TY - JOUR
T1 - A Full-Duplex Quadrature Balanced RF Front End with Digital Pre-PA Self-Interference Cancellation
AU - Ginzberg, Nimrod
AU - Regev, Dror
AU - Tsodik, Genadiy
AU - Shilo, Shimi
AU - Ezri, Doron
AU - Cohen, Emanuel
N1 - Publisher Copyright:
© 1963-2012 IEEE.
PY - 2019/12
Y1 - 2019/12
N2 - 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 (PTX,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 PTX,max = 30 dBm. Measured RX loss is lower than 1.8 dB within the operating frequency band.
AB - 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 (PTX,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 PTX,max = 30 dBm. Measured RX loss is lower than 1.8 dB within the operating frequency band.
KW - Channel estimation
KW - Wi-Fi
KW - digital predistortion (DPD)
KW - full duplex (FD)
KW - quadrature balanced power amplifiers (QBPAs)
KW - self-interference cancellation (SIC)
KW - simultaneous transmit-receive (TR)
UR - http://www.scopus.com/inward/record.url?scp=85077969836&partnerID=8YFLogxK
U2 - 10.1109/TMTT.2019.2944814
DO - 10.1109/TMTT.2019.2944814
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AN - SCOPUS:85077969836
SN - 0018-9480
VL - 67
SP - 5257
EP - 5267
JO - IEEE Transactions on Microwave Theory and Techniques
JF - IEEE Transactions on Microwave Theory and Techniques
IS - 12
M1 - 8897729
ER -