Block Diagonal Precoding Matrix for MIMO Interference Reduction
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Solution Overview
Problem
Existing MIMO systems face interference issues due to the assumption of independent data streams, leading to suboptimal performance in channel capacity and reliability, especially in dynamic transmission channels.
Innovation Solution
The method involves grouping sending antennas and applying spatial pre-encoding using a block diagonal pre-encoding matrix, allowing transmission on eigen modes of sub-channels, which decorrelates the transmission channel and reduces interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If independent data streams are transmitted per sending antenna, then the system is simple to implement, but interference occurs between data streams and channel capacity is reduced
Solution Approach 1:
The patent segments the transmission system by grouping sending antennas into multiple groups, with each group transmitting independent data streams through spatial pre-encoding. This segmentation allows the system to maintain simplicity within each group while eliminating interference between groups, thereby resolving the contradiction between ease of operation and channel capacity.
Solution Approach 2:
The patent introduces spatial pre-encoding as an intermediary mechanism that processes data streams before transmission. This pre-encoding transforms the data streams into orthogonal signals for each antenna group, acting as a mediator that eliminates interference while maintaining implementation simplicity.
2Reliability
If link adaptation is implemented with feedback, then bit-rate and reliability are improved, but system complexity increases
Solution Approach 1:
The patent applies partial link adaptation by implementing feedback mechanisms only for essential parameters rather than all possible transmission conditions. This partial action approach maintains improved reliability and bit-rate while reducing the complexity of the feedback system, resolving the contradiction between performance improvement and complexity reduction.
3Ease of manufacture
If discrete rate values are used, then implementation is simplified, but quantification noise increases and capacity deteriorates
Solution Approach 1:
The patent changes the parameter representation by using discrete rate values combined with spatial pre-encoding. This parameter transformation allows the system to maintain implementation simplicity while the pre-encoding process compensates for quantification noise, thereby resolving the contradiction between ease of manufacture and information loss.
Data Source
AI summary
A method and apparatus are provided for emitting and receiving a signal in a multi-antennae system, using spatial precoding. A method for emitting a signal from an emitter towards a receiver via a transmission channel, in the form of a set of data flows, includes distributing the emission antennae into a plurality of groups containing at least one antenna, at least one group containing two antennae, according to at least one piece of information representing the transmission channel. The method also includes: attributing an efficiency to each emission antenna; allocating an emission power to each data flow; and spatial precoding the signal, using a matrix for diagonal precoding by blocks, containing at least two blocks, each block being associated with one of the groups of antennae.