Inner Constellation Points for Power Saving Idle Data Transmission
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Solution Overview
Problem
In modern digital subscriber line (DSL) communication systems, the transmission of idle data units (IDTUs) consumes significant power due to the need to maintain a constant physical media dependent (PMD) transmission rate, especially when user data rates are low, leading to inefficient power usage.
Innovation Solution
The method involves generating special data sequences that map to inner constellation points in a multicarrier transmission system, reducing power consumption by transmitting these points instead of outer constellation points, which are more power-intensive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If idle cells are transmitted to maintain constant PMD transmission rate, then transmission rate stability is improved, but power consumption increases
Solution Approach 1:
The patent changes the parameter of constellation points from outer to inner points, which reduces the amplitude and power consumption while maintaining the constant transmission rate. By selecting inner constellation points with lower amplitude, the system achieves power savings without compromising transmission rate stability.
2Stability of the object's composition
If many idle cells are inserted into DTU when user data rate is low, then transmission rate constancy is maintained, but power is wasted on transmitting idle cells
Solution Approach 1:
The patent applies parameter changes by selecting inner constellation points with lower amplitude for idle cells. This reduces the energy required to transmit idle cells while maintaining the constant transmission rate, directly addressing the power waste problem.
3Productivity
If outer constellation points are transmitted, then data transmission capability is maintained, but power consumption is high
Solution Approach 1:
The patent changes the parameter of constellation point selection from outer to inner points. Inner constellation points have lower amplitude and require less power to transmit, while still maintaining adequate data transmission capability through the multicarrier modulation system.
Data Source
AI summary
A method implemented in a multicarrier transmission system, the method comprising generating a plurality of constellation points by using one or more constellation mappers to map a plurality of special data sequences for an idle data transmission unit (IDTU), wherein the plurality of special data sequences are computed prior to the mapping such that the plurality of constellation points are essentially inner constellation points, wherein each of the inner constellation points resides in a constellation diagram that corresponds to one of a plurality of subcarriers used by the IDTU, and wherein the constellation diagram comprises a number of inner constellation points and a number of outer constellation points, with the inner constellation points being closer from an origin of the constellation diagram than the outer constellation points, and transmitting the plurality of constellation points.