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Receiver-with-adaptive-processing

Apparatus for generating tracking error signals in a differential phase detection system

Accordingly, it is an object of the present invention to provide a tracking servo circuit for an ...

Time slot interchanger and digital communications terminal for ISDN D-channel assembly

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System packet-based centralized base station controller

OF A PREFERRED EMBODIMENT While this invention is susceptible of embodiment in many different ...

System and method for providing efficient signaling for a positioning request and an indication of when a mobile station becomes available for location services

The present invention is directed to telecommunications systems and methods for reducing the ...

Inter-MSC handover in high-speed data transmission

OF THE INVENTION With reference to FIGS. 1 and 2, parallel call set-up can be implemented at least ...

Neighborhood cordless service call handoff

OF PREFERRED EMBODIMENTS Referring to FIG. 1, there is shown an exemplary system architecture for ...

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I claim: 1. A system for communicating received digital signals over a bandwidth limited data link, ...

Program creation apparatus for reactive systems

To achieve the objects mentioned above, the present invention provides a program creation apparatus ...

Time division demultiplexer with independent data distribution

OF THE INVENTION FIG. 2 shows a demultiplexing system constructed in accordance with the invention ...

Laser source

It is therefore a primary object of the present invention to provide a laser source with small ...

Receiver with adaptive processing

Details

Inventors: Prasanna, G. N. Srinivasa;
Assignee: Agere Systems Guardian Corp. (Orlando, FL)
Primary Examiner: Tse; Young T.
Assistant Examiner:
Attorney, Agent or Firm: Mendelsohn; Steve

A receiver for signals generated using a modulation scheme such as quadrature-phase shift-keying (QPSK) modulation. The receiver characterizes the variance in the detected signal constellation and, when appropriate, adjusts at least some part of its processing in order to reduce power consumption or error rate. For example, when the variance is low and full receiver operation is not required to achieve accurate phase detection, one or more of the following changes are made to reduce power consumption: the resolution of the A/D converter is reduced, the precision of digital filtering is reduced, and/or one or more of the digital filters are turned off. If the variance in the detected signal constellation should increase, appropriate changes may be made to gradually restore the operations of the full receiver as needed to reduce error rate. In this way, the receiver can efficiently regulate its power consumption without jeopardizing the accuracy of its signal processing. In one application, the receiver is used in a remote node of a fiber-to-the-curb (FTTC) communication system, where power may be limited.

DETAILED DESCRIPTION The present invention is directed to a scheme for efficiently using power in a receiver designed for QPSK or other modulated signals.
According to one embodiment, the present invention is a receiver for an input signal generated using a modulation scheme, wherein the receiver is adapted to generate a variance of a constellation corresponding to the input signal and to adaptively adjust its processing based on the variance, for example, to reduce power consumption or error rate in the receiver.

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