Cyclic Shift Preamble Scheme for Multi-Antenna AGC Control
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Solution Overview
Problem
Existing wireless communication protocols, such as IEEE 802.11n and 802.11ac, support a maximum of eight antennas, which is insufficient for the new IEEE 802.11be protocol supporting more than eight antennas, leading to issues with automatic gain control (AGC) errors.
Innovation Solution
Implementing cyclic shift diversity (CSD) on the first preamble part of each antenna using predefined CSD values to reduce AGC errors in scenarios with more than eight antennas, such as 16 antennas, while maintaining compatibility with earlier protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 8-antenna transmission technology is used, then compatibility with existing protocols is maintained, but the system cannot support new communication protocols that require more than eight antennas
Solution Approach 1:
The patent implements dynamic adaptation by allowing the system to operate with different numbers of antennas (N) where 1 ≤ N ≤ M, and dynamically adjusts the cyclic shift diversity values based on the actual number of antennas used. This enables the system to evolve from fixed 8-antenna configuration to flexible multi-antenna operation while maintaining backward compatibility through the cyclic shift mechanism that works with both old and new protocols.
Solution Approach 2:
The patent changes the parameter of cyclic shift diversity values to accommodate different antenna configurations. By defining CSD sets with specific cyclic shift values for different numbers of antennas, the system can adapt to both 8-antenna and 16-antenna configurations without requiring fundamental protocol changes, thus resolving the contradiction between support capability and compatibility.
2Productivity
If more than eight antennas are used, then system capacity is improved, but AGC errors increase
Solution Approach 1:
The patent applies parameter changes by introducing cyclic shift diversity values that are specifically optimized for different antenna configurations. The CSD sets contain predefined cyclic shift values calculated to compensate for AGC errors in multi-antenna scenarios. By changing the signal parameters through cyclic shifting, the system maintains AGC accuracy even when operating with 16 or more antennas, thus resolving the contradiction between system capacity and AGC precision.
Solution Approach 2:
The patent converts the harmful AGC errors that naturally occur in multi-antenna systems into a beneficial feature by using cyclic shift diversity to deliberately create controlled variations in the preamble signals. These variations compensate for the AGC errors in a systematic way, transforming the problematic AGC drift into a manageable and even advantageous signal characteristic that improves overall system performance.
3Manufacturing precision
If cyclic shift diversity is applied to all antennas, then AGC errors are reduced, but the complexity of the communication system increases
Solution Approach 1:
The patent segments the solution by creating separate CSD sets for different numbers of antennas (N=1 to N=M). Instead of applying a single complex cyclic shift mechanism to all antennas, the system selects from predefined segmented CSD sets based on the actual number of active antennas. This segmentation reduces the operational complexity while maintaining AGC error reduction benefits.
Solution Approach 2:
The patent applies preliminary action by pre-defining the cyclic shift diversity values in CSD sets before actual transmission occurs. The CSD sets are prepared in advance with optimized cyclic shift values for different antenna configurations, eliminating the need for real-time complex calculations. This preliminary preparation reduces the computational burden during transmission while maintaining effective AGC error reduction.
Data Source
AI summary
A cyclic shift diversity-based communication method and apparatus. A maximum number of antennas supported in this method is greater than 8. A cyclic shift is performed on a first preamble part of each antenna by using a cyclic shift diversity value, so that an automatic gain control error is reduced in response to the use of more antennas (for example, 16 antennas).