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检索条件"主题词=Modulation coding"

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Efficient methods for symbol synchronization and AMC mode selection in OFDM systems

Efficient methods for symbol synchronization and AMC mode se...

引用

International Conference on Advanced Technologies for Communications, ATC

作者： Seong Jin Park Sung Ho Cho Min Soo Kang Division of Electrical & Computer Engineering Hanyang University Seoul South Korea Division of Information & Communication Engineering Hanyang Cyber University Seoul South Korea

This paper presents a symbol synchronization algorithm in the multi-mode orthogonal frequency division multiplexing (OFDM) systems. Efficient system reconfiguration algorithm applying to the adaptive modulation and coding (AMC) method is also presented. The algorithm for the symbol synchronization uses the shorter repetition period for computing correlation values than existing methods. It can reduce the computational complexity and the estimation delay time. We confirm the performance of the algorithm by using the baseband platform equipped with TMS320C6416 DSP chip. After the synchronization process, we propose the efficient AMC method that use throughput based on the channel characteristic. It changes the modulation process and coding rate dynamically. We measure the throughput of the AMC applied to the system reconfiguration algorithm.

关键词： Frequency synchronization modulation coding Delay estimation Throughput OFDM modulation Computational complexity Delay effects Baseband Digital signal processing chips Semiconductor device measurement

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Intelligent Weather Systems with Fuzzy Logic Controller for Satellite Networks

Intelligent Weather Systems with Fuzzy Logic Controller for ...

引用

IEEE Conference on Wireless Communications and Networking

作者： Kamal Harb Changcheng Huang Anand Srinivasan Brian Cheng Carleton University Ottawa ONT Canada EION Wireless Ottawa ONT Canada

Weather attenuations can have a distorting effect on signal fidelity above 10 GHz that lead to excessive digital transmission error. This loss of signal is commonly referred to as signal attenuation. Signal attenuation impacts QoS in wireless and satellite networks. An intelligent decision support system is therefore necessary for service providers by accurately calculating rain, gaseous, cloud, fog, and scintillation attenuations using predicted signal-weather correlated database in collaboration with ITU-R propagation models combined with gateway, and ground terminal characteristics. The effect becomes a key feature in adjusting and improving satellite signal power, modulation and coding schemes, monitored and controlled altogether by a powerful and efficient intelligent-based attenuation countermeasure system. A three dimensional relationship is proposed among these attenuations with respect to propagation angle and rainfall rate (Harb et al., 2007). The result pilots an enhanced back propagation-learning algorithm that is used to iteratively tune the intelligent controller based on fuzzy logic technique with returned SNR values for activating the weighted modulation/Codepoint to its optimal values, depending on actual or predicted weather conditions, configuration settings and tolerance/safety margins for SLA commitment.

关键词： Intelligent systems Intelligent networks Fuzzy logic Control systems Satellites Attenuation modulation coding Distortion Deductive databases Decision support systems

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A simulation study of Block Acknowledgements and TXOPs under varying channel conditions

A simulation study of Block Acknowledgements and TXOPs under...

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IEEE International Conference on Multi Topic

作者： Rashid Faruqui Sayeed Ghani Karachi Campus and Institute of Business Administration Bahria University Karachi Pakistan Institute of Business Administration Karachi Pakistan

The acknowledgment schemes of legacy 802.11 do not support optimized performance due to high overheads. The performance further deteriorates for real time traffic. Transmission opportunity (TXOP) mechanism and Block Acknowledgements (Acks) were later introduced to facilitate improved performance in 802.11e. In this paper we aim to prove the effectiveness of both TXOP and Block Ack and analyze their effects under varying channel conditions through simulations carried out in NS-2.

关键词： Traffic control Throughput Media Access Protocol Quality of service Access protocols Automatic repeat request Bit error rate Analytical models Delay effects modulation coding

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Performance of BICM-OFDM Systems in Non-Gaussian Noise and Interference

Performance of BICM-OFDM Systems in Non-Gaussian Noise and I...

引用

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

作者： Amir Nasri Robert Schober University of British Columbia Canada

In this paper, we present a general mathematical framework for performance analysis of systems employing bit-interleaved coded modulation (BICM) and orthogonal frequency division multiplexing (OFDM). The proposed analysis is general enough to include impairment by general types of noise and interference with finite moments such as additive white Gaussian noise (AWGN), Gaussian mixture noise, narrowband interference, and ultra-wideband interference. We present an asymptotically tight upper bound for the bit error rate (BER) and a closed-form expression for the asymptotic BER at high signal-to-noise ratios. Our analysis shows that, if the popular Euclidean distance metric is used for Viterbi decoding, BICM-OFDM systems optimized for AWGN are also optimum for any other type of noise and interference with finite moments.

关键词： Interference Additive white noise Gaussian noise AWGN Bit error rate Performance analysis Interleaved codes modulation coding OFDM modulation Narrowband

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BER performance analysis of a Cooperative BICM system based on post-BSC model

BER performance analysis of a Cooperative BICM system based ...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Reza Hoshyar Rahim Tafazolli Centre for Communication Systems Research (CCSR) Department of Electronic Engineering Centre for Communication Systems Research (CCSR) Department of Electronic Engineering University Of Surrey Guildford Surrey UK

A generic cooperative BICM system is described and an analytical model capturing relay error through a binary symmetric channel (BSC) is presented. The analytical model is called Post-BSC model as the BSC channel is placed after encoder of the relay node. Tight BER upper bound is derived for the presented model and close match between simulation and analysis for the presented model is observed. However it is also observed that the proposed model is optimistic and fails to effectively model the original system at low SNR conditions of the source to relay link. Despite this fact the incorporation of the Post-BSC model based maximum likelihood decoding greatly improves the system BER with respect to the original DF scheme.

关键词： Bit error rate Performance analysis Relays modulation coding Protocols Analytical models Maximum likelihood decoding Binary codes Upper bound Interleaved codes

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Two-Layer Phase coding Interference Cancellation Enhancement of Uplink Broadband Wireless Access System

Two-Layer Phase Coding Interference Cancellation Enhancement...

引用

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

作者： Thanh Son Le WITELCOM AS Moss

Multi-carrier OFDM-CDMA has a range of advantages that are ideal for high data rate wireless access system. A two-layer carrier interferometry (CI) phase coding approach is proposed for enhancing multi-user detection of millimeter wavelength multi-carrier OFDM-CDMA based uplink broadband wireless access system (BWA). The proposed OFDM-CDMA scheme uses a two-layer CI phase coding structure, which comprises outer and inner CI modulations and is combined with iterative interference cancellation and detection to boost the system capability in high fading radio channel and strong multiple access interference environment. Orthogonal property of two-layer CI signals is exploited to enhance diversities in time, frequency and spreading code domains, as well as to mitigate peak-to-average power problem and to simplify signal processing. The proposed two-layer CI OFDM-CDMA scheme for the uplink BWA is mathematically analyzed. Effects of frequency synchronization errors to the scheme are studied. Numeric simulations are carried out to evaluate the system performance. The simulation results show the superior characteristics of the proposed two-layer CI phase coding scheme for the uplink BWA system compared to other schemes.

关键词： Interference cancellation Signal processing Interferometry Multiuser detection Phase modulation modulation coding Phase detection Fading Multiple access interference Frequency diversity

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k-bit grouping moment balancing templates for spectral shaping codes

k-bit grouping moment balancing templates for spectral shapi...

引用

IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： Ling Cheng Hendrik C. Ferreira Khmaies Ouahada Department of Electrical and Electronic Engineering Science University of Johannesburg Auckland Park South Africa

We investigate moment balancing templates for spectral shaping codes, e.g., dc-free codes, high-order spectral-null codes and spectral nulls code. A new approach by adding k grouped bits at determinate indices of the code word is found to balance the moment of the code word. Moment balanced code words preserve the spectral-null properties and can guarantee to correct one insertion or deletion error. The redundancy, which is a constant factor greater than that of the universal template for uncoded sequence, can be kept small. The new approach also involves the application of the optimized moment balancing template and the non-binary enumeration of balancing moment values.

关键词： Frequency Error correction codes Africa Redundancy Digital communication Optical modulation Optical recording Magnetic recording Magnetic modulators modulation coding

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Performance analysis of an alternative to trellis coded modulation for a waveform transmitted over a channel with pulse-noise interference

Performance analysis of an alternative to trellis coded modu...

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MILCOM, Military Communications Conference

作者： Mario Marques R. Clark Robertson Department of Electrical and Computer Engineering Graduate School of Engineering and Applied Sciences Naval Postgraduate School Montreal CA USA

The performance of a communication system having almost the same spectral efficiency as a trellis coded modulation (TCM) system with r = 2/3 convolutional encoding and 8-ary phase-shift keying (8-PSK) modulation is investigated. TCM is a common solution to the problem of adding forward error correction (FEC) coding without an attendant increase in channel bandwidth. The primary drawback to TCM is that the achievable coding gain is limited by the maximum practical number of states in the convolutional encoder. The alternative system considered uses (63, 37) Reed-Solomon (RS) encoding. The six-bit symbols at the output of the Reed-Solomon encoder undergo serial-to-parallel conversion to two three-bit symbols, which are then independently transmitted on the in-phase and quadrature components of the carrier using 8-ary biorthogonal keying. This system has a null-to-null bandwidth of 0.993R b , which is 0.7% smaller than TCM with r = 2/3 convolutional encoding and 8-PSK modulation. The two waveforms are compared for the relatively benign case where additive white Gaussian noise is the only noise present as well as when pulse-noise interference is present.

关键词： Pulse modulation Performance analysis modulation coding Interference Convolutional codes Phase modulation Forward error correction Bandwidth Reed-Solomon codes Additive white noise

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WCDMA physical layer modeling for the MUOS project

WCDMA physical layer modeling for the MUOS project

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MILCOM, Military Communications Conference

作者： John S. Sadowsky General Dynamics C4 Systems Scottsdale AZ USA

The mobile user objective system (MUOS) uses WCDMA as a basis for its waveform definition. This paper deals with the quasi-analytic method of WCDMA physical layer simulation that has been used extensively for performance simulation, model development for system simulation and development of signal processing algorithms on the MUOS project. Quasi-analytic method offers speedup factors, relative to conventional waveform simulation, of 100x or more. It is shown here that quasi-analytic can also be very accurate.

关键词： Multiaccess communication Physical layer Fingers modulation coding Modems Signal processing Finite impulse response filter Decoding Computational modeling Demodulation

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Optimized Frame Packing for OFDMA Systems

Optimized Frame Packing for OFDMA Systems

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IEEE Conference on Vehicular Technology (VTC)

作者： Marc C. Necker Martin Kohn Andreas Reifert Joachim Scharf Jorg Sommer Institute of Communication Networks and Computer Engineering University of Stuttgart Stuttgart Germany

Orthogonal frequency division multiple access (OFDMA) is the basis for several emerging wireless systems, such as 802.16e (WiMAX) or 3GPP long term evolution (LTE). In OFDMA, different users are multiplexed in time and frequency. In the 802.16e adaptive modulation and coding (AMC) downlink, the data bursts for a particular terminal have a rectangular shape and need to be placed in the two-dimensional time/frequency plane. The position and shape of the rectangles is arbitrary, and it is the task of the frame packer to pack the frame efficiently, wasting as little space as possible. In this paper, we treat the frame packing problem as a strip-packing problem. We solve this combinatorial optimization problem by developing a suitable representation for a genetic algorithm. This algorithm can reach within 5% of the theoretical lower bound for the packing efficiency.

关键词： Downlink OFDM Frequency conversion WiMAX Long Term Evolution modulation coding Shape Genetic algorithms Space technology Communication networks

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