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A 4.6–5.6 GHz constant KVCO LC-VCO applied in PLL frequency synthesizer is presented in this paper. With constant KVCO LC-VCO and programmable charge pump, the frequency synthesizer is able to obtain constant bandwidth. Furthermore, the VCO has a low KVCO which will result low phase noise. An Optimized automatic frequency calibrator (AFC) is proposed, the AFC can select the sub-band which is nearest...
A 65-nm all-digital Class-S transmitter with an entire digital frontend (DFE) and a current-mode Class-D (CMCD) power amplifier (PA) is presented. To realize the high operation rate and performance of the DFE, which includes a 1-bit band-pass $\Sigma \Delta $ modulator, a mixer, and interpolation filters, approaches, such as time-interleaving algorithm and modified Manchester encoding, are adopted...
An all-digital quadrature RF transmitter implemented in TSMC 65-nm CMOS technology is presented. The transmitter incorporates an 8-bit low-pass ΣΔ modulator to reduce the digital baseband data width and the complexity of multi-bit power amplifier cells while not significantly deteriorate the in-band signal quality. For an 802.11g 20MHz OFDM signal, the transmitter achieves 13.93dBm average output...
With the maturity of Internet and rapid development of the Mobile Internet, the network protocols drafted by IETF, 3GPP, 3GPP2 and other standard organizations grow massively, and at the same time attacks against the network protocols are also increasing rapidly. The Robustness test for the network protocols is becoming increasingly important, since the protocols and applications will be absolutely...
Wireless sensor networks for existing energy consumption of each node in the uneven defect, combined with PEGASIS protocol, the first choice from the cluster, cluster formation, cluster routing and other aspects of LEACH protocol has been improved. Through theoretical analysis and simulation experiments to verify the performance of the protocol, and compared with the LEACH protocol. The results show...
Fouling in sewage heat exchanger mainly restrict large-scale application of sewage-source heat pump. This article introduces the influence of scaling on heat transfer and pressure drop. Based on the scale removal methods home and abroad, excogitates on-line cleaning method of biofouling in sewage-source heat pump, and briefly introduces the principle of on-line cleaning method.
In view to many problems on the traditional way of Just-In-Time (JIT) production not suitable for varieties of small batch production, this paper proposed a new strategy for solving these problems based on the improved kanban techniques, namely, visualization kanban techniques. By comparing with the traditional kanban, the visualization kanban performance has been proved to be efficient and more applicable...
Bivariate shrinkage was a denoising method based on the interscale dependency of wavelet coefficients which using bivariate model as the distribution of the wavelet coefficient and its parent. Although the joint coefficient-parent distributions are different for coefficients in different scales and sub bands, bivariate shrinkage uses the same model for all the coefficients. In order to improve the...
One of the key targets for LTE/SAE is 100 Mbps peak data rate in downlink. While compared to the lined data rate, the wireless data rate is still a bottleneck. This means if there is no flow control in aGW; packets will be buffered in eNB. While the buffer in eNB is limited, packets may be dropped. To reduce the harm to the performance of the TCP based application from packet loss, flow control is...
Based on the OFDM technique and the character of cognitive radio (CR), a multiuser WiMAX resource allocation algorithm is proposed. In the algorithm, cognitive users use the vacant spectrum resources under the condition of not interfering the primary users based on the spectrum information detections. Make use of water-filling algorithm to one or more users requesting the use of same subcarrier to...
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