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检索条件"主题词=Modulation coding"

共 7024 条记录，以下是281-290 订阅

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A Novel Spatial modulation Technique with Interference Free Simultaneous Transmission

A Novel Spatial Modulation Technique with Interference Free ...

引用

21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： ElKalagy, A. AlSusa, E. Univ Manchester Sch Elect & Elect Engn MACS Grp Manchester M60 1QD Lancs England

ISBN: (纸本)9781424480166

A performance-enhanced two-transmit antenna spatial modulation (SM) technique is introduced and analysed. Specifically, this paper modifies the conventional spatial modulation technique by utilising simultaneous transmission from two antennas, couple with the utilisation of short orthogonal codes for antenna identification. A unique symbol to antenna assignment to enable the receiver to distinguish between the different possible constellation points is also presented. To highlight the achieved gains, the paper compares the performances of the proposed technique to those of the conventional SM technique in OFDM systems. The results show that the proposed technique outperforms the conventional one in terms of BER performance. Furthermore we develop analytical analysis for the symbol error ratio (SER) of the proposed technique and show that the analytical and simulation results closely match.

关键词： BER performance antenna identification error statistics interference free simultaneous transmission modulation coding orthogonal codes orthogonal codes symbol error ratio transmitting antennas two-transmit antenna spatial modulation technique

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CONSTANT MODULUS ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING

CONSTANT MODULUS ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING

引用

MILCOM Military Communications Conference

作者： Koese, Cenk Chugg, Keith M. Halford, Thomas R. TrellisWare Technol Inc San Diego CA 92127 USA

ISBN: (纸本)9781424481804

Orthogonal frequency domain multiplexing (OFDM) is the signal format of choice for spectrally efficient communications over time-invariant, frequency-selective channels. OFDM has a large peak-to-average power ratio, however, which makes it incompatible with transmitter non-linearities (e.g., saturated power amplifiers (PAs)). Conversely, single-carrier constant envelope modulations can be used with a saturated PA, but exhibit limited spectral efficiency and requiring more complex receiver processing (i.e., channel equalization). This paper presents a method of modulation coding that results in an OFDM signal with constant modulus (CM-OFDM). A method of decoding this modulation code is developed and the resulting CM-OFDM system performance is compared to that of OFDM via simulation. The results suggest that CM-OFDM may provide a waveform uniquely qualified for some operational scenarios.

关键词： OFDM modulation channel equalization constant modulus orthogonal frequency division multiplexing frequency-selective channels modulation coding modulation coding peak-to-average power ratio single-carrier constant envelope modulations spectral efficiency

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On the Efficiency of Persistent Scheduling for Non-periodic Real-time Services in IEEE 802.16e System

On the Efficiency of Persistent Scheduling for Non-periodic ...

引用

21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Jin, Hu Lee, Ju Young Sung, Dan Keun Korea Adv Inst Sci & Technol Dept EE Taejon 305701 South Korea SK Broandband Seoul South Korea

ISBN: (纸本)9781424480166

In order to reduce MAP overhead for periodic small-sized services such as voice over IP (VoIP) service, a persistent scheduling scheme has been proposed in IEEE 802.16e/m. Although this persistent scheduling scheme is designed for periodic services, we propose to adopt the persistent scheduling for non-periodic real-time services with small-sized packets by considering the advantage of MAP overhead reduction. Assuming Poisson packet arrivals which show a typical non-periodic property, we mathematically analyze the average delay performance and derive the optimal resource allocation period of the persistent scheduling with a given delay requirement. In this paper, we also compare the average occupied resources per frame between the persistent scheduling and the conventional scheduling both in downlink and uplink. Analysis and numerical results show that for the non-periodic services, the persistent scheduling shows more efficient resource usage than that of the conventional scheduling with a smaller packet size and higher modulation and coding scheme.

关键词： IEEE 802.16e system MAP overhead reduction Poisson packet arrivals WiMax average delay performance modulation coding modulation-coding scheme nonperiodic real-time services optimal resource allocation persistent scheduling scheme resource allocation scheduling stochastic processes voice over IP services

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A Low-Complexity Semi-Analytical Approximation to the Block Error Rate in Nakagami-m Block Fading Channels

A Low-Complexity Semi-Analytical Approximation to the Block ...

引用

IEEE 72nd Vehicular Technology Conference Fall 2010

作者： Toyserkani, Arash T. Lakshmana, Tilak Rajesh Strom, Erik G. Svensson, Arne Chalmers Commun Syst Grp Dept Signals & Syst SE-41296 Gothenburg Sweden

ISBN: (纸本)9781424435746

There are few analytical formulas that can be used for calculating the block error rate (BLER) in block fading channels. Thus, an estimate of the BLER is often obtained using numerical methods. One such method is the threshold method which assigns 0 or 1 to the instantaneous BLER given the signal to noise ratio (SNR) level. It has been shown that utilizing such a method results in an accurate approximation of the BLER in Nakagami-m block fading channels for a wide range of m. In this work, we consider a recently proposed simple method of obtaining the threshold and study the effect of adopting different physical layer and channel parameters on that threshold. We show that, while the value of this threshold depends on the modulation, coding, and block size, it is almost unaffected by the m parameter of Nakagami-m channels for a wide range of practical values. In addition, for a given modulation and coding method, the threshold is shown to be a simple function of block size. As a result, the computational complexity required to obtain the threshold can be significantly reduced.

关键词： block error probability modulation coding THRESHOLDING METHOD Fading channels signal to noise ratios simple function wide-range

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A Protocol for Adaptive Multicast Transmission in Packet Radio Networks

A Protocol for Adaptive Multicast Transmission in Packet Rad...

引用

MILCOM Military Communications Conference

作者： Boyd, Steven W. Ellis, Jason D. Pursley, Michael B.

ISBN: (纸本)9781424481804

Adaptation is required for efficient transmission in a wireless communications network because of the fluctuations in propagation conditions that occur on the links. In a half-duplex packet radio network, the use of unicast transmission typically permits the receiving radio to send packet-by-packet acknowledgments and include a small amount of feedback information in each acknowledgment. For multicast transmission in such a network, it is usually not feasible for all receiving radios to send packet-by-packet acknowledgments, so a receiving radio has fewer opportunities to provide feedback. We present a low-complexity adaptive multicast transmission protocol that compensates for time-varying propagation losses in a packet radio network by adjusting the modulation and coding. Simple receiver statistics furnish the necessary control information for the adaptive protocol;no channel estimation, training, or pilot symbols are needed. The protocol's throughput performance is evaluated for dynamic channels and compared with the throughput of hypothetical ideal protocols that are given perfect channel-state information. We demonstrate that our protocol performs nearly as well as the ideal protocols.

关键词： channel estimation channel-state information half-duplex packet radio network hypothetical ideal protocols low-complexity adaptive multicast transmission protocol modulation coding multicast protocols packet radio networks packet-by-packet acknowledgments

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Unified Theoretical Expressions for the Average Error Rate of Selection Diversity with Arbitrary Coded and Uncoded modulation in Slow Rayleigh Fading and Their Application to Analytical, Semi-Analytical and Simulation Performance Evaluation

Unified Theoretical Expressions for the Average Error Rate o...

引用

IEEE Global Telecommunications Conference (GLOBECOM 2010)

作者： Beaulieu, Norman C. Univ Alberta Dept Elect & Comp Engn Edmonton AB T6G 2V4 Canada

ISBN: (纸本)9781424456383

A unified theory for selection combining diversity in Rayleigh fading channels is derived. It is shown that the performance of arbitrary systems used with selection combining diversity can be expressed in terms of only the performance of the system on a single branch Rayleigh fading channel. The results are valid for coded and uncoded transmission as well as for balanced (equal power) diversity branches and unbalanced (unequal power) diversity branches. The unified theory encompasses both general noise and general interference.

关键词： Rayleigh channels Rayleigh fading channels arbitrary coded modulation average error rate diversity reception general interference general noise interference (signal) modulation coding selection combining diversity uncoded modulation

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Rank modulation with Multiplicity

Rank Modulation with Multiplicity

引用

Globecom Workshops

作者： Jiang, Anxiao (Andrew) Wang, Yue Texas A&M Univ Comp Sci & Eng Dept College Stn TX 77843 USA

ISBN: (纸本)9781424488650

Rank modulation is a scheme that uses the relative order of cell levels to represent data. Its applications include flash memories, phase-change memories, etc. An extension of rank modulation is studied in this paper, where multiple cells can have the same rank. We focus on the rewriting of data based on this new scheme, and study its basic properties.

关键词： data rewriting error correction codes flash memories modulation coding multiple cell multiplicity phase change memories rank modulation rewriting systems

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Soft Decision Viterbi Decoder for FSK Demodulation Under Fast Fading Channel

Soft Decision Viterbi Decoder for FSK Demodulation Under Fas...

引用

3rd International Conference on Communications and Electronics

作者： Nojima, Daisuke Nagao, Yuhei Kurosaki, Masayuki Ochi, Hiroshi Ishikawa, Akira Fukagawa, Shugo Tahira, Akihiro Kyushu Inst Technol Fac Comp Sci & Syst Eng 680-4 Kawazu Iizuka Fukuoka 8208502 Japan R&D Div Nagasaki 8570115 Japan

ISBN: (纸本)9781424470587

In a soft decision Viterbi decoder, the log-likelihood ratio (LLR) metric is used to improve the performance of the error correction. However, this cannot be directly applied in frequency shift keying (FSK) wireless transmission system which uses a frequency discriminator for FSK de-modulation - an inherently non-linear circuit. The LLR for a linear system cannot be used for the FSK wireless transmission system. It is necessary to calculate LLR which considers the non-linear characteristic of the frequency discriminator. In this paper, we derive the modified LLR which considers the non-linear characteristic of the frequency discriminator. Simulation shows the effectiveness of the derived LLR for 4-ary FSK wireless transmission system.

关键词： 4-ary FSK wireless transmission system FSK demodulation Viterbi decoding channel coding demodulation error correction error correction fading channels fast fading channel frequency discriminator frequency shift keying log-likelihood ratio modulation coding soft decision Viterbi decoder

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Adaptive modulation and coding for IEEE 802.11n

Adaptive Modulation and Coding for IEEE 802.11n

引用

IEEE Conference on Wireless Communications and Networking

作者： Fei Peng Jinyun Zhang William E. Ryan University of Arizona Tucson USA Mitsubishi Electric Research Laboratories Inc. USA

We propose a link adaptation technique for IEEE 802.11n MIMO-OFDM systems with convolutional coding. The technique dynamically selects the best modulation and coding scheme (MCS) based on channel conditions and on the medium access control (MAC) layer performance (coded BER or PER) requested by applications. We show that the coded performance at decoder output can be modeled as a function of decoder-input uncoded BER and the code rate. For MIMO-OFDM systems with different modulation types for different spatial streams at each subcarrier, we propose a simple and accurate method for computing the BER for each spatial stream mixed from different subcarriers. We also discuss approaches for searching and selecting the MCS.

关键词： modulation coding Bit error rate Decoding MIMO Media Access Protocol OFDM modulation Convolutional codes Fading Array signal processing Analytical models

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A New Cross Layer Design of Adaptive modulation and coding in Finite Buffer Wireless Links

A New Cross Layer Design of Adaptive Modulation and Coding i...

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International Conference on Future Generation Communication and Networking (FGCN)

作者： Abouzar Ghavami Farid Ashtiani Advanced Communications Research Institute (ACRI) Department of Electrical Engineering Sharif University of Technology Tehran Iran

ISBN: (纸本)9780769530482;0769530486

In this paper, a cross-layer approach introducing new design parameters is developed for multi-rate wireless links. The novel design jointly exploits the finite-length queuing at the data link layer and the adaptation capability of the adaptive modulation and coding (AMC) scheme at the physical layer to optimize system performance for a wireless link. The analytical framework is based on discrete time Markov chain. The performance metrics such as packet drop probability, channel packet error rate and packet loss rate are derived. Using these metrics, a constrained optimization problem is solved numerically to maximize the overall system throughput.

关键词： Cross layer design modulation coding Transmitters Physical layer Throughput Measurement Error analysis Delay effects Design optimization System performance

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