Multi-Chain AGC for WLAN Receivers Under Multipath and Signal Overload
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing WLAN receiver systems with single antennas use a 'one size fits all' gain control approach, which fails to optimize amplifier performance, and those with multiple antennas lack independent gain adjustments, leading to suboptimal wireless connection quality due to multipath distortion and signal overload.
Innovation Solution
A WLAN receiver system with multiple antennas that employs independent automatic gain control (AGC) for each amplifier chain, using AGC pre-processors and controllers to compute and adjust gains for RF, IF, and baseband amplifiers, incorporating power detection and correlation techniques to manage signal saturation and optimize signal strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a 'one size fits all' gain control approach is used in WLAN receivers, then the system complexity is reduced, but amplifier performance optimization is failed
Solution Approach 1:
The patent divides the single gain control system into multiple independent AGC chains, with each chain having its own AGC processor that independently controls the amplifiers in that specific signal path. This segmentation allows each amplifier chain to be optimized independently based on its own signal characteristics, resolving the contradiction between system complexity and performance optimization.
Solution Approach 2:
The patent implements local quality control by allowing each AGC chain to adjust gain parameters specific to its local signal conditions rather than applying a uniform gain control across all chains. Each chain's AGC processor monitors and adjusts gains based on local signal strength and quality metrics, enabling optimized performance for each amplifier chain while maintaining manageable system complexity through modular design.
2Reliability
If multiple antennas are used to achieve diversity, then multipath effects are mitigated, but independent gain adjustments are lost leading to suboptimal connection quality
Solution Approach 1:
The patent segments the receiver into multiple independent AGC chains, where each chain corresponding to an antenna path has its own AGC processor and independent gain control capability. This allows each antenna path to independently adjust its gain settings based on its specific signal conditions, maintaining ease of operation through automated control while enabling optimal performance for each diversity path.
Solution Approach 2:
The patent implements dynamic gain control where each AGC chain can independently and dynamically adjust its gain parameters in real-time based on changing signal conditions. This dynamic adaptation allows the system to optimize connection quality for each antenna path independently while maintaining automated operation, resolving the contradiction between reliability and ease of operation.
3Device complexity
If gain control adjusts all amplifiers with the same gain value, then the control system is simplified, but signal distortion and overload occur
Solution Approach 1:
The patent segments the unified gain control into multiple independent AGC chains, where each chain's AGC processor controls only the amplifiers in that specific chain. This segmentation prevents signal distortion and overload by allowing independent gain adjustment for each chain based on its specific signal conditions, while keeping each individual chain's control logic simple and manageable.
Solution Approach 2:
The patent applies local quality control by having each AGC chain adjust gain parameters specific to its local signal characteristics rather than applying a uniform gain across all chains. Each chain monitors its own signal strength and quality, and adjusts gains locally to prevent distortion and overload in that specific path, resolving the contradiction between control simplicity and signal quality.
4Reliability
If independent AGC chains are implemented for each amplifier, then amplifier performance is optimized, but system complexity increases
Solution Approach 1:
The patent segments the complex gain control function into multiple independent, identical AGC chains. Each chain is a self-contained module with its own AGC processor and control logic. This segmentation allows the system to achieve high reliability through independent optimization of each chain while managing overall complexity through modular, repeatable design patterns that can be implemented using standard integrated circuit blocks.
Solution Approach 2:
The patent implements universality by designing each AGC chain as a universal, multi-functional module that can handle all amplifier types (RF, IF, baseband) within its chain. Each AGC processor serves multiple functions including signal monitoring, gain calculation, and control signal generation. This universal design reduces overall system complexity by using identical modular blocks rather than specialized circuits for each function.
Data Source
AI summary
A wireless local area network (WLAN) system can have multiple antennas to improve signal detection and decoding. A WLAN receiver in such a system includes multiple amplifiers that can appropriately size an incoming signal and an automatic gain control unit to process the received incoming signals. The amplifiers of a chain of the WLAN receiver, i.e. an antenna and associated receiver components, can be adjusted with computed gains. To optimize the wireless system detection and decoding, the automatic gain control unit can advantageously compute these gains for each amplifier in the WLAN receiver.