Distortion Analysis of Ultra-Wideband OFDM Receiver Front-Ends

Ranjan, M.; Larson, L.E.

doi:10.1109/tmtt.2006.882870

Cited by 9 publications

(11 citation statements)

References 6 publications

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“…Potential in-band interferers include WiMAX and WiFi devices, as well as airport and marine radars [8]. For the receiver to maintain adequate link margin and sensitivity, careful consideration needs to be given to cross-modulation distortion [3], [9].…”

Section: Receiver Specificationsmentioning

confidence: 99%

“…At 0.1 m, this power would drop to roughly 34.5 dBm for a Mode 1 system. The cross-modulation product of a narrowband jammer with an MB-OFDM transmitter is given by [3] ( 1) where is the frequency of the narrowband jammer and is the center frequency of the second unwanted MB-OFDM transmitter.…”

Section: Receiver Specificationsmentioning

confidence: 99%

“…With a narrowband jammer of 40 dBm at 3 GHz and a wideband jammer of 34.5 dBm at 4.4 GHz [3], integrating (1) from 3150 to 3500 MHz, corresponds to a total cross-modulation power at the mixer output of 66.6 dBm. This cross-modulation effectively increases the noise figure of the receiver by 2.6 dB.…”

Section: Receiver Specificationsmentioning

confidence: 99%

“…To calculate the intermodulation output at baseband, we can use [3] (5) where and are the peak amplitudes per carrier of the two undesired MB-OFDM signals and can be related to the corresponding RF input power using (2), and are the angular frequencies. Equation (5) can be integrated over the bandwidth of one MB-OFDM channel to obtain the total output noise power due to intermodulation.…”

Section: ) If Downconverter Intermodulation Distortionmentioning

confidence: 99%

“…2. Although OFDM systems are less susceptible to relatively narrowband jammers, nonlinearities in the receiver can result in jammer cross-modulation with wideband input signals, resulting in reduced signal-to-noise ratio (SNR) and a degradation in system performance [3]. In addition, received wideband signals (from other UWB transmitters) can intermodulate and the resulting products can land in a desired channel.…”

Section: Introductionmentioning

confidence: 99%

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A Low-Cost and Low-Power CMOS Receiver Front-End for MB-OFDM Ultra-Wideband Systems

Ranjan

Larson

2007

IEEE J. Solid-State Circuits

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Abstract-This paper presents an RF receiver front-end for MB-OFDM-based ultra-wideband (UWB) systems. The receiver occupies only 0.35 mm 2 in a 0.18 m CMOS process and consists of a low-noise amplifier, downconverter and a bandpass filter. There are no on-chip inductors and the receiver requires no off-chip matching components. The measured receiver gain is 21 dB, noise figure is less than 6.6 dB, input IIP 3 is 5.6 dBm, and the receiver consumes 19.5 mA from a 2.3 V supply. The receiver covers all the MB-OFDM bands from 3.1 to 8 GHz.

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Section: Receiver Specificationsmentioning

confidence: 99%

Section: Receiver Specificationsmentioning

confidence: 99%

Section: Receiver Specificationsmentioning

confidence: 99%

Section: ) If Downconverter Intermodulation Distortionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Low-Cost and Low-Power CMOS Receiver Front-End for MB-OFDM Ultra-Wideband Systems

Ranjan

Larson

2007

IEEE J. Solid-State Circuits

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Reconfigurable Multi-Band OFDM UWB Receivers: Circuits and System Considerations

Baldini

Manstretta

Erseghe

et al. 2009

Series on Integrated Circuits and Systems

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ULTRA wideband (UWB) is intended to provide a standard for high-speed short range wireless communication [1,2]. The ECMA 368 Standard [2] specifies the physical and medium access control layers for UWB networks using Multi-band Orthogonal Frequency Division Modulation (MB-OFDM). The spectrum from 3.1 to 10.6 GHz is divided into 14 bands of 528 MHz. Supported data rates range from 53.3 to 480 Mbps with a data-rate adaptation mechanism allowing each receiver to opt for the transmitter's data rate for the maximum throughput. The receiver RF front-end and the frequency synthesizer pose the highest design challenges. We will concentrate only on the former due to space limitations. Covering a broad bandwidth is quite challenging, especially for a CMOS implementation, where tuning out capacitive parasitics is the key to achieve low-power operation. An important aspect in UWB communication is the interference between different UWB devices and from other systems. Nearby wireless devices can produce in-band interference due to intermodulation and harmonic generation in the receiver front-end. In this chapter, we will evaluate the effects of interferers on the desired UWB signal, resulting from cross-modulation, intermodulation and harmonic distortion. Some of the existing receiver solutions will be reviewed and a receiver architecture with enhanced linearity performances will be described.

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