Polar noise shaping
AssigneeNokia Technologies Oy
InventorTommi Ylamurto
Life of this patent
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Abstract
Methods and apparatus, including computer program products, are provided for polar noise shaping. In one aspect there is provided a method. The method may include receiving a first error signal representative of a first noise including a first quantization noise carried by a quadrature signal; receiving a second error signal representative of a second noise including a second quantization noise carried by an in-phase signal; and determining one or more bits in a polar domain, wherein the one or more bits cancel a portion of the first noise and the second noise represented by the first error signal and the second error signal. Related apparatus, systems, methods, and articles are also described.
Claims17
A method comprising:
- receiving a first error signal representative of a first noise including a first quantization noise carried by a quadrature signal;
- receiving a second error signal representative of a second noise including a second quantization noise carried by an in-phase signal;
- determining one or more least significant bits that cancel at least a portion of the first noise and the second noise represented by the first error signal and the second error signal, wherein the one or more least significant bits are determined, by at least two parallel sigma delta modulators, from at least the first error signal and the second error signal, wherein the two parallel sigma delta modulators determine, in a rectangular domain, an amount needed to cancel the first noise and the second noise, and convert, into a polar domain, the amount to the one or more least significant bits;
- and
- combining, in the polar domain, the one or more least significant bits with an amplitude signal and a phase signal to cancel the portion of the first noise and the second noise.
An apparatus comprising:
- at least one processor circuitry;
- and
- at least one memory circuitry including computer program code, the at least one memory circuitry and the computer program code configured to, with the at least one processor circuitry, cause the apparatus configured to perform at least the following:
- receive a first error signal representative of a first noise including a first quantization noise carried by a quadrature signal;
- receive a second error signal representative of a second noise including a second quantization noise carried by an in-phase signal;
- determine one or more least significant bits that cancel at least a portion of the first noise and the second noise represented by the first error signal and the second error signal, wherein the one or more least significant bits are determined, by at least two parallel sigma delta modulators, from at least the first error signal and the second error signal, wherein the two parallel sigma delta modulators determine, in a rectangular domain, an amount needed to cancel the first noise and the second noise, and convert, into a polar domain, the amount to the one or more least significant bits;
- and
- combine, in the polar domain, the one or more least significant bits with an amplitude signal and a phase signal to cancel the portion of the first noise and the second noise.
A non-transitory computer-readable storage medium including computer program code, which when executed by at least one processor circuitry causes operations comprising:
- receiving a first error signal representative of a first noise including a first quantization noise carried by a quadrature signal;
- receiving a second error signal representative of a second noise including a second quantization noise carried by an in-phase signal;
- determining one or more least significant bits that cancel at least a portion of the first noise and the second noise represented by the first error signal and the second error signal, wherein the one or more least significant bits are determined, by at least two parallel sigma delta modulators, from at least the first error signal and the second error signal, wherein the two parallel sigma delta modulators determine, in a rectangular domain, an amount needed to cancel the first noise and the second noise, and convert, into a polar domain, the amount to the one or more least significant bits;
- and
- combining, in the polar domain, the one or more least significant bits with an amplitude signal and a phase signal to cancel the portion of the first noise and the second noise.
Dependencies are inferred from the claim text.