Single RF Chain Antenna Switching for Diversity Gain
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Solution Overview
Problem
The deployment of multi-antenna systems in wireless communication is limited by increased cost, complexity, and power consumption, particularly in wireless handsets, due to the need for separate RF chains for each antenna, which disrupts receiver modems and results in inefficient propagation channel estimation.
Innovation Solution
A method and system that achieve space and time diversity gain by modifying pilot channel codes to measure signal strengths across multiple receive antennas, combining signals based on these strengths, and using a single weight generator to adjust phase and amplitude, enabling efficient channel estimation and signal processing without the need for multiple RF chains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transmit and receive antennas are deployed to achieve diversity gain and improve system capacity, then signal-to-noise ratio and system performance are improved, but system complexity, power consumption, and cost increase due to the need for separate RF chains for each antenna
Solution Approach 1:
The patent combines multiple antenna reception functions into a single RF chain by using a time-division switching mechanism. The receiver alternates between connecting to different antennas through a switch, allowing one RF chain to serve multiple antennas sequentially. This merging approach maintains the diversity gain of multiple antennas while eliminating the need for separate RF chains, thereby reducing system complexity and power consumption.
Solution Approach 2:
The patent implements periodic switching between different antennas in the time domain. The receiver periodically connects to each antenna in sequence, creating a time-diversity effect. This periodic action allows the single RF chain to capture signals from multiple antennas at different time instances, achieving space and time diversity gain without requiring simultaneous multiple RF chains.
2Reliability
If multiple RF chains are used for each antenna to maintain continuous reception, then signal reception quality is improved, but power consumption increases
Solution Approach 1:
The patent merges the functionality of multiple RF chains into a single shared RF chain. By using a time-division multiplexing approach, the single RF chain processes signals from multiple antennas sequentially rather than simultaneously. This consolidation dramatically reduces power consumption while maintaining signal reception quality through the combination of spatial and temporal diversity.
3Device complexity
If antenna switching is implemented to reduce hardware complexity, then system cost is reduced, but throughput decreases due to modem disruption during switching
Solution Approach 1:
The patent performs channel estimation and signal processing operations in advance during the switching intervals. By preparing data structures and pre-processing signals before the actual reception phase, the system minimizes the impact of switching on throughput. The preliminary actions ensure that when switching occurs, the modem can quickly resume operations without significant performance degradation.
4Productivity
If separate RF chains are deployed for each antenna to avoid switching, then throughput is maintained, but propagation channel estimation becomes inefficient and costly
Solution Approach 1:
The patent merges multiple antenna processing functions into a single RF chain with time-division switching. This approach reduces manufacturing cost by eliminating redundant RF chain components (LNAs, filters, downconverters, ADCs) while maintaining throughput through efficient switching mechanisms and pre-processing techniques that minimize interruption to data flow.
Data Source
AI summary
Certain aspects of a method and system for achieving space and time diversity gain are disclosed. Aspects of one method may include modifying a generalization code of at least one pilot channel, to measure signal strengths for each of a plurality of received multipath signals. A portion of the plurality of received multipath signals may be combined based on the measured signal strengths. The signal strengths of the plurality of received multipath signals may be measured on a primary pilot channel by assigning its generalization code to zero. The signal strengths of the plurality of received multipath signals on a secondary pilot channel may measured by assigning its generalization code to a non-zero value.