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检索条件"主题词=Modulation coding"

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Low-Complexity Near-Optimal Presence Detection of a Linearly Modulated Signal

Low-Complexity Near-Optimal Presence Detection of a Linearly...

引用

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Jeong Ho Yeo Joon Ho Cho Department of Electronic and Electrical Engineering Pohang University of Science and Technology Pohang Gyeongbuk South Korea

Spectrum sensing is an activity of a cognitive radio to detect the presence of a primary user in the frequency band of interest. In this paper, we consider under the Neyman-Pearson criterion the detection of a primary-user signal that linearly modulates codeword symbols from a Gaussian codebook. To reduce the complexity in computing the likelihood ratio, a simple method based on the approximation of signal covariance matrices is presented. By invoking the Central Limit Theorem, the approximate probability distribution of the decision statistic, the threshold for decision, and the performance of the proposed detector are computed and parameterized only by the overall pulse shape and noise variance. Numerical results show that the proposed detector with much lower computational complexity performs almost the same as the optimal detector. The signal-to-noise ratio wall of the proposed detector is also investigated to quantify the performance limit under uncertainty in the noise variance.

关键词： Detectors Noise shaping Signal to noise ratio Cognitive radio Frequency modulation coding Covariance matrix Probability distribution Statistical distributions Distributed computing

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The Application of RS code in CCK modulation Technology

The Application of RS code in CCK Modulation Technology

引用

International Conference on Information Science and Engineering (ICISE)

作者： Xi Su Ying Guo Telecommunication Engineering Institute Air Force Engineering University Xi'an China

RS code is a kind of linear block code. Due to its characteristics such as high capability in error correction, easy realization and so on, RS code has been widely applied in wireless communication systems. In this paper, the algorithms of RS encoding and decoding are introduced firstly, then they are applied to CCK(Complementary Code Keying) modulation system which based on 802.11b standard. The simulation results demonstrate that the applications of RS code can effectively reduce the error probability of CCK system over Gaussian white noise channel.

关键词： modulation coding Error correction Error correction codes Convolution Decoding Error probability Wireless communication Code standards White noise Parity check codes

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Blind Detection of Spread Spectrum Flow Watermarks

Blind Detection of Spread Spectrum Flow Watermarks

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IEEE Annual Joint Conference: INFOCOM, IEEE Computer and Communications Societies

作者： W. Jia F. P. Tso Z. Ling X. Fu D. Xuan W. Yu City University of Hong Kong Hong Kong China South-East University Nanjing China University of Massachusetts Lowell MA USA Ohio State Uinversity Columbus OH USA Cisco Systems Inc. TX USA

ISBN: (纸本)9781424435128

Recently, the direct sequence spread-spectrum (DSSS)-based technique has been proposed to trace anonymous network flows. In this technique, homogeneous pseudo-noise (PN) codes are used to modulate multiple-bit signals that are embedded into the target flow as watermarks. This technique could be maliciously used to degrade an anonymous communication network. In this paper, we propose a simple single flow-based scheme to detect the existence of these watermarks. Our investigation shows that even if we have no knowledge of the applied PN code, we are still able to detect malicious DSSS watermarks via mean-square autocorrelation (MSAC) of a single modulated flow's traffic rate time series. MSAC shows periodic peaks due to self-similarity in the modulated traffic caused by homogeneous PN codes that are used in modulating multiple-bit signals. Our scheme has low complexity and does not require any PN-code synchronization. We evaluate this detection scheme's effectiveness via simulations and real-world experiments on Tor. Our results demonstrate a high detection rate with a low false positive rate. Our scheme is more flexible and accurate than an existing multi-flow-based approach in DSSS watermark detection.

关键词： Spread spectrum communication Watermarking modulation coding Traffic control Communication networks Autocorrelation Telecommunication traffic Forensics Communications Society Degradation

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A Novel Semi-Dynamic Inter-Cell Interference Coordination Scheme Based on User Grouping

A Novel Semi-Dynamic Inter-Cell Interference Coordination Sc...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Li Li Dong Liang Wenbo Wang Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781424425143

This paper proposes a novel semi-dynamic inter-cell interference coordination (ICIC) scheme for multi-cell OFDMA systems. The objective of the novel scheme is to strike a balance between ICI minimization and frequency reuse factor (FRF) maximization. Firstly, we divide cell-edge users into non-overlapping user groups based on users' geometry, and classify each group's available bandwidth, which includes both orthogonal resource and non-orthogonal resource, into several ranks according to traffic load in neighboring groups. Then, different allocation strategies are applied correspondingly to different ranks of resource. The novel scheme achieves variant complexity and overhead according to traffic load. Simulation results show that the novel scheme can significantly enhance the cell edge throughput and reduce blocking probability, especially for networks with heavy-loaded spots in cell-edge area.

关键词： Interference Throughput Telecommunication traffic Bandwidth Resource management OFDM Degradation System performance modulation coding Signal processing

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A 4 × 4 unipolar Space-Time PPM-code with simplified decoding for IR-UWB transmissions

A 4 × 4 unipolar Space-Time PPM-code with simplified decodi...

引用

IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

作者： Chadi Abou-Rjeily Department of Electrical and Computer Engineering Lebanese American University Byblos Lebanon

In this paper, we propose a novel 4times4 space-time (ST) code that can be associated with impulse-radio ultra-wideband (IR-UWB) systems using pulse position modulation (PPM). The proposed rate-1 and fully diverse code can be applied with unipolar M-PPM constellations for all even values of M without introducing any constellation expansion. In other words, as in single-antenna IR-UWB systems, information is conveyed only by the time delays of the modulated sub-nanosecond pulses without introducing any amplitude amplification or phase rotation. An adapted simple maximum-likelihood (ML) decoder and diversity-preserving suboptimal decoders that take the structure of the proposed code into consideration are also presented.

关键词： Maximum likelihood decoding Pulse modulation Amplitude modulation Transmitting antennas Ultra wideband technology Transmitters Receiving antennas modulation coding Delay effects Phase modulation

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Low complexity soft detection for spatially multiplexed BICM MIMO OFDM system

Low complexity soft detection for spatially multiplexed BICM...

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

作者： Rizwan Ghaffar Raymond Knopp Eurecom Institute Sophia-Antipolis France

This paper presents a new approach to soft detection of spatial data streams in multiple input multiple output (MIMO) channels in slow fading channels. We focus on high spectral efficiency bit interleaved coded modulation (BICM) MIMO OFDM system where, after serial to parallel conversion and per antenna coding, spatial data streams are simultaneously transmitted by using an antenna array. We propose a detection algorithm based on a combination of linear and non linear detection techniques. The proposed algorithm orders spatial streams as per V-BLAST ordering and then uses linear detectors like MMSE or zero forcing (ZF) to detect the streams which have seen good channel realizations and therefore enjoy higher signal-to-noise-ratios (SNRs). These streams, after being detected, are subsequently stripped off leading to max log MAP detection of the streams which have seen comparatively poor realizations of the channel and consequently have lower SNRs. Unlike maximum likelihood (ML) detection, whose complexity is huge due to the need for enumerating all possible combinations of the transmitted constellation points, the proposed method has low complexity and moreover has a fully parallel structure suitable for the implementation in parallel hardware. Numerical examples illustrate the performance of proposed algorithm for slow fading 3times3 and 4times4 complex MIMO channels in comparison to linear and max log MAP detection.

关键词： MIMO Fading Transmitting antennas Maximum likelihood detection Interleaved codes modulation coding OFDM modulation Antenna arrays Detection algorithms Detectors

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Multipath division turbo equalization with block inter-carrier interference cancellation in cellular system with amplify-and-forward relaying

Multipath division turbo equalization with block inter-carri...

引用

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

作者： Katsuya Kato Ryota Yamada Takashi Yoshimoto Kazuyuki Shimezawa Minoru Kubota Naoki Okamoto Advanced Image & Telecommunication Laboratories Corporate Research and Development Group Sharp Corporation Japan

This paper proposes multipath division turbo equalization with block inter-carrier interference cancellation (MD-BIC) for orthogonal frequency division multiplexing (OFDM). When the multipath delay difference exceeds the cyclic prefix (CP) length, the OFDM transmission performance suffers severely due to inter-symbol interference (ISI) and inter-carrier interference (ICI). Cellular systems with amplify-and-forward (AF) relay stations, for example, might cause a long delay due to their process delays. Therefore, mobile terminals served by AF relay systems should compensate for the influence of ISI and ICI. MD-BIC divides a series of paths into several blocks by using a log likelihood ratio (LLR) that is computed in the decoding process. The delay difference within each block is limited so as not to exceed the CP length. This means that ISI and ICI are mitigated in each block. Computer simulations demonstrate that the proposed scheme can achieve excellent performance in the severe multipath channels where the delay difference is greater than the CP length.

关键词： Interference cancellation Relays Delay Intersymbol interference OFDM Decoding Signal processing Detectors Computer simulation modulation coding

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A Trellis-Coded modulation Scheme with a Novel Expanded 16-Dimensional Constant Envelope Q2PSK Constellation

A Trellis-Coded Modulation Scheme with a Novel Expanded 16-D...

引用

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Milton I. Quinteros Edit J. Kaminsky Kenneth V. Cartwright Department of Electrical Engineering EN 616A Lakefront Campus University of New Orleans New Orleans LA U.S.A School of Sciences and Technology College of The Bahamas Nassau N.P Bahamas

This paper presents a TCM scheme that uses a new expanded 16-Dimensional Constant Envelope Q 2 PSK constellation along with a simple convolutional encoder of rate 2/3. An effective gain of 2.67 dB over uncoded CEQ 2 PSK is achievable with low complexity, and without suffering from constellation expansion penalty. Larger coding gains are easily achieved with encoders of higher rates. In addition, an optimal hardware implementation of the required decoders is described.

关键词： Convolutional codes Multidimensional systems Constellation diagram Convolution Gain Hardware Decoding modulation coding Quadrature phase shift keying Lakes

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On Video Multicast in Cognitive Radio Networks

On Video Multicast in Cognitive Radio Networks

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IEEE Annual Joint Conference: INFOCOM, IEEE Computer and Communications Societies

作者： D. Hu S. Mao J. H. Reed Department of Electrical and Computer Engineering Aubum University Auburn AL USA The Bradley Department of Electrical and Computer Engineering Virginia Technology Blacksburg VA USA

ISBN: (纸本)9781424435128

We investigate the challenging problem of enabling multicast video service in emerging cognitive radio (CR) networks. We propose a cross-layer optimization approach to multicast video in CR networks. Specifically, we model CR video multicast as an optimization problem, while considering important design factors including scalable video coding, video rate control, spectrum sensing, dynamic spectrum access, modulation, scheduling, retransmission, and primary user protection. The objective is to optimize the overall received video quality as well as achieving proportional fairness among multicast users, while keeping the interference to primary users below a prescribed threshold. Although the problem can be solved using advanced optimization techniques, we propose a sequential fixing algorithm and a greedy algorithm with low complexity and proven optimality gap. Our simulations using MPEG-4 fine grained scalability (FGS) demonstrate the efficacy and superior performance of the proposed approach as compared with an alternative equal allocation scheme.

关键词： Cognitive radio Chromium Design optimization Video coding modulation coding Dynamic scheduling Protection Interference Multicast algorithms Greedy algorithms

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New transmission scheme with hierarchical modulation in dual-hop wireless relaying systems

New transmission scheme with hierarchical modulation in dual...

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Australasian Telecommunication Networks and Applications Conference, ATNAC

作者： Jeong-Chul Shin Jee-Hoon Kim Jin-Hyuk Song Hyoung-Kyu Song UT Communication Research Institute Sejong University Seoul South Korea

Dual-hop transmission is a technique by which the channel from the source to the destination is split into two possibly shorter links using other nodes. The source transmits signals to the destination via a group of nodes that act as relays. It is an effective technique when the direct link between the source and the destination is in deep fading, severe shadowing, or non-line-of-sight (NLOS) environment. In this network, the reliability of the communications is improved whereas the throughput might go down since the transmission is performed by two times. In this paper, we propose a scheme that uses hierarchical modulation at the source and selective modulation based on cyclic redundancy check (CRC) code at the relays. Simulation results show that our scheme outperforms conventional schemes in terms of the bit error rate (BER) and throughput performances.

关键词： Relays Throughput modulation coding Bit error rate Fading Wireless networks Shadow mapping Telecommunication network reliability Cyclic redundancy check codes Cyclic redundancy check

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