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Study on the comparison between MIMO and phased array antenna

机译：MIMO与相控阵天线的比较研究

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摘要

By comparing the principle of phased array antenna (PAA) with that of MIMO (Multiple-Input Multiple-Output), it could be found that there are full of inter-contradictions between MIMO and PAA theories. According to Shannon formula, each independent Rayleigh fading channel (IRFC) is determined by the bandwidth and the carrier frequency, or spectrum. In the PAA systems, though all signals are transmitted with the same carrier frequency, some IRFCs still could be achieved by the space division multiplexing (SDM). However the IRFC constructed by each pair of the transmitting and receiving antennas in MIMO systems only could be defined as a virtual IRFC (VIRFC) since the PAA technique is not used in the systems. Moreover, these VIRFCs are almost impossible to be transformed to IRFCs in receiver. Due to the existing of VIRFCs and the non-using of PAA technique, the transmitting beam without required direction would be introduced in MIMO syutem. In consequence, many blind spots of radio coverage and an unreasonable wireless communication system would be formed. It would be pointed out in the paper that the definition of IRFC in MIMO theory is inappropriate, which makes the channel capacity derived by MIMO theory in mathematics is difficult to be achieved in implementations.
机译：通过将相控阵天线（PAA）的原理与MIMO（多输入多输出）的原理进行比较，可以发现MIMO和PAA理论之间存在许多相互矛盾的地方。根据Shannon公式，每个独立的瑞利衰落信道（IRFC）由带宽和载波频率或频谱确定。在PAA系统中，尽管所有信号都以相同的载波频率传输，但某些IRFC仍可以通过空分复用（SDM）实现。但是，由于在系统中未使用PAA技术，因此只能将由MIMO系统中的每对发送和接收天线构造的IRFC定义为虚拟IRFC（VIRFC）。而且，这些VIRFC在接收器中几乎不可能转换为IRFC。由于VIRFC的存在和不使用PAA技术的缘故，在MIMO系统中将引入不需要方向的发射波束。结果，将形成无线电覆盖范围的许多盲点和不合理的无线通信系统。需要指出的是，MIMO理论中对IRFC的定义是不合适的，这使得MIMO理论在数学上得出的信道容量难以在实现中实现。

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  • 来源
    《》|2012年|p.478- 482|共5页
  • 会议地点 Kuala Lumpur(MY)
  • 作者

    Haiyang Fu; Hui Fang; Shike Cao; Min Lu;

  • 作者单位

    College of Telecommnication and Information Engineering, Nanjing University of Posts and Telecommunications, 210003, China;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 电气化、电能应用;
  • 关键词

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