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检索条件"主题词=Modulation Coding"

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Adaptive OFDM modulation techniques over fading channel for wireless communication systems with an 80 MHz bandwidth

Adaptive OFDM modulation techniques over fading channel for ...

引用

IEEE International Nanoelectronics Conference (INEC)

作者： Donekeo Lakanchanh Suthichai Noppanakeepong Shingo Yoshizawa Yoshikazu Miyanaga Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand Graduate School of Information Science and Technology Hokkaido University Sapporo Japan

The orthogonal frequency division multiplexing (OFDM) is one of the promising technologies to improve the spectral efficiency, enhance system capacity and mitigate inter-symbol interference in the wireless communication system. In this paper, we aim at the study on adaptive modulation and coding technologies for wireless system over frequency selective fading channel. This adaptive allocation algorithm assigns the sub-carriers. We are applied adaptive modulation technique to each sub-carrier to keep required BER and PER performance. The system chooses modulation among BPSK, QPSK, 16QAM and 64QAM which the estimated SNR of the sub-carrier inhabits. Adaptive modulation can improve communication performance under small SNR. The computer simulation result shows the BER, PER and Throughput performance can be improved under 30 dB of SNR region.

关键词： OFDM modulation Fading Wireless communication Bandwidth Bit error rate Interference modulation coding Binary phase shift keying Quadrature phase shift keying Computer simulation

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MIMO radar sparse angle-Doppler imaging for ground moving target indication

MIMO radar sparse angle-Doppler imaging for ground moving ta...

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IEEE National Conference on Radar

作者： Ming Xue William Roberts Jian Li Xing Tan Petre Stoica Department of Electrical and Computer Engineering University of Florida Gainesville FL USA Department of Information Technology University of Uppsala Sweden

ISBN: (纸本)9781424458110;9781424458127

We present in this paper a regularized sparse signal recovery algorithm, referred to as sparse learning via iterative minimization (SLIM), to provide ground moving target indication (GMTI) through multiple-input multiple-output (MIMO) radar angle-Doppler imaging. A slow-time modulation scheme with code division multiplexing is employed to achieve transmit diversity. In this way, we avoid the high correlation properties of orthogonal waveforms and the Doppler ambiguity that is encountered with Doppler division multiplexing schemes. After removing jammer and clutter effects using semi-unitary projections, we show that SLIM, using primary data only, is able to form sparse angle-Doppler images and to provide for accurate target localization.

关键词： MIMO Radar imaging Iterative algorithms Minimization methods Doppler radar modulation coding Code division multiplexing OFDM Jamming Clutter

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coding for MPPM-like systems

Coding for MPPM-like systems

引用

Biennial Symposium on Communications, QBSC

作者： Siyu Liu Frank R. Kschischang Department of Electrical and Computer Engineering University of Toronto Toronto ONT Canada

ISBN: (纸本)9781424457090;9781424457113

Multipulse pulse position modulation (MPPM) has been widely proposed to improve data rate over the traditional pulse position modulation (PPM) in free-space optical communication systems. However, there is no known efficient method of encoding MPPM codewords. Furthermore, MPPM is not the optimal coding scheme (in terms of data rate) given the two main constraints of optical systems (duty cycle and zero runlength). In this paper, a new coding technique based on constrained coding is introduced that allows construction of codes which achieve considerable rate gain over comparable MPPM systems. In addition, our new codes allow for convenient concatenation with an outer code and are suitable for iterative decoding. Simulation results show that these codes can achieve a 6 dB coding gain over comparable MPPM systems.

关键词： Pulse modulation Optical pulses Optical modulation modulation coding Optical fiber communication Iterative decoding Encoding Gain Bandwidth Throughput

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Analysis and Evaluation of Novel Asterisk-16QAM Constellation Family and Its Application for PMEPR Control in Golay-Coded OFDM Systems

Analysis and Evaluation of Novel Asterisk-16QAM Constellatio...

引用

IEEE International Conference on Communications (ICC)

作者： X. Liu H.-C. Wu Department of Systems Engineering University of Arkansas Little Rock Little Rock AR USA Department of Electrical and Computer Engineering Louisiana State University Baton Rouge LA USA

coding techniques for reducing peak-to-mean-envelope-power-ratio (PMEPR) have been intensively investigated for the orthogonal frequency division multiplexing (OFDM) systems adopting PSK, square QAM, and rectangular QAM constellations since the PMEPR is the crucial problem in OFDM. Recently, we designed a new coding method for reducing the PMEPR in OFDM built on star 16QAM constellations. In this paper, we present a generalized paradigm for the novel asterisk 16QAM constellations and facilitate the new PMEPR controlling technique for OFDM systems. In this new framework of the asterisk 16QAM (A16QAM) coded OFDM systems, we establish the theoretical development and show that the maximum PMEPR is bounded by 4.0 and 2.0, if the information symbols are coded using Golay sequences and Golay complementary pairs, respectively.

关键词： Control systems Quadrature amplitude modulation OFDM modulation Upper bound Phase shift keying Communication systems Constellation diagram Phase modulation modulation coding Communications Society

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30 Gb/s direct modulation of holey VCSELs with thermoelectric cooling

30 Gb/s direct modulation of holey VCSELs with thermoelectri...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Zhaobing Tian Chen Chen Kent D. Choquette David V. Plant Department of Electrical and Computer Engineering McGill University Montreal QUE Canada Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign IL USA

We demonstrate a 25 Gb/s error-free operation of a directly modulated holey VCSEL, and the data rate can be extended to above 30 Gb/s when the VCSEL substrate temperature is stabilized by a thermoelectric cooler.

ISBN: (纸本)9781557528896

关键词： Vertical cavity surface emitting lasers Thermoelectricity Cooling Temperature High speed optical techniques Optical modulation modulation coding Substrates Optical feedback Optical sensors

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Performance of low-density parity-check coded modulation

Performance of low-density parity-check coded modulation

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IEEE Conference on Aerospace

作者： Jon Hamkins Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA

This paper reports the performance of a family of nine accumulate-repeat-4-jagged-accumulate (AR4JA) low-density parity-check (LDPC) codes [4] when used in conjunction with binary phase-shift-keying (BPSK), quadrature PSK (QPSK), 8-PSK, 16-ary amplitude PSK (16-APSK), and 32-APSK. We also report the performance under various mappings of bits to modulation symbols, hard decision decoding, log-likelihood ratio (LLR) approximations, and decoder iterations. One of the simple and well-performing LLR approximations can be expressed in a general equation that applies to all of the modulation types.

关键词： Parity check codes modulation coding Phase shift keying Binary phase shift keying Phase modulation Amplitude modulation Quadrature phase shift keying Iterative decoding Equations Space missions

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Efficient Channel Quality Feedback Signaling Using Transform coding and Bit Allocation

Efficient Channel Quality Feedback Signaling Using Transform...

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IEEE Conference on Vehicular Technology (VTC)

作者： Behrooz Makki Thomas Eriksson Department of Signals and Systems Chalmers University of Technology Gothenburg Sweden

Recently, substantial attention has been paid to compress the channel quality information feedback while preserving most of its relevant information, as required for Adaptive modulation and coding (AMC). This paper compares the performance of some lossy feedback compression methods and, particularly, investigate the effect of bit allocation on their performance. Simulation results show that the Discrete Cosine Transform (DCT) approach, along with our proposed bit allocation method, leads to the best feedback compression performance.

关键词： Feedback Transform coding Bit rate Discrete cosine transforms Scheduling modulation coding Performance loss Fading Signal generators Frequency

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Noncoherent physical-layer network coding using binary CPFSK modulation

Noncoherent physical-layer network coding using binary CPFSK...

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MILCOM, Military Communications Conference

作者： Matthew C. Valenti Don Torrieri Terry Ferrett West Virginia University Morgantown WV USA U.S. Army Research Laboratory Adelphi MD USA

ISBN: (纸本)9781424452385

Physical-layer network coding is a high-throughput technique for communicating over the two-way relay channel, which consists of two terminals that communicate exclusively via an intermediate relay. An exchange of messages begins with both terminals transmitting binary data sequences simultaneously to the relay. The relay determines the modulo-2 sum of the sequences, which it modulates and broadcasts to the terminals. Since each terminal knows the information it transmitted, it can determine the information transmitted by the other terminal by subtracting its own information from the broadcast signal. Prior work on the topic of physical-layer network coding has assumed that the signals transmitted by the two terminals arrive at the relay with perfectly aligned phases, permitting coherent reception. In this paper, we relax the assumption of aligned phases and consider noncoherent reception of binary continuous-phase frequency-shift keying signals. A derivation of the relay receiver is given for varying amounts of channel state information, and results are provided showing the error performance of the proposed system without an outer error-correcting code and with an outer turbo code.

关键词： Network coding modulation coding Relays Broadcasting Time division multiple access Throughput Decoding Demodulation Laboratories Frequency shift keying

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Pulse position modulation for FSO systems: Capacity and channel coding

Pulse position modulation for FSO systems: Capacity and chan...

引用

International Conference on Telecommunications (ConTEL)

作者： F. Xu M.A. Khalighi S. Bourennane Institut Fresnel UMR CNRS 6133 École Centrale Marseille Marseilles France

For terrestrial free space optical (FSO) systems, we investigate the use of pulse position modulation (PPM) which has the interesting property of being average-energy efficient. We first discuss the upper bound on the information transmission rate for a Gaussian channel. Next, we consider the more practical aspect of channel coding and look for a suitable solution for the case of Q-ary PPM. Instead of using a non-binary channel code, we suggest to use a simple binary convolutional code and to perform iterative soft demodulation (demapping) and channel decoding at the receiver. We show that the proposed scheme is quite efficient against demodulation errors due to the receiver noise. Moreover, we propose a simple soft-demapping method of low complexity for the general case of Q-ary PPM. The receiver complexity remains then reasonable in view of implementation in a terrestrial FSO system.

关键词： Pulse modulation modulation coding Channel capacity Channel coding Optical pulses Demodulation Optical modulation Optical receivers Upper bound Gaussian channels

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Progressive Source Transmissions Using Joint Source-Channel coding and Hierarchical modulation in Packetized Networks

Progressive Source Transmissions Using Joint Source-Channel ...

引用

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Suayb S. Arslan Pamela C. Cosman Laurence B. Milstein Department of Electrical and Computer Engineering University of California San Diego La Jolla CA USA

With Unequal Error Protection (UEP), more important symbols are given greater protection against channel errors than are less important symbols. The protection can be accomplished by various methods, including joint source-channel coding (JSCC) and hierarchical modulation. In this paper, a robust progressive source transmission system using forward error correction (FEC) and a bits-to-symbol assignment methodology that provides UEP is proposed. UEP is not only provided by hierarchical modulation but also by the packetization methodology combined with channel coding. It is demonstrated by simulation that our system improves performance compared to an Equal Error Protection (EEP) technique and to a baseline JSCC-only mechanism.

关键词： modulation coding Error correction codes Channel coding Computer errors Robustness Forward error correction Binary phase shift keying Image coding Streaming media Image reconstruction

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