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检索条件"主题词=Modulation coding"

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A modulation Dependent Channel Coherence Metric for VANET Simulation Using IEEE 802.11p

A Modulation Dependent Channel Coherence Metric for VANET Si...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Jared Dulmage Michael P. Fitz Danijela Čabrić Department of Electrical Engineering University of California Los Angeles Los Angeles California

The most common physical layer models for network simulations are the bit error rate and the SNR threshold model. In time-varying channels such as those experienced in vehicular networks, these models are assumed valid as long as the packet duration is less than the coherence time of the channel. The coherence time is a statistical measure of the channel invariance. It is independent of the signal parameters or the receiver structure. While it is convenient to decouple the system performance from the channel, this paper shows that this simplification may lead to inaccurate performance assessments and erroneous conclusions. This paper suggests a new metric, the normalized empirical coherence time (NETC), based on results from an extensive simulation campaign of a typical IEEE 802.11p system. The NETC delineates the minimum time (as a percentage of signal duration) over which the system achieves some performance threshold. The metric is explicitly a function of modulation, packet duration, and the traditional coherence time. This new metric could be used in place of the traditional coherence time as a constraint on the packet duration necessary to assume channel variation has negligible impact on performance.

关键词： Error analysis Coherence Bit error rate Time-varying channels Degradation Physical layer Computational modeling System performance Narrowband modulation coding

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EVM based AMC for an OFDM system

EVM based AMC for an OFDM system

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Wireless Telecommunications Symposium, WTS

作者： Ramdane Chouitem US

A conventional OFDM system often poses a stringent linearity requirement to the transmitter, especially the radio-frequency power amplifier (RFPA), to maintain its bit error rate (BER). As a result, the output power from a RFPA is often limited, thus, the communication distance is compromised. With the deployment of WiMAX (IEEE 802.16), which is targeting at the mobile market, the communication distance is a concern. In this project, we propose to use Adaptive modulation and coding (AMC) to adaptively control the digital modulation and the output power of a RFPA. When the AMC selects the modulation order with the coding rate to achieve the targeted BER, the output power of a RFPA can be increased as long as its Error Vector Magnitude (EVM) is less than the required. Therefore, the communication distance of an OFDM system could be intelligently extended.

关键词： OFDM Bit error rate Power generation Power amplifiers Mobile communication Digital modulation modulation coding Linearity Radio transmitters Radio frequency

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A robust bias detection method in the frequency domain for code delay estimation applied to modern navigation modulations.

A robust bias detection method in the frequency domain for c...

引用

IEEE Symposium on Position Location and Navigation (PLANS)

作者： David Fernandez Prim Institute of Applied Systems Technology Joanneum Research Forschungsgesellschaft GmbH Graz Austria

ISBN: (纸本)9781424450367;9781424450374

The present paper develops an innovative method in the frequency domain for code delay false lock detection and resolution, applicable to GNSS receivers compatible with subcarrier navigation modulations. This novel technique is based on the cross-spectrum estimation between the cross-correlation of received and locally generated spreading codes, and its well-know theoretical non-shifted autocorrelation. The code delay bias is then obtained back in the time domain, and subtracted in closed loop from the output of the numerically controlled oscillator that generates the delayed code replicas in a classical early-prompt-late GNSS receiver architecture. Parametrical optimization pending, this novel technique already shows an entire reduction of systematic errors on the estimated code delay in AWGN channels for BOCcos(10, 5) on Galileo E6a and BOCcos(15, 2.5) on Galileo E1a, with virtually no additional performance degradation in terms of code delay jitter.

关键词： Robustness Frequency domain analysis Delay estimation modulation coding Satellite navigation systems Delay effects Tracking loops Pulse modulation Degradation Pulse shaping methods

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Adaptive Wavelet modulation for Cognitive Radio

Adaptive Wavelet Modulation for Cognitive Radio

引用

IEEE Conference on Wireless Communications and Networking

作者： Marco Lixia Maurizio Murroni Department of Electrical and Electronic Engineering University of Cagliari Cagliari Italy

Wavelet modulation (WM) has been investigated in the past as multi-rate transmission technique on channels unknown in time or bandwidth. Such a channel conditions are common in Dynamic Spectrum Access (DSA) networks where secondary users aim to opportunistically transmit alongside primaries. In this paper, WM is opportunely designed to exploit channel opportunities avoiding interferences with the primary users of the spectrum. Unequal power allocation is performed according to both channel availability and data sensitivity to channel errors: zero power (i.e., carrier suppression) is assigned to potentially harmful wavelets whereas the power budget is distributed on safe wavelets in order to optimize the minimum square error between transmitted and received data. As to optimization Genetic Algorithms (GA) are used due to their capacity to solve complex problems with reduced convergence time and predefined accuracy when tailored to specific cases.

关键词： Cognitive radio Bandwidth Channel coding Interference Availability Genetic algorithms Frequency Wireless communication Digital modulation modulation coding

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Half-symbol BPSK-modulated multicarrier system using parallel combinatory code

Half-symbol BPSK-modulated multicarrier system using paralle...

引用

International Conference on Wireless and Optical Communications ( WOCC)

作者： Yafei Hou Tomohiro Hase Research Center of Information and Communication Systems Ryukoku University Japan Faculty of Science and Technology Ryukoku University Japan

ISBN: (纸本)9781424475971

This paper introduces a novel multicarrier system called the BPSK modulated parallel combinatory / half-symbol multicarrier modulation (PC/HS-MCM) system by combining the BPSK modulated HS-MCM system and the parallel combinatory code. The proposed system can achieve twice bandwidth efficiency (BWE) than that of the BPSK modulated PC-OFDM system by sending a half time-domain BPSK-modulated PC-OFDM waveform. We propose two types of demodulation algorithm for this system, that is, orthogonality demodulation and M-algorithm demodulation. Orthogonality demodulation can recover the orthogonality between the subcarriers with 3 dB BER performance deterioration. The M-algorithm demodulation can realize a BER performance improvement with a moderate computational complexity.

关键词： Binary phase shift keying OFDM modulation modulation coding Demodulation Time domain analysis Bandwidth Bit error rate AWGN channels Transmitters Multicarrier code division multiple access

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On the Performance of Pilot Symbol Assisted modulation for Cooperative Systems with Imperfect Channel Estimation

On the Performance of Pilot Symbol Assisted Modulation for C...

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IEEE Conference on Wireless Communications and Networking

作者： M. Jafar Taghiyar Sami Muhaidat Jie Liang School of Engineering Science Simon Fraser University BC Canada

In this paper, we analyze the impact of imperfect channel estimation on the performance of pilot symbol assisted modulation (PSAM) used in a relay communication system with distributed space time block code (STBC) and amplify-and-forward protocol. We derive correlation coefficients between the channel coefficients and their estimates when the relay-to-destination link is either non-fading or fading, in terms of Doppler frequency, number of pilot symbols and SNR. This enables us to choose the optimum number of pilot symbols to compensate for the estimation error when the fading and Doppler effects are severe. Our performance analysis demonstrates that the presence of fading in the relay-to-destination link manifests itself by introducing additional Doppler frequency terms. Furthermore, we derive a tight lower bound for the bit error rate (BER) of BPSK modulation with channel estimation errors in terms of cross correlation coeffcients and the number of pilot symbols. Simulation results are also presented to validate our analytical results.

关键词： Cooperative systems Channel estimation Relays Fading Performance analysis Frequency estimation Bit error rate modulation coding Block codes Protocols

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Novel signaling scheme for 1x CDMA-based femtocell networks

Novel signaling scheme for 1x CDMA-based femtocell networks

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International Conference on Advanced Communication Technology (ICACT)

作者： Kuen-Chool Yoo Tae-Jin Lee School of Information and Communication Engineering Sungkyunkwan University Suwon South Korea

Femtocell networks can support iosolated coverage area and provide high data rates for mobile users by using wired Internet lines such as xDSL and cable TV networks for backhaul connectivity. Femtocell networks can be classified into 3GPP UMTS-based networks and 1x CDMA-based networks. Although 3GPP UMTS-based femtocells are standardized in the form of Home Node-B, 1x CDMA-based femtocells are not currently standardized. So, operators and communication system vendors are developing and launching such networks with proprietary specifications. From the viewpoint of an operator seeking to reduce its setup-costs, the adoption of the Femto Access GateWay (FAGW) is preferred. If femtocell networks based on the FAGW are adopted, an efficient signaling between the femtocells and the FAGW is required. The SIP-based signaling technique may suffer from an overload to support large number of femtocells. In this paper, we propose a novel signaling mechanism for FAGW and evaluate its performance in comparison with the SIP-based signaling method.

关键词： Femtocell networks Scheduling algorithm Physical layer WiMAX Quality of service Telecommunication traffic Traffic control Bandwidth Wireless networks modulation coding

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Fundamentals of coding and modulation Tutorial at ECOC 2009, Vienna, Austria

Fundamentals of Coding and Modulation Tutorial at ECOC 2009,...

引用

European Conference on Optical Communication (ECOC)

作者： Gerhard Kramer Department of Electrical Engineering-Systems University of Southern California USA

A collection of slides from the author presentation is presented. This paper discusses the fundamentals of channel coding, linear block codes, hard and soft decoding.

关键词： Tutorial modulation coding

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A novel coding-rotated-modulation OFDM scheme

A novel coding-rotated-modulation OFDM scheme

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IEEE International Conference on Communications Technology and Applications, ICCTA

作者： Zhanji Wu Tingting Fu Xu Wang liling Zhang Yunmeng Gao Cheng Ma Wenbo Wang Wireless Signal Processing and Network Laboratory Department of Information and Telecommunication Engineering Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781424448166

The increasing need of high data rate transmissions over fading channels has drawn attention to modulation schemes with high spectral efficiency such as the multidimensional rotated MPSK/QAM constellations. A novel coding-rotated-modulation OFDM (orthogonal frequency division multiplexing) scheme is proposed. The new scheme takes full advantage of the modulation diversity of rotated MPSK/ QAM (quadrature amplitude modulation), the frequency diversity of OFDM system and the coding-gain of Turbo codes all together. Simulation results have turned out this new scheme can significantly outperform the conventional BICM (bit-interleaved coded modulation)-OFDM scheme.

关键词： Fading Quadrature amplitude modulation OFDM modulation Frequency diversity modulation coding Intersymbol interference Turbo codes Multidimensional systems Amplitude modulation Code division multiplexing

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On the baseband hardware complexity of modernized GNSS receivers

On the baseband hardware complexity of modernized GNSS recei...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Nagaraj C Shivaramaiah Andrew G Dempster School of Surveying and Spatial Information Systems University of New South Wales Sydney NSW Australia

This paper discusses the resource and power requirements of baseband signal processing circuitry to process new Global Navigation Satellite Systems (GNSS) signals. The large signal bandwidth, multiple longer spreading codes and the split-spectrum modulations demand wider registers and wider accumulators at higher operating frequencies compared to the baseband hardware of the existing Global Positioning System (GPS) L1 Coarse/Acquisition (C/A) signal. Some of the signals with the memory spreading codes have a completely new requirement of up to 0.5 M memory bits. Implementation of the core baseband signal processing blocks in FPGA hardware reveals up to three times the resource requirement and up to thirty seven times the power consumption for high-end signals compared to the core baseband module of the existing L1 C/A signal.

关键词： Baseband Hardware Satellite navigation systems Signal processing Global Positioning System Circuits Bandwidth modulation coding Registers Frequency

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