Description: The Interleaved Frequency Division Multiple Ac-
cess (IFDMA) scheme is based on compression, repetition and
subsequent user dependent frequency shift of a modulated signal.
Multiple access is enabled by the assignment of overlapping but
mutually orthogonal subcarriers to each user. In this paper it
is shown that IFDMA can be regarded as unitary precoded
OFDMA with interleaved subcarriers. On the other hand,
IFDMA is shown to be a CDMA variant with frequency domain
orthogonal signature sequences and chip interleaving. Thus, it
combines the advantages of single and multi carrier transmission
such as low peak to average power ratio, orthogonality of the
signals of different users even for transmission over a time
dispersive channel and low complexity. Simulation results show
the good performance of coded IFDMA transmission over a
mobile radio channel for different data rates. Platform: |
Size: 529408 |
Author:Casper |
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Description: Adaptive equalization教程-Adaptive equalizers compensate for signal distortion
attributed to intersymbol interference (ISI), which is
caused by multipath within time-dispersive channels.
Typically employed in high-speed communication
systems, which do not use differential modulation
schemes or frequency division multiplexing
The equalizer is the most expensive component of a data
demodulator and can consume over 80 of the total
computations needed to demodulate a given signal [01]
Adaptive Equalization
KEVIN BANOVIC Slide 3
RESEARCH CENTRE FOR INTEGRATED MICROSYSTEMS – UNIVERSITY OF WINDSOR
EQUALIZATION TUTORIAL
Channel
Equalizer
Adjustment
FIR
Equalizer
Decision
Device
Error
Computation
s k ( ) y k ( )
e k ( )
r k ( ) s k ( )
Training
Sequence
Symbol
Statistics
Blind Mode
Decision-Directed
Mode Training Mode
Adaptive Equalization Platform: |
Size: 404480 |
Author:陈鹏 |
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Description: LMS算法对线性色散信道的自适应均衡，并且信道的加性噪声为未知-the use of the LMS algorithm for adaptive equalization of a linear dispersive channel that produces (unknown) distortion Platform: |
Size: 1024 |
Author:cyzhope |
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Description: matlab实现了OFDM功能，ACO-OFDM可以在可见光中使用。-Orthogonal frequency division multiplexing (OFDM)
is a modulation technique which is now used in most new and
emerging broadband wired and wireless communication systems because it is an effective solution to intersymbol interference caused by a dispersive channel. Platform: |
Size: 2048 |
Author:刘伟 |
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Description: frequency division multiplexing (OFDM) is used extensively in broadband wired and wireless communication systems because it is an effective solution to intersymbol interference (ISI) caused by a dispersive channel. This becomes increasingly important as data rates increase to the point where, when conventional serial modulation schemes like quadrature amplitude modulation (QAM) or NRZ are used, the received signal at any time depends on multiple transmitted symbols. In this case the complexity of equalization in serial schemes which use time domain equalization rises rapidly. In contrast, the complexity of OFDM, and of systems using serial modulation and frequency domain equalization, scale well as data rates and dispersion increase. [1]–[3]. A second major advantage of OFDM is that it transfers the complexity of transmitters and receivers the analog to the digital domain-frequency division multiplexing (OFDM) is used extensively in broadband wired and wireless communication systems because it is an effective solution to intersymbol interference (ISI) caused by a dispersive channel. This becomes increasingly important as data rates increase to the point where, when conventional serial modulation schemes like quadrature amplitude modulation (QAM) or NRZ are used, the received signal at any time depends on multiple transmitted symbols. In this case the complexity of equalization in serial schemes which use time domain equalization rises rapidly. In contrast, the complexity of OFDM, and of systems using serial modulation and frequency domain equalization, scale well as data rates and dispersion increase. [1]–[3]. A second major advantage of OFDM is that it transfers the complexity of transmitters and receivers the analog to the digital domain Platform: |
Size: 415744 |
Author:kartick |
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Description: 文章介绍了OFDM解调方式在水下时间反转信道中的应用研究。-This work addresses the problem of OFDM transmission
in dispersive underwater channels where impulse responses
lasting tens of miliseconds cannot be reliably handled
by recently proposed methods due to limitations of channel
estimation algorithms. Platform: |
Size: 389120 |
Author:王峰 |
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Search - dispersive channel