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| Analysis of ADC Quantizing Affection on SER Performance of Self-interference Canceling Common-frequency Full-duplex System |
| Zhang Zhi-liang① Luo Long② Shao Shi-hai① Pan Wen-sheng① Shen Ying① Tang You-xi① |
①(National Key Lab of Communication, University of Electronic Science and Technology of China, Chengdu 611731, China)
②(Huawei Technology Co. Ltd., Shenzhen 518129, China) |
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Abstract Common-frequency full-duplex systems send and receive signals simultaneously in the same frequency. Therefore, self-interference will exist in the local receiver and interference cancellation is necessary. Digital interference cancellation is applied after Analog-to-Digital Converter (ADC) sampling. ADC bit number, Interference-to-Signal Ratio (ISR), and quantizing judgment scheme affect both interference cancellation and Symbol Error Ratio (SER). In this paper, the essential relationship among ADC bit number, ISR, and SER of Quadrature Amplitude Modulation (QAM) is analyzed; A closed-form expression of SER is developed; And simulation results are presented to support the SER expression. The simulation results show that: when ISR decreases or ADC bit number increases, SER of this kind of system decreases in large scale, and fluctuates in small scale; some fluctuations of SER are dramatic, which can approach to the SER of the system without quantization error.
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Received: 10 October 2012
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Corresponding Authors:
Shao Shi-hai
E-mail: ssh@uestc.edu.cn
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2013, Vol. 35 
