VDSL Transmission Apparatus Power Reduction via Frequency Band Switching
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Solution Overview
Problem
VDSL systems face high power consumption in digital parts due to higher data rates and lesser output power compared to ADSL systems, with existing energy-saving methods only reducing analog part power consumption.
Innovation Solution
A method and apparatus that switch between multiple frequency bands based on data quantity, reducing the number of frequency bands and repeating data symbols to lower power consumption, with inverse and forward Fourier transformations optimized to reduce computational load in digital parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the number of frequency bands is reduced to lower transmission power, then power consumption in analog parts is reduced, but power consumption in digital parts remains high due to repeated Fourier transformations
Solution Approach 1:
The patent applies preliminary action by performing the Fourier transformation only once before symbol repetition, and then reusing the transformed signal for multiple repetitions without performing the transformation again. This pre-computation approach eliminates redundant calculations in the digital processing chain, significantly reducing power consumption in digital parts while maintaining the power-saving benefits of reduced frequency bands.
2Reliability
If data symbols are transmitted repeatedly to average out noise, then signal quality is improved, but transmission time is increased
Solution Approach 1:
The patent implements periodic action through symbol repetition, where data symbols are transmitted multiple times in a periodic manner. This allows the receiver to average out noise and improve signal quality through coherent integration of repeated symbols. The periodic repetition structure enables reliable signal recovery while managing transmission time efficiently.
3Power
If the number of frequency bands is reduced by a factor N, then transmission power is reduced, but the number of Fourier transformation operations increases
Solution Approach 1:
The patent applies merging by combining multiple frequency bands into fewer bands, reducing the overall number of transformations needed. By consolidating the frequency domain representation, the system performs fewer inverse Fourier transformations at the transmitter and fewer forward Fourier transformations at the receiver, thereby reducing computational load despite the reduced number of active frequency bands.
Data Source
AI summary
A method and an apparatus for the transmission of data is provided, wherein the data, in a first operating mode, are transmitted in a plurality of first frequency bands and, in a second operating mode, are transmitted in a plurality of second frequency bands. A number of the first frequency bands is in this case greater than a number of the second frequency bands. The first operating mode is used if there is a large quantity of data to be transmitted. If only a small quantity of data is to be transmitted, switchover to the second operating mode is effected, whereby a power saving can be achieved, particularly in digital parts of a transmitting device and of a receiving device.