Cyclic Shift Management for Multiple Antenna Wireless Signals
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Solution Overview
Problem
Current SC-FDMA-based wireless communication systems face challenges in achieving high uplink transfer rates required for next-generation mobile communication systems, particularly due to limitations with single-antenna configurations and the need for effective signal transmission in multiple antenna systems.
Innovation Solution
A method and apparatus for transmitting signals in a wireless communication system using multiple antennas, where cyclic shift values are managed to optimize signal transmission on the same radio resource, with the difference between cyclic shift values determined based on the size of the radio resource and maximum delay spread, allowing for efficient use of multiple antennas to enhance data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antennas are used to improve data transfer rate, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent segments the cyclic shift values into different sets based on antenna indices. Each antenna is assigned a specific cyclic shift value from a predetermined set, allowing independent control and management of signal transmission parameters across multiple antennas. This segmentation enables the system to handle multiple antennas without overwhelming complexity by processing each antenna's signal separately with dedicated parameters.
Solution Approach 2:
The patent changes the parameter of cyclic shift values to differentiate signals transmitted through different antennas. By assigning distinct cyclic shift values to different antennas and using these values to generate orthogonal sequences, the system achieves signal separation and interference reduction. This parameter change approach allows multiple antennas to transmit simultaneously at high rates while maintaining signal distinguishability and reducing mutual interference.
2Reliability
If cyclic shift values are differentiated for multiple antennas, then reliability is improved through reduced interference, but device complexity increases
Solution Approach 1:
The patent uses a universal approach where a single predetermined set of cyclic shift values serves multiple antennas. The same set of cyclic shift values is used across all antennas, with each antenna selecting a specific value from the shared set. This universality simplifies the management complexity compared to having separate cyclic shift sets for each antenna, while still achieving reliable signal differentiation through the orthogonal properties of the sequences generated from these cyclic shifts.
Data Source
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AI summary
A method and an apparatus for transmitting data in a wireless communication system are provided. The method includes receiving cyclic shift information indicating a first cyclic shift value, obtaining a second cyclic shift value from the first cyclic shift value, transmitting a first signal based on the first cyclic shift value through a first antenna, and transmitting a second signal based on the second cyclic shift value through a second antenna, wherein the first signal and the second signal are transmitted on the same radio resource.