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This paper presents a multi-band receiver front-end IC in 90nm CMOS technology. The receiver front-end IC is switchable between a 5GHz front-end and a 60GHz front-end. The architecture of the receiver front-end IC is a direct conversion in 5GHz band and a superheterodyne in 60GHz band. For the miniaturization, the 5GHz and 60GHz front-ends share a variable gain amplifier for adjustment of power level...
This paper presents an flip-chip assembled 60GHz CMOS receiver front-end. The receiver front-end consists of a cascode LNA, a balun, a harmonic mixer, and an IF amplifier fabricated by 90nm CMOS. The flip-chip assembled cascode LNA performs 31.1dB gain as well as on-wafer probing with NF of 5.8dB and output P1dB of −3.9dBm at 60GHz while consuming 26.9mW. The flip-chip assembled receiver front-end...
The explosive growth of usage with diversifying communication technologies and applications imposes the Internet to manage further scalability and diversity, which requires more adaptive and flexible sharing schemes of network resource. Especially when a number of distributed applications concurrently share the resource, efficacy on comprehensive usage of network, computation, and storage resources...
In this contribution, we will reveal some problems related to the transition of the maxmin fairness concept from the continuous to the discrete domain. By means of the wireless channel allocation problem, a heuristic approach to fairness allocation will be presented, based on searching for allocations with high similarity of the corresponding throughputs and high total throughput at the same time...
An integration of multiple-location, diverse-type, and long-term measurements has been considered a key means for continuous acquisition of the global status and for timely and cost-efficient identification of the causes of communication performance degradation. In addition, the measured data and analyzed results should be shared and reused for efficiency. Therefore, a global network measurement platform...
We introduce a transmission control protocol with a delay based congestion avoidance. The protocol design follows a control theoretical approach, uses session path estimators, and is adaptive and stable to a wide range of path characteristics and network conditions. We demonstrate the competitive performance of the protocol via open source based network experiments over a research network and the...
This paper presents a millimeter-wave dual-frequency voltage controlled oscillator (VCO), which enables to provide the fundamental and the second harmonic signals from its different ports without frequency multiplier and power divider. In order to provide the fundamental signals, a coupled line is applied instead of a transmission line between the transistor and the resonator in the conventional reflection-type...
A high loaded Q resonator and harmonic output topology are both potent technique to realize a low phase noise oscillator. This paper proposes a low phase noise Voltage Controlled Oscillator (VCO) with harmonic output, using a dual-tapped microstrip resonator of the high loaded Q factor. The paper also shows a load circuit configuration to suppress the output of the fundamental oscillation. The output...
A high loaded Q resonator and harmonic output topology are both potent technique to realize a low phase noise oscillator. This paper proposes a low phase noise Voltage Controlled Oscillator (VCO) with harmonic output, using a dual-tapped microstrip resonator of the high loaded Q factor. The paper also shows a load circuit configuration to suppress the output of the fundamental oscillation. The output...
In the Internet of the future, a flexible, dynamic combination of wireless and wired access networks is expected to be a key driver for enlarging the broadband communication service area. However, in general, the number of broadband wireless access points is limited due to their cost, and hence, they cannot cover the whole network. On the other hand, various message delivery schemes based on store-carry-forward...
The high-speed power line communications (PLC) technology has great potential to serve as an infrastructure for home networking because every home electric device must be connected to a power line network. However, various special environmental factors, such as power level attenuation, divergence between different voltage lines (100/200 V), and fluctuations of source impedance and noise by other equipment,...
The present paper is motivated by the question how we can quickly transfer large-sized file if multiple (heterogeneous) networks are available but each of which has quite insufficient performance for the requested task. We propose a research framework for large-sized data transfer by integrating multiple and heterogeneous challenged access networks, in which long delays, leaks (heavy packet losses),...
This paper proposes an evolutionary approach to the network traffic optimization under the constraint of congestion avoidance. The individuals of the evolving population directly represents a set of paths in a network, and corresponding crossover and mutation operators are provided. The optimization is a global one, i.e. it will not optimize the paths independently but also taking link sharing into...
The use of dynamic spectrum access techniques has a great potential in future inter-vehicle communications, while it must cope with (i) temporal and spatial spectrum utilization changes introduced by the primary and secondary users (environmental changes); and (ii) topology changes due to movement of vehicles (spatial movement). In the present paper, along this line, dynamic per-hop channel switching...
In this paper, we discuss the opportunities for global optimization of networks, which takes the user perspective into account. We state three fundamental problems in this approach, which are the variable (and usually also large) number of objectives, the arrow impossibility theorem, and the unavoidance of the fact that the feasible space may contain solutions, where some objectives are extreme. To...
In this document, we introduce Cap Start TCP, an adaptive Slow Start scheme that consistently achieves fast TCP file transfer times regardless of high speed network scenario. Once the TCP session is established, we estimate TCP session path capacity scenario, and tune the transport protocol to deliver fast transfer times. We demonstrate significant transaction performance improvements, of as much...
Introducing adaptive online data compression at network-internal nodes is considered to mitigate congestion on the network. In this paper, assuming that advanced relay nodes, which possess both a relay function (network resource) and a processing function (computational and storage resources), are placed inside the network, we propose an adaptive online lossless packet compression scheme performed...
Overlay routing can be used as a Traffic Engineering (TE) technique to realize efficient resource utilization and load balancing in the current wired Internet. Conventional overlay routing uses a detour path immediately upon quality degradation of the default path. However, with the widespread use of mobile and wireless communication technologies, conventional overlay routing faces several significant...
Aims/hypothesis The WFS1 gene encodes an endoplasmic reticulum (ER) membrane-embedded protein called Wolfram syndrome 1 protein, homozygous mutations of which cause selective beta cell loss in humans. The function(s) of this protein and the mechanism by which the mutations of this gene cause beta cell death are still not fully understood. We hypothesised that increased insulin demand as a result of...
We have already proposed a triple tuned voltage controlled oscillator (VCO) for achieving an ultra-wideband characteristic. The fabricated VCO in C-Ku band has achieved the oscillation bandwidth of 5.6 GHz-16.8 GHz. In this paper, for achieving the wide oscillation bandwidth in the higher frequency band, we proposes a VCO that consists of a MMIC working as an active circuit and external hyper-abrupt...
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