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A novel and improved method and apparatus for controlling signal power level in a communication system (100) is provided by determining first and second signal to interference ratios of a received signal, respectively before and after an interference cancellation, determining a difference between th

A novel and improved method and apparatus for controlling signal power level in a communication system (100) is provided by determining first and second signal to interference ratios of a received signal, respectively before and after an interference cancellation, determining a difference between the first and second signal to interference ratios, and determining, based on the difference, a signal to interference threshold for controlling power level of a signal transmitted from a source of the received signal.

대표청구항 ▼

A novel and improved method and apparatus for controlling signal power level in a communication system (100) is provided by determining first and second signal to interference ratios of a received signal, respectively before and after an interference cancellation, determining a difference between th

A novel and improved method and apparatus for controlling signal power level in a communication system (100) is provided by determining first and second signal to interference ratios of a received signal, respectively before and after an interference cancellation, determining a difference between the first and second signal to interference ratios, and determining, based on the difference, a signal to interference threshold for controlling power level of a signal transmitted from a source of the received signal. SUB>Wis a focal length of the entire zoom optical system in the wide-angle end position. 2. A zoom optical system comprising a lens system, said lens system consisting of, in order from an object side: a first lens unit having a positive refracting power; and a second lens unit having a negative refracting power, in variable magnification change from a wide-angle end position through a telephoto end position, each of said first lens unit and said second lens unit being moved toward the object side in such a manner that a space between said first lens unit and said second lens unit decreases, wherein said first lens unit consists of, in order from the object side, a first lens component having a positive refracting power, a second lens component having a negative refracting power, and a third lens component having a positive refracting power, said third lens component consisting of one cemented-lens component, wherein said second lens unit comprises at least one positive lens element and two negative lens elements, one of said negative lens elements being a negative meniscus lens that is disposed on a most image side with a convex surface thereof being directed toward an image side, and wherein the following conditions are satisfied: LT/fTL23 where LTis a total length of the entire zoom optical system in the telephoto end position, fTis a focal length of the entire zoom optical system in the telephoto end position, and NL23is a refractive index of said negative lens element disposed on the most image side in said second lens unit. 3. A zoom optical system comprising a lens system, said lens system consisting of, in order from an object side: a first lens unit having a positive refracting power; and a second lens unit having a negative refracting power, in variable magnification change from a wide-angle end position through a telephoto end position, each of said first lens unit and said second lens unit being moved toward the object side in such a manner that a space between said first lens unit and said second lens unit decreases, wherein said first lens unit consists of, in order from the object side, a first lens component having a positive refracting power, a second lens component having a negative refracting power, and a third lens component having a positive refracting power, said third lens component having at least one negative lens element, and wherein said second lens unit consists of, in order from the object side, a lens element having a negative refracting power, a lens element having a positive refracting power, and a lens element having a negative refracting power. 4. A zoom optical system comprising a lens system, said lens system consisting of, in order from an object side: a first lens unit having a positive refracting power; and a second lens unit having a negative refracting power, in variable magnification change from a wide-angle end position through a telephoto end position, each of said first lens unit and said second lens unit being moved toward the object side in such a manner that a space between said first lens unit and said second lens unit decreases, wherein said first lens unit consists of, in order from the object side, a first lens component having a positive refracting power, a second lens component having a negative refracting power, and a third lens component having a positive refracting power, said third lens component consisting of one cemented-lens component, and wherein said second lens unit consists of, in order from the object side, a lens element (L21) having a negative refracting power and a lens element (L22) having a negative refracting power, said lens element (L21) having at least one aspherical surface. 5. A zoom optical system comprising a lens system, said lens system consisting of, in order from an object side: a first lens unit having a positive refracting power;