Advanced digital signal processing techniques for compensation of nonlinear distortion in wideband multicarrier radio receivers

Valkama, Mikko; ghadam, Ali Shahed hagh; Anttila, Lauri; Renfors, Markku

doi:10.1109/tmtt.2006.875274

Cited by 96 publications

(92 citation statements)

References 13 publications

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“…In recent years, this concept has been proposed for use in RF receivers to remove second-order intermodulation (IM2) distortion and dc offset [1], third-order intermodulation (IM3) distortion [2], [3], and signal interference resulting from in-phase and quadrature (I-Q) mismatch in IF receiver circuitry [4], [5] and was described as a general concept in [5]. Other examples of the use of adaptive signal processing in receivers include the cancellation of error-producing signals themselves [6] and additional techniques to remove the effects of dc offset and I-Q mismatch in direct-conversion receivers [7], [8].…”

Section: Introductionmentioning

confidence: 99%

“…Because the error-cancellation schemes in [2] and [3] generate the reference IM3 distortion in the digital domain, the analog-to-digital converters (ADCs) in these systems are required to accurately digitize all IM3-producing signals. In many applications, such as in commercial Universal Mobile Telecommunications System (UMTS) receivers, the range of frequencies over which IM3-producing signals may occur is well over an order of magnitude greater than the bandwidth of the desired signal, substantially increasing the required area and power dissipation of the ADCs beyond what the original receiver required.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Internally Bandlimited Multistage Cubic-Term Generators for RF Receivers

Keehr

Hajimiri

2009

IEEE Trans. Circuits Syst. I

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Abstract-Adaptive feedforward error cancellation applied to correct distortion arising from third-order nonlinearities in RF receivers requires low-noise low-power reference cubic nonidealities. Multistage cubic-term generators utilizing cascaded nonlinear operations are ideal in this regard, but the frequency response of the interstage circuitry can introduce errors into the cubing operation. In this paper, an overview of the use of cubic-term generators in receivers relative to other applications is presented. An interstage frequency response plan is presented for a receiver cubic-term generator and is shown to function for arbitrary three-signal third-order intermodulation generation. The noise of such circuits is also considered and is shown to depend on the total incoming signal power across a particular frequency band. Finally, the effects of the interstage group delay are quantified in the context of a relevant communication standard requirement.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Internally Bandlimited Multistage Cubic-Term Generators for RF Receivers

Keehr

Hajimiri

2009

IEEE Trans. Circuits Syst. I

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“…The IM3 products are then digitized and used as inputs to an equalizer that cancels the baseband IM3 products in the MP. This idea has recently been posited in a system-level study [1]; however, the challenges of implementing this system with an integrated RF front-end have not yet been addressed. This solution has the advantages of being both power-efficient and robust.…”

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confidence: 99%

Equalization of IM3 Products in Wideband Direct-Conversion Receivers

Keehr

Hajimiri

2008

2008 IEEE International Solid-State Circuits Conference - Digest of Technical Papers

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As scaling reduces the breakdown voltage of CMOS devices and as system integration trends demand the further elimination of offchip components, there arises a great need to improve the linearity of RF receivers. Of particular interest is the direct-conversion architecture, which is currently the workhorse of the mobile telecommunications industry. Although much work has been recently reported in improving the IIP2 of these receivers, the IIP3 requirements still necessitate the use of an inter-stage SAW filter in many applications.In order to remove the SAW filter and to reduce the linearity requirements of the receiver circuitry, in this paper, an alternate path (AP) in parallel with the main path (MP) is introduced (Fig. 10.3.1). The AP generates IM3 products in the analog domain and downconverts them to baseband (BB) using the same LO signal as the MP. The IM3 products are then digitized and used as inputs to an equalizer that cancels the baseband IM3 products in the MP. This idea has recently been posited in a system-level study [1]; however, the challenges of implementing this system with an integrated RF front-end have not yet been addressed. This solution has the advantages of being both power-efficient and robust. Since the AP must only pass IM3 products, the dynamic ranges of its constituent blocks can be over 10dB less than those of the MP, allowing for significant power savings in its overall design. As problematic blocker conditions occur less than 10% of the time, the time-averaged power dissipation of the AP is further reduced from its nominal value by powering it on only when needed. The adaptive nature of the equalization guarantees robustness in the presence of changes in temperature, LO frequency, and blocker characteristics.The receiver architecture proposed in this paper is shown in Fig. 10.3.2. In order to provide a quantitative design objective, the UMTS standard is targeted. The single-ended-to-differential conversion previously handled by an inter-stage SAW filter is now performed by a balun. The balun is followed by high-IIP2 MP mixers [2] driven by Cherry-Hooper LO buffers. The MP BB filter is an active-RC 3 rd -order Chebyshev architecture that drives an 8b pipelined ADC with f s =50MHz. The AP is a scaled-down version of the MP, with the primary difference being the inclusion of an IM3 generator. For area efficiency, the AP mixer dispenses with the IM2 tuning inductor used in the MP while resistively loaded differential pairs serve as LO buffers. The AP 1 st -order BB filter drives an 8b pipelined ADC with f s =16.66MHz.In a proper design, the IM3 generator requires a dynamic range of 10dB above the desired IM3 cancellation ratio. Unlike other approaches [3] that use the 3 rd -order Taylor series term of the MOSFET, this design, shown in Fig. 10.3.3, exploits the stronger 2 nd -order term by using a conventional squaring circuit and by finishing the cubing with a Gilbert multiplier. Two Gilbert multipliers in series also accomplish a cubing, but generate a higher IM5 product since th...

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“…O ther t ypes o f r eceiver architectures require an image filter that can be designed in surface acoustic wave or bulk acoustic wave technology for which the level of the integration is very low [2]. However, the b aseband signals I (t) a nd Q (t) a t th e o utput o f this receiver can b e co rrupted b y d irect cu rrent ( dc) o ffset, inphase and quadrature (I/Q) mismatch, local oscillator (LO) leakage, and even order distortion [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Baseband I/Q regeneration Method for Direct Conversion Receiver to nullify effect of I/Q mismatch

Shah

Gupta

2016

AEM

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Direct C onversion Receiver is t he c hoice o f t he t oday's designer for low p ower co mpact wireless r eceiver. DCR is attractive d ue to lo w p ower, s mall s ize a nd h ighly monolithic i ntegratable s tructure, b ut d istortions a ffect its performance. I /Q mismatch i s the o ne o f t he major distortion which is responsible for performance degradation. In t his pa per, a novel method f or D irect Conversion Receiver is suggested, which makes it insensitive to the I/Q mismatch. H ere t he cl assical h omodyne ar chitecture is modified t o nu llify e ffect of I/Q mismatch. T he pr oposed method can b e i mplemented i n t he D igital Signal Processing (DSP) b ack-end section also. This feature makes i t accep table i n t he already d esigned/functioning classical homodyne architecture based receiver.

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Advanced digital signal processing techniques for compensation of nonlinear distortion in wideband multicarrier radio receivers

Cited by 96 publications

References 13 publications

Analysis of Internally Bandlimited Multistage Cubic-Term Generators for RF Receivers

Analysis of Internally Bandlimited Multistage Cubic-Term Generators for RF Receivers

Equalization of IM3 Products in Wideband Direct-Conversion Receivers

Baseband I/Q regeneration Method for Direct Conversion Receiver to nullify effect of I/Q mismatch

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