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检索条件"主题词=Modulation coding"

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Bandwidth Efficiency of Practical MIMO-OFDM Systems with Adaptive MIMO Schemes

Bandwidth Efficiency of Practical MIMO-OFDM Systems with Ada...

引用

IEEE International Conference on Communications (ICC)

作者： A. Camargo D. Yao A. Czylwik Department of Communication Systems (NTS) University of Duisburg-Essen Bismarckstr Duisburg Germany Dept. of Commun. Syst. (NTS) Univ. of Duisburg-Essen Duisburg Germany

This paper considers the practical multiple-input multiple-output systems with orthogonal frequency division multiplexing (MIMO-OFDM) and bit-interleaved coded modulation (BICM) in spatially correlated broadband channels. Using link adaption techniques, the MIMO scheme that better exploits the space and frequency characteristics of the encountered channel condition is selected. It is shown that the bandwidth efficiency is increased compared to systems with fixed MIMO schemes in all propagation scenarios, while maintaining a predefined link quality. Furthermore, the adaptive transmission in channels with low spatial correlation can attain the complete multiplexing gain, whereas the finite set of modulation and coding schemes restricts the multiplexing gain that can be extracted when the spatial correlation is large.

关键词： Bandwidth Adaptive systems MIMO Samarium modulation coding Receiving antennas OFDM modulation Radio transmitters Transmitting antennas Antennas and propagation

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Cross-layer link adaptation for IEEE 802.11n

Cross-layer link adaptation for IEEE 802.11n

引用

International Workshop on Cross Layer Design, IWCLD

作者： Gabriel Martorell Felip Riera-Palou Guillem Femenias Mobile Communications Group University of Balearic Islands Spain

This paper considers the use of cross-layer MIMO fast link adaption (FLA) algorithms in the context of IEEE 802.11n. An FLA technique based on packet error rate (PER) that makes use of the exponential effective SNR mapping (EESM) is proposed. Additionally, a bit error rate (BER) based FLA scheme is proposed that simplifies the calibration procedure without any significant performance degradation. Results show that both, PER- and BER-based, FLA techniques select the modulation and coding scheme (MCS) in a close to optimum fashion in the sense of maximising the data throughput while satisfying a prescribed packet error rate (PER) target. Channel estimation errors have also been considered, revealing the importance of good channel estimators in order for FLA strategies to work satisfactorily.

关键词： MIMO Physical layer modulation coding Switches Error analysis Throughput OFDM modulation Signal to noise ratio Bit error rate Wireless LAN

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Designing high-speed, low-chirp, low-distortion microring modulators

Designing high-speed, low-chirp, low-distortion microring mo...

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： Wesley D. Sacher Joyce K. S. Poon Department of Electrical and Computer Engineering and Institute for Optical Sciences University of Toronto Toronto ONT Canada

We show that microring modulators with variable coupling strengths can have low distortion, zero chirp, high extinction ratios, and large modulation rates only limited by the coupler or the free spectral range of the ... 详细信息

关键词： Optical resonators Chirp modulation Optical coupling modulation coding Optical distortion Optical modulation High speed optical techniques Integrated optics Optical interferometry Optical devices

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Scalable video multicast in multi-carrier wireless data systems

Scalable video multicast in multi-carrier wireless data syst...

引用

International Conference on Network Protocols

作者： Peilong Li Honghai Zhang Baohua Zhao Sampath Rangarajan Department of Computer Science and Technology University of Science and Technology China NEC Laboratories USA

ISBN: (纸本)9781424446353

Future 4G cellular networks are featured with high data rate and improved coverage, which will enable realtime video multicast and broadcast services. Scalable video coding is very appropriate for wireless multicast service because it allows to choose different modulation and coding schemes (MCSs) for different video layers and can provide good video quality to users in good channel conditions while still maintaining reasonable video quality for other users. In order to apply scalable video coding to wireless multicast streaming, it is important to choose appropriate MCS for each video layer and to determine the right resource allocation among multiple video sessions. In this paper we propose a two-step dynamic programming algorithm that finds the optimal total system utility of all users where the system utility can be a generic non-negative, non-decreasing function of received rate. Our algorithm supports variable layer size and thus allows flexibility during the video encoding process. Simulation results show that our algorithm offers significant improvement on the video quality over a naive algorithm and an adapted greedy algorithm, especially in the scenarios with multiple real video sequences and limited radio resources.

关键词： Data systems Video coding Land mobile radio cellular systems Multimedia communication Broadcasting modulation coding Streaming media Resource management Dynamic programming Heuristic algorithms

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Efficient design of convolutional interleavers in MPEG-4 image wireless transmission systems

Efficient design of convolutional interleavers in MPEG-4 ima...

引用

International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON

作者： Srijidtra Mahapakulchai Teenarat Anuchat Department of Electrical Engineering Kasetsart University Bangkok Thailand

We implement the convolutional interleavers into MPEG-4 image transmission systems for the Rician fading channels. The objective of this paper is to illustrate the performance differences between applying the convolutional interleavers and our previously designed random interleavers. The simulation results show some improvement on the PSNR performance of about 1.4-5 dB for the case of the slow fading channels.

关键词： MPEG 4 Standard Convolutional codes Convolution Maximum likelihood decoding Rician channels modulation coding Wavelet coefficients Image communication Frequency Signal to noise ratio

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BER Performance Evaluation of Tail-Biting Convolution coding Applied to Companded QPSK Mobile WiMax

BER Performance Evaluation of Tail-Biting Convolution Coding...

引用

International Conference on Parallel and Distributed Systems (ICPADS)

作者： Brian G. Stewart Athinarayanan Vallavaraj Glasgow Caledonian University Glasgow UK Caledonian College of Engineering Muscat Oman

A Bit-Error-Rate (BER) performance evaluation is presented for mu-Law companded QPSK modulated Mobile WiMax (IEEE802.16e) employing tail-biting convolutional coding (TBCC). The Down Link (DL) Partially Used Subcarrier (PUSC) deployment has been considered for this investigation. Equalized symbol power transmissions for uncompanded and mu-Law companded WiMax scenarios employing mu = 0.1, 1, 3, 10, 30, 100, 255, 1000, and 3000 has been undertaken. It is shown that for 30 clusters each carrying 48 bits of random data, the improvement in SNR for TBCC using the convolutional code (7, 171, 133) is best for uncompanded WiMax and deteriorates slightly for companded WiMax situations. The maximum improvement in SNR at the 0.001 BER probability level is ~1.7 dB, whilst at the 0.0001 BER probability level the improvement is ~2.9 dB. As companded BER rates for smaller values of mu are only slightly degraded over normal WiMax BER rates, then TBCC for small values of mu may be used to provide improved SNR performance over normal convolutional coding (CC) WiMax situations. Importantly, small values of mu can also provide improved Peak-to-Average Power Ratio (PAPR) but for larger values of mu, where significant PAPR reduction can be obtained, the improved performance of TBCC does not provide sufficient SNR gain to improve upon the standard CC WiMax performance.

关键词： Bit error rate Convolution Quadrature phase shift keying WiMAX Convolutional codes Peak to average power ratio modulation coding Power transmission Degradation Performance gain

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Hybrid amplitude/phase/polarization coded modulation for 100 Gb/s optical transmission and beyond

Hybrid amplitude/phase/polarization coded modulation for 100...

引用

IEEE Photonics Conference (IPC)

作者： Hussam G. Batshon Ivan B. Djordjevic Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA

In this paper, we propose a novel hybrid amplitude/phase/polarization (HAPP) LDPC-coded-modulation-scheme suitable to achieve 100 Gb/s optical transmission rate and beyond with coding gain of 7 dB and above. The propo... 详细信息

关键词： Optical polarization Phase modulation Amplitude modulation modulation coding Optical modulation Parity check codes Nonlinear optics Optical transmitters Gain Bit error rate

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Effective techniques for blind phase offset estimation in LDPC coded systems

Effective techniques for blind phase offset estimation in LD...

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IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

作者： Rodrigue Imad Sebastien Houcke Mounir Ghogho Institut Telecom Telecom Bretagne UMR CNRS Lab-STICC Brest France School of Electronic and Electrical Engineering University of Leeds UK

We consider the problem of carrier phase offset estimation and propose two blind estimation techniques for low-density parity-check (LDPC) coded systems. The first technique is applied to a binary phase shift keying (BPSK) modulation while the second is applied to higher order modulations. These techniques are based on the calculation and minimization of functions of the log-likelihood ratios (LLR) of the syndrome elements obtained according to the parity check matrix of the error correcting code. In the case of a BPSK modulation, the global minimum of the cost function is obtained using the gradient descent method while for higher order modulations, we use the simulated annealing algorithm. Simulation results show that the proposed techniques significantly outperform many phase estimation methods and are very powerful even at low signal-to-noise ratios.

关键词： Phase estimation Parity check codes Binary phase shift keying Phase modulation Cost function Simulated annealing Error correction codes Signal to noise ratio Telecommunications modulation coding

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Contentious Feedback in Cellular Systems

Contentious Feedback in Cellular Systems

引用

IEEE Conference on Wireless Communications and Networking

作者： Alex Reznik Eldad Zeira InterDigital King of Prussia PA USA InterDigital Melville NY USA

We consider the problem of counting mobile stations based on feedback they provide. For this problem we propose an anonymous contentious feedback mechanism which permits efficient counting and relate the resulting estimation problem to a well know combinatorial problem of "coupon collection." Using this relationship, we analyze the estimation problem in an idealized setting. We find the ML estimator and demonstrate that it is inappropriate in this setting. We then propose an estimator which is shown to achieve good performance over a large range of parameters.

关键词： Feedback Maximum likelihood estimation Convergence Communications Society Cellular networks Base stations Signal design modulation coding OFDM modulation Multiaccess communication

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An Energy-Efficient Physical Layer Adaptive modulation Scheme for Wireless Sensor Networks

An Energy-Efficient Physical Layer Adaptive Modulation Schem...

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International Conference on Information Science and Engineering (ICISE)

作者： Yadong Yu Rong Zhu Jingjing Dai Shaoxing Univ. Shaoxing China Nat. Eng. Res. Center For Multimedia Software WuHan Univ. Wuhan China

Wireless Sensor Networks pose numerous design challenges. They require long term, robust sensing for many applications. One important challenge is to design sensor networks that have long system lifetimes. Since the radio has the greatest impact on the energy consumption of the WSNs node, we present a physical layer adaptive channel coding and modulation scheme to lower the number of retransmission of package, then decrease the number of retransmission data because of error. So the energy consumption of the WSNs node can be saved and lifetime of the network is been extended. Experiment results show that the total amount of bits that are sent can be reduced by employing this scheme.

关键词： Energy efficiency Physical layer Wireless sensor networks Energy consumption modulation coding Forward error correction Channel coding Power engineering and energy Packaging Automatic repeat request

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