Antenna Selection for MIMO WLAN Data Throughput
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In MIMO WLAN systems, data throughput is limited due to data collisions and performance degradation caused by the inability of access points with fewer receiving antennas to distinguish between multiple data streams from transmitting stations, leading to reduced interference reduction and increased system costs.
Innovation Solution
Implementing a selective diversity scheme where each station detects the channel status of its antennas and selects the best antenna for data transmission, reducing the number of RF chains needed and allowing the access point to recover data streams despite collisions by using antenna diversity and adaptive antenna selection based on channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple stations transmit data simultaneously via multiple antennas, then data throughput increases, but data collisions occur and receiving performance degrades when the access point has fewer receiving antennas than data streams
Solution Approach 1:
The patent implements dynamic antenna selection where stations adaptively choose which antennas to activate based on real-time channel conditions and collision detection. The system transitions from static full-antenna operation to dynamic partial-antenna operation, allowing stations to adjust their transmitting antenna configuration according to current network state to avoid collisions and maintain reliable reception.
Solution Approach 2:
The patent changes the parameter of active antenna count from fixed to variable. Stations modify the number of active transmitting antennas based on channel status and collision probability assessment. This parameter change enables the system to optimize between throughput (more antennas) and reliability (fewer antennas to avoid collisions), resolving the contradiction dynamically.
2Device complexity
If the access point uses fewer receiving antennas, then system costs decrease, but the ability to distinguish between multiple data streams is reduced
Solution Approach 1:
The patent applies preliminary action by having stations detect channel status and assess collision probability before transmitting data. This preliminary assessment allows stations to pre-select optimal antennas and adjust transmission parameters, ensuring that even with fewer receiving antennas at the access point, the system can successfully distinguish data streams by avoiding collisions in the first place.
Solution Approach 2:
The patent implements feedback mechanisms where stations continuously monitor channel conditions and collision status. This feedback information is used to adjust antenna selection and transmission parameters dynamically, allowing the access point to operate with fewer receiving antennas while maintaining data stream discrimination capability through adaptive rather than static configuration.
3Productivity
If stations use selective diversity scheme to improve throughput, then data rates increase, but the complexity of antenna selection and channel detection increases
Solution Approach 1:
The patent applies partial action by having stations select only a subset of available antennas for transmission rather than using all antennas or none. This partial antenna activation reduces the complexity burden on the access point's receiving system while still providing diversity gain for improved throughput. The station performs selective diversity only to the extent necessary to achieve reliable communication under current conditions.
Data Source
AI summary
In a Multiple-Input Multiple-Output (MIMO) wireless local area network (WLAN) system, a method is provided for selecting at least one antenna from a plurality of antennas and transmitting a data frame from a station to an access point via the selected antenna or antennas. A method for transmitting data from a plurality of stations to an access point in the MIMO WLAN system includes detecting a channel status of a channel from the access point to each transmitting antenna of the station, selecting at least one transmitting antenna from among the station's transmitting antennas based on the detected channel status, and transmitting a data frame from the station to the access point via the selected transmitting antenna or antennas.