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检索条件"主题词=Modulation coding"

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A Framework of Cross-Layer Superposition Coded Multicast for Robust IPTV Services over WiMAX

A Framework of Cross-Layer Superposition Coded Multicast for...

引用

IEEE Conference on Wireless Communications and Networking

作者： James She Xiang Yu Fen Hou Pin-Han Ho En-Hui Yang Electrical & Computer Engineering University of Waterloo Canada

A cross-layer design (CLD) framework for robust and efficient video multicasting over IEEE 802.16 (or WiMAX) is introduced. In the framework, multiple description coding on scalable video bitstreams at the source for achieving multi-resolution robustness is jointly designed with superposition coding (i.e., multi-resolution modulation) on multicast signals at the channel to overcome the channel diversity problem in wireless multicast. The resulting cross-layer coded multicast signals enable us to recover some lost bitstreams in high quality layers, which is not possible if multi-resolution modulation is used alone for multicasting as in previous works. Simulation results show that indeed our joint design outperforms the scheme using only superposition coded multicast by achieving better video quality for users under multi-user channel diversity.

关键词： Robustness IPTV WiMAX Cross layer design modulation coding Receivers Multiresolution analysis Web and internet services Equations Automatic repeat request

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Performance analysis of a JTIDS/Link-16-type waveform transmitted over Nakagami fading channels with pulsed-noise interference

Performance analysis of a JTIDS/Link-16-type waveform transm...

引用

MILCOM, Military Communications Conference

作者： Chi-Han Kao Frank Kragh Clark Robertson Electrical and Computer Engineering Department Naval Postgraduate School Montreal CA USA

The Joint Tactical Information Distribution System (JTIDS) is the communication terminal of Link-16. JTIDS is a hybrid direct sequence/frequency-hopping spread spectrum system and features Reed-Solomon codes for channel coding, cyclic code-shift keying for 32-ary symbol modulation, minimum-shift keying for chip modulation, symbol interleaving, chip sequence scrambling and random jittering for transmission security, and a double-pulse structure for diversity. Assuming that coherent chip demodulation is practical, we investigate the probability of symbol error of a JTIDS/Link-16-type waveform for both the single- and the double-pulse structure transmitted over a slow, flat Nakagami fading channel in the presence of pulsed-noise interference (PNI) in this paper. In general, the results show that the double-pulse structure always outperforms the single-pulse structure, whether the PNI is present or not and whether the channel is fading or not. Furthermore, barrage noise interference has the most effect in degrading performance when signal-to-interference ratio (SIR) is small. When SIR is large, PNI with a smaller fraction of time that interference is on causes the greatest degradation.

关键词： Performance analysis Fading Interference modulation coding Degradation Frequency diversity Spread spectrum communication Reed-Solomon codes Channel coding Interleaved codes

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A New data coding method for wireless command transmission BPSK modulator in implantable neural signal acquisition system

A New data coding method for wireless command transmission B...

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IEEE Conference on Electron Devices and Solid-State Circuits

作者： Z. M. Lianga B. Lia Z. H. Wua Institute of Microelectronics School of Electronic and Information Engineering South China University of Technology WuShan China

In wireless implantable neural signal acquisition system, the transmitting of the configuration data to the internal module needs high reliability. Therefore, differential coding is often used in this data transmitting system. However, it requires highly reliable clock synchronization between the internal and external system, leading to the design extremely difficult. To solve this problem, a new data encoding method based on pulse width modulation is presented in this paper to make the internal and external modules can work at asynchronous system clocks with a clock detector designed to make the internal device fit the different clock frequencies. The new coding method is shown to be successful by a board circuit system and the testing results.

关键词： Binary phase shift keying modulation coding Clocks Pulse width modulation Circuit testing Frequency synchronization Encoding Space vector pulse width modulation Detectors System testing

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Study of different pulse waveforms and analytical probability of error in TH-PAM ultra wideband systems

Study of different pulse waveforms and analytical probabilit...

引用

International Design and Test Workshop

作者： Moez Hizem Ridha Bouallegue Research unity Systems of Telecommunication to SupCom Ariana Tunisia National Engineering School of Sousse Tunisia

This paper presents a method for the evaluation of the bit error probability of a time hopping binary pulse amplitude ultra-wideband modulation scheme. We will also study different pulse waveforms applicable in the context of UWB to see the characteristics of each one and the contribution they can provide when used in UWB applications.

关键词： Error analysis Ultra wideband technology Pulse modulation Amplitude modulation Pulse shaping methods Bandwidth Space vector pulse width modulation modulation coding Signal generators Frequency domain analysis

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FBL (Flexible Block-Wise Loading) algorithm for effective resource allocation in OFDMA systems with reduced uplink feedback information

FBL (Flexible Block-Wise Loading) algorithm for effective re...

引用

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

作者： TaeHyoung Sun YuPeng Wang KyungHi Chang The Graduate School ofIT& T Inha University Incheon South Korea

ISBN: (纸本)9781424426430

AMC (adaptive modulation and coding) is a well-known technique that selects a suitable modulation level and coding rate according to the userpsilas channel quality. The utilization of AMC in DL (downlink) requires the DL channel information of each user to properly select the MCS (modulation and coding scheme) level. However, under a practical OFDMA system environment, it is unsuitable to feed back all the channel information over the whole frequency resources due to the limited uplink bandwidth. In this paper, to optimize the performance of the AMC system we propose a FBL (flexible block-wise loading) algorithm combined with a novel CQI (channel quality information) feedback scheme with a reduced number of required bit. The proposed FBL algorithm dynamically allocates groups of sub-carriers to each user based on the channel quality information in a newly defined feedback signal format, thereby improving the sector throughput and outage probability performance.

关键词： Resource management Feedback modulation coding OFDM Throughput Scattering Feeds System performance Sun Downlink

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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...

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

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

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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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k-bit grouping moment balancing templates for spectral shaping codes

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

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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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