Diversity Receiver Dynamic Antenna Control
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Solution Overview
Problem
Conventional diversity receiver systems in wireless handsets face challenges in cost and power efficiency due to the need for multiple antennas and SAW filters, which lead to increased costs and noise figure degradation, especially when transmissions from one transceiver interfere with other receivers.
Innovation Solution
A diversity receiver system that dynamically controls antenna diversity by using a baseband processor to assess signal strengths and disable unnecessary receiving channels based on bit error rates and signal differences, eliminating the need for a second SAW filter and reducing power consumption by switching between single and dual antenna modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diversity receiver system uses two receiving channels with SAW filters to protect from blocker signals, then reception characteristics are improved, but cost and device complexity increase due to requiring two SAW filters
Solution Approach 1:
The patent implements dynamic control of antenna diversity by using a baseband processor to assess signal strengths and bit error rates, enabling the system to switch between single and dual antenna modes based on real-time conditions. This dynamic approach allows the receiver to use diversity only when necessary, reducing the need for permanent dual-channel protection hardware
Solution Approach 2:
The system changes operational parameters by monitoring signal strength differences and bit error rates to determine when to activate or deactivate receiving channels. By adjusting the operational state of receiving channels based on measured parameters, the system achieves reliable reception without permanently maintaining complex dual-channel architecture
2Reliability
If a diversity receiver system uses two receiving channels with SAW filters, then protection from blocker signals is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic control of antenna diversity by using a baseband processor to assess signal strengths and bit error rates, enabling the system to switch between single and dual antenna modes based on real-time conditions. This dynamic approach allows the receiver to use diversity only when necessary, reducing the need for permanent dual-channel protection hardware
Solution Approach 2:
The baseband processor periodically assesses signal strengths and bit error rates to determine when diversity reception is needed. By using periodic monitoring rather than continuous operation of all channels, the system achieves adequate protection from blockers while minimizing power consumption during normal operation
3Area of stationary object
If a handset unit places wireless transceivers in close proximity to share space, then device compactness is improved, but interference from blocker signals increases
Solution Approach 1:
The patent extracts the blocker signal protection function from dedicated hardware filters in both channels and implements it selectively through baseband processing. By separating the protection function from fixed hardware architecture, the system can provide adequate protection against interference from closely-placed transceivers without requiring symmetric dual-channel filter configurations
Solution Approach 2:
The baseband processor acts as an intermediary that assesses the impact of blocker signals and dynamically controls receiving channel operation. This intermediary layer enables the system to manage interference from closely-placed transceivers by intelligently activating diversity reception only when blocker interference is detected, rather than requiring permanent protective hardware in both channels
Data Source
AI summary
A diversity receiver includes a first receiving channel and a second receiving channel. The receiver also includes a baseband processor that computes a difference between the received signal strengths of the signals received from the first and second channels, wherein the processor disables the signal received from the second channel if the difference is greater than a first threshold value and a BER associated with the second receiving channel is greater than a BER threshold value, and disables the signal received from the first channel if the difference is less than the negative first threshold value and the bit error rate (BER) associated with the first channel is greater than the BER threshold value. The receiver further includes a bypass circuit coupled to an input of an amplifier and a RSSI circuit that provides a conduction path between the input and a ground when the RSSI circuit detects a blocker signal.