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检索条件"主题词=Modulation coding"

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Adaptive power loading for OFDM cooperative networks

Adaptive power loading for OFDM cooperative networks

引用

Canadian Workshop on Information Theory (CWIT)

作者： Osama Amin Murat Uysal Department of Electrical and Computer Engineering University of Waterloo ONT Canada

In this paper, we investigate power allocation strategies for an orthogonal frequency division multiplexing (OFDM) cooperative network over frequency-selective fading channels. Assuming amplify-and-forward relaying, we propose a power loading algorithm to minimize the bit error rate under total transmission power constraint for a given data rate. We consider both uncoded ODFM and OFDM encoupled with bit-interleaved coded modulation. Our Monte Carlo simulation study demonstrates significant performance gains through power loading. The impact of several practical issues on the error rate performance such as imperfect channel estimation and limited feedback is further investigated.

关键词： Frequency-selective fading channels Relays Bit error rate Interleaved codes modulation coding OFDM modulation Performance gain Error analysis Channel estimation Feedback

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A region-specific QIM-based watermarking scheme for digital images

A region-specific QIM-based watermarking scheme for digital ...

引用

IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)

作者： Lino Coria Panos Nasiopoulos Rabab Ward Electronics Systems and Informatics Department Instituto Tecnológicoy de Estudios Superiores de Occidente Jalisco Mexico Electrical and Computer Engineering Department University of British Columbia Vancouver BC Canada

Angle Quantization Index modulation (AQIM) is a watermarking technique that achieves provably good capacity-distortion-robustness performance. The scheme embeds each bit of a watermark message on an image by quantizing the angle formed by a vector of pixels or frequency coefficients from the host image with the origin of a hyperspherical coordinate system. While it has been demonstrated that AQIM is insensitive to intensity scaling attacks, the quantization step employed throughout the embedding process is set to a constant value regardless of the nature of the image. Because of this, the perceptual quality of the watermarked image cannot be regulated. In this paper, we propose a straightforward yet powerful AQIM-based watermarking scheme that considers the statistical behavior of the region where a message bit is to be embedded before settling on the size of the quantization step. Experimental results show that, for the same watermark capacity and image fidelity parameters, our proposed region-specific scheme exhibits a lower bit error rate than the regular AQIM approach.

关键词： Watermarking Digital images Quantization Image coding Robustness Multidimensional systems Convolutional codes modulation coding Frequency Pixel

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Differential network coding in wireless networks

Differential network coding in wireless networks

引用

IEEE Signal Processing and Communications Applications (SIU)

作者： Ozgur Ozdemir Ali Ozgur Yilmaz Elektrik ve Elektronik Muhendisligi Bolumu Selcuk Universitesi Turkey Elektrik ve Elektronik Muhendisligi Bolumu Orta Dogu Teknik Universitesi Turkey

In this paper a three-terminal communication scenario where two users exchange information by employing differential binary modulation and network coding via a relay is considered. The transmission is divided into three slots in time where the first and second slots are allocated to the transmission of differential encoded data of the users. After demodulation, the relay broadcasts the bit-wise XOR-ed and differential encoded packet to the users in the third slot. The optimum detector and a simplified decision algorithm are derived based on the maximum likelihood rule. The numerical results for Rayleigh fading show that both of the proposed algorithms provide full diversity order. The simulations also demonstrate that the proposed differential network coded transmission not only offers a sum-rate gain of up to 4/3 compared to classical bi-directional relaying with four communication slots but also provides better BER performance as the signal to noise ratio increases.

关键词： Network coding Wireless networks Relays Maximum likelihood detection modulation coding Demodulation Broadcasting Detectors Rayleigh channels Performance gain

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Design and performance evaluation of golden interleaving schemes for BICM-ID

Design and performance evaluation of golden interleaving sch...

引用

International Conference on Bio-Inspired Computing: Theories and Applications, BICTA

作者： Xuelan Zou Weiyan Liu Bin Liu Department of Electronic and Information Engineering Zhejiang Institute of Communication and Media Hangzhou China Department of Information Engineering Jiangsu City Vocation College Nanjing China Department of Media and Communications Jiangsu City Vocation College Nanjing China

Bit-interleaved coded modulation with iterative decoding (BICM-ID) is suitable for the next-generation wireless communication systems. BICM-ID is a bandwidth efficient transmission scheme. And the high performance of BICM-ID depends on the interleaver design. This paper focuses on the design of golden based interleaving schemes in BICM-ID systems. It shows that the golden interleaver and the dithered golden interleaver are not good for BICM-ID when the signal to noise ratio (SNR) is low. While the golden-chaotic interleaver has better performance than the golden and dithered golden interleaver and it also outperforms the random interleaver which is usually used in a BICM-ID system. The effect of the design parameter on the performance of the dithered golden interleaver and the golden-chaotic interleaver is also discussed in the paper. Performance analysis based on the normalized dispersion is provided in the paper and the accuracy of the dispersion analysis is verified by simulation results both in the additive white Gaussian noise (AWGN) channel and Rayleigh fading channels.

关键词： Interleaved codes AWGN Signal to noise ratio Performance analysis modulation coding Iterative decoding Wireless communication Bandwidth Analytical models Additive white noise

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Iterative narrowband jamming rejection technique for coded OFDMA-CDM systems

Iterative narrowband jamming rejection technique for coded O...

引用

MILCOM, Military Communications Conference

作者： Duho Rhee Byung Hoon Ko Kwang Soon Kim Department of Electrical and Electronic Engineering Yonsei University Seoul Korea Dept. of Electr. & Electron. Eng. Yonsei Univ. Seoul South Korea

The robustness to jamming signal is an important property for military communication systems. Some previous work has shown that the frequency domain code division multiplexing (CDM) efficiently rejects the interference. In general, however, the jamming signal has higher power than ordinary interference which leads to insufficient jamming rejection performance of these schemes. To mitigate this insufficiency, we propose optimal receiver structures in mean sqaure error (MSE) sense in the presence of narrowband jamming signal. Also these receivers are extended to iterative regime. By this approach, high power narrowband jamming signal could be efficiently rejected.

关键词： Narrowband Jamming Interference Robustness OFDM Frequency diversity Fading Military communication Multicarrier code division multiple access modulation coding

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Fuzzy Q-Learning-Based Hybrid ARQ for High Speed Downlink Packet Access

Fuzzy Q-Learning-Based Hybrid ARQ for High Speed Downlink Pa...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Chiao-Yin Huang Wen-Ching Chung Chung-Ju Chang Fang-Ching Ren Department of Communication Engineering National Chiao Tung University Hsinchu Taiwan Industrial Technology Research Institute Hsinchu Taiwan

ISBN: (纸本)9781424425143

In this paper, a fuzzy Q-learning-based hybrid automatic repeat request (FQL-HARQ) scheme is proposed to enhance the system performance of high speed downlink packet access (HSDPA) in universal mobile telecommunications system (UMTS). In the HSDPA system, it is an important issue to choose modulation and coding scheme (MCS) for new data packet when channel quality indicator (CQI) is inaccurate. Hence, the purpose of the FQL-HARQ scheme is to determine a suitable MCS for new data packet so as to maximize the system throughput while guarantee the block error rate (BLER) requirement. In the FQL-HARQ scheme, the fuzzy logic is used to choose a suitable MCS for each new data packet. According to the feedback information from the HSDPA system, the Q-learning algorithm is adopted to update fuzzy rule base. This makes the FQL-HARQ scheme can adapt to the variation of environment. Simulation results show that the proposed scheme can increase the system throughput of up to 70% compared to the conventional adaptive method in the case with CQI report delay.

关键词： Automatic repeat request Downlink Multiaccess communication Fuzzy systems Throughput System performance 3G mobile communication modulation coding Error analysis Fuzzy logic

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On the Average Output SNR of Exponential Effective SNR Mapping over Nakagami-m Fading Channels

On the Average Output SNR of Exponential Effective SNR Mappi...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Hui Song Raymond Kwan Jie Zhang Centre of Wireless Network Design University of Bedfordshire Luton UK

ISBN: (纸本)9781424425143

A novel expression of the moment generating function (MGF) of the exponential effective SNR mapping (EESM) signal-to-noise ratio (SNR) over two correlated but not necessarily identically distributed Nakagami-m fading channels is presented. Based on the MGF, a novel expression for the average effective SNR is also presented. Numerical evaluation of these expressions shows that the proposed approach can be a useful and efficient analytical tool in analyzing the characteristics of EESM over correlated Nakagami-m fading channels.

关键词： Fading Signal to noise ratio OFDM modulation Signal mapping modulation coding Frequency estimation Random variables Wireless networks Signal design Signal generators

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Asymptotic BER bounds for BICM-based multiple relay cooperative network under AWGN and rayleigh fading channels

Asymptotic BER bounds for BICM-based multiple relay cooperat...

引用

International Conference on Communications and Networking in China (CHINACOM)

作者： Shujaat Ali Khan Tanoli Imran Khan Nandana Rajatheva School of Engineering and Technology Asian Institute of Technology Pathum Thani Thailand

This paper contains the performance analysis of a Bit Interleaved Coded modulation (BICM) based multiple relay cooperative network. The relays are fixed and operating in a amplify-and-forward (AF) mode. The asymptotic bit error rate (BER) bounds of the cooperative system with the serial concatenated BICM using the M-ary Phase Shift Keying (M-PSK) modulation scheme over Additive White Gaussian Noise (AWGN) channels and Rayleigh fading channels are obtained. For the numerical results of union bound on BER, moment generating function (MGF) based approach is used. Maximal ratio combining (MRC) is used at the destination to obtain the advantage of spatial diversity. The analytical results are verified by comparing the results with those obtained from simulations.

关键词： Bit error rate Relays AWGN Fading Diversity reception Performance analysis Interleaved codes modulation coding Cooperative systems Concatenated codes

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SDR technology for high capacity and interoperable BMS systems

SDR technology for high capacity and interoperable BMS syste...

引用

European Conference on Wireless Technology

作者： Annamaria Raviola Luca Piccollo Marketing and Business Development Department Electrical Communications Genoa Italy

Software-Defined Radio (SDR) is an innovative paradigm to manage wireless communications, where the main radio parameters (RF bandwidth, modulation scheme, channel coding, etc) are completely defined in software and can be redefined by new software load. In a SW Defined Radio (SDR) each communication will be performed by executing on the same platform the relevant SW application (waveform), not depending on the HW implementation. This allows a single SDR system to support several communications that are provided today by different dedicated systems. SDR technology is comprised of both software and hardware. The Main components of the SDR software are the waveform applications. A waveform application is the implementation of a communications specification/standard (e.g. SINCGARS VHF, SATURN). A waveform specification includes all the characteristics of that waveform that describe its RF emission and technical interoperability parameters.

关键词： Application software Radio frequency Innovation management Radio spectrum management Wireless communication Bandwidth modulation coding Channel coding Hardware Communication standards

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Coded modulation Scheme with CPPC Codes for FM IBOC Broadcasting

Coded Modulation Scheme with CPPC Codes for FM IBOC Broadcas...

引用

International Conference on Management and Service Science, MASS

作者： Yunfei Feng Jianping Li Yue Dong Shi Sha School of Information Engineering Communication University of China Beijing China Telecommunication System Management Murray State University KY US

Hybrid in-band on-channel (IBOC) broadcasting system is a method of digital audio radio, which could transmit analog FM and digital audio simultaneously. Due to the existence of fading and interference in FM bands, however, the signal receiving for the hybrid IBOC system is very challenging. In this work, a type of coded modulation scheme was proposed in hybrid in-band on-channel system, which combines complementary punctured-pair convolutional (CPPC) codes and BICM with iterative decoding (BICM-ID). The CPPC codes can largely resist the first adjacent-channel interference, the noise and fading. TCM, a bandwidth-efficient approach, primarily is considered for Gaussian channels. While a new scheme of BICM can be used to provide excellent performance over both Gaussian and fading channels with iterative decoding (ID). By using BICM-ID, an FM IBOC broadcasting system can yield a better coding gain over complex Rayleigh fading channels without bandwidth expansion. Through the analysis and simulation, results show that the proposed scheme can effectively improve the receiving performance of an FM IBOC system.

关键词： modulation coding Fading Digital audio broadcasting Radio broadcasting Interference Iterative decoding Convolutional codes Convolution Resists Rayleigh channels

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