Multi-Beam RF Aperture Using Multiplierless FFT Approximation
Multi-Beam RF Aperture Using Multiplierless FFT Approximation
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使用无乘法器 FFT 近似的多波束 RF 孔径
DOI：
10.1049/el.2014.3561
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Madanayake
中科院分区：
文献类型：
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作者：
Dora Suarez;R. Cintra;F. M. Bayer;Arindam Sengupta;Sunera Kulasekera;A. Madanayake
多个独立的射频（RF）波束在通信、射电天文学、雷达和微波成像中有应用。一个$N$点的FFT应用空间上的接收机天线阵列提供$N$独立的RF波束在$\frac{N}{2}\log_2N$乘法器的复杂性。这里，提出了一种用于RF波束成形的8点FFT的低复杂度无乘法器近似，仅使用26次加法。该算法提供了八个波束，非常类似于传统的基于FFT的波束形成器的天线阵列模式，虽然没有使用乘法器。所提出的FFT类算法是有用的低功耗RF多波束接收器，在45 nm CMOS工艺在1.1 V电源合成，并验证片上使用Xilinx Virtex-6 Lx 240 T FPGA器件。CMOS仿真和FPGA实现分别指示每个独立接收模式RF波束的588 MHz和369 MHz带宽。
Multiple independent radio frequency (RF) beams find applications in communications, radio astronomy, radar, and microwave imaging. An $N$-point FFT applied spatially across an array of receiver antennas provides $N$-independent RF beams at $\frac{N}{2}\log_2N$ multiplier complexity. Here, a low-complexity multiplierless approximation for the 8-point FFT is presented for RF beamforming, using only 26 additions. The algorithm provides eight beams that closely resemble the antenna array patterns of the traditional FFT-based beamformer albeit without using multipliers. The proposed FFT-like algorithm is useful for low-power RF multi-beam receivers; being synthesized in 45 nm CMOS technology at 1.1 V supply, and verified on-chip using a Xilinx Virtex-6 Lx240T FPGA device. The CMOS simulation and FPGA implementation indicate bandwidths of 588 MHz and 369 MHz, respectively, for each of the independent receive-mode RF beams.