4.5 A 64Gb/s 1.4pJ/b/element 60GHz 2×2-Element Phased-Array Receiver with 8b/symbol Polarization MIMO and Spatial Interference Tolerance
4.5 A 64Gb/s 1.4pJ/b/element 60GHz 2×2-Element Phased-Array Receiver with 8b/symbol Polarization MIMO and Spatial Interference Tolerance
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4.5 A 64Gb/s 1.4pJ/b/元件 60GHz 2×2 元件相控阵接收器，具有 8b/符号极化 MIMO 和空间干扰容限
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发表时间：
2020
期刊：
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通讯作者：
B. Casper
中科院分区：
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作者：
A. Chakrabarti;C. Thakkar;Shuhei Yamada;D. Choudhury;J. Jaussi;B. Casper
60 GHz频段为高速多用户连接提供14 GHz未经许可的带宽[1]。尽管有这个机会，60 GHz相控阵的吞吐量一直被限制在10.4 Gb/S[2-5]，因此可能不会比快速改进的亚7 GHz WiFi提供实质性的性能优势。虽然单元素解决方案使用了更高的符号速率、更高阶星座和/或MIMO来实现高达50.1 Gb/S的速率[6-7]，但由于没有波束形成/导向，因此支持同时多用户链路是不切实际的。此外，以前的RX[2-7]都没有表现出空间耐受干扰，这是密集频谱重用和获得高聚合信道容量的关键。为了能够实现高速每链路、波束控制和干扰容限的组合，这项工作提出了一种64 Gb/S 4单元双极化(DP)相控阵接收器(RX)(图4.5.1)，采用0.9V 28 nm CMOS工艺。直接下变频RX与DP-MIMO的DP天线集成在一起，最高可达10b/符号，具有宽基带和前端跨越57至71 GHz，并支持高达8Gsym/S的符号速率。
The 60GHz band offers 14GHz unlicensed bandwidth for high-speed, multi-user connectivity [1]. Despite this opportunity, throughput of 60GHz phased arrays has been limited to 10.4Gb/s [2-5], and therefore may not offer a substantial performance benefit over the rapidly improving sub-7GHz WiFi. While single-element solutions have used higher symbol-rates, higher-order constellations and/or MIMO to achieve rates up to 50.1Gb/s [6-7], the absence of beamforming/steering makes it impractical to support simultaneous multi-user links. In addition, none of the prior RX [2-7] have demonstrated spatial interference tolerance, which is key for dense spectral reuse and achieving high aggregate channel capacity. To enable a combination of high-speed per-link, beam steering and interference tolerance, this work presents a 64Gb/s 4-element dual-polarization (DP) phased-array receiver (RX) (Fig. 4.5.1) in a 0.9V 28nm CMOS process. The direct downconversion RX is integrated with DP antennas for DP-MIMO up to 10b/symbol, has a wide baseband and front-end spanning 57 to 71GHz, and supports symbol rates up to 8Gsym/s.