Digital Demodulator Power Management via Dynamic Clock and Bit Width Adjustment

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Solution Overview

Problem

Existing digital demodulator chips for DVB-H receivers consume excessive power, limiting battery life in handheld devices, as they are designed for worst-case operating conditions that occur only 10% of the time, leading to unnecessary power consumption during the remaining 90% of operation.

Innovation Solution

Dynamic power management is implemented by varying clock rates and bit widths of demodulator components based on signal parameters such as modulation mode, signal-to-noise ratio, and interference levels, allowing for optimized power consumption without compromising performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the digital demodulator chip is designed for worst-case operating conditions, then the device can handle all possible signal conditions reliably, but the power consumption increases unnecessarily during normal operation

Engineering Contradiction:
Improvesignal processing reliabilityVSAvoidpower consumption
Core Design Contradiction:
ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic power management by making the demodulator components adjustable and reconfigurable based on real-time signal conditions. The system dynamically changes operating parameters such as clock rates and bit widths of ADCs according to the actual signal-to-noise ratio and interference levels, rather than being fixed for worst-case conditions. This allows the device to adapt its processing power to match actual operational needs, maintaining reliability when required while reducing power consumption during normal operation.

Inventive Principle:
Principle #15Dynamics

2Use of energy by moving object

If the clock rate and bit width are reduced to lower power consumption, then power efficiency improves, but the device cannot handle worst-case signal conditions

Engineering Contradiction:
Improvepower consumptionVSAvoidsignal processing capability
Core Design Contradiction:
Use of energy by moving objectVSReliability

Solution Approach 1:

The patent changes the operating parameters of the demodulator components based on the measured signal characteristics. Specifically, the system monitors signal-to-noise ratio, interference levels, and error rates, then adjusts parameters such as ADC clock rates and bit widths accordingly. When signal conditions are good, parameters are reduced to minimize power consumption. When signal conditions deteriorate toward worst-case scenarios, parameters are increased to maintain processing capability and reliability, thus resolving the contradiction between power efficiency and signal handling capability.

Inventive Principle:
Principle #35Parameter changes

3Reliability

If fixed high-performance components are used, then the device maintains consistent performance across all conditions, but battery life in handheld devices is limited

Engineering Contradiction:
Improveperformance consistencyVSAvoidbattery life
Core Design Contradiction:
ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent transforms the static, fixed-performance architecture into a dynamic system that adjusts its performance characteristics in real-time. By continuously monitoring signal conditions and adapting the operating parameters of demodulator components, the system maintains consistent performance quality across varying signal conditions while significantly extending battery life. The dynamic adjustment ensures that high-performance processing is only activated when actually needed, rather than running at maximum capacity continuously.

Inventive Principle:
Principle #15Dynamics

Data Source

PatentUS7555661B2Power management in digital receivers that adjusts at least one a of clock rate and a bit width based on received signal
Publication Date: 2009.06.30 QUALCOMM INC
  • US7555661B2 patent drawing
  • US7555661B2 patent drawing
  • US7555661B2 patent drawing

AI summary

Methods and systems consistent with the present invention provide a method for dynamically controlling power consumption in a digital demodulator circuit by varying clock rates and bit widths of demodulator components including an analog to digital converter, decimation filter, OFDM operating engine, FEC decoder, and MPE-FEC processor, according to parameters and conditions of the received signal including modulation mode, signal to noise ratio, effective bit transmission rate, bit error rate, packet error rate, adjacent channel interference, and co-channel interference.