Precoded Reference Signal Allocation for MIMO Channel Estimation
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Solution Overview
Problem
Current wireless communication systems with multiple antennas face challenges in efficiently transmitting reference signals and flexibly controlling their patterns, particularly in supporting Single-User MIMO (SU-MIMO) and Multi-User MIMO (MU-MIMO) due to limitations in channel estimation and resource allocation.
Innovation Solution
A method involving sharing control information related to reference signal precoding between the transmitting and receiving ends, allowing for flexible allocation of precoded reference signals based on communication conditions, including density, frequency interval, and radio resource management, to efficiently support SU-MIMO and MU-MIMO.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are transmitted through multiple antennas in conventional wireless communication systems, then channel estimation capability is improved, but the complexity of signal transmission and resource allocation increases
Solution Approach 1:
The patent segments the reference signal transmission by dividing the set of antennas into two groups: a first set of antennas that transmit first reference signals and a second set of antennas that transmit second reference signals. This segmentation allows the base station to manage multiple reference signals systematically, reducing the complexity of transmitting reference signals across all antennas while maintaining accurate channel estimation for each antenna group.
Solution Approach 2:
The patent applies preliminary action by having the base station transmit the first reference signals through the first set of antennas before transmitting the second reference signals through the second set of antennas. This time-ordered transmission sequence allows the user equipment to process and estimate channel characteristics for each antenna group sequentially, simplifying the overall signal transmission complexity while preserving channel estimation accuracy.
2Adaptability or versatility
If reference signal patterns are made flexible to support SU-MIMO and MU-MIMO, then system adaptability is improved, but control information sharing and resource allocation become more complex
Solution Approach 1:
The patent implements dynamics by enabling the base station to dynamically select which antennas belong to the first set and which belong to the second set, depending on the specific MIMO mode (SU-MIMO or MU-MIMO) and channel conditions. This dynamic antenna set configuration allows the system to adapt to different communication scenarios while using a standardized reference signal transmission framework, thereby improving system adaptability without proportionally increasing control complexity.
Solution Approach 2:
The patent applies universality by designing a reference signal transmission method that can serve multiple functions: it supports both SU-MIMO and MU-MIMO modes, works with single-antenna and multi-antenna configurations, and provides channel estimation for various MIMO scenarios. This universal approach allows a single set of reference signals to serve multiple purposes, improving system versatility while avoiding the need for separate complex reference signal schemes for each MIMO mode.
Data Source
AI summary
A method of transmitting signals by a transmitting end in a wireless communication system comprises sharing control information related to reference signal with a receiving end; generating one or more precoded reference signals considering a given rank; allocating the one or more precoded reference signals to have a specific pattern within a subframe, wherein the specific pattern is varied depending on the control information; and transmitting the subframe through multiple antennas to the receiving end.