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检索条件"主题词=modulation coding"

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Adaptive signaling based on measurements with statistical uncertainty

Adaptive signaling based on measurements with statistical un...

引用

Asilomar Conference on Signals, Systems & Computers

作者： Shuangqing Wei D.L. Goeckel Electrical and Computer Engineering Department University of Massachusetts Amherst Amherst MA USA University of Massachusetts Amherst Amherst MA US

In this work, system adaptation under measurement uncertainty is considered for environments where there exist accurate statistical models of how the desired parameter depends on the available measurements. First, previous work on robust adaptive coded modulation using outdated multipath fading estimates is reviewed. The same ideology is then applied to power control when there is statistical uncertainty in the measurement of the path loss and log-normal shadowing. For a single-user system, a closed form power control rule is found, and numerical results are presented which suggest a moderate gain over systems which employ traditional power control functions with an energy margin to compensate for measurement uncertainty. The analogous multi-user power control problem is straightforward to pose, but it has not been amenable to closed form solution to this point.

关键词： Power control Measurement uncertainty Power system modeling Robustness modulation coding Fading Power measurement Loss measurement Shadow mapping Closed-form solution

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Joint design of progressive fixed-rate source-channel codes

Joint design of progressive fixed-rate source-channel codes

引用

Data Compression Conference (DCC)

作者： H. Brunk N. Farvardin Department of Electrical Engineering and Institute for Systems Research University of Maryland College Park MD USA

Summary form only given. The combination of jointly optimized rate compatible punctured convolutional (RCPC) codes and channel-matched tree-structured vector quantizers (CM-TSVQ) is shown to provide improved performance, in some cases, compared to the use of CM-TSVQ. The embedded nature of the RCPC codes and CM-TSVQ is inherited by the jointly optimized combination so that the resulting coder is itself progressive. The joint design algorithm allows unequal error protection to be applied to each bit of the CM-TSVQ output. When refinement bits are sent they may be used either to: (1) provide new source coding bits; (2) provide protection to new source coding bias; or (3) provide further protection to previous source coding bits. Soft decoding is used for the RCPC codes and, to allow equitable comparisons to be made, q-bit soft-decision BPSK modulation is used for the baseline CM-TSVQ (to which we make comparisons). The codebook size of the q-bit soft-decision based CM-TSVQ is 2/sup qrk/ where r is the rate in bits per sample and k is the vector dimension. An illustration of the results obtained for a Gauss-Markov source with correlation coefficient /spl rho/=0.9 and a channel SNR=0 dB is shown below. In this case, k=4 and end-to-end distortion is given in dB. In the cases marked "x", the system complexity precluded calculation of reliable results. Each row of the table shows the performance of a single embedded quantizer, with incremental rates of 0.5 bits per sample provided at each refinement. Our results show that the joint combination of soft-decoded RCPC codes and CM-TCVQ provides little rate-distortion advantage over soft CM-TSVQ at the first step of refinement. The same conclusion may be made about the joint combination of soft-decoded RCPC codes and COVQ versus soft COVQ.

关键词： Source coding Protection Convolutional codes Algorithm design and analysis Error correction codes Decoding Binary phase shift keying modulation coding Gaussian channels Rate-distortion

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Iterative demodulation and decoding of trellis coded CPM

Iterative demodulation and decoding of trellis coded CPM

引用

MILCOM, Military Communications Conference

作者： K.R. Narayanan Department of Electrical Engineering Texas A and M University College Station TX USA

Interleaved trellis coded systems with continuous phase modulation (TCCPM) are considered. It is shown that the combination of a trellis code, interleaver and the CPM modulator results in a significantly enhanced distance spectrum for the transmitted signals. Upper bounds on the bit error rate are derived by considering the combination of the trellis code, interleaver and the CPM modulator as serially concatenated code. Finally, iterative coherent and non-coherent receivers are proposed and their performance is evaluated through computer simulations.

关键词： Demodulation Iterative decoding Convolutional codes Fading modulation coding Continuous phase modulation Interleaved codes Bandwidth AWGN Performance analysis

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An encoding SAR-transponder for target identification

An encoding SAR-transponder for target identification

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： K. Waegel D. Hounam R. Bauer H. Bloetscher M. Zink M. Schwerdt B. Mayr Inst. of Radio Frequency Technol. Aerosp. Res. Establ. Wessling Germany German Aerospace Center Institute of Radio Frequency Technology Wessling Germany

A coded transponder was developed for operation in C-band and verified using the SAR sensor of the Active Microwave Instruments (AMI) on the ERS-1 and ERS-2 satellites. The coded transponder uses signal modulation techniques which affect the SAR signal in both range and azimuth and decouples the transponder signal from the background signal. Encoding adds additional features without losing any of the advantages transponders have over passive targets.

关键词： Encoding Transponders Azimuth Pulse modulation Focusing modulation coding Phase modulation Chirp modulation Image coding Image resolution

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Adaptive SISO algorithms for iterative detection with parametric uncertainty

Adaptive SISO algorithms for iterative detection with parame...

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Communication Theory Mini-Conference

作者： A. Anastasopoulos K.M. Chugg Communication Sciences Institute Electrical Engineering-Systems Department University of Southern California USA

The soft-input soft-output (SISO) module is the basic building block of any iterative receiver for a system consisting of a network of finite state machines (FSM). It is a trellis based algorithm that provides soft information on the input and output of an FSM, with linear complexity on the decision delay D (or the observation length N). When parametric uncertainty is present, the need for adaptive SISOs arises. The proposed solutions either oversimplify the parameter model, or result in exponential complexity on D. In this paper, the exact expression for the soft metrics in the presence of parametric uncertainty modeled as a deterministic constant is rederived in a novel way. Based on this expression, suboptimal algorithms with linear complexity on D and N are presented. The applicability of the proposed algorithms is demonstrated with two examples, namely serially concatenated convolutional codes (SCCC) with carrier phase tracking, and trellis coded modulation (TCM) in frequency-selective fading channels.

关键词： Iterative algorithms Uncertainty Automata Delay Concatenated codes Convolutional codes Phase modulation Frequency modulation modulation coding Frequency-selective fading channels

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Performance comparison of link adaptation and incremental redundancy in wireless data networks

Performance comparison of link adaptation and incremental re...

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IEEE Conference on Wireless Communications and Networking

作者： Xiaoxin Qiu J. Chuang K. Chawla J. Whitehead AT and T Research Laboratories Red Bank NJ USA

Link adaptation and incremental redundancy are two link level techniques proposed to enhance data rate and increase throughput in wireless data networks. Link adaptation pro-actively adjusts the modulation and coding scheme based upon estimated channel conditions. Incremental redundancy, on the other hand, adjusts the code rate to actual channel conditions by incrementally transmitting redundancy information until decoding is successful. In this study, we investigate the system performance of these two techniques. Our results show that incremental redundancy achieves significantly higher throughput compared to link adaptation, especially under high traffic loading conditions. This gain is achieved at the expense of higher terminal and base station complexities, as well as a higher packet delay. On the other hand, in contrast to link adaptation, incremental redundancy does not require any channel quality measurements, and can operate based solely upon ACKs and NACKs.

关键词： Intelligent networks Delay Throughput modulation coding GSM Decoding Telecommunication traffic Ground penetrating radar Redundancy Telecommunication standards

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MMSE space-domain interference suppression for multi-rate DS-CDMA

MMSE space-domain interference suppression for multi-rate DS...

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IEEE Conference on Vehicular Technology (VTC)

作者： W.G. Phoel M.L. Honig ECE Department Northwestern University Evanston IL USA

We consider space-domain interference suppression for reverse-link IS-95 and wideband DS-CDMA (W-CDMA) based on the minimum mean square error (MMSE) cost criterion. An adaptive algorithm for estimating the MMSE combining coefficients for each path is presented which is compatible with IS-95 orthogonal modulation and long spreading codes. The relative performance of noncoherent, maximal ratio (max-ratio), and MMSE combining are compared with mixed (high and low) data rates, where received power is proportional to data rate. Our results show that MMSE combining can offer a significant increase in capacity relative to max-ratio combining. Analytical performance results for W-CDMA based on a large system limit are also presented, and are shown to be accurate even with relatively few combining coefficients.

关键词： Interference suppression Multiaccess communication Diversity reception modulation coding Wideband Mean square error methods Costs Fading Integrated circuit modeling Adaptive algorithm

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Adaptive coded modulation for wireless packet data systems

Adaptive coded modulation for wireless packet data systems

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IEEE Conference on Vehicular Technology (VTC)

作者： H. Stenhoff C. Lindstrand M. Johansson U. Hansson S. Sjoberg Ericsson Mobile Data Design AB Goteborg Sweden Ericsson Radio Systems AB Stockholm Sweden

Selection of modes, i.e. coding and modulation schemes against the current channel is a way to increase the degree of service to individual users as well as improving system capacity in a wireless packet data system. By proper selection of trellis coded modulation schemes, all modes can use a common receiver structure without sacrificing error performance. Apart from a low receiver complexity, this also enables code combining of different modes, which is useful when ARQ is used. Through system level simulations on correlated Rayleigh fading channels it is found that a simple way of selecting the proper mode gives excellent performance.

关键词： modulation coding Data systems Automatic repeat request AWGN Fading Error analysis Robustness Signal to noise ratio Data communication System performance

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Optimum code rate in cellular systems using adaptive modulation

Optimum code rate in cellular systems using adaptive modulat...

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IEEE International Conference on Communications (ICC)

作者： P. Malm O. Edfors T. Maseng Department of Applied Electronics Lund University Sweden

It is essential to find suitable modes (combinations of alphabet sizes and code rates) for transmission in cellular systems. Bad choices result in low spectrum efficiency. An analytical method is proposed to find the modes which give the highest spectrum efficiency when using adaptive modulation. It is demonstrated that data rates considerably higher than 271 and 384 kbps are feasible in GSM and EDGE systems by using adaptive modulation. It is further demonstrated that the spectrum efficiency can be improved more than 100% by using three modes in a GSM system.

关键词： Adaptive systems modulation coding Throughput Rayleigh channels Bandwidth GSM AWGN Bit error rate Quadrature phase shift keying Phase shift keying

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ECF filter design for radar applications

ECF filter design for radar applications

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IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： A.P. Petrovic A.J. Zejak B. Zrnic IMTEL Institute Belgrade Serbia Military Technical Academy Belgrade Serbia

The Envelope Constrained Filter (ECF) concept seems to be a useful tool in filter response shaping applications. There are several applications in radar techniques where the ECF concept can be utilised, such as the range sidelobe suppression in the receiver filter design or the antenna pattern sidelobe suppression in the antenna design. However, the nonfeasible solution case is almost always encountered with these applications. Moreover, a minimax feature of the filter designed is desired then. The original algorithms did not prove successful in such a scenario. The paper presents a novel approach to the ECF design, the main feature of which is the minimax behaviour in the nonfeasible solution case.

关键词： Filters Radar applications Minimax techniques Chirp modulation modulation coding Radar antennas Least squares methods Shape Electronic mail Receiving antennas

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