We address the impact of a too short cyclic prefix on multicarrier systems such as Orthogonal Frequency Division Multiplex (OFDM) and Discrete MultiTone (DMT). The main result is that the intersymbol interference (ISI) and intercarrier interference (ICI) may be spectrally concentrated and analytical expressions showing this are given. A practical implication is, e.g., that the cyclic prefix in ...

Abstruct-Maximum likelihood sequence detection of digital signaling subject to intersymbol interference and additive white Gaussian noise is considered. A new approach to the error probability analysis results in an upper bound which is tighter than the Forney bound. In addition, in the case of infinite-length intersymbol interference a locally convergent bound is shown to hold under fairly gen...

Intersymbol interference in direct detection optical systems can limit the channel spacing in frequency division multiplexing systems, and limit data rates and transmission distances in long distance transmission systems. We present minimum mean-square-error electrical filters to compensate for optical intersymbol interference. The performance of these filters is compared with a matched filter ...

Designing matched pulse shaping filters with their cascade satisfying the Nyquist condition for minimum intersymbol interference constitutes an important task for almost all digital data radio transceivers processing an incoming data signal on the sampleby-sample basis. Despite their practical importance, there are only few sets of Nyquist filter definitions and design techniques to devise digi...

As the major bottleneck in Multigigabit/s communications is the analog-to-digital conversion, its resolution is constrained to not more than a few bits. In this paper we want to discuss the extreme case, which allows just 1-bit quantization. To enable spectral efficient modulation schemes the alternative receiver architecture is based on an oversampling of the received signal. Unlike the existi...