Automatic modulation type identification (AMTI) has seen increasing demand for both military and civilian, nowadays. Most of previous methods have been proposed on classification of modulations in additive white Gaussian noise (AWGN) channels. However in real world scenarios, communication channels suffer from dispersion (fading). This paper proposes a novel automatic digital modulation types i...

The availability of software radios and application of interference avoidance may offer a new perspective on communication over dispersive channels. By both lengthening the transmission interval so that ISI is almost inconsequential and by using combinations of channel eigenfunctions to convey the bits, communications over dispersive channels becomes (not surprisingly) a multiuser detection pro...

In this contribution we propose a novel Space-Time Coding (STC) scheme for transmissions over dispersive Rayleigh fading channels, which invokes a Joint-Detection assisted Minimum Mean Square Error based Decision Feedback Equalizer (JD-MMSE-DFE) for jointly detecting the channel-impaired wideband signals of multiple transmit antennas. The performance of the proposed scheme was investigated usin...

The Hiperlan/2 standard [1]-[3] for wireless LAN transmission in the 5 GHz frequency band makes use of OFDM modulation with a TDMA access scheme, in order to efficiently exploit time dispersive channels with frequency selective fading. It is well known that the performance of OFDM schemes is very sensitive to synchronization: symbol timing and carrier frequency errors must be carefully estimate...

Doubly-selective wireless communication channels, i.e., those with significant selectivity in both time and frequency domains, arise in applications operating over wide bandwidths, at high carrier frequencies, and under high mobility conditions. Many systems designed to communicate over such channels are OFDMbased and employ large block lengths to combat capacity loss resulting from the use of ...

Wireless communication systems transferring broadband data in high mobility situations encounter fading channels which are both time and frequency selective. In the noncoherent scenario, the time varying impulse response of the doubly selective channel (DSC) is not available at both the transmitter and the receiver. In this dissertation, we consider the problem of communications over such nonco...

In this paper we propose a new space diversity scheme for broadband PLC systems using orthogonal space-time block coding (OSTBC) transmission combined with single-carrier frequency-domain equalization (SC-FDE). To apply this diversity technique to PLC channels, we first propose a new technique for combining SC-FDE with OSTBCs applicable to all dispersive multipath channels impaired by impulsive...

In this paper, we propose a serial equalizer for doubly-selective channels. We use a Basis Expansion Model (BEM) Finite Impulse Response (FIR) to model the doubly-selective channel and to design the serial equalizer. In contrast to our previous works, we decrease the modeling error of the BEM FIR by fitting the BEM FIR to the true doubly-selective channel over a time-window that is independent ...