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检索条件"主题词=Modulation coding"

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Improved Signal Constellations for Differential Unitary Space-Time modulation with Three Transmit Antennas

Improved Signal Constellations for Differential Unitary Spac...

引用

IEEE International Conference on Circuits and Systems for Communications (ICCSC)

作者： Zhengfeng Du Jiee Chen Dongming Wang Zhanjun Jiang Xiqi Gao National Mobile Communications Research Laboratory South-East University Nanjing China

In this paper, we propose new and improved unitary signal constellations for differential unitary space-time modulations system employing three transmit antennas. The proposed unitary design is constructed from fundamental building block which comprises the generator matrix of diagonal cyclic codes, and the 3times3 rotational matrix. Simulation results show that the union bounds on the pairwise error probability (PEP) of the proposed constellations are superior to those of previously proposed Givens rotation based ones.

关键词： Constellation diagram Transmitting antennas Receiving antennas modulation coding Mobile antennas Pairwise error probability Channel capacity Rayleigh channels Transmitters Phase shift keying

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The LTE radio interface - key characteristics and performance

The LTE radio interface - key characteristics and performanc...

引用

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

作者： Anders Furuskar Tomas Jonsson Magnus Lundevall Ericsson Research Limited Sweden

Mobile broadband usage is taking off, demanding improved services and increased capacity of mobile networks. To meet these requirements, 3GPP has defined LTE (the 3GPP Long Term Evolution). This paper presents some key characteristics of the LTE radio interface, including physical layer and radio resource management functions, and evaluates their impact on system performance. As compared to a reference system with more basic characteristics, represented by mobile WiMax, results point to a combined gain in spectrum efficiency of 60% in downlink and 100% in uplink. Cell-edge bitrate gains are about 100% in both downlink and uplink. A closer analysis of the individual system characteristics indicates that these performance differences are due to rather uniform contributions from a set of distinctive features.

关键词： WiMAX Downlink Resource management Bit rate modulation coding OFDM modulation Robust control Delay Long Term Evolution System performance

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Design of Differential Quantization for Low Bitrate Channel State Information Feedback in MIMO-OFDM Systems

Design of Differential Quantization for Low Bitrate Channel ...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Woon Hau Chin Chau Yuen Modulation and Coding Department Institute for Infocomm Research Singapore

The feedback of channel state information have always posed a problem for the design of a communications system where the information is required at the transmitter. In most cases, changing the quantization levels or size of the codebook is used to control the amount of feedback bits. However, the number of quantization levels must be maintained at a sufficiently high level such that the feedback information can still be of use to the transmitter. This paper discusses the use of differential quantization methods to reduce the number of feedback bits required.

关键词： Quantization Bit rate Channel state information State feedback Delta modulation Transmitters OFDM Pulse modulation modulation coding Speech coding

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Reduced tree-search, heuristic and linear decoupler low-complexity MIMO detectors

Reduced tree-search, heuristic and linear decoupler low-comp...

引用

International Conference on Wireless Communication and Sensor Networks

作者： Isaque Suzuki Fernando Ciriaco Taufik Abrao Leonardo D. de Oliveira Electrical Engineering Department State University of Londrina DEEL-UEL Parana Brazil PTC-Telecommunication and Control Engineering Department Escola Politecnica da Universidade de Sao Paulo Brazil

ISBN: (纸本)9781424433278

Since the optimal detector for coded and even uncoded multiple-input-multiple-output (MIMO) antenna systems results too complex when the number of antennas and/or the modulation order index increases, strictly low-complexity detection schemes are considered, aiming to achieve promising performance times complexity trade-off. Under the same throughput basis, this work analyzes some capacity-approaching heuristic and reduced tree-search MIMO detection algorithms, combining simple linear decouplers, local search detectors, particle swarm intelligence (PSO) concepts and parallel short low density parity check codes (LDPC), suitable to uncoded as well to MIMO channel coding. For uncoded MIMO systems, low-complexity PSO approach showed to reach efficiently MIMO near-capacity for any number of transmit and receive antennas configuration, while simple linear decoupler detectors for QPSK modulation with short LDPC coding achieve reasonable performance only for n R ges n T condition.

关键词： MIMO Detectors Parity check codes modulation coding Particle swarm optimization Throughput Algorithm design and analysis Detection algorithms Channel coding Receiving antennas

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Power and bit allocation for goodput optimization in BIC-OFDM systems

Power and bit allocation for goodput optimization in BIC-OFD...

引用

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

作者： I. Stupia F. Giannetti V. Lottici L. Vandendorpe J. Louveaux Department of Information Engineering University of Pisa Pisa Italy Communications and Remote Sensing Lab Universite Catholique de Louvain Louvain La Neuve Belgium

This paper contributes with an adaptive modulation scheme intended for bit interleaved coded (BIC) orthogonal frequency division multiplexing (OFDM) packet transmission in the presence of automatic repeat request (ARQ) protocol. The basic idea consists in properly combining the power allocation strategy with a bit-loading procedure among the different subcarriers so that the rate of information bits received without any error is maximized. Numerical simulations corroborate the effectiveness of the proposed scheme when operating over typical wireless environments.

关键词： Bit rate Automatic repeat request modulation coding Wireless LAN System performance OFDM modulation Interleaved codes Cross layer design Channel coding Digital video broadcasting

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Wideband space-time coded systems with non-collocated antennas

Wideband space-time coded systems with non-collocated antenn...

引用

IEEE Radio and Wireless Symposium (RWS formerly RAWCON)

作者： Haralabos Papadopoulos Carl-Erik W. Sundberg DoCoMo Communications Laboratory USA Inc. Palo Alto CA USA

In this paper we consider space-time coded wideband transmission from multiple base-stations. These systems can provide improved resistance to shadowing and extended range. An inherent challenge with these systems, however, is asynchronous reception of the signal elements. We describe three full space diversity approaches for wideband transmission from non-collocated antennas, with throughput, diversity, receiver-complexity trade-offs. Common to all systems are OFDM-type signaling, bit interleaved coded modulation, and iterative decoding. The lowest data-rate lowest complexity system employs an inner orthogonal space- time block code with embedded OFDM transmission, while the highest data-rate highest complexity scheme does not employ an inner code. The latter scheme can provide even higher data rates at reduced space diversity.

关键词： Broadband antennas Wideband Shadow mapping Receiving antennas Transmitting antennas Throughput Interleaved codes modulation coding OFDM modulation Iterative decoding

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An iterative space-time detector managing the performance-complexity trade-off

An iterative space-time detector managing the performance-co...

引用

Proceedings of the Mosharaka International Conference on Communications, Signals and coding, MIC-CSC

作者： Aurelie Arnoud Olivier Mocquard Jean-Francois Helard

For space-time bit-interleaved coded modulation (ST-BICM) systems, applying a turbo-reception between the space-time (ST) detector and the error-correcting decoder leads to the best performance. However, this receiving technique requires the computation of high quality log-likelihood ratios (LLR). The computation complexity of optimal a posteriori probabilities (APP) by the ST detector is exponential in the ST system dimensions. We propose in this paper a detector that significantly reduces this complexity, while guaranteeing the good quality of LLR. Representing the multiple-input multiple-output (MIMO) system as a tree, the detection consists in searching for the best candidates through the tree by maximizing a metric. The LLR on decoded bits are computed over this list of best candidates. The use of a constant bias value in the cost function accelerates this search by favouring the deeper points of the tree.

关键词： Detectors Iterative decoding MIMO Lattices Interleaved codes modulation coding Signal mapping Transmitters Conference management Cost function

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A Multiplicative and Constant Modulus Signal Based Network coding Method Applied to CB-Relaying

A Multiplicative and Constant Modulus Signal Based Network C...

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IEEE Conference on Vehicular Technology (VTC)

作者： Peter Larsson Ericsson Research Limited Stockholm Sweden

In this paper, a new and simple arithmetic operation for network coding (NC) in wireless communication is proposed. It is built on the assumption of constant modulus signals with phase conveyed information such as PSK and employs, in contrast to classical NC finite field additions, a multiplicative NC operation. The benefit of the method is that it decouples the NC operation from forward error correction (FEC) and modulation imposed joint constraints and thus permits for greater flexibility to adapt code and modulation rates to different user. It may further reduce hardware (HW) complexity and cost for NC enabled relays and it may operate directly on (potentially noisy) baseband signals. The performance of the proposed NC method is examined in a three phase NC bi-directional relaying scenario and compared to a traditional four phase non-NC scheme illustrating performance benefits in the high signal to noise (SNR) region and its viability for the former.

关键词： Network coding Forward error correction modulation coding Relays Arithmetic Wireless communication Phase shift keying Galois fields Hardware Costs

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A Universal Code-Modulated Path-Sharing Multi-Antenna Receiver

A Universal Code-Modulated Path-Sharing Multi-Antenna Receiv...

引用

IEEE Conference on Wireless Communications and Networking

作者： Fred Tzeng Amin Jahanian Payam Heydari Department of Electrical Engineering and Computer Science University of California Irvine CA USA

Conventional multi-antenna systems require multiple RF chains, baseband blocks, and analog-to-digital converters (ADC) in the receiver front-end, mandating substantial increases in power consumption and chip area. In this paper, we introduce a new universal code-modulated path-sharing multi-antenna (CPMA) receiver architecture suitable for any multi-antenna scheme including spatial multiplexing and spatial diversity. The receiver utilizes code modulation to distinguish different antenna signals before combining them in the analog domain. The combined signals propagate through a single shared path and are later recovered in the digital domain for further processing. Due to the spread spectrum nature of code modulation, a larger bandwidth is required for the blocks in the shared path. To alleviate this effect, we examine the use of non-orthogonal signature codes. Analysis and simulation results indicate that by properly selecting non-orthogonal code sets, the spreading factor, and therefore, the overall analog signal bandwidth is reduced while incurring minimal performance degradation.

关键词： modulation coding Bandwidth Radio frequency Baseband Analog-digital conversion Energy consumption Diversity reception Receiving antennas Antennas and propagation Signal processing

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Analysis and Simulation of the GPS-Pseudolite Signals

Analysis and Simulation of the GPS-Pseudolite Signals

引用

International Workshop on Modelling, Simulation and Optimization, WMSO

作者： Ning Dai Lei Zhang Jianyu Wang Shanghai Inst. of Tech. Phys. Chinese Acad. of Sci. Shanghai Chinese Academy of Sciences Beijing Beijing CN

Global positioning system has been extremely matured in the navigation and positioning field. However, there are still some limits in some aspects and some special application areas, the performance should be improved by other techniques. The pseudolite as a GPS-like ground transmitter provides a new research direction to get a high positioning accuracy and reliability. In this paper, we have described the core technologies of design and simulation realization about the C/A codes of the pseudolite system construction. It is shown that the implementation in Matlab contributes to analyzing of the signal structure and designing the C/A codes and both the simulation results and VHDL realization results are consistent.

关键词： Signal analysis Analytical models Global Positioning System Satellite navigation systems Signal generators Shift registers Physics RF signals Frequency modulation coding

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