MIMO Interference Vector Indicator Mapping Table Optimization
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Solution Overview
Problem
In MIMO communication systems, the existing feedforward process for precoding vector indicators and interference vector indicators increases overhead, leading to a desire for a more efficient method to effectively transmit and receive these indicators with reduced overhead.
Innovation Solution
A communication method where a base station generates and adapts a mapping table based on the probability of vectors being included in the precoding matrix, using the similarity between vectors and interference vectors to optimize the representation of interference vector indicators, thereby reducing the number of bits required for indicator transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the base station feeds forward both precoding vector indicator and interference vector indicator, then the terminal can accurately recognize precoding vectors, but the overhead increases
Solution Approach 1:
The patent extracts only the necessary information by feeding forward only the interference vector indicator rather than both precoding and interference vector indicators. The terminal uses the codebook and mapping table to derive the precoding vector information from the interference vector indicator, thereby eliminating redundant information transmission while maintaining accurate precoding vector recognition.
Solution Approach 2:
The patent introduces a mapping table as an intermediary structure that enables the terminal to convert the interference vector indicator into the corresponding precoding vector information. This mapping table acts as a mediator between the base station and terminal, allowing efficient information derivation without direct transmission of all necessary data.
2Ease of manufacture
If the base station uses a fixed mapping table for interference vector indicators, then the implementation is simple, but the overhead cannot be optimized for different communication conditions
Solution Approach 1:
The patent makes the mapping table dynamic by allowing the base station to select different mapping table modes (first mapping table mode or second mapping table mode) based on communication conditions. The base station determines which mode to use by considering factors such as the number of active users and channel conditions, thereby optimizing overhead efficiency while maintaining implementation simplicity through automated mode selection.
Data Source
AI summary
Provided are a base station configured to provide an interference vector indicator to a terminal, and the terminal configured to recognize at least one remaining precoding vector using the interference vector indicator. Each of the base station and the terminal may configure a mapping table between at least one bit for the interference vector indicator indicating the at least one remaining precoding vector, and a plurality of vectors included in a codebook, based on a probability that the plurality of vectors may be included in a precoding matrix. In this instance, the base station may generate the interference vector indicator using the mapping table, and the terminal may recognize the at least one remaining precoding vector using the mapping table. The mapping table may be differently configured according to various modes.