SINR Estimation for HSDPA MIMO Receivers
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Solution Overview
Problem
Conventional SINR estimation methods are inadequate for MIMO implementations in HSDPA systems, particularly due to the use of pre-coded data streams and separate pilot channels, which can lead to inaccurate interference and noise power calculations.
Innovation Solution
A method and apparatus that receive pre-coded data streams from multiple transmitter antennas, process them using equalizer filter coefficients, and calculate signal, interference, and noise powers based on post-equalizer channel coefficients and weighting coefficients, enabling accurate SINR estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional SINR estimation methods are used in MIMO HSDPA systems, then the system can operate with pre-coded data streams and separate pilot channels, but the interference and noise power calculations become inaccurate
Solution Approach 1:
The patent segments the SINR estimation process into distinct components: signal power calculation, interference power calculation, and noise power calculation. Each component is handled separately using appropriate methods (post-equalizer channel coefficients for signal and interference, pilot channels for noise), allowing accurate estimation in MIMO environments while maintaining adaptability to pre-coded data streams
Solution Approach 2:
The patent introduces post-equalizer channel coefficients as an intermediary element that bridges the gap between pre-coded data transmission and accurate SINR estimation. These coefficients serve as a mediator that enables precise measurement of signal and interference powers without being affected by the pre-coding operation, thus resolving the contradiction between MIMO adaptability and measurement precision
2Productivity
If pre-coded data streams are transmitted from multiple antennas, then spectral efficiency and link reliability improve, but conventional SINR estimation methods become inappropriate
Solution Approach 1:
The patent performs preliminary equalization processing to obtain post-equalizer channel coefficients before SINR estimation. This preliminary action prepares the data in a form that is suitable for accurate power calculations, enabling high throughput MIMO operation while maintaining measurement precision through the use of these pre-processed coefficients
3Measurement precision
If separate pilot channels are used for each transmitter antenna, then channel estimation accuracy improves, but noise power calculation becomes challenging with pre-coded data
Solution Approach 1:
The patent extracts noise power calculation from the data stream processing by using separate pilot channels. This extraction allows noise to be measured independently without being contaminated by pre-coded data, maintaining channel estimation accuracy while simplifying the overall SINR calculation by separating noise measurement from signal and interference measurement
Data Source
AI summary
In an example embodiment a method comprises receiving at least one data stream from at least two transmitter antennas, wherein the at least one data stream is pre-coded by a set of weighting coefficients; receiving a pilot channel from each of the at least two transmitter antennas; processing the received at least one data stream by an equalizer with a set of equalizer filter coefficients; calculating for each of the at least one data stream following: a signal power and an interference power from other stream, if there is any intererence, at least in part based on a set of post equalizer channel coefficients and the set of weighting coefficients; a noise power at least in part based on the received pilot channels and the set of weighting coefficients; and a signal to interference and noise ratio based on the corresponding calculated signal power, interference power and noise power.