General phase perturbation method

摘要

A method for modifying a signal transmitted from a mobile communication device comprising perturbing a transmit diversity parameter from its nominal value by modulating the parameter with respect to the nominal value in alternating directions, receiving a feedback signal including feedback information relating to the modified signal as received at a feedback device, and based at least on the feedback information, adjusting the nominal value of the transmit diversity parameter by increasing, decreasing, or preserving the nominal value. The perturbations are selected to minimize phase discontinuities.

主权项

1. A method of modifying a signal transmitted from a modifying communication device in communication with a feedback communication device, said signal being associated with a transmit diversity parameter, the transmit diversity parameter having a nominal value Φnominal, said method comprising the steps of:
perturbing by said modifying communication device the transmit diversity parameter from said nominal value Φnominal at a perturbation rate and transmitting a perturbed signal resulting from the perturbation, said perturbed signal being perturbed over perturbation periods, each perturbation period being divided into 2(N1+N2) steps, said perturbed signal being perturbed by a differential phase ΔΦ for N1 steps and said perturbed signal being perturbed by 0 degrees during N2 steps; receiving, by the modifying communication device, a feedback signal at a feedback rate from the feedback communication device, the feedback signal including feedback information relating to a receipt of the perturbed signal at said feedback communication device, said feedback signal including a sequence of feedback values, each feedback value FBi representing a feedback signal to a phase difference Φi during respective step i of said perturbation period; and based on said feedback signal, adjusting the nominal value Φnominal of said transmit diversity parameter by said ΔΦ, wherein said ΔΦ is a fraction less than one of said nominal value Φnominal and is determined by a scaling function f(s) wherein a and b are predefined ranges for said ΔΦ, Wi are weighed values of the feedback values and said f(s) is defined as:f⁡(s)={ba⁢s,-a≤s≤ab,s>a-b,s<-as=∑i=12⁢(N1+N2)⁢FBi·WiWi=2⁢Φi-ΦnominalΦMAX-ΦMINΦMAX=max⁡(Φi),ΦMIN=min⁡(Φi),i=1,2⁢⁢…⁢⁢2⁢(N1+N2)Φnominal=ΦMAX-ΦMIN2.