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Bandwidth (signal processing)

About: Bandwidth (signal processing) is a research topic. Over the lifetime, 48550 publications have been published within this topic receiving 600741 citations. The topic is also known as: Bandwidth (signal processing) & bandwidth.


Papers
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Journal ArticleDOI
TL;DR: A small shift of the output-voltage sampling can significantly increase the UPS voltage-loop bandwidth while keeping the same stability margin, and less contribution comes from the delay minimization of the inductor-current sampling, so that current-ripple cancellation techniques are not needed.
Abstract: This paper investigates the effects of control-delay minimization in the dynamic performance of the output stage of uninterruptible power supplies (UPSs) by shifting the sampling time of inductor current and output voltage toward the duty-cycle update instant. This paper shows how a small shift of the output-voltage sampling can significantly increase the UPS voltage-loop bandwidth while keeping the same stability margin. Instead, less contribution comes from the delay minimization of the inductor-current sampling, so that current-ripple cancellation techniques are not needed. A detailed model based on the modified Z-transform, which accounts for different time delays in multiloop control, is proposed. The effectiveness of the proposed analysis is demonstrated by simulation and experimental results on a typical industrial three-phase/three-phase 8-kHz 30-kVA UPS prototype. By using two control designs based on the same phase margin, the output-voltage total harmonic distortion with the normalized distorting load is reduced from 6.8% to 5.7%, using a delay of the output voltage sampling equal to 25 mus.

101 citations

Patent
10 Mar 1988
TL;DR: In this paper, a method and apparatus for combining encoding and modulation creates signal sets from available amplitude and phase modulations by indexing ordered subspaces, which can be in either finite block or convolutional form, depending on the natural format of the desired transmission.
Abstract: A method and apparatus for combining encoding and modulation creates signal sets from available amplitude and phase modulations by indexing ordered subspaces. The subspaces need not be limited to the class of subspaces known as binary subspaces. The resultant signal sets, for a preselected power and bandwidth, are widely separated and unlikely to be confused by the effects of channel noise. Such signals can be in either finite block or convolutional form, depending on the natural format of the desired transmission. Further according to the invention are basic apparatus for encoding and modulating as well as demodulating and decoding a signal in accordance with the invention. Specifically, a method is provided for decoding the incorporates a specific type of decoding/demodulation techniques which develops accurate estimates of the information from the received signal in a computationally efficient manner and which permits high speed operation using softdecision decoders.

101 citations

Journal ArticleDOI
TL;DR: In this article, a modulation bandwidth of 25 GHz for InP-based lasers, using devices with p-doped, strained multiquantum-well active regions, was reported.
Abstract: A modulation bandwidth of 25 GHz for InP based lasers, using devices with p-doped, strained multiquantum-well active regions is reported. The doping reduces the bandwidth limitations caused by hole transport in standard quantum-well lasers, as well as increasing resonance frequencies to over 30 GHz. The present 25 GHz bandwidth is limited by device parasitics, with a predicted intrinsic device bandwidth of over 40 GHz.

101 citations

Journal ArticleDOI
TL;DR: A DSP-based single channel PAM4 at 56Gbaud that fits into QSFP that enables use of mature 25G optoelectronics for 2-10km datacenter intra-connections, and 8Tbit/sec over 80km interconnections between data centers.
Abstract: 112Gbit/sec DSP-based single channel transmission of PAM4 at 56Gbaud over 15GHz of effective analog bandwidth is experimentally demonstrated. The DSP enables use of mature 25G optoelectronics for 2-10km datacenter intra-connections, and 8Tbit/sec over 80km interconnections between data centers.

101 citations

Proceedings ArticleDOI
21 May 2002
TL;DR: Novel narrowband interference suppression algorithms for UWB radio systems are presented andoretical analysis of these algorithms reveal that they can eliminate the narrow band interference almost completely.
Abstract: Ultra-wideband (UWB) radio systems have drawn a lot of attention during the last few years. These systems use very low transmission power, spread over a bandwidth of several gigahertz. The very low transmission power and the large bandwidth used enable UWB radio systems to coexist with other narrowband systems over the same frequency band without interfering with the narrowband systems. Nevertheless, these narrowband systems may cause interference which jams the UWB receiver completely. Since standard narrowband interference suppression techniques are not applicable, techniques for interference suppression have to be developed. This paper presents novel narrowband interference suppression algorithms for UWB radio systems. Theoretical analysis of these algorithms reveal that they can eliminate the narrowband interference almost completely.

101 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202217
20211,517
20202,656
20193,121
20183,100
20172,744