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检索条件"主题词=Modulation coding"

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A Comprehensive Review of Quasi-Orthogonal Waveforms

A Comprehensive Review of Quasi-Orthogonal Waveforms

引用

IEEE National Conference on Radar

作者： Byron M. Keel J. Mike Baden Ted H. Heath Georgia Tech Research Institute Atlanta Georgia

Quasi-orthogonal waveforms which exhibit low cross-correlation responses have the potential to enhance radar performance. Intra-pulse, phase coded or frequency modulated waveforms, sharing the same frequency band, are of greatest interest. A review of quasi-orthogonal waveform design and performance is presented including bounds on auto and cross-correlation performance.

关键词： Radar Matched filters Frequency modulation Surface waves Phase modulation modulation coding Linear algebra Vectors Signal to noise ratio Frequency synthesizers

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Analysis and Comparison of Different SC-FDMA Schemes for 3GPP LTE

Analysis and Comparison of Different SC-FDMA Schemes for 3GP...

引用

International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Xiangning Fan Yuanjie Li Mingqi Li Xiaodong Zhang Southeast University Nanjing Jiangsu CN

Single-carrier FDMA (SC-FDMA) is a new kind of FDMA system which was proposed in recent years. It has the same PAPR as single-carrier system and its resource scheduling is as flexible as multi-carrier system. For comparison, the 3GPP LTE uplink scheme DFT-S-OFDM, and our new scheme DFT-S-GMC which is based on DFT and General Multi-Carrier (GMQ are analyzed and discussed in detail. Analysis and simulation results show that DFT-S-GMC is better than DFT-S-OFDM in Multiple Address Interference (MAI) performance. And the complexity of DFT-S-GMC is also reduced by using multi-band filter-banks.

关键词： Frequency division multiaccess Multiple access interference modulation coding Transmitters Robustness Peak to average power ratio OFDM Wireless communication Frequency diversity Performance analysis

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Differential space-time modulation based on quasi-orthogonal codes

Differential space-time modulation based on quasi-orthogonal...

引用

IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)

作者： Defu Sun Youxi Tang Shihai Shao Shaoqian Li National key Lab of Communications University of Electronic Science and Technology Chengdu China

This paper proposes a low complexity differential modulation scheme for multiple-antenna systems where neither the transmitter nor the receiver knows channel knowledge. Our scheme is based on quasi-orthogonal codes. We consider a wireless system with four transmit antennas. At the transmitter, symbol pairs are jointly mapped to construct quasi- orthogonal codes and the codes are used to perform differential encoding. At the receiver, a simple pair-wise decoder is derived to demodulate symbol pairs. We compare the bit error rate (BER) performance and computational complexity of our scheme with that of other differential detection schemes. Comparison results show that the proposed scheme has good performance and low decoding complexity.

关键词： modulation coding Transmitting antennas Tin Transmitters Decoding Receiving antennas Matrices Bit error rate Computational complexity Block codes

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Differential Detection of Serially Concatenated Precoded GMSK with Iterative Decoding

Differential Detection of Serially Concatenated Precoded GMS...

引用

IEEE Conference on Wireless Communications and Networking

作者： Richard Hsin-Hsyong Yang Shiunn-Jang Chern Zhi-Yuan Hsu Department of Computer and Communication Engineering National Kaohsiung First University of Science and Technology Kaohsiung Taiwan Taiwan Department of Electrical Eng National Sun Yat-Sen University Kaohsiung Taiwan

Differential detection for a serially concatenated coding system consists of an outer convolutional encoder, an interleaver and an inner rate-1 precoded Gaussian minimum-shift keying (GMSK) modulation is addressed. Using differential phase detector (DPD) combined with an iterative MAP (maximum a posteriori) decoding scheme is devised to improve the system performance. It is shown that the combination of GMSK modulation and DPD results in a feedforward tapped delay line. Therefore, a rate-1 recursive precoder is employed in front of the GMSK to produce a combined inner MAP decoder with a trellis of four states only. Numerical results show that the proposed scheme outperforms previous work about 2 dB in the AWGN channel and about 9 dB in the flat Rayleigh fading channel at BER is equal to 10 -4 respectively.

关键词： Concatenated codes Iterative decoding Convolutional codes modulation coding Phase detection Detectors System performance Delay lines AWGN channels Fading

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Carrier Frequency Offset Mitigation in a Proposed MIMO OFDM System

Carrier Frequency Offset Mitigation in a Proposed MIMO OFDM ...

引用

IEEE Long Island Systems, Applications and Technology Conference (LISAT)

作者： I-Tai Lu Hsin-Chang Wu Yongwen Yang Robert Olesen Polytechnic University Brooklyn NY USA InterDigital Communication Corporation King of Prussia PA USA

Carrier frequency offset (CFO) effects on the packet error rate performance of a proposed IEEE 802.11 n WLAN standard are investigated. With the maximum CFO (40 ppm) requirement specified by the standard, simulation results show that performance degradation is limited to within 1.5 dB for various TGn channels, modulation and coding schemes, transmit antenna excitation schemes and OFDM MIMO transceiver configurations. Comparisons between IEEE 802.11 a/g and a proposed IEEE 802.11 n WLAN standard on the coarse and fine CFO estimation errors are shown. The residual CFO effects on channel estimation error and packet error rate are also made.

关键词： MIMO Error analysis Wireless LAN Degradation modulation coding OFDM modulation Transmitting antennas Transceivers Estimation error Channel estimation

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Some UEP Concepts in coding and Physical Transport

Some UEP Concepts in Coding and Physical Transport

引用

Quality of Service, 2006 14th IEEE International Workshop on;Princeton,NJ

作者： Werner Henkel Neele von Deetzen Khaled Hassan Lucile Sassatelli David Declercq School of Engineering and Science Jacobs University Bremen Bremen Germany CNRS ETIS ENSEA/UCP/CNRS Cergy-Pontoise France

Unequal error protection is the key to future transport of multimedia data. The paper presents an overview of some new approaches realizing UEP properties in physical transport, especially multicarrier modulation, or with LDPC and Turbo codes. For multicarrier modulation, a UEP bit-loading method is described allowing for an arbitrary number of classes, arbitrary SNR margins between the classes and arbitrary number of bits per class. In Turbo coding, pruning, as a counterpart of puncturing is presented for more flexible bit-rate adaptations. Pruning is also the tool that leads to a construction approach for check-irregular LDPC codes with UEP properties.

关键词： Error correction codes Parity check codes Turbo codes Iterative algorithms Protection OFDM modulation Quantization Data engineering Jacobian matrices modulation coding

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Predistorted Pulse Width modulation Technique for Switching Signal Spectrum Management

Predistorted Pulse Width Modulation Technique for Switching ...

引用

Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： Xin Geng Philip T. Krein Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Urbana IL USA

Predistortion pulse-width modulation is proposed in this paper as a way to shape the spectrum of a switching signal. The key idea is to introduce a predistortion signal to the standard reference signal prior to a conventional triangle-comparison pulse-width modulator. A multicarrier and multisignal approach is employed to prevent low-frequency distortion in the switching signal. The approach can be used for spectral spreading of switching waveforms, for harmonic elimination, and for other applications. It avoids the distortion inherent in random switching methods. The method is much less computationally intensive than conventional harmonic elimination but adds flexibility. Experiments confirm the expected spectral performance.

关键词： Pulse width modulation Space vector pulse width modulation Radio spectrum management Power harmonic filters Switching frequency Pulse width modulation converters modulation coding Switching converters Pulse shaping methods Predistortion

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Iterative MIMO Detector Using a Group-Wise Approach

Iterative MIMO Detector Using a Group-Wise Approach

引用

Quality of Service, 2006 14th IEEE International Workshop on;Princeton,NJ

作者： John C. Koshy Joseph C. Liberti Timothy R. Hoerning Telcordia Technologies Inc. Red Bank NJ USA

For multiple-input multiple-output (MIMO) systems, space-time bit-interleaved coded modulation (ST-BICM) using iterative detection has been recognized as a method for achieving near-capacity performance. However, the a posteriori probability detector required for the conventional ST-BICM receiver is not amenable to practical implementation for high-rate MIMO due to its exponential complexity in rate. This motivated the development of a single-stream detector exhibiting polynomial complexity and capable of delivering performance comparable to the conventional detector under near-ideal conditions. However, under realistic operating scenarios, with possibly low-rank channel conditions and/or employing fewer receive antennas than transmitted streams, the performance gap between the single-stream detector and the conventional detector widens. With a view to enabling practical implementations of high-rate near-capacity MIMO, we propose a novel detector based on a group-wise approach that can be flexibly configured to deliver the best possible combination of performance and complexity over a wide range of realistic operating conditions.

关键词： Iterative methods MIMO Detectors Interleaved codes modulation coding Polynomials Search methods Collaboration Government Space technology

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Portable Bidirectional Optical Wireless Terminal with Organic Light Emitting Diode Display

Portable Bidirectional Optical Wireless Terminal with Organi...

引用

IEEE International Conference on Portable Information Devices, PORTABLE

作者： X. Lin H. Itoh Information Technology Research Institute AIST Koto Tokyo Japan Information Technology Research Institute AIST Aomi Koto Tokyo Japan

A portable information terminal can simultaneously display and transmit data/image bidirectionally in an indoor optical wireless communication environment.

关键词： Stimulated emission Organic light emitting diodes Flat panel displays Wireless communication Optical modulation Communication system control Cameras Integrated optics Optical filters modulation coding

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Multi-user TCP throughput in multi-rate cellular networks

Multi-user TCP throughput in multi-rate cellular networks

引用

Asia-Pacific Conference on Communications

作者： Wenjing Wang Mainak Chatterjee School of Electrical Engineering and Computer Science University of Central Florida Orlando FL USA

ISBN: (纸本)9781424413737;1424413737

In this paper, we consider a multi-rate cellular system like High Data Rate (HDR) and represent the state space using a Markov chain. We compute the transition probability of each state assuming that transition is possible between adjacent states. We focus on the TCP performance with a radio link protocol implemented that tries to hide channel related losses from TCR We use an M/G/l queuing model to capture the delay and throughput for different schedulers. We also illustrate how TCP throughput, link layer throughput, delay, and fairness are affected and dependent on parameters like number of users in the system and the underlying radio link protocol.

关键词： Throughput Land mobile radio cellular systems Base stations Delay Radio link Protocols Signal to noise ratio modulation coding Interference Probability

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