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Band-limited Volterra series model is an effective way for power amplifier (PA) modeling and digital predistortion (DPD), in the presence of limited DAC/ADC sampling rate. However, it suffers from the issue of requiring very high order baseband band-limiting filter to guarantee the model accuracy, which increases computational complexity drastically. This paper proposes a more efficient band-limited...
Space-time radio interferometric positioning system (STRIPS) is a indoor localization system with low complexity that is robust to multipath effects. Its general idea follows a radio interferometric positioning system (RIPS), where two transmitters transmit sinusoidal signals at slightly different frequencies to create a slowly-varying envelope at a receiver. The receiver employs a cost-efficient...
A novel focusing lens conical horn antenna loaded with dielectric is designed in this paper. The design method of the dielectric surface equation is given. The comparison between the proposed antenna and traditional spot focusing lens antenna is well discussed. Simulations show that the proposed antenna has advantages of small reflection, low cross-polarization, symmetrical beam, and small focal spot...
Selective catalytic reduction (SCR) is a standard aftertreatment technique to meet current engine emission regulations. In SCR system, AdBlue is always used as the reductant to be injected into the exhaust stream to convert NOx into N2. In order to ensure engine emissions compliance, insufficient or improper reductant in tank needs to be detected. In this paper, a non-contact method is proposed to...
In this paper, a 77 GHz waveform generator with Multiple Frequency Shift Keying (MFSK) is presented. This modulation waveform can improve the detection ability of automotive radar systems. A MFSK Modulation Control Logic (MMCL) is proposed, incorporates a conventional Σ-Δ fractional-N Phase Locked Loop to generate the modulation waveform. The MMCL has capability to track the linear frequency sweep...
A study of a solidly mounted bulk acoustic wave resonator (SMR) filter is presented. An overall design and fabrication summary is described, with both materials and structures of the resonator devices considered. Aluminum Nitride (AlN) is utilized as the piezoelectric material to convert electromagnetic signals to acoustic waves. Molybdenum (Mo) is used as the electrode material. A distributed Bragg...
This paper presents a broad band distributed amplifier (DA). The amplifying cell utilizes the cascode structure with transistor dimension mismatch. With different sizes of the transistor used, the input and output capacitance will be more balanced and hence, better impedance matching is achieved for the designed DA. 70 nm InP HEMTs are used to fabricate the proposed design, the total chip area occupied...
In this paper, the design of an ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna based on metamaterial is proposed. The antenna is designed to achieve dual band-notched and high isolation using metamaterials. The traditional split ring resonators (SRRs) are used to achieve the band-notched effect and a new type of SRR is used to reduce the mutual coupling at both 3.1 GHz and 10 GHz...
A co-located tri-polarized dipole (TPD) antenna with low mutual coupling is proposed and fabricated in this paper. The TPD antenna has a measured isolation performance better than −25 dB over the working bandwidth of 2.35–2.53 GHz. Furthermore, the correlation coefficients of the TPD MIMO channel are measured in a lossy and non-lossy reverberation chamber, individually. In both the transmitting (Tx)...
Terrestrial applications of microwave power transmission (MPT) such as RFID is highly challenging. As the distance between energy transmitter and receiving circuit increases, the available received power ramps down, thus causing an abrupt drop in RF/DC conversion circuit. Numerous works have been reported recently, but resulting in very incremental improvements over the state of the art.
This paper presents a complete model of an on-chip wireless power transmission (WPT) system, which is essential to design a WPT link that can operate at maximum power efficiency within the design constraint of a particular application. In the process of WPT modeling, a unified model of planar inductor was proposed, which captured both PCB and on-chip inductor characteristics. Also, the mutual inductance...
This paper presents a wide band LNA for the IEEE 802.11 WLAN. The LNA uses two feedback paths to enhance linearity and in-band gain ripple. The −3 dB bandwidth is 4 GHz with center frequency of 4.7 GHz. The current reuse technique is utilized to reduce the power consumption and the noise figure (NF). Post-Layout simulation results demonstrate that the achievable input third-order intercept point (IIP3)...
This paper presents a compact 4∶1 ratio transformer-based balun design in 65-nm CMOS process. The insertion loss is lower than 1.5 dB from 56 GHz to 64 GHz. The balun also serves as a matching network between the output of mixer and chip output terminal. By choosing appropriate inductance ratio and mutual coupling coefficient, the impedance transforms from (52.9+j85.8) Ω to (29.1+j4.7) Ω. Cascade...
Two wideband bandpass filter (BPF) are proposed and designed using the U-slotted substrate integrated waveguide (SIW) cavities. The U-shape slots, etched on the SIW cavity, are used to form up a new multiple-mode resonator (MMR) in order to achieve a wide passband of operation while keeping the overall size of the filter circuit to be much compact. In order to prove the validity, two wideband SIW...
This paper presents a dual-port planar multiple-input-multiple-output (MIMO) antenna with wide bandwidth. The proposed MIMO antenna element consists of a monopole and a step impedance resonator (SIR) stub which extends from the ground and is coupling fed by the monopole. A slot is etched on the ground and a neutralization line is connected with the two antenna elements for decoupling. The simulated...
In this paper, the steady-state throughput of random-access packet broadcasting in optical CDMA network is analyzed, where the packet size is assumed to be fixed. Since the MAI and beat noise pose a significant impact on system performance in T/W optical CDMA system, using error correction code is an effective way to alleviate such adverse impact. Accordingly, the bit error rate can be further decreased...
Performance of Crest Factor Reduction (CFR) technique based on peak windowing scheme along with Digital Predistortion (DPD) technique using Generalized Memory Polynomial (GMPDPD) is studied, and its effect on the performance of power amplifier (PA) is reported. Experimental results show that at system level the CFR techniques can reasonably reduce the peak to average power ratio (PAPR) of the input...
This paper introduces concept of an ultra-broad-band cellular phased array with multiple steerable spotlight beams. The proposed array produces multiple 65-degree coverage beams and multiple steerable “spotlight” beams (HPBW<14deg) for cellular MIMO coverage with hot-spots or small-cell enhancement. The spotlight beams can be steered electronically both in azimuth and elevation directions to provide...
Based on the measured interference power, the optimal location of the base station is obtained by minimizing the sum of the ratio of the interference power to the signal power for all interesting points in the downlink. Especially, a closed-form solution is derived when the path loss exponent is 2. The results show that the optimal base station location is closer to the major interference area.
Modern electrical devices prepare less space for antennas. Both the miniaturization of antenna elements and decoupling of antenna arrays have become significant problems to solve. This paper firstly discusses the usage of lossless passive network to decouple strongly coupled antennas, such as some previous works done by other authors. Then this paper mainly concentrates on the Eigen mode decoupling...
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