In this paper, we study an enhanced subspace based approach for the mitigation of multiple access interference (MAI) in direct-sequence code-division multiple-access (DS-CDMA) systems over frequencyselective channels. Blind multiuser detection based on signal subspace estimation is of special interest in mitigating MAI in CDMA systems since it is impractical to assume perfect knowledge of param...

We perform an asymptotic study of the performance of filter bank multicarrier (FBMC) in the context of massive multi-input multi-output (MIMO). We show that the effects of channel distortions, i.e., intersymbol interference and intercarrier interference, do not vanish as the base station (BS) array size increases. As a result, the signal-to-interference-plus-noise ratio (SINR) cannot grow unbou...

This paper investigates learning and achievable bit error rate (BER) performance of ultra-wideband (UWB) systems that use intelligent multiuser detector (MUD) when communicating over UWB channels that experience both multiuser interference (MUI) and intersymbol interference (ISI), in addition to multipath fading. Multiple access interference (MAI) degrades performance of conventional single use...

Generalized frequency division multiplexing (GFDM) is a promising candidate waveform for next generation wireless communications systems. Unlike conventional orthogonal frequency division multiplexing (OFDM) based systems, it is a non-orthogonal waveform subject to inter-carrier and intersymbol interference. In multiple-input multiple-output (MIMO) systems, the additional inter-antenna interfer...

This paper develops a newmultiuser detector based on a network of kalman filters (NKF) dealing withmultiple-access interference (MAI), intersymbol interference (ISI), and an impulsive observation noise. The two proposed schemes are based on the modeling of the DS-CDMA system by a discrete-time linear system that has non-Gaussian state and measurement noises. By approximating the non-Gaussian de...

In this brief, we propose a new digital receiver for Phase-Shift Keying (PSK) modulation based on the integration of conventional Costas Loop circuit with timing recovery method. The is applied to PSK demodulator using an Iterative Learning Control (ILC) law and it minimization intersymbol interference only one sample per symbol. main advantage proposed method insensitivity frequency offsets wh...

We propose and analyze a wide-band indoor communication system that uses radio as the transmission medium either on a stand-alone basis or to supplement a hard-wired network for those situations where complete portability is desired. One principal impairment to such a system is intersymbol interference caused by frequencyselective fading. A novel media-access scheme is proposed which permits th...

A new concept for digital communication over severe intersymbol interference producing channels, e.g., high–rate digital transmission over twisted pair lines (xDSL techniques) is proposed including channel coding, precoding, equalization, and synchronization. Channel coding improves data reliability or tolerable signal attenuation, e.g., field length, whereas a nonlinear predistortion method, a...

This paper considers iterative detection and decoding on the concatenated communication channel consisting of a two-dimensional magnetic recording (TDMR) channel modeled by the four-grain rectangular discrete grain model (DGM) proposed by Kavcic et. al., followed by a two-dimensional intersymbol interference (2D-ISI) channel modeled by linear convolution of the DGM model’s output with a finite-...

Abstract In [1], a new transmit diversity scheme for channels with intersymbol interference was introduced. The scheme is a generalization of the space-time block coding introduced by Alamouti in [3] to channels with intersymbol interference. The scheme uses two transmit and one receive antenna and achieves the same diversity benefit at the user terminal as can be achieved by using one transmit...