Wireless Receiver Power Estimation Without Pilot Symbols
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in accurately estimating signal and interference powers without the availability of pilot symbols or a reference channel signal, particularly in systems like 3GPP Release 6 downlink channels, which complicates transmit power control and link quality assessment.
Innovation Solution
A method and apparatus for estimating signal and interference powers in a wireless receiver by measuring the variance of components perpendicular and parallel to the defined direction in the complex plane, allowing for the estimation of interference power, total power, and symbol power, enabling processing and control information generation without relying on pilot symbols or a reference channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pilot symbols are transmitted to enable signal and interference power estimation, then measurement precision is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The received signal itself is used to estimate interference power by measuring variance perpendicular to the symbol direction, eliminating the need for separate pilot symbols. The signal serves its own estimation needs without requiring additional dedicated resources.
Solution Approach 2:
The interference component is extracted from the received signal by measuring the variance of the component perpendicular to the symbol direction in the complex plane. This separates the interference estimation from the need for pilot symbols.
2Quantity of substance
If no pilot symbols are transmitted to save resources, then resource utilization efficiency is improved, but measurement precision deteriorates
Solution Approach 1:
The received signal containing unknown data symbols is used directly for interference power estimation. The signal itself provides the necessary information without requiring external pilot symbols, achieving accurate estimation while saving resources.
Solution Approach 2:
The problem is solved by moving to a different dimension in the complex plane - measuring variance perpendicular to the symbol direction rather than along it. This dimensional transformation allows interference estimation without needing known symbols.
3Reliability
If reference channel signals are used for power control feedback, then reliability is improved, but device complexity increases
Solution Approach 1:
The interference power estimation is extracted directly from the received signal's perpendicular component variance, removing the dependency on reference channel signals and gain factor estimation between control and reference channels.
Solution Approach 2:
The received signal provides all necessary information for power control feedback generation through direct interference power measurement, making the system self-sufficient without requiring separate reference channel infrastructure.
Data Source
AI summary
Wireless receiver and method of operating a wireless receiver in a wireless communication network for: receiving a signal, the received signal comprising data containing at least one symbol from a symbol alphabet, the symbol alphabet consisting of complex values that define a direction in the complex plane, the received signal further comprising interference; measuring the variance of a first component of the received signal that is perpendicular to the defined direction in the complex plane; estimating the interference power of the received signal using the measured variance of the first component of the received signal; estimating a total power of the received signal; estimating the power of the at least one symbol of the received signal by subtracting the estimated interference power from the estimated total power of the received signal; and based on the estimated interference power and the estimated power of the at least one symbol of the received signal, performing at least one of the steps of: processing the received signal, and generating control information related to the transmission of a further signal from the wireless receiver.