Optimization and Performance Limits of a 64-QAM Wireless Communication Link at 220-260 GHz in a SiGe HBT Technology
Optimization and Performance Limits of a 64-QAM Wireless Communication Link at 220-260 GHz in a SiGe HBT Technology
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采用 SiGe HBT 技术的 220-260 GHz 64-QAM 无线通信链路的优化和性能限制
DOI：
10.1109/rws.2019.8714283
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
U. Pfeiffer
中科院分区：
文献类型：
--
作者：
Pedro Rodríguez;J. Grzyb;B. Heinemann;U. Pfeiffer
我们提出了一种基于 Tx 和 Rx RF 前端模块的 1 米无线链路，工作在 220-260 GHz 的可调谐 LO 频率，通道带宽为 13.5 GHz。该模块采用 SiGe HBT 技术制造，$f_{T}/ f_{max}=350 /550$ GHz。使用的调制方案是 64-QAM。与 QPSK 或 BPSK 相比，这种高频谱效率调制需要更高程度的系统纯度。因此，对 RF 前端中的所有误差源（例如 IQ 不平衡、LO 频谱纯度以及线性度和互调产物）进行了精确校正。此后，与 41 个抽头的决策导向前馈均衡器一起，在 235 GHz 下实现了 EVM 为 8.7% 的 81 Gbps 64-QAM。使用 11.5 GHz 的带宽。由于 AWGN SNR 和相位噪声约束随调制带宽线性缩放，因此无法在 1 米距离处利用全部可用信道带宽。
We present a 1-meter wireless link based on Tx and Rx RF front-end modules working at a tunable LO frequency of 220-260 GHz with a channel BW of 13.5 GHz. The modules were manufactured in a SiGe HBT technology with $f_{T}/ f_{max}=350 /550$ GHz. The modulation scheme used was 64-QAM. This high spectral-efficiency modulation requires a higher degree of system purity than QPSK or BPSK. Therefore, an accurate correction of all error sources in the RF front-end, such as IQ imbalance, LO spectral purity, and linearity and intermodulation products, has been performed. After this, and together with a decision-directed feed-forward equalizer of 41 taps, a 81 Gbps 64-QAM with an EVM of 8.7% was achieved at 235 GHz. using a BW of 11.5 GHz. The full available channel BW could not be exploited at 1-meter distance because of AWGN SNR and phase noise constrains which scale linearly with the modulation BW.