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.

System and method for supporting antenna beamforming in a cellular network

Abstract: The present invention is a method and system for supporting a beamfonming antenna system in a mobile broadband communication network with an improved beam pattern, beam sweep pattern, pilot channel design with feedback and reporting rules, and control signaling design. Specifically, the improved beam pattern includes a method of supporting wireless communications in a wireless network forming at least two spatial beams within a cell segment where the at least two spatial beams are associated with different power levels, and separately, where at least two spatial beams can be moved across the cell segment according to a unique sweep pattern. The pilot channel design improves network bandwidth performance and improve user mobility tracking. Feedback and reporting rules can be established using a particular field designator, CQI, in the preferred embodiment.

Analysis and Design of Maximum Power Point Tracking Scheme for Thermoelectric Battery Energy Storage System

Abstract: The analysis and design of an adaptive maximum power point tracking (MPPT) scheme using incremental impedance are presented. A small-signal model is mathematically derived, and the impact of two major design parameters, which are scaling factor and sampling interval, is analyzed in the frequency domain. Four factors which specifically affect the MPPT response are also clearly addressed. Based on this analysis, a design methodology to achieve a desirable transient response, while retaining system stability, is developed. The design methodology is implemented and verified with hardware experiments on a thermoelectric generator battery energy storage system, which indicate agreement between dynamic response and target bandwidth.

Capacitor-Voltage Feedforward With Full Delay Compensation to Improve Weak Grids Adaptability of LCL-Filtered Grid-Connected Converters for Distributed Generation Systems

Abstract: LCL -filtered grid-connected converters are widely used for distributed generation systems. However, the current regulation of such converters is susceptible to weak grid conditions, e.g., grid impedance variation and background harmonics. Paralleling multiple harmonic compensators (HCs) is a commonly used method to suppress the current distortion caused by grid background harmonics, but the control bandwidth should be wide enough to ensure system stability. In order to enhance the adaptability of LCL -filtered grid-connected converters under weak grid operation, this paper proposes an improved capacitor-voltage-feedforward control with full delay compensation. When used with converter-side current feedback, the proposed control can keep system low-frequency characteristic independent of grid impedance and provide a high-harmonic rejection capability without using additional HCs. Moreover, it completely avoids the design constraints of an LCL filter, i.e., $\omega _{r} is required for single-loop converter-side current control. Therefore, a higher resonant frequency can be designed to achieve a wider control bandwidth and to lower the current distortion caused by the paralleled filter capacitor branch. Experimental results are finally presented to verify the proposed control, which are also in good agreement with theoretical analysis.

Inserting local signals during MPEG channel changes

Abstract: An apparatus and a method for inserting and displaying one or more signals during processing and display delays encountered in digital STB-receivers, including those delays encountered during channel changes. Moreover, a means for increasing the channel change delay period, while maintaining subscriber satisfaction, and thereby freeing up bandwidth for other services, is provided. These signals can be advertisements, entertainment, or other messages. When a channel change request occurs on a digital set-top receiver, a local watchdog module detects the channel change event and causes to be generated a signal that is immediately displayed on the TV, while the MPEG-2 subsystem of the receiver acquires, stores, decodes and presents the new program to the television. Providing advertisements or entertainment during the delay period allows for increase in the delay period thus allowing for higher compression and increased availability of bandwidth.

A 240 GHz Fully Integrated Wideband QPSK Receiver in 65 nm CMOS

Abstract: Operation at millimeter-wave/sub-terahertz frequencies allows one to realize very high data-rate transceivers for wireless chip-to-chip communication In this paper, a 240 GHz 16 Gbps QPSK receiver is demonstrated in 65 nm CMOS technology The receiver employs a direct-conversion mixer-first architecture with an integrated slotted loop antenna A 240 GHz LO chain drives the passive mixers to down-convert the modulated data to baseband The baseband signal is then amplified using high gain, wide bandwidth amplifiers The receiver has a noise figure of 15 dB with a conversion gain of 25 dB calculated from measurement data The receiver achieves a data rate of 10 Gbps (with ${\rm BER} ) and a maximum data rate of 16 Gbps (with BER of $10^{-4}$ ) with a receiver efficiency of 16 pJ/bit