Aarno Parssinen

TL;DR: In this article, a method, device, and system that use narrowband channels to provide higher re-use without multiplying the operator spectrum requirement is presented, where the narrow channel capacity can be divided among adjacent cells to provide high reuse.

TL;DR: In this paper, the authors proposed a method for reducing an imbalance in gain between an in-phase channel and a quadrature channel of a radio receiver by employing in at least one of the channels amplifying means with an adjustable gain for amplifying received signals in the analog domain.

TL;DR: In this paper, a biasing technique for cancelling second-order intermodulation (IM2) distortion and enhancing secondorder intercept point (IIP2) in common-source and common-emitter RF transconductors is presented.

TL;DR: In this article, the authors present a system-independent trans-mitter architecture based on a direct-digital RF modulator which combines the D/A conversion, up-conversion, unwanted sideband rejection, power control, and part of the digital image-rejection filtering into a single mixed-signal circuit block.

TL;DR: In this article, a wideband spectrum is searched with a lower resolution to identify bandwidth slices having low or no signal levels and a spectrum detection algorithm is executed on the selected candidate frequency slices in the order of the rank until it is decided that one of them has sufficiently free spectrum.