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In this paper, a new modulation classification method based on joint moments and linear transform is proposed. In the method, the amplitude and phase of a received signal are linearly transformed, and then joint moments are used to classify modulations. The joint moments are derived in a form of the infinite series of elementary functions to analyze classification error probability. Numerical results...
This paper presents, for the first time, a MEMS-enabled dual-band receiver front-end in 0.13-mum CMOS, which covers both 1.8-GHz and 5-6-GHz bands. A packaged MEMS series switch is used to tune the LNA's input impedance for narrow-band matching in each of these bands. The mixer of the front-end is a double-balanced folded Gilbert cell, which is followed by a programmable current-output stage. The...
This paper presents the design and implementation of dual-band filters using lumped components that are completely embedded in a multi-layer organic process technology, which incorporates multiple liquid crystalline polymer (LCP) substrates. The paper presents the design methodology and measurement results of the small form factor fully-integrated filters that are directly applicable to WLAN systems...
Extensive efforts are currently underway to develop universal wireless receivers to address multi-band, multi-service, and multi-standard operation. There are four options for the design of the associated antennas. Reconfigurable antennas, however, would have potential in providing such great versatility, offering a compact size, low cost, and high performance. Nevertheless, they have certain limitations,...
Greedy interference avoidance provides distributed algorithms for CDMA codeword optimization. These algorithms are based on the implicit assumption that active users have access to the correlation matrix of the the received signal, which should be made available to users through a feedback channel. As a consequence the performance of greedy interference avoidance algorithms will be limited by the...
In this paper, we demonstrate that high-coupling and ultra-low-loss transformers for 60-100 GHz CMOS RFIC applications can be achieved by using single-turn two-layer interlaced stacked (STIS) structure implemented in a standard CMOS technology. State-of-the-art G Amax of 0.711, 0.922, and ~1 (i.e. NFmin of 1.48, 0.35, and ~0 dB) were achieved at 60, 80, and 100 GHz, respectively, for a STIS transformer...
0.4-5.2 GHz broad-band SiGe-MMIC direct conversion quadrature mixer (Q-MDC) has been developed for multi-band multi-mode cognitive radio receivers by using 0.35 mum SiGe BiCMOS process. To realize broad-band characteristic, a static frequency divider with two-stage emitter follower is used as 90 degree power divider for LO and broad-band doubly balanced mixers are used as I/Q unit mixers. The 90 degree...
To extend an available period of wireless sensor networks, transmission power control is regarded as one of the promising schemes. In most of the previous studies on the transmission power control, it is assumed that a transmitter has power consumption of O(dm), where d and n denote a maximum communication distance and a pass loss factor. This assumption would substantially hold under the condition...
A multistandard RF front-end using a tunable interstage matching network is designed in 0.25 mum CMOS technology. It consists of a wideband LNA, interstage matching network, and a Gilbert-cell mixer. Tunability of the interstage matching can be obtained by a MOS varactor. It can change tuning frequency by controlling capacitance of varactor. Gain can be flattened over whole target band by the proposed...
Ultra wideband (UWB) radio technology has many advantages: i.e., ultra wide 7.5 GHz spectrum bandwidth, extremely high throughput, very low power, etc. This paper presents a single-chip low-power 3.1-10.6 GHz low-noise amplifier (LNA) designed for pulse-based full-band UWB transceivers, which features an improved shunt-series feedback topology to achieve desirable ultra broadband gain and noise performance...
In this paper, we introduce the multicanonical (MUC) sampling technique to efficiently simulate the performance of communication systems. MUC can be considered as a unique importance sampling technique that employs an iterative procedure to converge to the optimal biasing of the distribution of the system random sources. As one example, multicanonical sampling is applied to the performance simulation...
Notice of Violation of IEEE Publication Principles"A 10GHz 0.11 μm CMOS Varactor-less LC-VCO for Multi-Standard 802.11a/b/g WLAN Using High Resolution Frequency Calibration"by Maxim, A.in the Proceedings of the 2007 IEEE Radio and Wireless Symposium,Jan. 2007 Page(s):189-192After careful and considered review, it has been determined that the above paper is in violation of IEEE's Publication...
The design of millimeter-wave CMOS voltage-controlled oscillators (VCOs) is reviewed. A low parasitic cross-coupled transistor layout is developed, and used to demonstrate a 140-GHz fundamental mode VCO in 90-nm CMOS and a 192-GHz push-push VCO in 130-nm CMOS. These are the circuits with the highest fundamental and harmonic operating frequencies achieved in silicon integrated circuits
This paper presents the implementation of a 4times4 multiple input multiple output (MIMO) test-bed that is employed for channel characterization using virtual MIMO indoor channel sounding technique. The 4times4 MIMO operates at ISM frequency of 2.45 GHz with 5 MHz of bandwidth using low cost commercially available off-the-shelf components (COTS). The system benefits from direct conversion transceiver...
Design, simulation, and optimization of a coplanar waveguide (CPW)-fed on-chip slot loop antenna on photonic crystal silicon substrate are presented. The antenna is designed for 24 GHz because of the existing unlicensed band in this frequency. Silicon is used as substrate to integrate the antenna with active devices toward realization of system on chip (SOC). Because of considerable losses of silicon...
A low-power switched gain low noise amplifier (LNA) is presented for ultrawideband (UWB) wireless applications. The proposed topology is co-designed with transmit/receive (T/R) switch for mode 1 OFDM applications and the integrated circuit is implemented in a 0.13 mum CMOS technology. The measurement results show a gain-switch of 10 dB where s21 in the frequency band of interest is 17.4-19.2 dB at...
This paper reports the development of an FMCW radar front-end system integrated on one single substrate based on substrate integrated circuits (SICs) technology. The application of SICs not only enables the complete integration of microwave circuits to attain system level, but also combine respective advantages of planar structures such as microstrip and non-planar structures such as waveguides as...
A bulk acoustic wave filter, which can be used in EDGE transmitter, is presented in this paper. It attenuates power amplifier harmonic frequencies and out-of-band noise generated by sigma-delta modulator needed in linear architecture. This filter achieves 2.4 dB insertion loss including matching network to 50 Omega and more than 15 dB of return loss. Power handling capability and linearity performance...
Recently, a new transmitted reference (TR) pulse cluster structure was proposed. This new structure contains uniformly and compactly spaced reference and data pulses, and thus enables a simple, robust and practical auto-correlation detector to be used in the receiver. Our previous research showed that inter-pulse interference (IPI) is present in the received TR pulse cluster signal due to the dense...
An investigation into the design of optimal low-profile, small antennas for unattended ground sensor (UGS) networks operating at VHF or higher frequencies is featured in this study. Because UGS transceivers are intended for operation near the ground, ground proximity effects become extremely important for considerations related to antenna efficiency, input matching, radiation pattern, and the overall...
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