ofdm

Numerical results show that this algorithm can recognize the OFDM signal in a wide SNR range with a high average classification probability.

For you to do engage in OFDM system simulation and related postgraduate theses, and no comprehensive simulation program provide the program.

The thesis realized a prototype of a powerline OFDM communication system which can be practically used in a laboratory environment.

Orthogonal Frequency Division Multiplexing (OFDM) has turned out to be a popular multiple access scheme in wireless networks.

In one example, a non-OFDM signal is received and is processed into an OFDM signal to produce a created OFDM signal.

The computer simulation results show that this algorithm is suitable for OFDM systems with static or slew fading channel.

The invention discloses a method and a device for transmitting pilot in an orthogonal frequency division multiplexing (OFDM) system.

Meanwhile, wavelet transform idea is applied to this paper and a new wavelet de-noising method in OFDM channel estimation is proposed.

Here is a part about the OFDM course and the simulation, does not know is useful, counter- just right thing and everybody sharing.

Orthogonal frequency division multiplex (OFDM) is currently one of the most popular techniques for future broadband wireless communications.

Being one of the core MIMO techniques, the space-time code technique takes a very important status in the MIMO-OFDM system.

The binary data bit of OFDM is modulated on the corresponding subcarrier by PSK or QAM.

Frequency offset tracking is one of the key technologies that affect OFDM systems' performance.

As a hopeful technology to be used in the physical layer of Next G, MIMO-OFDM is becoming the research focus in communication.

However, one of the drawbacks of OFDM is the sensitivity to synchronization error, especially to frequency offset.

Channel Estimation technique is one of the key techniques in OFDM communication systems.

For a multiple-input-multiple-output (MIMO) OFDM system, the required complexity of the ZF and MMSE methods becomes more intractable.

A channel estimation scheme for a multi-input multi-output orthogonal frequency-division multiplexing (MIMO-OFDM) system was presented.

With urged demand on the digital, wideband, personal and mobile communication, OFDM has become one of the hottest topics in this field.

The scheme gives more accurate channel estimates without any change of the system architecture.

Orthogonal frequency division multiplexing (OFDM) systems are very sensitive to the synchronization error.

While in the meantime, OFDM has its own shortcomings: its sensitivity to a frequency offset and the high peak-to-average ratio.

Orthogonal frequency division multiplexing (OFDM) modulation is an effective method for high data rate transmission.

The prerequisites of normal work of OFDM system are the precise time synchronization and the accurate frequency synchronization.

Channel estimation technique is one of the key techniques in OFDM systems.

Simulations show that this is one-symbol convergence estimator with low error.

As one of the key technologies of MIMO OFDM, synchronization comes to the research focus.

Compared with traditional single-user OFDM systems, synchronization technology for OFDMA system are more difficult.

The maximum Doppler frequency shift is an important parameter which affects the performance of the OFDM system.

Therefore, the combination of MIMO and OFDM is an attractive and competitive solution for future broadband wireless systems.

Thus, we study the system modeling for subcarrier allocation in the OFDM-based wireless multimedia networks.

Therefore, the accurate estimation of the channel state information is indispensable for OFDM signal detection and ICI suppression.

The performance of an OFDM system in time-varying channel is analysed in this paper, and an improved receive algorithm proposed.

Secondly, the timing synchronization algorithm for OFDM systems and frequency synchronization algorithm were researched.

A subcarrier allocation algorithm is presented for multiuser MIMO-OFDM communication network based on maximum of the system sum capacity.

Multipath channel simulation of OFDM systems, including encoding, mapping, interleaving, modulation.

Finally, we investigate the combination of space-time coding technique and orthogonal frequency division multiplexing (OFDM) technique.

Orthogonal Frequency Division Multiplexing (OFDM) is a preferred technique in wireless communication systems.

This paper is to research the effects of the RF BPF group delay characteristics on the bit error rate (BER) of the OFDM receiver.

Synchronization algorithm for orthogonal frequency division multiplex (OFDM) systems is discussed.

Aiming at the two great challenges: bandwidth efficiency and multi-paths fading, we propose a blind channel estimation algorithm.

Methods and apparatuses for Orthogonal Frequency-Division Multiplexing (OFDM) communication of non-OFDM radio signals are disclosed.

Thus, method may be used to effectively improve the performance of high-order modulation OFDM systems.

OFDM (orthogonal Frequency division multiplexing) is suitable for communication in multi-path fading and limited bandwidth channel.

By using OFDM technology in WLAN, it has highly increased the transmission speed and achieved high bandwidth efficiency.

The basic thought is to apply the existing blind source separation (BSS) algorithm to the signal detection in MIMO-OFDM systems.

Considering about the characters of power line channel and OFDM, we designed a OFDM system which can be used in power line networks.

Now, frame capture, coarse symbol synchronization of the OFDM system is accomplished after debug, and the whole system is running normally.

In this thesis, synchronization algorithms of symbol timing and carriers frequency offset correction for OFDM are analyzed and researched.

Allocation of antennas and subcarriers is one of most important issue for multiuser MIMO-OFDM system radio resource management.

In the high-speed mobile environment, a high PAPR is a key factor affecting the system performance and achievement of OFDM.

A fast synchronization method is presented for a Space-frequency OFDM ( SF -OFDM) system.

Using two consecutive training symbols, a method for the joint estimation of fine timing and coarse frequency-offset is obtained.

STC-OFDM system can achieve significant performance increase over frequency selective fading channel compared to simple OFDM.

Channel estimation is an important part for OFDM systems performing coherent detection.

In the following, this thesis paid much attention on the research and analysis of the four types of OFDM timing synchronization algorithms.

The better statistics of peak power in the improved transmit signal are demonstrated by simulation results.

In PHY layer, OFDM technique is introduced to guarantee the reliable data transmission in complicated physical environments.

A channel estimation algorithm is proposed for OFDM wireless communication system under time-varying multipath channel.

Finally, the OFDM modulation system and frequency-hopping system are connected by Schematic to constitute FH-OFDM modulation system.

With respect to the complex monitoring environment of multi-user, this paper focused on dynamic resource allocation in MB-OFDM-UWB system.

OFDM modulation system mainly includes constellation mapping, IFFT translation.

Compared to baseband UWB radios, the MultiBand OFDM ultra-wide band system has obtained widespread approval in short-range wireless links.

There are two main aspects about OFDM synchronization technologies: symbol timing synchronization and carrier frequency synchronization.

Accordingly, FH-OFDM modulation system is implemented. Some useful conclusions are gained by analyzing the test results.

The main task is to complete the modeling process of the OFDM transmitter and receiver.

An algorithm of overall resource efficiency measure of digital modulations is cited to calculate the performance of OFDM system.

Combing the MIMO and OFDM technology can achieve high frequency spectrum utilization in frequency selected channel.

Finally, all the modules are integrated to establish a fundamental OFDM base-band processing system.

Both the research and the experiment results of this thesis show that to communicate with 220V powerline network is definitely feasible.

We propose two ICI self-cancellation-based CO-OFDM schemes, and adopt a pilot-aided decision feedback (DFB) loop for CPE compensation.

However, high Peak-to-Power Ratio (PAPR) is always a serious problem which debases the performance of OFDM system very much.

Even though OFDM is suitable for being applied in wireless network, we have to overcome the problem of symbol timing offset.

This paper mainly focuses on the algorithms for channel estimation in OFDM system. It also simulates and analyzes by computer.

V -BLAST is an effective detection method for MIMO OFDM systems, but has a large computational complexity.

So, adaptive allocation technology is one of the most important technologies of OFDM.

The frequency-selective fading makes each channel of OFDM system have different transmission ability.

In this paper, the existed pilot-assisted channel estimation algorithms in OFDM systems are investigated in detail.

OFDM on the binary switch to the metric system for the design of personal MATLAB algorithm, more classic!

The proposed schemes are compared with conventional CO-OFDM schemes at the same spectral efficiency.

A novel OFDM channel estimation algorithm is proposed by exploiting the sparsity of channel impulse response.

In cooperative communications, a study on modulation recognition of adaptive OFDM system is given.

As an effective digital modulation scheme, OFDM is widely used in wideband digital communication systems, such as DVB-T.

This paper focuses on the research of OFDM synchronization algorithms in burst mode communication.

Time-varying characteristic of channels has major effects on transmission quality of OFDM signals.

OFDM technology and its application on p. . . . . .

Based on the channel model of MIMO-OFDM, the basic and improved principles of two channel estimation algorithms: LS and MMSE are given.

An actual OFDM signal is also received and is processed together with the created OFDM signal.

Therefore, the combination of MIMO and OFDM has been the important technique of wideband wireless communication system.

OFDM transforms high bit-rate into low symbol-rate with serial-to-parallel, by which enlarger the symbol interval and to eliminate ISI.

Therefore, the combination of MIMO and OFDM has been the important technique of wideband wireless communication system.

OFDM transforms high bit-rate into low symbol-rate with serial-to-parallel, by which enlarger the symbol interval and to eliminate ISI.

Symbol synchronization is used to confirm OFDM symbol's initiative position for accurate demodulation.

So, studying on synchronization algorithm for OFDM in burst mode has important significance.

Based on the principle of the OFDM technology, the multi-carriers modulation has strong abilities in counteracting the multi-path response.

Initially, fundamentals of OFDM and technologies of cognitive radio are introduced in this paper.

A new blind channel estimation technique is proposed for OFDM systems by exploiting receive diversity.

First of all, the reasons of the effects of BPF group delay on the OFDM system is deduced in theory.

Finally, the problem of CFO compensation in distributed spatial multiplexing MIMO-OFDM systems is addressed.

In addition, with the introduction of OFDM in cooperative systems, the resource allocation becomes more important and challenging.

In addition, with the introduction of OFDM in cooperative systems, the resource allocation becomes more important and challenging.

Subspace algorithm based on the semi-blind system ofdm estimate, and I hope to channel estimation colleagues help!

OFDM has superior performance when transmitting high rate data in wireless fading channel.

To adapt to the severe channel environments, an OFDM synchronization system for DVB-T is presented.

We introduced the accomplished structure of the OFDM demodulation, focusing on the computational process of the valid data extraction.

In view of orthogonality between subcarriers of OFDM system, effect of the finite order of digit shaping filter is discussed in this paper.

Firstly, this thesis introduces the architecture and key techniques of OFDM-based CMMB system.

OFDM and Software Radio are both the charming technology for future mobile communication.

However, OFDM is particularly sensitive to the synchronization errors that can greatly decrease the OFDM system performance.

A novel adaptive subchannel allocation algorithm is proposed for multi-user MIMO-OFDM system.

A novel adaptive subchannel allocation algorithm is proposed for multi-user MIMO-OFDM system.

A new detection scheme was proposed by combining the advantages of subcarrier correlation and antenna grouping based MIMOOFDM system.

With the developed system as a research platform, channel estimation and OFDM symbol timing are carried out.

This thesis focuses on the channel estimation for MIMO-OFDM systems in wireless fading channels.

We apply Sparse Bayesian learning(SBL)to blind OFDM equalization for sparse multi-path channels.

The influence of the integral frequency offset is comprehensively analyzed in COOFDM system.

OFDM on the Fast Fourier Transform personal design MATLAB algorithm, more classic!

It is important for OFDM system to obtain accurate symbol timing and carrier frequency synchronization.

A semi-blind channel estimation algorithm for MIMO-OFDM system is discussed mainly in this paper.

This thesis focuses on the channel estimation and pilot design technology in OFDM-based B3G systems under multi-cell environment.

This thesis focuses on the channel estimation and pilot design technology in OFDM-based B3G systems under multi-cell environment.

Simulation results show that the proposed algorithm converges quickly and it is suitable for time varying scenarios in OFDM systems.

We apply sparse signal processing to OFDM channel estimation under impulse noise.

This paper proposed a channel estimation algorithm that was suitable for short wave broadband OFDM system.

Focus on the low SNR multipath Rayleigh fading channel conditions, based on cumulant OFDM signal blind identification technology.

OFDM and dynamic spectrum optimization technology in the PLC are researched in this paper.

High-Speed Data Communication over Low-Voltage Power Line with OFDM Technique.

Then it discussed in detail about how timing and frequency errors affect OFDM systems.

OFDM system performance is more sensitive to frequency offset and timing error than single-carrier systems.

Present UWB-OFDM PHY layer designs for VHDR, carrying out the simulation and analysis on the systems.

Present UWB-OFDM PHY layer designs for VHDR, carrying out the simulation and analysis on the systems.

Sprint Nextel's plans mark a short-term defeat for Qualcomm, which sells a rival technology called Flash-OFDM.

This method is suitable to the MIMO-OFDM systems which adopt linear precoding.

In addition, an application scenario of OFDM-based TDCS, signalling exchange in the cognitive radio context, is proposed in this paper.

OFDM systems need special synchronizations to minimize the affect of timing error and frequency offset.

An adaptive subcarrier and bit allocation method based on embedded constellation is proposed for multiuser OFDM systems.

This paper implemented a space-time codes project for OFDM communication system based on transmit diversity technology.

Applying Doppler diversity in OFDM system can combat the effect of Doppler spread on system performance.

At last, we design a kind of OFDM-based fast frequency hopping(FFH) system(FFH-OFDM), and represent the FFH-OFDM system implement schemes.

For OFDM relay channels, this paper proposes a novel radio resource allocation algorithm based on selective sub carriers.

Therefore unite MIMO technique and OFDM's these two techniques the consideration becomes a kind of very natural viewpoint.

Multiple groups of bandsenable multiple modes of operation for MultiBand OFDM devices.

Making use of the character of all-phase OFDM frame, this paper proposes the correlation algorithm for frequency estimation in time domain.

OFDM technique has the advantage in combating against frequency-selective fading and providing more effective use of spectrum.

Up-link synchronization In OFDM system is completed by ranging.

In order to increase the OFDM cell identification numbers as well as remain the cell search performance, a new scheme was proposed.

Based on optimal signal subspace (OSS) a adaptive SC-FDE system utilizing the same one bit per subcarrier CSI like OFDM is conceived.

Channel estimation in OFDM and the spreading code in CDMA are researched in this paper.

However, OFDM is sensitive to frequency offset and phase noise.

The OFDM system is very strict in orthogonality of sub-carries, thus it is extremely sensitive to the filter group delay.

And also it can be better to realize the the symbol timing synchronization and carrier synchronization of OFDM.

Solid understanding of digital signal processing, coding theory and modern wireless communication technologies such as OFDM.

Todate, the MultiBand OFDM Alliance has more than 60 participants (and growing) that support a single technical proposal for UWB.

A novel channel estimation algorithm is proposed for MB-OFDM UWB systems based on channel shortening.

However, there are well-known shortcomings of OFDM technology: the timing offset and frequency offset is very sensitive.

The 802. 16E standard, representative of broadBand wireless system, chooses OFDM as its PHY layer framework.

As two block-wished transmission techniques, OFDM and SC-FDE has duality[3].

The first method is based on sending information in a preamble before the OFDM payload symbol.

In addition, combined with OFDM technology, the image transmission system in UWA channel is set up.

In this dissertation, the detail methods of implementing high-speed data bus system which is based on OFDM technique are researched.

It is simply implemented with the phase variation based on the cyclic prefix of OFDM symbols.

Firstly, the development of OFDM and software radio and the significance of their combination are introduced.

Recently, more and more researches are focused on channel estimation techniques of OFDM communication systems.

OFDM technology is a kind of transmitting way to solve effectively the inter symbol interference caused by multi-paths.

OFDMA, on the other hand, allows multiple users to transmit simultaneously on the different subcarriers per OFDM symbol.

In order to need the requirement of higher spectral efficiency, 16QAM is used in the OFDM module.

Performance Analysis and an Improved Receive Algorithm of OFDM Signals in a Time-Varying Channel

Application of Adaptive Antenna Array Techniques Used for the OFDM System

Realization of a Low-Voltage Powerline OFDM Communication System and the Study of its Equalization and Synchronization

Optimal correlation length of symbol timing and frequency offset estimation in OFDM systems

Optimization algorithm of channel partition in OFDM system aimed at the least transmitted time difference

Research of OFDM on Broadcasting Line Carrier Wave Communication of the Train

Analysis of the generalized channel of the wireless OFDM system and blind adaptive channel estimation algorithm for the OFDM system

Research on channel estimation algorithms for OFDM system and its applications in low-voltage power line communication

A Combined Symbol and Sampling Clock Synchronization Method Applied for Differentially Modulated OFDM Systems without Pilot Carriers

Comparative Study on Error Performances of two Pilot-aided Channel Estimation Methods in OFDM Systems

Communication and Direction-Finding Method with Space Time OFDM Transmitted by Array Antenna of Two Beams

An effective iterative algorithm for carrier frequency offset estimate in an OFDM system

Performance Comparison of Two Frequency Tracking Algorithms for OFDM Systems

Transmission and time-frequency analysis of the OFDM signal over the low voltage power-line

A Cyclostationarity-Based Approach to Blind Channel Identification for an OFDM System

An OFDM Technique Based Image Transmission Scheme for a Certain Type of Aircraft

OFDM - Principles and Applications of Orthogonal Frequency Division Multiplexing

Subspace-Tracking Channel Estimation for Training-Sequence-Based OFDM Systems with Transmitter Diversity

The Synchronous Performance Improved of OFDM System with Maximum-Likelihood Timing Offset Estimate Arithmetic

Effect of Companding Arithmetic for Reducing PAPR on Symbol Error Rate of an OFDM System

Performance Analysis of Different Modulations'Abilities to Combat Multipath Propagation in OFDM Systems

Analysis of the Performance of Iterative Estimation and Cancellation of Clipping Distortion in OFDM

Performance Analysis and Simulation of OFDM Systems-with Complementary Sequences Based Blocking Coding

Adaptive subcarrier allocation for spatial multiplexing-based multiuser OFDM-systems

Frequency-offset Synchronization and Channel Estimation for OFDM-Based Transmission system

Frequency Synchronization in OFDM Systems Using Null Subcarriers: Analysis and Improvement

Performance Comparison of the Multilevel Modulation Techniques in OFDM System

Analysis of BER performance of frequency domain differential detection OFDM system in multipath fading channels

A comparative study of pilot-based channel estimators for wireless OFDM

Spectrum Optimization of Multi-user OFDM Communication System Over Single-phase Power Distribution Network

High Efficient and Precise OFDM Carrier Frequency Acquisition and Channel Estimation Algorithms

CCK-OFDM Complementary Code Keying-Orthogonal Frequency Division Multiplexing

OFDM Technology and Its Application in Mobile Communication System

Research on interpolation technology in OFDM system and its realization

Adaptive Resource Allocation Scheme of Multi-service Subcarrier Adjusting and Borrowing for OFDM-Based Systems

An Adaptive Allocation Algorithm for Multiuser OFDM System over Frequency Selective Fading Channels

Subspace-Tracking Channel Estimation for Pilot-Symbol-Aided OFDM Systems with Transmitter Diversity

Adaptive Frequency Offset Synchronization Algorithm for OFDM in Rayleigh Fading Channels

Computer simulation analysis of OFDM system anti-multipath-degradation performance

Application Study of the OFDM in the New Broadband Wireless LAN

Design methods for frequency-domain equalization in OFDM transceivers with transmit diversity

Improving the Performance of OFDM Channel Estimation through Subspace Projecting and Tracking

ESPRIT Based Implementation of Carrier Frequency Offset Estimation for Interleaved Multi-user OFDM

Linear Equalization of Suppression Inter-carrier Interference in OFDM Systems over Block Fading Channel

Synchronization scheme using chaotic signal for OFDM systems and performance comparison

OFDM Principle and Its Applications in Mobile Communication

Discrete Wavelet Based OFDM System Baseband Transform Performance Analyzing

Superimposed Training Power Allocation and Synchronization for OFDM Systems

Low-complexity equalization to OFDM applied in underwater acoustic communications

A pilot energy distribution based frequency synchronization method for wireless OFDM systems

Performance Comparison of Pilot-symbol-aided Channel Estimation Methods for Wireless OFDM Systems

Low-complexity channel estimation in high speed OFDM underwater acoustic communication

A Sparse Channel Estimation Algorithm for Digital Television OFDM Transmission Systems

Multiuser OFDM Systems with Suboptimal Adaptive Allocation Algorithm

Deterministic Blind OFDM Channel Estimation Using Receiver Diversity

Hardware Implementation of Synchronization Subsystem in OFDM Systems

Improved LMS adaptive channel estimation algorithm for OFDM system in low voltage power line communication

Algorithm Implementation of Self-Adaptive Combined Modulation and Bit Allocation in Multi-user OFDM System

Frequency - domain Equalization for OFDM Systems with Insufficient Cyclic Prefix

Training sequence based carrier frequency synchronization method for OFDM system

Improved estimation of frequency synchronization in continuous OFDM system

The simulation analysis of space-time trellis code and OFDM combined communication system performance

Wiener LMS channel estimation and tracking algorithm for OFDM systems with transmitter diversity

Margin adaptive allocation algorithm with average data rate constraint in multiuser OFDM systems

Analysis and Equalization for OFDM with Inter Symbol Interference and Inter Channel Interference

OFDM Technology and Its Application in Power Line Communication

Two Transform Domain Estimation Methods for OFDM System and Their Application Environment

A Simple Adaptive Resource Allocation Scheme for Multiuser OFDM System

A Pilot Subcarrier-based Joint Frequency Offset Correction and Channel Estimation Method for OFDM Systems

A Comparative Analysis on Time Synchronization Schemes in OFDM Systems Based Upon Dispersive Cannel Model

Practical Sub-carries Allocation Algorithms for OFDM System Using Adaptive Modulation

Low-Density Parity-Check Based Differential Unitary Space-Frequency Modulation for MIMO-OFDM Systems

Bit Allocation Algorithm for Low Voltage Network OFDM Systems Based Transmitted Efficiency

Investigation and Implementation of Pilot-Aided Channel Estimation Approach in OFDM System

An Efficient Sub-carrier Allocation Scheme for Multiuser OFDM Systems Using Adaptive Modulation

Technique of synchronization in OFDM systems for powerline communications

Research on modulation identification algorithm for adaptive OFDM systems

Research of Channel Estimation Using Linear Interpolation Technology in OFDM Systems

Noise characteristics analysis of OFDM system in low-voltage power line communication channels

An enhanced iterative joint channel estimation and symbol detection algorithm for OFDM systems

Carrier frequency offset synthetic estimation for OFDM system in Wireless LAN environment

A Synchronization Acquisition Algorithm Using Pilot Symbols for OFDM in HF Communications

Robust Video Transmission over Space-Time OFDM Systems with Scalable Transcoding Capacity

Interpolation Based Frequency Synchronization in OFDM System