نتایج جستجو برای: intersymbol interference isi
تعداد نتایج: 104478 فیلتر نتایج به سال:
In this manuscript, the sinc exponential pulse (SEP) is evaluated at the transmitter and receiver side by using different metrics. The impulse response of the SEP is derived, analysed, and compared with the traditional RC pulse. The SEP is characterized by introducing two new design parameters, adding degrees of freedom to optimize the pulse for a certain transmission scheme and roll-off factor...
We propose a transceiver structure for a frequency selective channel that allows the introduction of reduced redundancy. We optimize jointly the transmitter and receiver in this structure to maximize the information rate. The simulation results show that the proposed design has good performance while increasing the bandwidth efficiency. Keywords— Block transceivers, intersymbol interference (IS...
Turbo-detection applies the “turboprinciple” to iterative equalization and decoding of data transmitted via frequency selective channels. The performance of turbo-detection strongly depends on the ISI (Intersymbol Interference) introduced by the modulator and the waveform channel. In order to achieve higher data rates within GSM (Global System for Mobile Communications), 8PSK modulation will ...
The capacity region of a two-user Gaussian multiaccess channel with intersymbol interference (ISI), where the inputs pass through respective linear systems and are then superimposed before being corrupted by an additive Gaussian noise process, is found. A novel geometrical method is given to obtain the optimal input power spectral densities and the capacity region. This method can be viewed as ...
Bit error rate computation for optical communication systems incorporating equal izers and under both noise and intersymbol interference (ISI) is discussed. An ac curate method based on a saddlepoint approximation is used for the computation. Previous work based on saddlepoint approximation has considered only the use of ba sic integration-and-dump detection. When ISI is strong, this simple ...
Two basic concepts for point-to-point transmission over multiple-input/multiple-output channels with intersymbol interference (MIMO ISI channels) are reviewed and compared. The approaches can be characterized by the way how they deal with multiuser (spatial equalization) and intersymbol interference (temporal equalization). In MIMO orthogonal frequency division multiplexing, temporal equalizati...
In this paper, we derive a capacity inner bound for a synchronous Gaussian Z channel with intersymbol interference (ISI) under input power constraints. This is done by converting the original channel model into an n-block memoryless circular Gaussian Z channel (n-CGZC) and successively decomposing the n-block memoryless channel into a series of independent parallel channels in the frequency dom...
The symmetric cutoff rate is derived for quadratureamplitude-modulated (QAM) block-coded data transmissions over noisy links affected by time-correlated multipathphenomena which introduce intersymbol interference (ISI) in the received signal. Maximum likelihood (ML) decoding supported by perfect channel-state information (CSI) is assumed. Due to the presence of time-correlated ISI phenomena, th...
The capacity region of a two-user linear Gaussian compound Multiple Access Channel with common message (CMACC) and intersymbol interference (ISI) under an input power constraint is derived. To obtain the capacity region we first convert the channel to its equivalent memoryless one by defining an n-block memoryless circular Gaussian CMACC model. We then make use of the discrete Fourier transform...
An iterative technique is developed for orthogonal frequency division multiplexing (OFDM) systems to mitigate the residual intersymbol interference (ISI) that exceeds the length of the guard interval. The technique, called residual ISI cancellation (RISIC), uses a combination of tail cancellation and cyclic restoration and is shown to offer large performance improvements. The effects of imperfe...
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