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In this paper, a novel in-band digital predistortion (I-DPD) technique with a reconfigurable coefficient pyramid is proposed to linearize a mmWave power amplifier excited by a modulated signal with very large bandwidth, such as 640 MHz. This method can overcome the multiple bandwidth regrowth issue in conventional DPD operation that normally places a burden on the 5G applications. By employing a coefficient...
In this paper, a novel in-band digital predistortion (I-DPD) technique with a reconfigurable coefficient pyramid is proposed to linearize a mmWave power amplifier excited by a modulated signal with very large bandwidth, such as 640 MHz. This method can overcome the multiple bandwidth regrowth issue in conventional DPD operation that normally places a burden on the 5G applications. By employing a coefficient...
This paper presents a broadband Doherty power amplifier (DPA) design with two continuous Class-F-1 matching circuit eliminating offset line in carrier way to increase the bandwidth and efficiency. By employing this compact and highly efficient design method, a DPA working at 2.0 GHz∼2.6 GHz is designed and implemented for verification. With continuous wave (CW) measurements, the experimental results...
This paper presented a frequency doubling two-path phased-array FMCW radar transceiver in 65nm CMOS process. The FMCW signal is generated by a fractional-N PLL. The frequency doubling scheme can lower down the frequency of the PLL, reduce the required phase shifting range of phase shifter and the design complexity of the LO distributed network. The FMCW chirp bandwidth is 1.93 GHz from 76.92 to 78...
A novel dual-polarized dielectric resonator antenna (DRA) for 3.5 GHz LTE base station is presented in this paper. In the design, a hybrid feeding technique is used to obtain high-isolation and low cross-polarization. The bandwidths of both ports are increased by digging a symmetric hole in the dielectric resonator (DR). In addition, the symmetric radiation patterns could be obtained because of the...
This paper proposes a design of a PLL frequency synthesizer for LTE wireless channel simulator. A triple-VCO is used in the single-loop PLL to design the broadband and miniature frequency synthesizer. The bandwidth is from 2.8GHz to 6GHz. Test results show that, in the offset frequency of 10kHz from the carriers, phase noises are −108.95dBc/Hz@3GHz, −103.94dBc/Hz@4GHz, −99.17dBc/Hz@5GHz and −94.32dBc/Hz@6GHz.
Topology-aware process mapping plays a pivotal role in improving the performance of parallel programs on modern large-scale cluster computing systems featuring multicore architecture and hierarchical network. This paper firstly introduces a method to obtain application communication topology and hardware topology. Then a topology-aware process mapping algorithm named Isomorphic Tree Mapping is proposed...
This paper presents a novel dual-mode tunable bandpass filter to significantly reduce the complexity for multiband communication. A mixed coupling scheme is utilized to analysis and design the dual mode tunable filter with source - load coupling. A simple approach is proposed to extract the parameters of varactor diode. For demonstration, a tunable filter is implemented with 73 MHz 3-dB bandwidth...
In this paper, a digital pre-distortion platform is designed for linearization of wideband power amplifier with nonlinearity and memory effect. The proposed platform consists of digital signal processing (DSP), field-programmable gate array (FPGA), analog to digital converter (ADC) and digital to analog converter (DAC) which are all operating under a high speed of 400MHz. The platform covers a frequency...
in P2P video-on-demand (VoD) streaming system, aggregate download bandwidth of users fluctuates significantly because of peer departure, bandwidth heterogeneity and network delay. The playback rate of videos also fluctuates in order to attain constant image quality. These two kinds of dynamics cause playback interruptions. Prefetching some video content before playback is an effective method to offset...
To alleviate the server bandwidth cost of online video sharing services, p2p delivering has been suggested as an effective tool with success already seen in accelerating individual sites. The numerous video sharing sites existed however call for a universal solution that provides transparent p2p acceleration beyond ad hoc solutions. More importantly, only a universal platform can fully explore the...
In peer-to-peer video-on-demand (VoD) streaming systems, each peer contributes a fixed amount of hard disk storage (usually 2GB) to store viewed videos and then uploads them to requesting peers. However, the daily hits (namely popularity) of different segments of the same video is highly diverse, which means that taking the whole video as the basic storage unit may lead to redundancy of unpopular...
Recent years have witnessed an explosion of online video sharing as a new killer Internet application. Yet, given limited network and server resources, user experience with existing video sharing sites are far from being satisfactory. To alleviate the bottleneck, peer-to-peer delivering has been suggested as an effective tool with success already seen in accelerating individual sites. The numerous...
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