Broadband linear amplifier design for a PCN base-station

Kenington, P.B.; Wilkinson, R.J.; Marvill, J.D.

doi:10.1109/vetec.1991.140466

Cited by 14 publications

(6 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent years, QAM research for hostile fading mobile channels has been motivated by the ever increasing bandwidth-efficiency demand for mobile telephony [236]- [247], although it requires power-inefficient class A or AB linear amplification [248]- [251]. However, the power consumption of the lowefficiency class-A amplifier [250], [251] is less critical than that of the digital speech, image, and channel codecs. Outof-band emissions due to class AB amplifier nonlinearities' generating adjacent channel interferences can be reduced by some 15-20 dB using the adaptive predistorter proposed by Stapleton et al [252]- [254].…”

Section: A Choice Of Modulationmentioning

confidence: 99%

Bandwidth-efficient wireless multimedia communications

Hanzo

1998

Proc. IEEE

View full text Add to dashboard Cite

Section: A Choice Of Modulationmentioning

confidence: 99%

Bandwidth-efficient wireless multimedia communications

Hanzo

1998

Proc. IEEE

View full text Add to dashboard Cite

“…With the introduction of linearised high-power broadband amplifiers however, such linearity constraints are easily met. Amplifiers offering third-order intermodulation products suppressed by 7 W c , with output powers of several watts have been demonstrated [2] and should soon be widely available.…”

Section: Linearitymentioning

confidence: 99%

A high-gain cell enhancer

Slingsby

McGeehan

[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology

View full text Add to dashboard Cite

Cell enhancers, or broadband on-frequency repeaters (OFRs), offer radio network operators a cost-effective means of improving service quality in areas of low signal strength, or even extending coverage into new areas. Their ability to simultaneously receive and transmit in the same frequency band provides maximum spectral efficiency and renders them transparent to the rest of the network. For stable operation however, the repeater's receiver and transmitter must be isolated by a factor greater than its active gain. The maximum gain of current all enhancers is limited by relatively low transmitter/receiver isolation, while output powers are limited by the poor linearity of the multichannel amplifier. In situations where high gain and/ or high output powers are required, novel solutions must be sought. An enhanca offering these features is under development at the Univenrity of Bristol.

show abstract

“…1. The equations derived (1)(2) can be used to analyze the effects of feedback on the nonlinear distortion of amplifiers up to cubic nonlinearity. The analysis considers three input tones (f 1 , f 2 , f 3 ), but it can be related to two-tone test as well, if: (…”

Section: Theorymentioning

confidence: 99%

“…These factors make them difficult to be applied to small amplifiers for mobile equipment. The Feedforward technique [1][2] requires another amplifier, which reduces the overall efficiency of the amplifier circuit. Also it is very sensitive to the matching of the two loops required in the system.…”

Section: Introductionmentioning

confidence: 99%

A novel wideband active feedback amplifier linearization scheme suitable for handsets

Nesimoğlu

Canagarajah

McGeehan

et al.

VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)

Self Cite

View full text Add to dashboard Cite

-A new active feedback network is proposed for reducing intermodulation distortion (IMD). It is based on using the existing second harmonic zone (SHZ) distortion energy generated by the amplifier to predistort the input signals optimally to obtain a linear output. The technique is analyzed theoretically and practical results demonstrate the linearization performance. The measured two-tone test showed 23-dB reduction in the third-order intermodulation products (IMP 3 ), where π/4 DQPSK and W-CDMA gave up to 15-dB and 13-dB adjacent channel interference (ACI) suppression respectively. This technique differs from available active feedback techniques by performing both with narrow and wideband modulated signals. The linearization circuitry is simple and small in size.

show abstract

Broadband linear amplifier design for a PCN base-station

Cited by 14 publications

References 4 publications

Bandwidth-efficient wireless multimedia communications

Bandwidth-efficient wireless multimedia communications

A high-gain cell enhancer

A novel wideband active feedback amplifier linearization scheme suitable for handsets

Contact Info

Product

Resources

About