Precoding for Wireless Signals Using Composite Channel Derivation
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Solution Overview
Problem
In wireless communication systems employing coordinated multipoint transmissions, the exhaustive search for a suitable precoding scheme by mobile units is time and resource intensive, especially when determining codewords for multiple transmission points.
Innovation Solution
A system comprising a derivation module to determine precoding information for a composite channel representing multiple wireless paths between receiving and transmitting antennas, and a selection module to select a codeword from a subset of predefined codewords based on this information, reducing the time and resources required for codeword selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the mobile unit performs an exhaustive search of predefined codewords to determine precoding schemes for multiple transmission points, then the precision of precoding selection is improved, but the time and computational resources required increase significantly
Solution Approach 1:
The patent segments the precoding determination process into two parts: (1) deriving precoding information for a composite channel representing all transmission points, and (2) selecting individual codewords for each transmission point based on this composite information. This segmentation avoids the need for exhaustive search across all possible codeword combinations for multiple transmission points, significantly reducing computational time while maintaining precoding accuracy.
Solution Approach 2:
The patent performs preliminary derivation of precoding information for the composite channel before selecting specific codewords for individual transmission points. This preliminary action provides a foundation that guides the subsequent codeword selection process, eliminating the need for time-consuming exhaustive searches and enabling faster determination of appropriate precoding schemes.
2Adaptability or versatility
If the mobile unit determines codewords for each transmission point independently through exhaustive search, then the adaptability of precoding to each transmission point is improved, but the computational complexity increases
Solution Approach 1:
The patent separates the complex task of determining precoding for multiple transmission points into manageable segments: first deriving composite precoding information, then selecting codewords for each transmission point based on this composite information. This segmentation reduces computational complexity while maintaining the ability to adapt precoding to each transmission point's specific characteristics.
Solution Approach 2:
The patent introduces composite channel precoding information as an intermediary that mediates between the multiple transmission points and the final codeword selection. This intermediary provides a unified basis for selecting adaptively optimized codewords for each transmission point without requiring independent exhaustive searches, thereby reducing computational complexity.
3Ease of manufacture
If the system uses predefined codewords for precoding, then the ease of implementation is improved, but the precision of signal compensation decreases
Solution Approach 1:
The patent performs preliminary derivation of precoding information based on the actual composite channel conditions before selecting from predefined codewords. This preliminary action ensures that the selected predefined codeword is optimally matched to the current channel state, maintaining high signal compensation precision while utilizing the implementation simplicity of predefined codewords.
Solution Approach 2:
The patent changes the approach from selecting predefined codewords independently for each transmission point to selecting them based on derived precoding information from the composite channel. This parameter change in the selection criterion maintains ease of implementation using predefined codewords while improving signal compensation precision through informed selection.
Data Source
AI summary
A system for determining precoding for a wireless signal may include a derivation module and a selection module. The derivation module may be configured to determine precoding information for a composite channel. The composite channel may represent characterizations of multiple wireless paths established between multiple receiving antennas and multiple transmitting antennas. The transmitting antennas may be distributed among multiple transmission points. The selection module may further be configured to select a codeword for each transmission point from a subset of predefined codewords based on the precoding information. The codeword for each transmission point may be used to manipulate data signals sent over the wireless paths established between the receiving antennas and the transmitting antennas of the respective transmission point.