Experimental evaluation of relative calibration in a MISO-TDD system

2017 European Conference on Networks and Communications (EuCNC) Pub Date : 2017-06-01 DOI:10.1109/EuCNC.2017.7980759

Theoni Magounaki, F. Kaltenberger, Xiwen Jiang, Cyril Buey, P. Ratajczak, F. Ferrero

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引用次数: 3

Abstract

We study the transmit time reversal beamforming in a 8x1 MISO communication system at 2.68GHz. We consider the downlink time reversal transmission where a BS communicates with one user. A prototype composed by 8 antennas and designed by Orange labs acts as the BS while the user has a single antenna. The reciprocity property is destroyed by the non-symmetric characteristics of the RF electronic circuitry. We use relative calibration which is based exclusively on signal processing techniques to solve this issue. Utilizing a controlled test setup based on OpenAirInterface, the ExpressMIMO2 SDR boards, as well as a servo controlled rail, we show the feasibility of a relative calibration method through beamforming SNR measurements. We also evaluate the performance of an antenna selection scheme at the transmit side as a low-cost low-complexity alternative to capture many of the advantages of multi-antenna systems. The measurements show that the relative calibration method is performing almost optimal and that the complexity can be significantly reduced by using antenna selection.

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MISO-TDD系统相对校准的实验评价

研究了2.68GHz下8x1 MISO通信系统的发射时间反转波束形成。我们考虑下行链路时间反转传输，其中一个BS与一个用户通信。由Orange实验室设计的由8个天线组成的原型充当BS，而用户只有一个天线。射频电路的非对称特性破坏了互易性。我们使用完全基于信号处理技术的相对校准来解决这个问题。利用基于OpenAirInterface的受控测试装置，expressmmo2 SDR板以及伺服控制导轨，我们通过波束形成信噪比测量证明了相对校准方法的可行性。我们还评估了天线选择方案在发射端的性能，作为捕获多天线系统的许多优点的低成本低复杂性替代方案。测量结果表明，相对校准方法几乎是最优的，并且通过天线选择可以显著降低相对校准的复杂性。

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2017 European Conference on Networks and Communications (EuCNC)

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