efficiency and amplifier
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Design and Analysis Methodology for a Bluetooth Sub-Micron CMOS PA
White Paper This paper presents the methodology to design a Power Amplifier in sub-micron CMOS technology, taking into account all the parasitic effects. It delivers 8dBm output power with more than 25% of efficiency at 2.45GHz. [09 Aug 2008]
Classification of Two-Link Failures for All-Optical Networks
White Paper Links fail in many ways, ranging from amplifier failure to power outages to wayward backhoes. Algorithms addressing link failures must provide high-speed recovery through distributed operations on flexible topologies, and must simultaneously... [18 Jul 2008]
Advanced Design Methods of Doherty Amplifier for Wide Bandwidth, High Efficiency Base Station Power Amplifiers
White Paper This paper has proposed advanced design methods of Doherty amplifier for high efficiency base station power amplifiers with wide bandwidth. First, the paper develops Doherty amplifier with uneven power drive which is provided more input power to... [11 Jul 2008]
On the Peak-to-Average Ratio (PAR) of an IS-856 (cdma2000 1xEV) Forward Link
White Paper Peak-to-average ratio (PAR) of a signal determines the required backoff from the Power Amplifier (PA) compression point to keep clipping and hence spectral regrowth to within acceptable limits such that the maximum required power can be... [03 Jul 2008]
Benefits of Superconducting Technology to Wireless CDMA Networks
White Paper Combined with a cryocooled, low-noise amplifier, they significantly reduce the effective noise factor of a cellular base-station receiver. Potential benefits of superconducting technology include increased capacity utilization, coverage efficiency... [03 Jul 2008]
Highly Efficient Power Amplifier for IMT-2000 BTS Equipment
White Paper The power efficiency of new PA is double that of conventional PAs. Fujitsu have developed a new adaptive digital predistorter (DPD) and a multicarrier signal processing technique for reducing PA nonlinear distortion and have used it to build a new... [03 Jul 2008]
A Low Complexity Tree Algorithm for PTS-Based PAPR Reduction in Wireless OFDM
White Paper However, its high Peak-to-Average-Power Ratio (PAPR) causes nonlinear distortion thus limiting the efficiency of the transmitter's High Power Amplifier. This paper presents a new low-complexity tree algorithm to implement the PTS approach, which... [31 Aug 2007]
A Low Complexity Tree Algorithm for PTS-Based PAPR Reduction in Wireless OFDM
White Paper However, its high Peak-to-Average-Power Ratio (PAPR) causes nonlinear distortion thus limiting the efficiency of the transmitter's High Power Amplifier. This paper presents a new low-complexity tree algorithm to implement the PTS approach, which... [10 Aug 2007]
A Novel Receive Algorithm for Clipped OFDM Signals
White Paper The transmit Power Amplifier (PA) and other elements in the signal path have to be operated at high Input Power BackOff (IBO), which decreases the efficiency of the PA and leads to higher costs. The estimator is based on the distribution of the... [18 Apr 2007]
Superimposed Training for OFDM: A Peak-to-Average Power Ratio Analysis
White Paper High PARs require large backoff of the average operating power of a Radio-Frequency (RF) Power Amplifier (PA) in order to linearly amplify the signal, thus reducing the dc to RF power conversion efficiency. [13 Apr 2007]
An Analysis of OFDM Peak Power Reduction Techniques for WiMAX Systems
White Paper The main drawback of Orthogonal Frequency Division Multiplexing (OFDM) systems is the high Peak-to-Average Power Ratio (PAPR), which significantly reduces the efficiency of the transmit High Power Amplifier (HPA). [11 Apr 2007]
The Performance of OFDM-SDMA Systems With Power Amplifier Non-Linearities
White Paper Amplifier nonlinearities affect drastically the performance of Orthogonal Frequency Domain Multiplexing OFDM systems. In this paper, the effects of amplifier nonlinearities is evaluated in OFDM with Space-Division-Multiple-Access (SDMA).This paper... [11 Apr 2007]
A High Linearity, High Efficiency WiMAX Power Amplifier Using SiC MESFETs
White Paper Using SiC MESFETs, a single-stage power amplifier has been designed that provides a significant increase in performance, providing 17% drain efficiency, 1.5% EVM, and 3dB margin to spectral mask at 1.5W average output power under a WiMAX compliant... [10 May 2006]
WHT/OFDM - An Improved OFDM Transmission Method for Selective Fading Channels
White Paper However, the OFDM modulation also exhibits drawbacks such as: low immunity against frequency selective fading and a high peak-to average power ratio (PAPR), which necessitates the usage of a highly linear amplifier. [21 Oct 2004]
System Implications of Heat in Wireless High-Speed Data Networks
White Paper This is primarily due to the combination of two network components: first, the system decision to adopt signal types with both high bandwidth efficiency (HBE) and high envelope peak-to-average ratios; and second, the hardware consequence of large... [25 Feb 2004]
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