A Full-Duplex Quadrature Balanced RF Front End With Digital Pre-PA Self-Interference Cancellation
A Full-Duplex Quadrature Balanced RF Front End With Digital Pre-PA Self-Interference Cancellation
复制标题
具有数字预 PA 自干扰消除功能的全双工正交平衡射频前端
DOI：
10.1109/tmtt.2019.2944814
复制
发表时间：
2019
影响因子：
4.3
通讯作者：
E. Cohen
中科院分区：
文献类型：
--
作者：
Nimrod Ginzberg;D. Regev;G. Tsodik;Shimi Shilo;D. Ezri;E. Cohen
本文介绍了一种由数字自干扰消除 (SIC) 算法辅助的正交平衡射频 (RF) 前端发射器 (TX) 架构，用于在下一代全双工无线电中同时发送和接收。所提出的正交平衡功率放大器 (QBPA) 拓扑是一种四端口电路，在天线和接收器 (RX) 低噪声放大器 (LNA) 之间具有嵌入式无源初级隔离 (PI)，以及可重用 TX 增益的极低功耗 SIC 注入机制。对于 80 MHz 带宽 (BW) 上的连续波 (CW) 信号，测得的发射-接收 (TR) 隔离度 >57 dB。在 2.4 GHz Wi-Fi 频段内，80 MHz 802.11ac 正交频分复用 (OFDM) 信号的 TR 隔离度分别从 30 dBm 峰值 TX 功率 ( $P_{\text {TX,max}}$ ) 回退 10 dB 和 20 dB。应用数字预失真算法在高输出功率情况下对 TX 进行线性化，实现并发 TX-SIC 操作时误差矢量幅度 (EVM) 低于 -34.7 dB。演示了同步 TR 场景，测量了 −22 dB 的 RX 信号 EVM，而 $P_{\text {TX,max}}\,\,=$ 30 dBm。在工作频段内测得的 RX 损耗低于 1.8 dB。
This article presents a quadrature balanced radio-frequency (RF) front-end transmitter (TX) architecture assisted by a digital self-interference cancellation (SIC) algorithm for simultaneous transmission and reception in next-generation full-duplex radios. The proposed quadrature balanced power amplifier (QBPA) topology is a four-port circuit with an embedded passive primary isolation (PI) between the antenna and the receiver (RX) low-noise amplifier (LNA), along with a very low power SIC injection mechanism that reuses the TX’s gain. A transmit–receive (TR) isolation of >57 dB is measured for continuous-wave (CW) signals over an 80 MHz bandwidth (BW). A TR isolation of >50 and >56 dB is demonstrated for an 80 MHz 802.11ac orthogonal frequency-division multiplexing (OFDM) signal at 10- and 20 dB backoff from 30 dBm peak TX power ( $P_{\text {TX,max}}$ ), respectively, within the 2.4 GHz Wi-Fi band. A digital predistortion algorithm is applied to linearize the TX at the high output power case, achieving error vector magnitude (EVM) lower than −34.7 dB for concurrent TX-SIC operation. A simultaneous TR scenario is demonstrated, measuring an RX signal EVM of −22 dB, while $P_{\text {TX,max}}\,\,=$ 30 dBm. Measured RX loss is lower than 1.8 dB within the operating frequency band.
影响因子：
5.7
作者：
Laughlin L
通讯作者：
Laughlin L
具有 FDD/FD 功能、具有基带谐波预失真功能、频率范围为 800MHz 至 1.2GHz 的单天线 RF 前端
DOI：
10.1109/rfic.2018.8428984
发表时间：
2018
期刊：
2018 IEEE Radio Frequency Integrated Circuits Symposium (RFIC
影响因子：
--
作者：
Yuksel, Hazal;Tapen, Thomas;Boynton, Zachariah;Enroth, Emory;Apsel, Alyssa;Molnar, Alyosha C.
通讯作者：
Molnar, Alyosha C.