Loading patent…
AssigneeSaraband Wireless
InventorsPaul Michael Ebert, Donald Stuart Arnstein
Estimating the term…
A test signal generator at a transmitter station and a facsimile generator at a receiver station go through an acquisition and tracking process which aligns the two signals so that a logical processor can compute the frequency transfer function of the entire propagation path for use in an adaptive, concurrently sent communication signal. The frequency transfer function is conveyed back to the transmit end via a control channel permitting an adaptivity function at the transmit end to influence subsequent selection of communication parameters, among which are typically transmitted data rate, selection of modulation, selection of forward error correcting coding, and selection of frequency band for transmission. The same measurement is conveyed to an adaptivity function at the receive end for use in the communications receiver to select demodulator variables such as gain control, and equalization of amplitude and phase, versus frequency. The adaptivity function also permits interspersing of reverse-direction communications over the same frequency bands in a time-share mode between forward-direction and reverse-direction communication with the measurement signals having to be transmitted in only one direction. An alternate embodiment invention of this type is described which is additionally useful for mobile communications channels. Another variation embodiment is described for pure propagation measurements only, absent conveyance of end-user information.
A vector network analyzer which measures amplitude and phase-shift versus frequency of a radio propagation link typical of licensed-band or unlicensed-band wireless communications, said analyzer being used in an applique mode appended to a wireless radio frequency communications link, and comprising:
Said logical processor making a plurality of adjustments to said facsimile signal generator, which processing steps are divisible into two categories:
Interpretive means for adaptively controlling queuing and segmentation of both forward-going and backward-going communications based in part on measurement data in numerical files produced in said logical processor.
Said logical processor for said preferred embodiment test signals which performs the following operations:
A test signal receiver logical processor which operates on the analog-to-digital sampled in-phase and quadrature heterodyned signal when the test signals are chosen to be of the preferred embodiment type, upward-going linear FM sweeps and downward going linear FM sweeps, said particular operations being further illustrated by a preferred embodiment set of processing steps:
An alternative embodiment vector network analyzer which finds amplitude and phase-shift versus frequency of a radio propagation link typical of licensed-band or unlicensed-band wireless communications, said analyzer comprising:
Dependencies are inferred from the claim text.