Delta-sigma noise shaping in 2D spacetime for uniform linear aperture array receivers
Delta-sigma noise shaping in 2D spacetime for uniform linear aperture array receivers
复制标题
均匀线性孔径阵列接收器的二维时空 Delta-Sigma 噪声整形
DOI：
10.1109/mercon.2016.7480125
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
L. Bruton
中科院分区：
文献类型：
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作者：
Suranga Handagala;A. Madanayake;L. Belostotski;L. Bruton
提出了一种基于Delta-sigma调制的多维噪声整形方法。这种方法将增量-西格玛调制扩展到二维(2-D)情况(空间、时间)。所提出的噪声整形方法采用无损离散积分器在微波和毫米波阵列处理系统中实现。文中指出，二维噪声整形减少了期望的阵列信号与噪声的频谱重叠。通过减小ROSS的重叠，可以使用二维滤波来改善阵列接收器的整体噪声系数。在输入信噪比为10d B、低噪声噪声系数为5 d B的情况下，对于具有65个模拟单元的4次空间过采样阵列，可以模拟出2.6d B的噪声系数改善。对33、65、129和257个单元天线阵上的宽带信号分别进行了2、4和8倍过采样的仿真结果表明，该系统具有改善整体噪声系数的潜力。尽管数学建模显示了接收器噪声系数的潜在改善，但射频集成电路的实现是具有挑战性的，并且还没有被尝试。
A multi-dimensional noise-shaping method based on delta-sigma modulation has been proposed. This method extends delta-sigma modulation into the two-dimensional (2-D) case (space, time). The proposed noise-shaping method employs lossless discrete integrators for realization in microwave and mm-wave array processing systems. The paper shows that 2-D noise-shaping reduces the spectral overlap of a desired array signal with that of noise. By reducing the overlap of the ROSs, 2-D filtering can be used to improve the overall noise figure of the array receiver. A noise figure improvement of 2.6 dB could be simulated for a 4-times spatially over-sampled array with 65 simulated elements for an input signal to noise ratio of 10 dB and LNA noise figure of 5 dB. Simulation results based on wideband signals on 33, 65, 129 and 257 element antenna arrays with 2, 4 and 8 times oversampling show the potential capability of the proposed system in improving overall noise figure. Although mathematical modeling shows potential improvements in receiver noise figure, RF integrated circuit realizations are challenging and have not been attempted yet.