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检索条件"主题词=modulation coding"

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A recursive all-lag reference-code correlator for generating odd correlations

A recursive all-lag reference-code correlator for generating...

引用

IEEE Asia-Pacific Conference on Circuits and Systems

作者： Tung-Sang Ng Kun-Wah Yip Chin-Long Cheng Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong China

ISBN: (纸本)0780362535

An all-lag reference-code correlator generates an all-lag even- or odd-correlation vector at a rate equal to the rate of incoming data samples. Direct implementation of an all-lag reference-code correlator requires N parallel correlators, and the resultant degree of complexity is of the order N/sup 2/, where N is the length of the reference code. In a previous paper, a recursive form for generating all-lag even correlations was derived. In this paper, we derive the recursive form for generating all-lag odd correlations. It is shown that the corresponding correlator can be implemented with a complexity approximately equal to that of a single parallel correlator. That is, the degree of complexity of the proposed recursive all-lag reference-code correlator is of the order N. Thus, substantial reduction in the implementation complexity is achieved.

关键词： Correlators Spread spectrum communication Signal processing Signal generators Sampling methods Councils Delay Circuits modulation coding

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Performance of AMC scheme with cluster allocation in OFDM system

Performance of AMC scheme with cluster allocation in OFDM sy...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： J. Cho Jae-Young Ahn Electronics and Telecommnications Research Institute Daejeon South Korea

To achieve high-bit-rate transmission in a mobile communication system, adaptive modulation and coding (AMC) having lots of variation levels in accordance with fading channel variation is a promising technique. In this paper, we compare the performance of AMC methods with cluster in an OFDM system. The AMC schemes applied into each cluster or cluster group are selected by the minimum or the average SNR value. It is important to compare the simulation result by different cluster patterns because AMC performance can be varied according to the number and position of the cluster. It is shown by computer simulation that the AMC method outperforms the fixed modulation one in terms of bandwidth efficiency and its performance can be determined by the position and number of clusters. Also, the AMC scheme with average SNR shows better the outage and bandwidth efficiency performance than the scheme having minimum SNR value.

关键词： OFDM modulation Fading Feedback Bandwidth Bit error rate Signal to noise ratio modulation coding Clustering algorithms Mobile communication Adaptive systems

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On the Performance Bounds of OFDM-Based 802.16 Broadband Wireless Networks

On the Performance Bounds of OFDM-Based 802.16 Broadband Wir...

引用

IEEE Conference on Wireless Communications and Networking

作者： Ikbal Chammakhi Msadaa Fethi Filali Mobile Communications Department Eurecom Institute Sophia-Antipolis France

In this paper, we evaluate the performance bounds of 802.16 technology under different physical and MAC parameters settings. The saturation throughput that can be reached in 802.16 networks is investigated through several scenarios in which we vary for instance the frame duration, the channel bandwidth, and the modulation and coding scheme in use. An original analytical framework was developed based on technical properties and system profiles specified by the IEEE 802.16 standard for systems using the Wireless MAN-OFDM (Orthogonal Frequency Division Multiplexing) air interface. The obtained results outline the importance of considering the MAC and physical overhead when evaluating the performance of 802.16 networks. They also highlight the impact of packing and fragmentation techniques, proposed by IEEE 802.16 standard, on the MAC performance and show the trade-off between decreasing the channel bandwidth and increasing the resulting saturation throughput.

关键词： Wireless networks Throughput Bandwidth modulation coding Physical layer Mobile communication Standards development OFDM Time division multiple access Communications Society

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A soft-detector based on multiple symbol detection for double differential modulation

A soft-detector based on multiple symbol detection for doubl...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Jianhua Liu M. Simon P. Stoica Jian Li Department of Electrical and Computer Engineering University of Florida Gainesville FL USA Jet Propulsion Laboratory Pasadena CA USA Department of Systems and Control University of Uppsala Uppsala Sweden

We consider the problem of soft-detection for communication systems employing double differential modulation and forward error correction codes, for example, a convolutional code. We propose a soft-detector (based on the multiple symbol heuristic detector) with low computational complexity. Simulation results are provided to show the superior performance of the new soft-detector.

关键词： Decoding Convolutional codes Detectors modulation coding Forward error correction Computational complexity Computational modeling Propulsion Laboratories Communication system control

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An improved pragmatic approach to coded modulation design with multiple carrier frequencies

An improved pragmatic approach to coded modulation design wi...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Ching-Hua Chuang Lin-Shan Lee Department of Electrical Engineering National Taiwan University Taipei Taiwan

An improved pragmatic approach to coded modulation design which provides higher coding gains especially for noisy channels is proposed in this paper. The basic pragmatic approach previously proposed by Viterbi et al. (1989) is adopted, but integrated with the multiple carrier frequency concept. An optimum rate 1/2 convolutional code is used to design a general coded modulation system which can be implemented easily. This new scheme is shown to perform much better than the original pragmatic approach at low to modest signal-to-noise ratio (SNR) conditions. It provides significant coding gains for practical channel conditions but at a price of slight loss in asymptotic coding gain (ACG). The system performance with respect to various design issues, factors and parameters including the signal constellations, mapping rules, ACG's and minimum Euclidean distances are analysed and illustrated in detail. Extensive simulation results also support the concept and demonstrate the validity of the analysis.

关键词： modulation coding Viterbi algorithm Frequency Convolutional codes Signal to noise ratio System performance Signal design Constellation diagram Signal mapping Signal analysis

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Evaluating BER in Sparse IR UWB Networks under the Pulse Collision Model

Evaluating BER in Sparse IR UWB Networks under the Pulse Col...

引用

International Conference on Wireless Networks, Communications and Mobile Computing

作者： G. Giancola M. Di Benedetto School of Engineering INFOCOM Department University of Roma La Sapienza Rome Italy

In this paper, we provide a novel analytical expression for the average BER in impulse radio ultra wide band (IR UWB) networks affected by multi user interference (MUI). BER is evaluated based on the observation that interference in IR is provoked by collisions occurring between pulses belonging to different transmissions. The reference scenario consists of multiple asynchronous users transmitting IR-UWB signals using pulse position modulation (PPM) in combination with time hopping (TH) coding. The proposed method requires specification of a similar set of system parameters as Gaussian-based approaches, but shows improved accuracy in estimating BER, in particular when sparse network topologies are taken into account

关键词： Bit error rate Interference Pulse modulation Power system modeling Additive white noise Gaussian noise Ultra wideband technology modulation coding Network topology AWGN channels

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A PPM Gaussian monocycle transmitter for ultra-wideband communications

A PPM Gaussian monocycle transmitter for ultra-wideband comm...

引用

IEEE Conference on Ultra Wideband Systems and Technologies

作者： S. Bagga W.A. Serdijn J.R. Long Electronics Research Laboratory Faculty of Electrical Engineering Mathematics and Compurer Science (EEMCS) Delft University of Technnology Delft Netherlands

A Gaussian pulse generator incorporating a pulse position modulator for use in an impulse radio ultrawideband system is described. The pulse generator is preceded by a programmable pulse position modulator and comprises a cascade of complex first-order systems, which, in turn, are made up of differential pairs employing partial positive feedback. The resulting PPM Gaussian pulse generator is designed in IBM 0.18 /spl mu/m Bi-CMOS IC technology. Simulations predict the correct operation of the circuit for supply voltages of 1.8 V and a power consumption of 30 mW. The output monocycle indeed approximates a Gaussian monocycle, having a pulse duration of about 250 ps. Proper modulation of the pulse in time is confirmed.

关键词： Ultra wideband technology Pulse modulation Pulse generation Radio transmitters modulation coding Feedback Predictive models Circuit simulation Voltage Energy consumption

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WLC22-3: New Distributed QoS Control Scheme for IEEE 802.16 Wireless Access Networks

WLC22-3: New Distributed QoS Control Scheme for IEEE 802.16 ...

引用

IEEE Globecom 2006

作者： Xiaofeng Bai Abdallah Shami Khalim Amjad Meerja Chadi Assi University of Western Ontario Canada Concordia University Canada

The IEEE 802.16 WirelessMAN standard provides a comprehensive quality-of-service (QoS) control structure to enable flow Isolation and service differentiation over the common wireless network Interface. By specifying a particular set of service parameters, the media access control (MAC) mechanisms defined in the standard are capable of offering service guarantees on the connection basis. However, the design of efficient, flexible and yet bandwidth-saving scheduling algorithms for such QoS provisioning still remains an open topic. This paper proposes a new distributed QoS control scheme that guarantees particular service parameter settings for both uplink and downlink connections. Detailed simulation experiments are presented to study the performance and to validate the effectiveness of the proposed algorithm.

关键词： Distributed control Wireless networks Downlink Quality of service Physical layer Base stations Portable media players modulation coding Frequency conversion Frequency synchronization

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Dynamic physical layers for wireless networks using software radio

Dynamic physical layers for wireless networks using software...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： V. Bose R. Hu R. Morris Vanu Inc. Cambridge MA USA Laboratory for Computer Science MIT USA

The communication parameters in mobile ad-hoc networks, such as the distance between nodes, channel characteristics and user demands, can vary quickly. Using traditional design techniques and creating a static physical layer designed to meet worst case conditions results in poor performance and resource utilization under most operating conditions. Software radios, which implement their physical layer processing in software, provide a solution to this problem by enabling the physical layer to be modified in a way that best meets the current conditions. This paper describes the initial work on a software radio-based ad-hoc network that allows the physical layer to be modified on a per packet basis.

关键词： Wireless networks Software radio Physical layer modulation coding Bandwidth Mobile communication Ad hoc networks Wireless communication Application software Software testing

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WCDMA physical layer modeling for the MUOS project

WCDMA physical layer modeling for the MUOS project

引用

MILCOM, Military Communications Conference

作者： John S. Sadowsky General Dynamics C4 Systems Scottsdale AZ USA

The mobile user objective system (MUOS) uses WCDMA as a basis for its waveform definition. This paper deals with the quasi-analytic method of WCDMA physical layer simulation that has been used extensively for performance simulation, model development for system simulation and development of signal processing algorithms on the MUOS project. Quasi-analytic method offers speedup factors, relative to conventional waveform simulation, of 100x or more. It is shown here that quasi-analytic can also be very accurate.

关键词： Multiaccess communication Physical layer Fingers modulation coding Modems Signal processing Finite impulse response filter Decoding Computational modeling Demodulation

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