MIMO Reference Signal Cyclic Pattern Mapping
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Solution Overview
Problem
Conventional wireless communication systems using Multiple-Input and Multiple-Output (MIMO) face inefficiencies in resource usage and channel estimation due to the increased number of antennas, leading to decreased resource efficiency and channel estimation precision.
Innovation Solution
The method involves determining the number of Reference Signal (RS) transmissions to multiple antennas, creating cyclic transmit patterns, and mapping RSs to antennas according to these patterns for efficient transmission and reception, allowing for precise channel estimation by using the received patterns to estimate channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas is increased to increase data transmission speed and system capacity, then the data transmission speed and system capacity are improved, but the amount of resources required for channel estimation increases proportionally, leading to decreased resource efficiency
Solution Approach 1:
The patent segments the channel estimation process by introducing different types of reference signals (CSI-RS for channel quality indication and CSI for channel state information) that can be transmitted selectively based on system requirements. This segmentation allows the system to estimate channels using only the necessary reference signals rather than requiring full orthogonality for all antennas simultaneously, thereby reducing the total resource consumption for channel estimation while maintaining accurate channel knowledge for high-speed data transmission.
Solution Approach 2:
The patent applies partial action by transmitting reference signals only when and where needed for channel estimation. Instead of maintaining full orthogonality across all antennas at all times, the system transmits reference signals selectively based on channel conditions and system requirements. This partial transmission approach reduces resource consumption while still providing sufficient channel information to support high data transmission speeds through MIMO techniques.
2Measurement precision
If CSI-RS are designed with orthogonality by antennas to achieve precise channel estimation, then the channel estimation precision is improved, but the amount of resources to transmit CSI-RS increases in proportion to the number of antennas, decreasing resource use efficiency
Solution Approach 1:
The patent divides the channel estimation function into two separate reference signal types: CSI-RS for channel quality indication and CSI for channel state information. Each type serves a specific estimation purpose and can be configured independently. This segmentation allows the system to achieve precise channel estimation for each function without requiring full orthogonality across all antennas for both signal types simultaneously, thereby reducing total resource consumption while maintaining estimation precision.
Solution Approach 2:
The patent makes reference signals multi-functional by designing CSI-RS and CSI to serve different but complementary channel estimation purposes. CSI-RS provides broad channel quality information while CSI provides detailed channel state information. This multi-functionality allows the system to achieve comprehensive channel knowledge with reduced resource overhead compared to using a single orthogonal reference signal for all estimation purposes across all antennas.
Data Source
AI summary
An apparatus and method is proved that transmits and receives Reference Signals (RSs) in a wireless communication system using Multiple-Input and Multiple-Output (MIMO). A system adapted to the method is provided. The method includes: determining the number of RS transmission to two or more antennas, respectively, as the number of antennas included in respective ports, wherein each port include one or more antennas; creating transmit patterns so that they cyclically differ from each other every the number of RS transmission to transmit the created transmit patterns the number of RS transmission times; and mapping the RSs to one or more antennas according to the created, respective patterns, and transmitting the RSs in order.