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该论文提出了一种400-900 MHz的宽带宽直接变频谐波抑制接收机，采用双域谐波抑制和自适应干扰消除技术，旨在解决传统谐波抑制方案因幅度和相位失配导致抑制能力有限（30-40dB）的问题，实现了60-100dB所需的高谐波抑制，以应对强干扰并将谐波响应降至噪声基底。
Wideband direct-conversion harmonic-rejection (HR) receivers for softwaredefined radio aim to remove or relax the pre-mixer RF filters, which are inflexible, bulky and costly [1,2]. HR schemes derived from [3] are often used, but amplitude and phase mismatches limit HR to between 30 and 40dB [1,2]. A quick calculation shows that much more rejection is wanted: in order to bring harmonic responses down to the noise floor (e.g. -100dBm in 10MHz for 4dB NF), and cope with interferers between -40 and 0dBm, an HR of 60 to 100dB is needed. Also in terrestrial TV receivers and in applications like DVB-H with co-existence requirements with GSM/WLAN transmitters in a small telephone, high HR is needed. In this work, an architecture aiming for >80dB HR is shown in Fig.12.9.1. It consists of an analog front-end followed by adaptive interference cancellation (AIC) in the digital domain. AIC is known for its ability to adapt to and mitigate
Niels A. Moseley, Zhiyu Ru, Eric A. M. Klumperink, Bram Nauta
University of Twente, Enschede, Netherlands