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检索条件"主题词=Modulation Coding"

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Narrowband interference mitigation in BICM OFDM systems

Narrowband interference mitigation in BICM OFDM systems

引用

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

作者： Arun Batra James R. Zeidler Department of Electrical and Computer Engineering University of California San Diego CA USA

Orthogonal frequency division multiplexing (OFDM) is noted for its resistance to narrowband interference when equipped with forward error correction. This technique along with erasure insertion is adequate when the the signal-to-interference ratio (SIR) is moderate, around 0 dB, however, when the interference is severe, i.e. SIR = -20 dB, a non-orthogonal interference corrupts a large number of the data subcarriers due to spectral leakage. This situation requires a large number of erasures that compromise the code's error correction capability. The prediction-error filter (PEF) is proposed as an erasure insertion mechanism that localizes the erasures to the tones surrounding the interference, while not affecting the remaining tones. The simulation results indicate excellent performance, for the bit-interleaved coded modulated (BICM) OFDM system using the PEF and BPSK modulation when the SIR = -20 dB in a frequency-selective fading channel.

关键词： Narrowband Interference modulation coding OFDM modulation Forward error correction Error correction codes Filters Interleaved codes Binary phase shift keying Frequency-selective fading channels

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Robust Transmission of H.264 Coded Video Using Three-Stage Iterative Joint Source and Channel Decoding

Robust Transmission of H.264 Coded Video Using Three-Stage I...

引用

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Nasruminallah M. El-Hajjar L. Hanzo School of ECS University of Southampton UK

In this paper we considered jointly optimised source and channel decoding, while employing serially concatenated and iteratively decoded Short Block Codes (SBC) combined with a Unity Rate Code (URC) and multi-dimensional Sphere Packing (SP) modulation. The resultant coded signal is transmitted over non-coherently detected Multiple-Input Multiple-Output (MIMO) Differential Space-Time Spreading (DSTS) designed for near capacity joint source-channel decoding (JSCD). The performance of the system was evaluated by considering interactive video telephony using the H.264/AVC source codec. The source coded parameters generated by the state-of-the-art H.264/AVC video codec typically contain limited natural residual redundancy. Therefore, to improve the error robustness of iterative sourcechannel decoding (ISCD), SBCs are incorporated to impose artificial redundancy on the source coded parameters. The natural residual redundancy after source coding and the artificial redundancy due to SBC coding is iteratively exploited in a turbo process to improve the overall Bit Error Ratio (BER) and objective video quality performance quantified in terms of the Peak Signal to Noise Ratio (PSNR). The convergence behaviour of the advocated MIMO transceiver is investigated with the aid of Extrinsic Information Transfer (EXIT) charts. The proposed system exhibits an E b /N 0 gain of about 22 dB at the PSNR degradation point of 2 dB in comparison to the benchmarker scheme carrying out DSTS aided SP-demodulation as well as iterative source and channel decoding, when using I system = 5 system iterations, while communicating over correlated narrowband Rayleigh fading channels.

关键词： Robustness Iterative decoding Redundancy MIMO PSNR Automatic voltage control Concatenated codes Block codes modulation coding Signal design

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Throughput enhancement of joint AMC and power control with diversity combining for next generation mobile satellite systems

Throughput enhancement of joint AMC and power control with d...

引用

IEEE Princeton Section Sarnoff Symposium

作者： Adeyemi A. Ajibesin H. Anthony Chan Muhammadou Kah Department of Electrical Engineering University of Cape Town South Africa School of Information Technology and Communications American University of Nigeria Nigeria Huawei Technologies Company Limited Plano TX USA

An enhanced adaptive scheme based on threshold method with a reduced complexity that combine adaptive modulation and coding with diversity combining is presented for throughput maximization in broadband code division multiple access (CDMA) satellite networks. The proposed algorithm is a modify, enhanced, and more robust version of the existing algorithms for adaptive transmission rate and modulation in CDMA networks. The rate compatible punctured turbo-coded (RCPT), which has been found to give improved throughput performance in a direct sequence (DS) CDMA is exploited. A semi-analytical process and simulations were carried out. It is found that there are significant improvement in the average throughput and the bit-error performance. The proposed algorithm using adaptive coding and modulation (instead of variable spreading gain) outperforms other systems such as Selective Power Control with Active Link Protection (SPC-ALP) algorithm proposed for adaptive transmission rate and power control in CDMA networks.

关键词： Diversity reception Throughput Power control Satellites Multiaccess communication modulation coding Adaptive systems Robustness Turbo codes Adaptive coding

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Research on Signal Processing Method for Ranging System Based on a New Combined modulation Waveform

Research on Signal Processing Method for Ranging System Base...

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WRI International Conference on Communications and Mobile Computing, CMC

作者： Xinhong Hao Zhanzhong Cui School of Aerospace Science and Engineering Beijing Institute of Technology Beijing China

A kind of signal processing method combing autocorrelation detection and FM harmonic detection technology is presented for the radio ranging system based on pseudo-random binary-phase code and linear frequency combined modulation. The mathematic model of ranging system is studied. The virtual simulation model for ranging system is established and the ranging property is analyzed. The simulation results of ranging resolution are consonant with the calculation values. The results are addressed that the ranging method has excellent ranging precision.

关键词： Signal processing Frequency modulation Chirp modulation modulation coding Power harmonic filters Correlators Band pass filters Autocorrelation RF signals Mobile communication

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Transmit power allocation for self-organising future cellular mobile radio networks

Transmit power allocation for self-organising future cellula...

引用

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

作者： Philipp P. Hasselbach Anja Klein Ingo Gaspard Communications Engineering Lab Technische Universitat Darmstadt Germany Deutsche Telekom Research and Development Laboratories Darmstadt Germany

ISBN: (纸本)9781424451227;9781424451234

Future mobile radio networks are expected to witness an increase in capacity demand. Since the spectrum suited for mobile radio application is scarce, the spectrum efficiency of future mobile radio networks has to be increased in order to be able to meet the capacity demand. In networks applying adaptive modulation and coding, both, transmit power and bandwidth can be considered as resources. In order to achieve high spectrum efficiency, the adaptation of the allocation of transmit power and bandwidth to the time-varying capacity demand is an important topic. In this paper, an approach that adjusts the allocation of transmit power to the cells in order to adapt the network to changing capacity demands is proposed. A mathematical model that relates transmit power and the probability of outage in the cells is presented and used in an approach for the minimsation of the outage probability in the cells using convex optimisation techniques. The performance of the presented approach is evaluated and its suitability for the adaptation of the network to capacity hotspots is shown. Due to the use of a mathematical model and convex optimisation techniques, the presented approach is suited for self-organising optimisation.

关键词： Cellular networks Land mobile radio Bandwidth Adaptive systems Mathematical model Signal to noise ratio modulation coding Power system modeling Mobile communication Power engineering and energy

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Adaptive acoustic underwater communications based on generalized multi-carrier interleave-division multiplexing

Adaptive acoustic underwater communications based on general...

引用

OCEANS - Europe

作者： Peter Adam Hoeher ComSupport GbR Heikendorf Germany

In this contribution, an adaptive underwater acoustic modem with high bandwidth and power efficiency is proposed. Key features include interleave-division multiplexing (IDM) in time and frequency domain (and optionally in the spatial domain) in conjunction with generalized (non-orthogonal) multi-carrier (MC) transmission. IDM is a special form of superposition coded modulation. At the receiver side, joint intersymbol interference (ISI) and adjacent channel interference (ACI) cancellation is performed, in addition to iterative decoding. Adaptation (with respect to variable data rates, variable signal power, variable signal bandwidth, variable range, variable channel conditions, variable service requirements, etc.) is supported to an extend, which is currently unknown in the area of underwater communications. The communication signal can be used for navigation/positioning purposes without modification at the transmitter side. The system design is easily applicable in underwater networks, and extendable to an arbitrary number of transducers (MIMO processing). The modem is implemented by means of software-defined radio. A wide range of potential applications is targeted.

关键词： Underwater acoustics Underwater communication Modems Bandwidth Intersymbol interference Frequency domain analysis modulation coding Interchannel interference Interference cancellation Iterative decoding

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Exponential Effective SIR metric for LTE downlink

Exponential Effective SIR metric for LTE downlink

引用

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

作者： Joan Olmos Albert Serra Silvia Ruiz Mario García-Lozano David Gonzalez Signal Theory and Communications Department Universitat Poliltècnica de Catalunya Barcelona Spain

ISBN: (纸本)9781424451227

3GPP LTE is the evolution of UMTS which will make possible to deliver next generation high quality multimedia services according to the users' expectations. The flexibility of the downlink OFDM radio interface with Adaptive modulation and coding (AMC), MIMO and H-ARQ plays a crucial role in achieving the low latency and high spectral efficiency promised by the new radio access standard. This paper presents a LTE DL link level simulator whose main purpose is to generate suitable look-up tables to interface with a system level simulator. In this context, the Exponential Effective SIR (EESIR) metric is a link abstraction model that is used to properly characterize multistate channels. The reference BLER curves in AWGN channel and the parameters of the EESIR model are given for the complete list of CQI's specified for LTE DL. The obtained results also include curves of mean link level throughput for different AMC formats and MIMO configurations.

关键词： Downlink MIMO Throughput Redundancy 3G mobile communication modulation coding OFDM modulation AWGN channels Physical layer Bandwidth

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Low complexity soft detection for spatially multiplexed BICM MIMO OFDM system

Low complexity soft detection for spatially multiplexed BICM...

引用

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

作者： Rizwan Ghaffar Raymond Knopp Eurecom Institute Sophia-Antipolis France

This paper presents a new approach to soft detection of spatial data streams in multiple input multiple output (MIMO) channels in slow fading channels. We focus on high spectral efficiency bit interleaved coded modulation (BICM) MIMO OFDM system where, after serial to parallel conversion and per antenna coding, spatial data streams are simultaneously transmitted by using an antenna array. We propose a detection algorithm based on a combination of linear and non linear detection techniques. The proposed algorithm orders spatial streams as per V-BLAST ordering and then uses linear detectors like MMSE or zero forcing (ZF) to detect the streams which have seen good channel realizations and therefore enjoy higher signal-to-noise-ratios (SNRs). These streams, after being detected, are subsequently stripped off leading to max log MAP detection of the streams which have seen comparatively poor realizations of the channel and consequently have lower SNRs. Unlike maximum likelihood (ML) detection, whose complexity is huge due to the need for enumerating all possible combinations of the transmitted constellation points, the proposed method has low complexity and moreover has a fully parallel structure suitable for the implementation in parallel hardware. Numerical examples illustrate the performance of proposed algorithm for slow fading 3times3 and 4times4 complex MIMO channels in comparison to linear and max log MAP detection.

关键词： MIMO Fading Transmitting antennas Maximum likelihood detection Interleaved codes modulation coding OFDM modulation Antenna arrays Detection algorithms Detectors

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Multipath division turbo equalization with block inter-carrier interference cancellation in cellular system with amplify-and-forward relaying

Multipath division turbo equalization with block inter-carri...

引用

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

作者： Katsuya Kato Ryota Yamada Takashi Yoshimoto Kazuyuki Shimezawa Minoru Kubota Naoki Okamoto Advanced Image & Telecommunication Laboratories Corporate Research and Development Group Sharp Corporation Japan

This paper proposes multipath division turbo equalization with block inter-carrier interference cancellation (MD-BIC) for orthogonal frequency division multiplexing (OFDM). When the multipath delay difference exceeds the cyclic prefix (CP) length, the OFDM transmission performance suffers severely due to inter-symbol interference (ISI) and inter-carrier interference (ICI). Cellular systems with amplify-and-forward (AF) relay stations, for example, might cause a long delay due to their process delays. Therefore, mobile terminals served by AF relay systems should compensate for the influence of ISI and ICI. MD-BIC divides a series of paths into several blocks by using a log likelihood ratio (LLR) that is computed in the decoding process. The delay difference within each block is limited so as not to exceed the CP length. This means that ISI and ICI are mitigated in each block. Computer simulations demonstrate that the proposed scheme can achieve excellent performance in the severe multipath channels where the delay difference is greater than the CP length.

关键词： Interference cancellation Relays Delay Intersymbol interference OFDM Decoding Signal processing Detectors Computer simulation modulation coding

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A Trellis-Coded modulation Scheme with a Novel Expanded 16-Dimensional Constant Envelope Q2PSK Constellation

A Trellis-Coded Modulation Scheme with a Novel Expanded 16-D...

引用

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Milton I. Quinteros Edit J. Kaminsky Kenneth V. Cartwright Department of Electrical Engineering EN 616A Lakefront Campus University of New Orleans New Orleans LA U.S.A School of Sciences and Technology College of The Bahamas Nassau N.P Bahamas

This paper presents a TCM scheme that uses a new expanded 16-Dimensional Constant Envelope Q 2 PSK constellation along with a simple convolutional encoder of rate 2/3. An effective gain of 2.67 dB over uncoded CEQ 2 PSK is achievable with low complexity, and without suffering from constellation expansion penalty. Larger coding gains are easily achieved with encoders of higher rates. In addition, an optimal hardware implementation of the required decoders is described.

关键词： Convolutional codes Multidimensional systems Constellation diagram Convolution Gain Hardware Decoding modulation coding Quadrature phase shift keying Lakes

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