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Objective: The stepped-frequency chirp signal is a wide band radar signal which can obtain high resolution range profiles. But when it come across phase discordance, the energy of target cannot be accumulated and the corresponding radar system cannot detect any targets. In order to resolve the effect of phase uncertainties, an novel phase error compensation method is proposed in this paper. Method:...
This paper provides a comprehensive treatment of the design techniques of all-digital time integrators for time-mode signal processing (TMSP). A detailed examination of the principle, circuit implementation, operation, constraints, and limitations of time adders constructed from switched delay units (SDUs), dual discharge paths (DDP), and unidirectional gated delay lines (UDGDLs) is provided. It is...
In this paper studies an X-band ultra-wideband micro-balun based on LTCC, the working frequency of 7–13GHz, belonging to the X-band, the relative bandwidth is 60%. In this paper, from the design and manufacture of the product, combined with the theoretical basis, through the HFSS simulation software to complete the design, finally, it decided to use three coupling lines to improved Marchand Balun...
MIMO-OFDM technology is the key technology for the IEEE802.11ac broadband wireless LAN standards. The physical layer implementation schemes of the IEEE802.11ac uplink multi-user systems was investigated. The simulation results of the performance for uplink multi-user MIMO-OFDM systems are given.
The carrier frequency offset(CFO) in OFDM system is one of the key factors that affect the performance of wireless communication. Based on the analysis of the CFO estimation algorithm, this paper presents FPGA implementation scheme in the problem of OFDM fractional CFO estimation using pilot-based algorithm, including CFO estimation and CFO compensation. The circuit modules in the program were written...
Antenna is one of the key front-end components of wireless communication system and the radar system. A K-band slotted ridge waveguide antenna arrays based on radar-communication integration, consist of a transmitting antenna and a receiving antenna, is designed and measured. The relationship between the slot admittance, offset distance and resonant length of slot is analyzed. Combined with the slot...
An active quasi-circulator (AQC) operating at a frequency band ranging from 1.2–3.8 GHz is designed in a 0.18-μm CMOS process. To improve the isolation between AQC's ports common-gate (CG), common-source (CS) and common-drain (CD) configurations have been employed. To particularly improve the transmitter-to-receiver port isolation, out-of-phase cancellation is employed by making the transmit signal...
More than eighty different test environments need to be created and maintained for debugging the Marvell Ethernet PHY chip if the traditional industrial verification methodology is being used. This can easily incite very complicated debugging procedures and cause the problems and concerns of a multitude of engineering resources. The latest Marvell Ethernet PHY IC UVM verification platform integrating...
Present research work propose the design of a low energy and high throughput, hierarchical clustering based routing protocol for smart home sensor network application. Proposed protocol perform dynamic cluster head selection based on multiple node characteristics like node residual energy, node distance from sink and node average distance from neighbour nodes. Cluster head distribution is even and...
The Virtual MIMO scheme is a proven technique to reduce energy consumption in WSN but it cannot resolve the energy efficiency problem in WSN. In high node density WSN, sensor nodes transmitted correlated information to sink node that will decreases the energy efficiency of WSN. For enhancing the energy efficiency of WSN, we propose distributed source coding based on virtual MIMO. In DSC-MIMO, DSC...
This paper presents the design, trade-off of a very high bandwidth variable gain stage, and the practical limits during its implementation as a tunable gain cell in the high speed equalizer for next generation serial electrical / optical communication links. The variable gain stage presented in this work, achieves a bandwidth of above 50 GHz and a tunable gain range of 40 dB. With a very high input...
In this paper, an ultra-wideband stripline 3dB orthogonal directional coupler based on LTCC is studied. The operating frequency is 0.5–3.5GHz and the relative bandwidth is 150%. The difficulty lies in the requirements of ultra-wideband, high performance and miniaturization. In this paper, we started from the design and manufacture of the product, combined with the theoretical basis, through the HFSS...
Through silicon vias (TSVs) are arranged to form a rectangular resonant cavity to improve performance of silicon based antenna in this paper. On the basis of fundamental theory of rectangular resonant cavity, the model of cavity made of through silicon vias is analyzed. Considering the size of millimeter-wave antenna, the three dimensions of cavity for mode TE101 is calculated. Applying the resonant...
This paper presents a dual-channel GNSS receiver covering GPS and Beidou on a single chip in 0.13μm CMOS process. The receiver incorporates one reconfigurable RF front-end and two separate IF signal channels with one single fractional-N frequency synthesizer by using a ring voltage-controlled oscillator. This architecture supports an external active or passive antenna and provides the benefits of...
The iterative property of inverse butterfly permutation network makes it possible to implement shift operation with simple routing algorithm, which has high application value in cryptography, digital image processing and other fields. Based on the inverse butterfly network, this paper proposes a subword shift unit, which integrates the operations of subword rotation shift, subword logical shift and...
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