This paper provides a tutorial overview of multichannel wireless digital receivers and the relationships between channel bandwidth, channel separation, and channel sample rate. The overview makes liberal use of figures to support the underlying mathematics. A multichannel digital receiver simultaneously down-convert a set of frequency-division-multiplexed (FDM) channels residing in a single sam...

Subband blind source separation methods have been recently proposed with the objective of reducing the computational complexity and improving the convergence rate of online adaptive algorithms. Oversampled subband structures, employing uniform DFT filter banks, are usually employed in order to avoid aliasing effects and keep enough samples to estimate the statistics of the subband signals. In t...

We present a discrete-time mathematical formulation for applying recursive digital filters to non-uniformly sampled signals. Our solution presents several desirable features: it preserves the stability of the original filters; is well-conditioned for low-pass, high-pass, and band-pass filters alike; its cost is linear in the number of samples and is not affected by the size of the filter suppor...

A solution of the discrete H ∞ smoothing problem is presented that lends itself well for generalization to sampled-data problems. The solution is complete and requires two sign-definite spectral factoriza-tions and one Nehari extension problem. A state-space equivalent is derived that is believed to be minimal. w e y v u H G v G y S-(a) w e y v u K G v G y-(b) FIG. 1.1. (a) Hold design. (b) Dis...