%。因此,在不扩大频谱占用的情况下,可以实现64-QAM信号的更有效的RF功率放大。简而言之,所提出的系统是可行的,并且将使宽带传输能够更有效地利用能量和带宽。

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