Patent ID: 6359937
Filing Date: 2002-03-19
Classification: H04B,H04L

Abstract:
An apparatus for transmitting signals over a wireless network in an analog mode, the apparatus comprising:first logic, the first logic receiving digital signals representing the signals to be transmitted over the wireless network, the first logic being configured to generate digital in-phase (I) and quadrature (Q) values representing said digital signals; second logic in communication with the first logic, the second logic being configured to convert the digital I and Q values into analog I and Q values; and third logic in communication with the second logic, the third logic being configured to convert the analog I and Q values into two cosine waves that are substantially 90Â° out of phase from each other, the third logic being configured to sum the cosine waves for transmission over the wireless network, wherein the digital I and Q values represent I and Q values on a unit circle obtained from an equation: I(n)=cos(p(n)), and Q(n)=cos(p(n)âˆ’90 degrees), where n is a sample index that is incremented at a particular sample rate, p(n) is a phase of a current sample of said digital signals received by said first logic, and p(nâˆ’1) is a phase of an immediately preceding sample of said digital signals received by said first logic, and wherein a relationship between an amplitude of the current sample and the phase p(n) of the current sample can be expressed by an equation:p(n)=p(nâˆ’1)+k*a(n), where a(n) is the amplitude of the current sample and k is a scaling constant selected to obtain a desired relationship between a(n) and a peak frequency deviation of the summed cosine waves.