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检索条件"主题词=Modulation coding"

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Multi-Rate Continuous Phase modulations for Gaussian Broadcast Channels

Multi-Rate Continuous Phase Modulations for Gaussian Broadca...

引用

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Dario Fertonani Tolga M. Duman Department of Electrical Engineering Arizona State University Tempe AZ USA

We consider unequal error-protection schemes obtained by two-level superposition coding. While the existing schemes implement superposition by means of linear modulations, we propose superposition implemented through continuous phase modulations (CPMs). In the considered scheme, unlike in the linearly-modulated ones, the transmitted signal has constant envelope and thus the system does not rely on the presence of expensive amplifiers. We investigate the potential of CPMs for multi-rate transmissions over channels impaired by additive white Gaussian noise. Particularly, we derive the relevant algorithm for maximum-a-posteriori symbol detection, evaluate the ultimate information rate, and design practical coding schemes that perform fairly close to the theoretical limits.

关键词： Continuous phase modulation Broadcasting Information rates modulation coding Iterative decoding Amplitude shift keying Additive white noise AWGN Algorithm design and analysis Performance evaluation

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Code/pulse position swapping (C/PPS) for multiple-bits/symbol and reconfigurable multiple access communications

Code/pulse position swapping (C/PPS) for multiple-bits/symbo...

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LEOS Summer Topical Meetings

作者： Antonio J. Mendez Vincent J. Hernandez Robert M. Gagliardi Corey V. Bennett Mendez Research and Development Associates El Segundo CA USA Lawrence Livemore National Laboratory Livermore CA USA University of Southern California Los Angeles CA USA

An architecture for code/pulse position swapping (C/PPS) is described, whereby code modulation replaces traditional pulse position modulation (PPM). The architecture supports M-ary signaling, multiple accessing, throu... 详细信息

关键词： Quality of service Pulse modulation modulation coding Throughput Optical pulses Intensity modulation Research and development Laboratories Optical modulation Multiaccess communication

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Advanced receiver and MIMO schemes for LTE communications system

Advanced receiver and MIMO schemes for LTE communications sy...

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International Conference on Wireless Communication, Vehicular Technology, Information Theory and Aerospace and Electronic Systems Technology (Wireless VITAE)

作者： Simone Morosi Enrico Del Re Luca Vettori Department of Electronics and Telecommunications University of Florence Italy

ISBN: (纸本)9781424440665

Within the 3rd generation partnership project (3 Gpp) the LTE standard is currently being defined aiming at providing rates up to 300 Mb/s in downlink. In this paper, main alternative strategies which have been proposed for the downlink air interface are compared by taking into account different modulation formats and transmit diversity schemes. Moreover, we also consider the modulation and coding techniques which have been previously used in the WiMax system.

关键词： MIMO Downlink WiMAX Delay modulation coding 3G mobile communication Long Term Evolution OFDM modulation Bandwidth Signal processing

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Joint Frame and Carrier Frequency Synchronization: Theoretical Considerations and Practical Trade-Offs

Joint Frame and Carrier Frequency Synchronization: Theoretic...

引用

IEEE Digital Signal Processing Workshop

作者： Balasubramanian Ramakrishnan MITRE Corporation Bedford MA USA

ISBN: (纸本)9781424436767

In communication systems which transmit a continuous stream of data, the coded data symbols are typically transmitted in frames. Frames contain one or multiple blocks of coded data. The start of a frame (SOF) is especially required to synchronize the decoder, especially in systems which use block codes such as Turbo and LDPC codes. This process is known as frame synchronization. We examine the general problem of frame synchronization in the presence of a carrier frequency offset. We first look at the theoretical formulation of the problem, and how the maximum-likelihood (ML) based solution is related to the classical periodogram. We then derive an improved ML based frame synchronizer for a commercial satellite waveform, which uses a non-standard SOF. Finally, we discuss implementation complexity and complexity reduction techniques of this new synchronizer on an FPGA.

关键词： Frequency synchronization Digital video broadcasting Frequency estimation Maximum likelihood estimation Maximum likelihood decoding Satellite broadcasting modulation coding Communication systems Block codes Parity check codes

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Cross-layer link adaptation design for relay channels with cooperative ARQ protocol

Cross-layer link adaptation design for relay channels with c...

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

作者： Morteza Mardani Jalil S. Harsini Farshad Lahouti WMC Laboratory School of Electrical and Computer Engineering University of Tehran Iran

The cooperative automatic repeat request (C-ARQ) is a link layer relaying protocol which exploits the spatial diversity and allows the relay node to retransmit the source data packet to the destination, when the latter is unable to decode the source data correctly. This paper presents a cross-layer link adaptation design for C-ARQ based relay channels in which both source and relay nodes employ adaptive modulation coding and power adaptation at the physical layer. For this scenario, we first derive closed-form expressions for the system spectral efficiency and average power consumption. We then present a low complexity iterative algorithm to find the optimized adaptation solution by maximizing the spectral efficiency subject to a packet loss rate (PLR) and an average power consumption constraint. The results indicate that the proposed adaptation scheme enhances the spectral efficiency noticeably when compared to other adaptive schemes, while guaranteeing the required PLR performance.

关键词： Relays Automatic repeat request Protocols Power system relaying Energy consumption Decoding modulation coding Physical layer Closed-form solution Iterative algorithms

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A Simple SNR Representation Method for AMC Schemes of MIMO Systems with ML Detector

A Simple SNR Representation Method for AMC Schemes of MIMO S...

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IEEE Conference on Vehicular Technology (VTC)

作者： Jihoon Kim Kyoung-Jae Lee Inkyu Lee School of Electrical Engineering Korea University Seoul South Korea

ISBN: (纸本)9781424425143

Adaptive modulation and coding (AMC) is a powerful technique to enhance the link performance by adjusting the transmission power, channel coding rates and modulation levels according to channel state information. In order to efficiently utilize the AMC scheme, an accurate signal-to-noise ratio (SNR) value is normally required for determining the AMC level. In this paper, we propose a simple method to represent the SNR values for maximum likelihood (ML) detector in multi-input multi-output (MIMO) systems. By analyzing the relation between the upper bound and the lower bound of the ML detector performance, we introduce an efficient way to determine the SNR for the ML receiver. Based on the proposed SNR representation, an AMC scheme for single antenna systems can be extended to MIMO systems with ML detector. From computer simulations, we confirm that the proposed SNR representation allows us to achieve almost the same system throughput as the optimum AMC systems in frequency selective channels with reduced complexity.

关键词： MIMO Detectors modulation coding Maximum likelihood detection Channel coding Channel state information Signal to noise ratio Performance analysis Upper bound Computer simulation

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Performance improvement in coded cooperation systems using FSK/PSK modulation

Performance improvement in coded cooperation systems using F...

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IEEE Signal Processing and Communications Applications (SIU)

作者： Deniz Celik Ibrahim Altunbas Umit Aygolu Alcatel-Lucent Teletas A.S.Telekomünikasyon A.S. Turkey Elektrik-Elektronik Fakultesi Istanbul Teknik Universitesi Turkey

In this paper, coded user cooperation systems are integrated with combined frequency and phase modulation FSK/PSK. Bit error performance of the proposed scheme is evaluated by computer simulations in quasistatic Rayleigh fading channels. Simulation results show that the FSK/PSK modulation provides much better error performance than the classical MPSK modulation in coded cooperation systems.

关键词： Frequency shift keying Phase shift keying modulation coding Computer errors Binary phase shift keying Phase modulation Computer simulation Fading Computational modeling

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A Digital Code Matched Filter-based non-coherent receiver for low data rate TH-PPM-UWB systems in the presence of MUI

A Digital Code Matched Filter-based non-coherent receiver fo...

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IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

作者： Nuan Song Mike Wolf Martin Haardt Communications Research Laboratory Ilmenau University of Technology Ilmenau Germany

Non-coherent receivers have become promising candidates for low-complexity and low-power Ultra Wide Band (UWB) systems. However, a Non-Coherent Combining Loss (NCCL) is evident in the traditional non-coherent receivers that mainly rely on analog implementations, especially when multiple access techniques are employed. This paper proposes a new Digital Code Matched Filter (DCMF)-based non-coherent receiver for a low data rate Time-Hopping Pulse Position modulation (TH-PPM) UWB system. The DCMF follows after an Analog-to-Digital Convertor (ADC) and is applied before the non-coherent processing. It is matched to the user-specific sequence and reduces the NC-CL. We analyze the performance of the proposed receiver using both full-resolution ADC and one-bit ADC in the presence of Multi-User Interference (MUI) and compare it to the traditional receiver. Analytical bit error rate expressions are also developed and validated for the Additive White Gaussian Noise (AWGN) case.

关键词： Digital filters Matched filters Pulse modulation AWGN Ultra wideband technology Digital modulation modulation coding Analog-digital conversion Performance analysis Interference

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Welcome

Welcome

引用

IFIP Annual Mediterranean Ad Hoc Networking Workshop, Med-Hoc-Net

The following topics are dealt with: cognitive networks; routing; mobile ad hoc networks; 3DLS; cooperative rateless code protocol; random access wireless networks; topology; wormhole attacks; FEC/ARQ; multicast; adaptive modulation; QoS; CSMA/CA; vehicular urban sensing; TDCS; automatic channel assignment; IEEE 820.11; receiver initiated asynchronous duty cycle MAC protocol; wireless sensor network; multipacket reception; orthogonal codes; travel delays; shared random access channels; relay placement.

关键词： Multicast protocols Routing protocols Wireless application protocol Access protocols Wireless sensor networks Mobile ad hoc networks Network topology Automatic repeat request modulation coding Multiaccess communication

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MIMO Performance of the Next Generation DVB-T

MIMO Performance of the Next Generation DVB-T

引用

IEEE Conference on Vehicular Technology (VTC)

作者： P. Atanes A. Arrinda G. Prieto P. Angueira M. M. Velez P. Prieto Electronics and Telecommunications Department University of Basque Country (UPV-EHU) Bilbao Spain Robotiker-Tecnalia Parque Tecnológico Edificio 202 Zamudio Bizkaia Spain

This paper analyses the performance of a DTT (digital terrestrial television) broadcasting system that includes MIMO-OFDM techniques. The benefits of these techniques are studied comparing the results for different MIMO 2 x 2 (multiple input multiple output), MISO 2 x 1 (multiple input single output) and SISO (single input single output) system configurations. Different propagation channel models and configurations are considered for each diversity scheme. This study has been carried out in the context of development of the next generation DVB-T, called DVB-T2.

关键词： MIMO Digital video broadcasting Decoding Polarization Transmitting antennas modulation coding HDTV Performance analysis TV broadcasting Robots

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