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检索条件"主题词=Modulation coding"

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A simplified approach to coding, modulation, and detection design for generalized MSK with two symbol period pulse duration

A simplified approach to coding, modulation, and detection d...

引用

Biennial Symposium on Communications, QBSC

作者： Walid Abediseid Peter Galko Department of Electrical & Computer Engineering University of Waterloo of Canada Canada School of Information Technology & Engineering University of Ottawa Canada

Double repetition code exhibits unique properties when combined with precoded generalized minimum-shift keying signals of up to two symbol period pulse duration. It is shown that using two stages of channel encoding, the last being a double repetition code, the code design for such modulation scheme simplifies. Also, it is shown that the nonlinear continuous-phase frequency-shift keying modulator can be replaced by a simple linear I-Q modulator to generate the same coded signals. The detection problem for the recovery of the symbols sequence from the decision variables is shown to be one corresponding to memoryless modulation, avoiding the use of the maximum likelihood sequence detection.

关键词： Pulse modulation modulation coding Maximum likelihood detection Maximum likelihood estimation Frequency shift keying Chirp modulation Signal generators Phase modulation Amplitude modulation Noise shaping

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coding, processing gain, and modulation in frequency-hopped multiple access communications: tradeoff considerations

Coding, processing gain, and modulation in frequency-hopped ...

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IEEE International Symposium on Information Theory

作者： Sang Wu Kim Department of Electrical Engineering Korea Advanced Institute of Science and Technology Taejeon South Korea

We consider a situation where K transmitter-receiver pairs communicate simultaneously over a channel of bandwidth B. Each transmitter sends one of the M possible signals in every 2 seconds over one of the p possible frequency slots, having a bandwidth of B/q. We assume the use of M-ary FSK orthogonal signaling with noncoherent detection. Each transmitter-receiver pair has a unique hopping pattern that selects the frequency slot. We model the hopping patterns as independent, identically distributed (i.i.d.) random sequences uniformly distributed over a set of q frequencies. We assume that each packet consists of a Reed-Solomon (RS) codeword, and one code symbol (M-ary) is transmitted per hop.< >

关键词： Frequency modulation modulation coding Bandwidth Frequency shift keying Throughput Error probability Demodulation Bit rate Transmitters Random sequences

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Adaptive coding for pilot symbol assisted modulation without feedback

Adaptive coding for pilot symbol assisted modulation without...

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Asilomar Conference on Signals, Systems & Computers

作者： M. Medard I. Abou-Faycal U. Madhow Laboratory for Information and Decision Systems Massachusetts Institute of Technology USA Electrical and Computer Engineering Department University of California Santa Barbara USA

We show that pilot symbol assisted modulation (PSAM) schemes can be improved by adapting the coded modulation strategy at the sender to the quality of the channel measurement at the receiver, without requiring any channel feedback from the receiver. The transmitter employs interleaved codes, with data symbols coded according to their distance from the nearest pilot symbols. The performance benefits from this approach are quantified in the context of binary signaling over time-varying Rayleigh fading channels described by a Gauss-Markov model. The spacing of the pilot symbols is optimized to maximize the mutual information between input and output in the preceding setting. Causal and non-causal channel estimators of varying complexity and delay are considered. It is shown that, by appropriate optimization for the spacing between consecutive pilot symbols, the adaptive coding techniques proposed can yield up to 30% improvement in achievable rate, without any feedback from the receiver to the sender.

关键词： Adaptive coding modulation coding Feedback Delay estimation Transmitters Interleaved codes Fading Gaussian channels Context modeling Mutual information

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Adaptive coding and modulation for hybrid FSO/RF systems

Adaptive coding and modulation for hybrid FSO/RF systems

引用

Asilomar Conference on Signals, Systems & Computers

作者： Y. Tang M. Brandt-Pearce S. G. Wilson Charles L. Brown Department of Electrical and Computer Engineering University of Virginia Charlottesville VA USA

ISBN: (纸本)9781424458257

Hybrid free space optical (FSO)/RF communication systems can provide high throughput short range ¿lastmile¿ connectivity. Since channel conditions are highly variable, adaptive symbol rate and modulation schemes are attractive for this application to make better use of available resources. This paper focuses on the information-theoretic analysis of such FSO/RF systems and introduces an adaptive communication scheme resulting in a capacity-approaching and seamless joint system. Numerical and simulation results give insight into the relation between adaptive parameters and system performance, and provide guidance for the design of a practical hybrid system.

关键词： Adaptive coding modulation coding Radio frequency Optical modulation Throughput Information analysis Numerical simulation Adaptive systems System performance Adaptive control

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On construction of bandwidth efficient, low complexity, and high coding gain 8-PSK modulation codes

On construction of bandwidth efficient, low complexity, and ...

引用

[Conference Record] GLOBECOM '92 - Communications for Global Users: IEEE

作者： S. Lin S. Rajpal D.J. Rhee Department of Electrical Engineering University of Hawaii Manoa Honolulu HI USA

Nested concatenated coded 8-PSK (phase-shift keying) modulation schemes are proposed to achieve good error performance, large coding gains, and high spectral efficiency with reduced decoding complexity. In the concatenation, Reed-Solomon (RS) codes, including the NASA standard (255,223) RS code, are used as the outer codes and multidimensional trellis 8-PSK codes are used as the inner codes. The inner codes are constructed from convolutional codes with good free branch distances and multidimensional 8-PSK coset codes through concatenation. Analytical and simulation results show that these schemes perform extremely well and achieve impressive coding gains over uncoded reference systems for bit error rates below 10/sup -3/. These schemes achieve large coding gains with reduced decoding complexity.< >

关键词： Bandwidth Performance gain Decoding Multidimensional systems Concatenated codes Phase shift keying Phase modulation modulation coding Reed-Solomon codes NASA

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Link Analysis of Commercial and Wideband Gapfiller Satellite (WGS) Satellites Using DVB-S2 with Variable coding and modulation (VCM)

Link Analysis of Commercial and Wideband Gapfiller Satellite...

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MILCOM, Military Communications Conference

作者： Bruce Bennett Daniel Hannan Jim Marshall Richard Gibbons DISA USA SMDC/ARSTRAT USA MITRE Corporation USA

A link analysis was performed of the digital video broadcast-satellite (DVB-S) second generation waveform (DVB-S2) using a commercial (Ku band) and the wideband gapfiller satellite (WGS) satellite at X-band and Ka-band. The analysis is for the CENTCOM VSAT network (also known as the global war on terrorism [GWOT] network) that uses the EUTELSAT W6 satellite (21.5deg east) and supports both forward (DVB-S) and return traffic [DVB-return channel by satellite (RCS)] traffic in the same 72 MHz transponder. The forward traffic consists of nominal DVB-S broadcasts to receive-only terminals (1 m) as well as duplex 1.8 m and 2.4 m terminals. The return traffic consists of constant-rate, tactical, video feeds (from the 2.4m terminals) along with SIPRNET Internet protocol (IP) interactive traffic (from the 1.8 m terminals). The hub is located at Landstuhl, Germany. The paper considers 3 cases. First, the capacity of the Eutelsat W6 transponder is computed for the forward and return traffic sharing the same transponder. Next, the capacity is computed for DVB-S2 using constant coding and modulation (CCM) and variable coding and modulation (VCM) over the baseline GWOT network. Finally, the system capacity is computed using WGS (at 60deg east) again using DVB-S2 with CCM and VCM and DVB-RCS

关键词： Wideband Digital video broadcasting modulation coding Satellite broadcasting Telecommunication traffic Transponders Performance analysis Terrorism Video sharing Feeds

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Embedded turbo coding in pattern position modulation for ultra wideband radio systems

Embedded turbo coding in pattern position modulation for ult...

引用

IEEE International Symposium on Information Theory

作者： Chunyu Bi J.Y. Hui L. Bodenheimer H. Spielberg Detecon Inc. San Mateo CA USA Department of Electrical Engineering Arizona State University Tempe AZ USA

ISBN: (纸本)0780382803

In this paper, a novel method is proposed to do turbo coding for pulse (pattern) position modulation, for ultra wideband radio system. Such systems maps multiple PPM slot detections into the probabilities of those bits to be "1", then turbo decoding can be done. The noise model in this coding scheme and the discrete interference model to replace the AWGN model to improve the coding performance are discussed.

关键词： Turbo codes modulation coding Ultra wideband technology Bit error rate Throughput Receivers Radio transmitters Background noise Decoding Convolutional codes

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Combined source coding and modulation for fading channels

Combined source coding and modulation for fading channels

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IEEE Conference on Vehicular Technology (VTC)

作者： G.E. Atkin B. Patel J. Rahhal Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA

The authors report on a combined source encoding and modulation technique based on permutation codes (PCs). This combined system directly maps the source codewords into modulation symbols. This system offers improvement in terms of better overall fidelity, reduced encoding delay, and robustness. Nearly optimal codes for Gaussian and Laplacian sources are obtained for fading channels. The performance of these codes and the combined system is evaluated and compared with other systems.

关键词： Source coding modulation coding Fading Personal communication networks Distortion measurement Delay Encoding Robustness Laplace equations Bit rate

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DVB-S2 Adaptive coding and modulation for HAP Communication System

DVB-S2 Adaptive Coding and Modulation for HAP Communication ...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Miha Smolnikar Tomaz Javornik Mihael Mohorcic Matteo Berioli Department of Communication Systems Jozef Stefan Institute Ljubljana Slovenia Institute of Communications and Navigation German Aerospace Center Oberpfaffenhofen Germany

Combining some of the best terrestrial and satellite systems' characteristics, high altitude platforms (HAPs) have recently emerged as an alternative solution for the provision of broadband services. Characterised by challenging propagation conditions in the allocated frequency bands, they require efficient utilisation of radio interface in order to make best use of the available spectrum. This paper analyses possible utilisation of DVB-S2 standard on HAPs, focusing on the performance of its adaptive coding and modulation (ACM) procedures as a mean of maximizing the link reliability and throughput. Two distinct operating scenarios are addressed, one assuming static channel conditions with the applied rain fading and the other representing mobile channel conditions along a representative railway track We show that by considering only a subset of transmission modes (MODCODs) defined by the DVB-S2 standard, the system could be optimized in terms of achievable spectral efficiency as well as in terms of implementation complexity. A procedure for optimal MODCOD subset selection is proposed, taking into account the predefined switching thresholds and round-trip time delay.

关键词： Digital video broadcasting Adaptive coding modulation coding Satellite broadcasting Radio spectrum management Performance analysis Throughput Rain fading Rail transportation Delay effects

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Combined frequency/phase modulation with multiple trellis coding

Combined frequency/phase modulation with multiple trellis co...

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IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： S.S. Periyalwar S. Fleisher Department of Electrical Engineering Technical University of Nova Scotia Halifax NS Canada

The concept of multiple trellis-coded modulation (MTCM) is extended to frequency- and phase-modulated (FPM) signal sets. A significant improvement is observed in the performance for AWGN and fading channels when compared to MTCM of MPSK signal sets. For values of the fading parameter used, the performance on the fading channel is guided by the length and distance of the shortest error event path.< >

关键词： Frequency Phase modulation Fading AWGN channels modulation coding Convolutional codes Interleaved codes Diversity methods Design optimization Signal design

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