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检索条件"主题词=Modulation Coding"

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Sequential design of a 8192 complex point FFT in OFDM receiver

Sequential design of a 8192 complex point FFT in OFDM receiv...

引用

IEEE Asia-Pacific Conference on ASIC (AP-ASIC)

作者： Se Ho Park Dong Hwan Kim Dong Seog Han Kyu Seon Lee Sang Jin Park Jun Rim Choi School of Electronic and Electrical Engineering Kyungpook National University Taegu South Korea System IC LG Corporate Institute of Technology Seoul South Korea

In this paper we propose an implementation method for a single-chip 8192 complex point FFT in terms of sequential data processing. In order to reduce the required chip area for the sequential processing of 8 K complex data, a DRAM-like pipelined commutator architecture is used. The 16-point FFT is a basic building block of the entire FFT chip, and the 8192-point FFT consists of the cascaded blocks with six stages of radix-4 and one stage of radix-2. Since each stage requires rounding of the resulting bits while maintaining the proper S/N ratio, the convergent block floating point (CBFP) algorithm is used for the effective internal bit rounding. As a result the proposed structure brings about the 55% chip size reduction compared with conventional approach.

关键词： OFDM modulation Demodulation Very large scale integration Digital modulation modulation coding Hardware Discrete Fourier transforms Data processing Code standards Fast Fourier transforms

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The BCH coded digital radio communication system under man-made noise environments

The BCH coded digital radio communication system under man-m...

引用

IEEE International Symposium on Electromagnetic Compatibility (EMC)

作者： S. Unawong S. Miyamoto N. Morinaga Osaka Daigaku Suita Osaka JP

Man-made radio frequency noise emitted from electrical and electronic apparatus is well known to be a major cause of performance degradation of digital radio communication systems. In this paper, in order to decrease the effect of man-made radio noise on the bit error rate performance of the /spl pi//4-shift QPSK modulation system, we employ the Bose-Chaudhuri-Hocquenghem (BCH) forward error correction coding scheme. Numerical results demonstrate that, under man-made radio noise environments, the improvements in the performances of the /spl pi//4-shift QPSK system can be achieved by using the BCH coding scheme.

关键词： Digital communication Working environment noise 1f noise Quadrature phase shift keying Bit error rate Forward error correction Performance evaluation Radio frequency Degradation modulation coding

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A new frequency-domain link adaptation scheme for broadband OFDM systems

A new frequency-domain link adaptation scheme for broadband ...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： S. Muneta Y. Matsumoto N. Mochizuki M. Umehira NTT Network Service Systems Laboratories Yokosuka Japan

This paper proposes an OFDM-oriented link adaptation scheme with new frequency-domain-based link quality estimation functions. System throughput of an OFDM system can be enhanced by using link adaptation; the best set of modulation scheme and FEC coding rate is dynamically selected to achieve the target packet error rate (PER) before ARQ. An important practical issue in applying link adaptation is how to estimate the link quality precisely. Link quality is well assessed by carrier/noise ratio (CNR) and the delay spread. Two link quality estimation functions are introduced; one examines the correlation between subcarriers while the another considers CNR. Both are simple to implement in combination with the frequency-domain initial equalizer. Simulation results verify that the proposed link adaptation scheme is effective in improving system throughput in a practical manner.

关键词： Frequency estimation Throughput modulation coding OFDM modulation Forward error correction Error analysis Automatic repeat request Signal to noise ratio Delay Equalizers

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Orthogonality division multiple access LTI transmit filters for ISI-channels

Orthogonality division multiple access LTI transmit filters ...

引用

IEEE International Conference on Communications (ICC)

作者： A.F. Shalash K.K. Parhi Level One Communications New Jersey Design Center Morganville NJ USA Department of Electrical and Computer Engineering University of Minnesota Minneapolis MN USA

In this paper, the problem of multiple access over digital subscriber loops is introduced and defined as FIR LTI filter design over linear dispersive channels. The 2-D FIR CAP/QAM based modulation line code is extended to the multi-dimensional system to accommodate multiple access topology. The concept of orthogonality division multiple access, ODMA, is used as the methodology to achieve that goal. The problem of increasing the number of dimensions is stated as a minimax optimization problem, then solved using sequential quadratic programming. 3, 4, and 6-dimensional systems are introduced to support multiple access applications. Computer simulations are carried out to evaluate the performance and functionality of the orthogonal signaling line code.

关键词： Finite impulse response filter DSL Digital filters Nonlinear filters Dispersion Quadrature amplitude modulation modulation coding Multidimensional systems Topology Minimax techniques

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Cost-effective calibration transponders for future synthetic aperture radars

Cost-effective calibration transponders for future synthetic...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： K. Dumper C.H. Buck A.W.J. Dawkins Systems Engineering and Assessment Limited Bath UK European Space Agency ESTEC NL Noordwijk Netherlands Space Department Defence Evaluation and Research Agency Farnborough UK

This paper summarises some results of a study funded by the Technology Research Programme (TRP) of the European Space Agency (ESA). The study was undertaken by Systems Engineering and Assessment Ltd (SEA) supported by the Defence Evaluation and Research Agency (DERA). The contract addressed concepts and architectures for cost-effective calibration transponders for future SAR systems. coding, i.e. deliberately modifying the transponded signal in some way to distinguish it from normal echoes, is of interest for future SAR calibration transponders. Therefore, a number of coded transponder trials were performed and analysed, with the results feeding into the study aspects. The coded transponder trials were performed during 1998, using a transponder supplied by DERA and the Digital SAR Experimental Modulator (DSEM) developed by SEA. The DSEM is a programmable multi-channel digital processor which allows the generation of many different coded signals. The equipment was deployed at Lasham Airfield in England and operated successfully on several ERS-2 passes. A variety of coding schemes was tried, including both azimuth and pulse coding, usually with a number of different coded signals on a single pass. The trials data were processed and analysed by SEA using a modified version of the SEA SAR Processor with decoding functions included. An Advanced Calibration Transponder is proposed which is particularly suited for ASAR and future SAR systems where many more measurements will be required.

关键词： Calibration Transponders Space technology Systems engineering and theory Contracts Performance analysis Digital modulation modulation coding Signal generators Signal processing

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Variable dwell-time code acquisition for FFH/MFSK spread spectrum systems under band multitone jamming and white Gaussian noise

Variable dwell-time code acquisition for FFH/MFSK spread spe...

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IEEE International Conference on Communications (ICC)

作者： Wern-Ho Sheen Huan-Chun Wang Chun-Chieh Tseng Department of Electrical Engineering National Chung Cheng University Chiayi Taiwan

Variable dwell-time code acquisition based on multiple-dwell and novel sequential tests is investigated for fast frequency hopped MFSK systems under the effects of white Gaussian noise and band multitone jamming. 1- and 2-dwell tests are of particularly interest for the multiple-dwell tests for practical consideration. Numerical results show that (i) diversity with fast frequency hopping can significantly improve the acquisition performance for 1- and 2-dwell tests, especially in a heavily jammed environment, and (ii) the proposed novel sequential tests significantly outperform 1- and 2-dwell tests and are quite robust to the effects of non-ideal jammer state information. Our analytical results are verified by computer simulations.

关键词： Spread spectrum communication Jamming Sequential analysis Diversity reception System testing Gaussian noise Forward error correction Frequency synchronization modulation coding Frequency conversion

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Wavelet-based orthogonal modulation code

Wavelet-based orthogonal modulation code

引用

Asilomar Conference on Signals, Systems & Computers

作者： E.-J. Yi E.J. Powers Department of Electrical and Computer Engineering and Telecommunication and Signal Processing Research Center University of Texas Austin Austin TX USA

We suggest a new wavelet-based orthogonal modulation code set for multiple access, using various orthogonal scale functions and mother wavelets. Specifically we compare the bandwidth of these new wavelet-based orthogonal modulation codes with that of traditional orthogonal codes based on the Hadamard matrix and impulse function. The bandwidths of these wavelet-based modulation codes strongly depend on the choice of wavelets and scale functions which are used to generate these new codes. Generally speaking, we find that the bandwidths of these new modulation codes are considerably smaller than those of the orthogonal code set based on the Hadamard matrix and impulse function.

关键词： modulation coding Bandwidth Error correction Error correction codes Discrete wavelet transforms Wavelet analysis Image coding Signal processing Digital modulation Wavelet transforms

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Adaptive coded-modulation in multipath fading channels

Adaptive coded-modulation in multipath fading channels

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IEEE Conference on Vehicular Technology (VTC)

作者： Young Min Kim W.C. Lindsey Communication Science Institute University of Southern California Los Angeles CA USA LinCom Corporation Los Angeles CA USA

We have seen an explosive expansion and growth in wireless communications and a vision of communicating; any-where any-time is becoming reality. Future mobile radio systems are projected to support a data rate of up to a few Mbps. Considering current digital mobile radio systems are being operated at a spectral efficiency less than 1 bit/sec/Hz, the spectral efficiency of future wireless systems must be increased substantially to maximize the utilization of scarce radio spectrum and to make such high data rate services economically feasible. Adaptive coded modulation (ACM) is a promising way to provide a substantial improvement in spectral efficiency for slow fading channels. The basic idea is to adapt system functionality such as modulation, coding, information rate, and transmission power to varying channel conditions. In this work the potential of adaptive coded modulation was investigated using cut-off rate analysis in multipath fading channels. It was shown that the adaptive coded modulation can provide several folds of increase in spectral efficiency compared to a fixed modulation system employing QPSK when the channel varies slowly.

关键词： Fading Frequency modulation coding Shape Power system modeling Channel state information Pulse shaping methods AWGN Mobile communication Explosives

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On the design of space-time codes

On the design of space-time codes

引用

Information Theory and Networking Workshop

作者： H. El Gamal A.R. Hammons Hughes Network Systems University of Maryland College Park MD USA

The design of space-time codes to achieve full spatial diversity over fading channels has largely been addressed by handcrafting example codes using computer search methods and only for small numbers of antennas. The lack of more general designs is in part due to the fact that the diversity advantage of a code is the minimum rank among the complex baseband differences between modulated code words, which is difficult to relate to traditional code designs over finite fields and rings. In this paper, we present general binary design criteria for PSK-modulated space-time codes. For linear BPSK/QPSK codes, the rank of (binary projections of) the unmodulated code words, as binary matrices over the binary field, is a sufficient design criterion: full binary rank guarantees full spatial diversity. This criterion accounts for much of what is currently known about PSK-modulated space-time codes. We develop new fundamental code constructions for both quasi-static and time-varying channels. These are perhaps the first general constructions-other than delay diversity schemes-that guarantee full spatial diversity for an arbitrary number of transmit antennas.

关键词： Space time codes Fading Search methods Baseband modulation coding Galois fields Binary phase shift keying Quadrature phase shift keying Time-varying channels Delay

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Adaptive trellis coded MQAM and power optimization for OFDM transmission

Adaptive trellis coded MQAM and power optimization for OFDM ...

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IEEE Conference on Vehicular Technology (VTC)

作者： Sai Kit Lai R.S. Cheng K.B. Letaief R.D. Murch Center for Wireless Information Technology Department of Electrical & Electronic Engineering Hong Kong University of Science and Technology Hong Kong China Hong Kong University of Science and Technology Kowloon HK

We propose an adaptive trellis coded modulation orthogonal frequency division multiplexing (ATCM-OFDM) scheme to provide high rate transmission with high spectral efficiency for an indoor environment. Our objective is to minimize the overall transmit power in each OFDM transmission by optimizing the power distribution, the code rate and modulation scheme in each OFDM subchannel so as to maintain a constant data transmission rate and a fixed bit error rate (BER). In the simulation, the ATCM-OFDM scheme can achieve more than 7 dB power reduction compared with the OFDM scheme using fixed TCM.

关键词： modulation coding OFDM modulation Fading Delay Frequency conversion Power distribution Data communication Bit error rate Mobile communication Intersymbol interference

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