Multi-Antenna Mobile Station Feedback for Spatial Processing
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Solution Overview
Problem
Next-generation mobile communication systems face challenges in minimizing signal fading, interference, and noise due to the increasing number of antennas, which degrades communication performance, especially when channel characteristics and migration speeds of mobile stations vary, and existing feedback schemes are inefficient for multiple antennas.
Innovation Solution
A mobile communication apparatus and method that involves a base station and mobile station with multiple transmission and reception antennas, where long-term and short-term information, along with SINR, are fed back to spatially process dedicated physical channel signals, and downlink power control information is used to optimize channel characteristics, effectively reducing interference and noise while maximizing data throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of antennas is increased to minimize fading and improve diversity effect, then signal-to-noise ratio and diversity effect are improved, but device complexity and cost increase
Solution Approach 1:
The patent segments the channel information feedback into two distinct parts: long-term channel information (correlation matrix) and short-term channel information (instantaneous channel state). This segmentation allows the system to use multiple antennas effectively while reducing feedback overhead by only transmitting essential channel characteristics rather than complete channel state information for each antenna.
Solution Approach 2:
The patent changes the parameter representation from traditional channel state information to eigenvalues and eigenvectors of the channel correlation matrix. This parameter transformation compresses the channel information into a more efficient form that captures the essential spatial characteristics of the multi-antenna channel, reducing complexity while maintaining reliability.
2Object-affected harmful factors
If the number of antennas is increased to reduce interference signals, then interference minimization is improved, but device complexity and space utilization deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where the mobile station measures the downlink channel and feeds back eigenvalues and eigenvectors to the base station. This feedback enables the base station to adapt its transmission strategy using multiple antennas to minimize interference signals while maintaining manageable device complexity through efficient information representation.
3Device complexity
If traditional feedback schemes are used for multiple antennas, then implementation is simpler, but feedback efficiency and adaptability to channel variations deteriorate
Solution Approach 1:
The patent introduces dynamic adaptability by separately handling long-term and short-term channel variations. The long-term correlation matrix captures slow-varying spatial characteristics, while the short-term channel state captures fast fading variations. This dynamic approach allows the system to adapt to varying channel conditions efficiently without excessive feedback overhead.
Solution Approach 2:
The patent transforms the feedback parameters from traditional channel state information to eigenvalues and eigenvectors, which dynamically adapt to channel conditions. This parameter change enables the system to efficiently represent both long-term spatial correlations and short-term fading variations, improving adaptability while maintaining feedback efficiency.
Data Source
AI summary
A mobile communication apparatus with multiple transmission and reception antennas and a mobile communication method therefor are provided. In the mobile communication apparatus including a base station and a mobile station, the base station with at least one transmission antenna restores long-term information, short-term information, a signal to interference and noise ratio (SINR) from a feedback signal received from the mobile station, spatially processes dedicated physical channel (DPCH) signals using basis information generated from the restored long-term information, short-term information, and SINR, and transmits the results of adding pilot channel (PICH) signals to the spatially processed results to the mobile station. The mobile station with at least one reception antenna determines a first characteristic corresponding to the channel downlink characteristic for each of the transmission and reception antennas, from the PICH signals transmitted from the base station, determines the long-term information, the short-term information, and downlink power control information including the SINR, which reflect the first characteristic, converts the determined long-term information, short-term information, and downlink power control information into the feedback signal, and transmits the feedback signal to the base station.