We study the asymptotic behavior of the smallest singular value of the Single Input Multiple Output (SIMO) channel filtering matrix. We prove that this can be expressed in terms of the sub-channel transfer functions. We apply this result to study the identifiability of bandlimited channels from their (estimated) second order statistics (SOS). We prove, and verify through examples, that SOS base...

The problem of blind demodulation of multiuser information symbols in a high-rate code-division multiple-access (CDMA) network in the presence of both multiple-access interference (MAI) and intersymbol interference (ISI) is considered. The dispersive CDMA channel is first cast into a multipleinput multiple-output (MIMO) signal model framework. By applying the theory of blind MIMO channel identi...

Even though broadband signaling and reception is often employed in practice for communication over time-and frequency -dispersive channels, existing receiver designs do not fully exploit the advantage of broadband signaling. We introduce a framework for time-frequency processing that is dictated by a canonical characterization of linear dis-persive channels and fully utilizes the advantage of b...

Time variations of the mobile radio channel cause InterCarrier Interference (ICI) to Orthogonal Frequency Division Multiplexing (OFDM) and Multi-Carrier CDMA (MCCDMA) radio links. This paper evaluates the effect of Doppler and delay spreads on the performance of an MC-CDMA receiver. An MMSE receiver is analyzed for MC-CDMA transmission over a mobile channel with Doppler. A simplified, pseudo MM...

A soft output low complexity maximum likelihood sequence estimation (MLSE) equalizer is proposed to equalize M-QAM signals in systems with extremely long memory. The computational complexity of the proposed equalizer is quadratic in the data block length and approximately independent of the channel memory length, due to high parallelism of its underlying Hopfield neural network structure. The s...

Spread spectrum techniques have been used for many cellular communication systems, and are being adopted widely for military communication networks. The motivation for employing this technique is its ability to suppress fading due to multipath propagation. In this paper, receivers based on chip level equalization are considered for a downlink code division multiple access (CDMA) system employin...

A particular property of the matched desired impulse response receiver is introduced in this paper, namely, the fact that full exploitation of the diversity is obtained with multiple beamformers when the channel is spatially and timely dispersive. This particularity makes the receiver specially suitable for mobile and underwater communications. The new structure provides better performance than...

The problem addressed in this thesis is how to perform symbol synchronization in the presence of channel dispersion. The motivation for this work was to design a synchronization system suitable for an ATSC terrestrial digital television receiver. While such receivers present some specific challenges, the work here is generally applicable to digital receivers working in the presence of dispersiv...

We theoretically investigate the dynamics, bifurcation structure and stability of quadratic dark localized dissipative states arising in cavity enhanced second-harmonic generation. These states, formed through locking plane front waves, undergo collapsed homoclinic snaking may exhibit oscillatory dynamics.