Secondary Receiver Path for RF Sensitivity
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Solution Overview
Problem
Wireless devices face challenges in achieving high receiver sensitivity due to high insertion loss and frequency drift in duplex filters, which are exacerbated by transmitter power heating and intermodulation products in full duplex systems, making it difficult to optimize antenna performance across various use cases.
Innovation Solution
Incorporating a secondary receiver with a separate antenna and optimized RF filter to reduce insertion loss and improve sensitivity, allowing for selection of the best reception path based on use cases and radio access technology, while keeping the primary antenna optimized for transmission frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a duplex filter is used in the transceiver to enable full duplex communication, then bidirectional radio frequency communication is achieved, but high insertion loss and frequency drift occur in the receiver path due to transmitter power heating
Solution Approach 1:
The system is divided into two independent receiver paths: a first receiver path in the transceiver portion and a second receiver path in a separate receiver portion. This segmentation allows each receiver path to operate independently with its own optimized filter characteristics, eliminating the degradation caused by transmitter power heating in a shared duplex filter.
Solution Approach 2:
A separate receiver portion is introduced as an intermediary component that provides an alternative reception path. This separate receiver portion includes its own duplex filter or bandpass filter that is not subjected to the same thermal effects as the transceiver's duplex filter, thereby maintaining better receiver sensitivity.
2Device complexity
If the antenna is common for both transmitter and receiver, then the device structure is simplified, but it is not possible to fully optimize antenna performance to receiver frequencies without affecting transmitter frequency band performance
Solution Approach 1:
The antenna system is segmented into a first antenna for the transceiver and a second antenna for the separate receiver portion. This allows each antenna to be independently optimized for its specific frequency band and function, with the second antenna specifically optimized for receiver frequencies without compromising transmitter performance.
Solution Approach 2:
Different antenna elements are designed with locally optimized characteristics: the first antenna is optimized for transmitter frequencies while the second antenna is optimized for receiver frequencies. This local optimization allows each antenna to perform at its best for its intended purpose without being constrained by the other frequency band.
3Productivity
If transmitter and receiver are active simultaneously in full duplex systems, then bidirectional communication is enabled, but intermodulation products from transmitter signal directly impact receiver operating band
Solution Approach 1:
The receiver functionality is segmented into two separate paths with independent filtering chains. The first receiver path uses the transceiver's duplex filter while the second receiver path uses a separate filter in the receiver portion. This segmentation provides additional isolation and allows selection of the path with better interference rejection for specific operating conditions.
Solution Approach 2:
The separate receiver portion acts as an intermediary that provides an alternative signal path with different filtering characteristics. This separate path can be selected when it provides better rejection of intermodulation products, effectively mediating the interference problem by offering a cleaner reception path.
4Device complexity
If a single receiver path is used, then device complexity is reduced, but receiver sensitivity is degraded due to high insertion loss in the duplex filter
Solution Approach 1:
The receiver function is segmented into two parallel paths: the first receiver path through the transceiver's duplex filter and the second receiver path through the separate receiver portion's filter. This segmentation allows the system to select the path with lower insertion loss for each operating condition, thereby maintaining high receiver sensitivity without requiring both paths to be always active.
Solution Approach 2:
The system dynamically selects between the first and second receiver paths based on operating conditions such as frequency band, temperature, and interference levels. This dynamic selection allows the system to adaptively choose the optimal reception path, maintaining high sensitivity across different operating scenarios while managing device complexity through intelligent control.
Data Source
AI summary
Apparatus, methods, and computer program products are disclosed for: selecting a reception path to receive information from a first receiver path through a first receiver portion in a transceiver portion of the apparatus or from a second receiver path in a receiver portion separate from the transceiver portion of the apparatus, wherein both of the first and second receiver paths receive the information using a same frequency band of a same radio access technology; and receiving the information using the selected reception path. Apparatus, methods, and computer program products are disclosed for: transmitting first information using a transmission frequency band of a radio access technology over a transmission path in a transceiver; and, for the radio access technology and a reception frequency band, receiving second information over a receiver path in a secondary receiver, where the transceiver does not have a receiver path configured to receive the reception frequency band.