DC offsets in direct-conversion receivers: characterization and implications

Svitek, R.; Raman, Sanjay

doi:10.1109/mmw.2005.1511916

Cited by 93 publications

(32 citation statements)

References 3 publications

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“…[26]. The DC-offset can effortlessly saturate succeeding amplification stages [27]. It is a DC signal appearing at the mixer output is composed of a static and a dynamic part, primarily due to LO self-mixing processes and in-band interfering signals.…”

Section: The Realistic Implementation Oriented Model (R-model)mentioning

confidence: 99%

Performance Evaluation of Different Spectrum Sensing Techniques for Realistic Implementation Oriented Model in Cognitive Radio Networks

Patil¹,

Wadhai²

2014

IJWMN

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In this paper, the performance assessment of five different detection techniques from spectrum sensing perspective in cognitive radio networks is proposed and implemented using the realistic implementation oriented model (R-model) with signal processing operations. The performance assessment of the different sensing techniques in the existence of unknown or imprecisely known impulsive noise levels is done by considering the signal detection in cognitive radio networks under a non-parametric multisensory detection scenario. The examination focuses on performance comparison of basic spectrum sensing mechanisms as, energy detection (ED) and cyclostationary feature detection (CSFD) along with the eigenvalue-based detection methods namely, Maximum-minimum eigenvalue detection (MMED), Roy's largest Root Test (RLRT) which requires knowledge of the noise variance and Generalized Likelihood Ratio Test (GLRT) which can be implemented as a test of the largest eigenvalues vs. Maximum-likelihood estimates a noise variance. From simulation results it is observed that the detection performance of the GLRT method is better than the other techniques in realistic implementation oriented model.

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Section: The Realistic Implementation Oriented Model (R-model)mentioning

confidence: 99%

Performance Evaluation of Different Spectrum Sensing Techniques for Realistic Implementation Oriented Model in Cognitive Radio Networks

Patil¹,

Wadhai²

2014

IJWMN

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“…한편, DCR(direct conversion receiver) 구조는 저 전력 특 성과 높은 집적도를 가지며, 대량 생산이 수월한 장점을 가지고 있다 [6]～ [8] . 이러한 DCR 구조의 장점은 차세대 무 선 통신 기기의 전력 소모와 부피를 줄일 수 있어 DCR 구조에 대한 관심히 매우 높아지고 있다.…”

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Design and Performance Evaluation of In-Band Full-Duplex System Based on Direct Conversion Receiver

Keum¹,

An²,

Ryu³

2014

The Journal of Korean Institute of Electromagnetic Engineering

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In this paper, we propose and design IBFD system based on DCR. And then, we analyze effect of DC offset by self-interference in the proposed system. Also, we evaluate BER performance of the proposed system according to DC offset. As a result of the simulation, we can confirm that when the self-interference is not completely cancelled by the RF cancellation, linearity of desired signal and self-interference is distorted by DC offset. Also, in the proposed system using m-QAM modulation, DC offsets of multi-level are caused by self-interference with m-QAM modulation. As a result, constellations of desired signal and self-interference are greatly distorted. In contrast, in the proposed system using m-PSK modulation, DC offset of single level is caused by self-interference with m-PSK modulation. In this condition, we confirm that distortion of constellations of desired signal and self-interference is less than when using m-QAM modulation. That is, we can confirm that m-PSK modulation is effective than m-QAM modulation in DCR based IBFD system. Also, we can confirm that it is important to cancel self-interference as much as possible in RF-stage.

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“…However, high-pass filters usually demand prohibitively large capacitors and fail to track the dynamic dc offset. Other methods to mitigate the dc offset include subharmonic or superharmonic mixing and offset calibration techniques at the baseband [3].…”

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confidence: 99%

Analysis and Compensation of DC Offset in OFDM Systems Over Frequency-Selective Rayleigh Fading Channels

Yih

2009

IEEE Trans. Veh. Technol.

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Abstract-Direct-conversion receivers have become popular in radio-frequency (RF) circuit design for their advantages of low cost, low power consumption, and fewer chip components over other architectures such as heterodyne receivers. However, the direct-conversion receiver architecture often suffers from direct current (dc) offset, which is a consequence of the imperfect direct-conversion process. In this paper, we study the effects of dc offset on the symbol error rate (SER) performance of orthogonal frequency-division multiplexing (OFDM) systems in multipath Rayleigh fading channels. Since OFDM system performance is sensitive to carrier frequency offset (CFO), the CFO must be estimated and compensated at the receiver. Due to CFO compensation, the dc offset caused by direct-conversion receivers and/or mixed-signal circuits no longer only affects the dc subcarrier and is spread over all subcarriers. By deriving the analytical SER formulas for OFDM systems with various modulation formats, the dependency of SER on dc offset and CFO is clearly quantified. These SER formulas can help system designers determine suitable specifications of RF components and understand whether digital dc offset compensation is necessary or not. Finally, we propose and analyze a simple dc offset estimation and cancellation scheme under the assumption that dc offset holds constant in one OFDM symbol duration. Numerical results demonstrate the effectiveness of the proposed dc offset-cancellation scheme.Index Terms-Carrier frequency offset (CFO), direct current (dc) offset, interference cancellation, orthogonal frequencydivision multiplexing (OFDM), performance analysis, Rayleigh fading, symbol error rate (SER).

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DC offsets in direct-conversion receivers: characterization and implications

Cited by 93 publications

References 3 publications

Performance Evaluation of Different Spectrum Sensing Techniques for Realistic Implementation Oriented Model in Cognitive Radio Networks

Performance Evaluation of Different Spectrum Sensing Techniques for Realistic Implementation Oriented Model in Cognitive Radio Networks

Design and Performance Evaluation of In-Band Full-Duplex System Based on Direct Conversion Receiver

Analysis and Compensation of DC Offset in OFDM Systems Over Frequency-Selective Rayleigh Fading Channels

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