Anti-Whitening Data Block for Direction Estimation
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Solution Overview
Problem
Direction estimation in wireless communications systems using single-channel multi-antenna transmitters and receivers is hindered by data whitening, which corrupts received data and complicates signal processing, especially when switching between antennas.
Innovation Solution
Incorporating an anti-whitening mechanism that inserts an anti-whitened data block into the whitening process, allowing the data block to remain in its original form within the whitened data block, thereby preserving specific properties necessary for direction estimation without modifying subsequent processing stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data whitening is applied to randomize data patterns and minimize DC bias, then data transmission quality is improved, but direction estimation capability deteriorates because the whitening process corrupts the received data
Solution Approach 1:
The data block is divided into two distinct parts: a first data block that undergoes whitening treatment to improve transmission quality, and a second data block that remains in its original non-whitened form to preserve direction estimation capabilities. This segmentation allows each part to serve its specific function independently, resolving the contradiction between transmission quality and direction estimation accuracy.
2Ease of operation
If whitening is applied to minimize DC bias and randomize patterns, then signal processing is simplified, but the modulation-dependent characteristics become variable during antenna switching, complicating direction estimation
Solution Approach 1:
The data transmission is segmented into two portions: the first data block is whitened to simplify signal processing and minimize DC bias, while the second data block maintains constant modulation-dependent characteristics by avoiding whitening, thus simplifying direction estimation during antenna switching.
Solution Approach 2:
The second data block acts as an intermediary reference signal that provides stable, non-whitened characteristics during antenna switching. This intermediary allows the system to maintain simple signal processing for direction estimation while the first data block handles the whitening requirements for transmission quality.
3Reliability
If the entire data block is whitened to ensure randomization, then transmission reliability is improved, but the specific properties needed for direction estimation are lost
Solution Approach 1:
The data block is segmented into a first data block that is whitened to ensure transmission reliability and randomization, and a second data block that preserves original properties to maintain direction estimation information. This segmentation prevents the loss of direction estimation information while still achieving transmission reliability through whitening of the first block.
Data Source
AI summary
It is disclosed to insert an anti-whitened data block, which is obtainable from a specific data block by anti-whitening, into a data block that is to be whitened by a whitening to yield a whitened data block, wherein the anti-whitening compensates the whitening so that the whitened data block will comprise the specific data block in non-whitened form. It is further disclosed to output, in a first operating mode, an output data block generated by one of whitening and de-whitening an input data block in its entirety, and outputting, in a second operating mode, one of: an output data block generated by one of whitening and de-whitening all parts of an input data block under exclusion of a specific data block contained in the input data block.