MIMO Antenna Resource Index Allocation for Orthogonal Uplink Transmission
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Solution Overview
Problem
The combination of MIMO techniques with CDM or FDM schemes in wireless communication systems leads to broken orthogonality, making it difficult for base stations to distinguish uplink information from multiple users, thereby degrading system performance.
Innovation Solution
A method and apparatus that utilize different resource indices for each transmit antenna to maintain orthogonality, allowing for simultaneous information transmission through multiple antennas while ensuring compatibility with existing LTE systems, employing cyclic shift indices and resource block allocations to achieve orthogonal space resource transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO technique is combined with CDM or FDM schemes for information transmission, then data transmission rate is improved, but orthogonality is broken making it difficult to distinguish uplink information from multiple users
Solution Approach 1:
The patent segments the transmission resources by allocating different resource indices to different transmit antennas. Each antenna transmits using a specific resource index (combining cyclic shift and orthogonal sequence), which divides the transmission space into orthogonal segments. This segmentation maintains orthogonality between antennas while enabling MIMO transmission, resolving the contradiction between improved data rate and maintained orthogonality.
2Productivity
If multiple UEs transmit uplink information using the same time-frequency resource with CDM, then resource utilization is improved, but orthogonality is broken when combined with MIMO
Solution Approach 1:
The patent introduces a new dimension for orthogonality by using resource index allocation across transmit antennas. Instead of relying solely on traditional CDM orthogonality in the code domain, the invention adds antenna-specific resource indexing that creates orthogonality in the spatial-resource domain. This dimensional extension allows multiple UEs to maintain orthogonality even when combined with MIMO, preserving reliability while improving resource utilization.
Data Source
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AI summary
A method and an apparatus of transmitting information in a wireless communication system are provided. The method includes transmitting information based on a first resource index through a first antenna and transmitting the information based on a second resource index through a second antenna.