A novel structure that encodes and decodes very high speed unipolar Code Division Multiple Access (CDMA) signals is proposed. This scheme is based on the analogy between the distributed amplifier and the transversal filter. By adjusting the gain of each tap and the delay between taps, the proposed device acts as a high-speed encoder (transmitter) or correlator (receiver). The theoretical analys...

A novel technique for a self-equalized distributed amplifier is presented by showing the analogy between transversal filters and distributed amplifier topologies. The appropriate delay and gain coefficients of amplifier circuit are obtained by a Fourier expansion of the raised cosine spectrum in the frequency range of 0-40GHz.

We demonstrate an automatic tunable transversal notch filter based on uniform fiber Bragg gratings and a broadband optical source. High tunability can be performed by stretching the fiber with the gratings written in series. Also, high sidelobe supression can be achieved by introducing tunable attenuators in a parallel configuration of the gratings.

A general estimation model is defined in which two observations are available; one being a noisy v e ~ i o n of the transmitted signal, while the other is a noisy filtered and delayed version of the same transmitted signal. Examples of such systems occur in noise or echo cancellation, digital communication or geophysical exploration. The delay and the filter are unknown quantities that must be ...

A general estimation model is defined in which two observations are available; one being a noisy version of the transmitted signal, while the other is a noisy-filtered and delayed version of the same transmitted signal. The delay and the filter are unknown quantities that must be estimated. An adaptive system, based on the least squares (LS) estimation criterion, is proposed in order to perform...

An Mth-order adaptive lattice filter automatically generates all M of the outputs that would be provided by M separate transversal filters. This feature can effectively suppress the narrow-band interference (NBI) of time-varying bandwidth in direct-sequence (DS) spread-spectrum systems for which the order of the interference rejection filter that achieves the optimal performance is unknown and ...

A n~ultistep transmultiplexer approach with a single-way modulation scheme applying minimum phase wave digital directional or transversal filters is proposed. Furthermore, the impact of signaling, pilots, and spectral shaping at the PCM end is investigated. The results of a filter design based on wave digital filters is given. The main merits of this approach are, at a moderate level of computa...