TDD Transceiver Circuit Pathway Leakage Reduction
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Solution Overview
Problem
Time division duplex (TDD) communication systems face interference issues due to the use of a common frequency for both transmission and reception, leading to leakage problems that can degrade data throughput and disrupt reception, especially with advanced modulation schemes.
Innovation Solution
A method and apparatus that utilize separate circuit pathways for transmission and reception, with an alternate pathway having a higher attenuation factor than the primary reception pathway to minimize interference, by switching the transmission signal to this alternate pathway during reception mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a common frequency is used for both transmission and reception in TDD systems, then the transceiver can operate in both directions using the same frequency resource, but signal leakage from transmission disrupts reception and degrades data throughput
Solution Approach 1:
The patent segments the circuit pathways into multiple separate paths: a first circuit pathway for transmission and a second circuit pathway for reception. By physically separating the transmission and reception signal paths, the patent eliminates signal leakage from the transmission path into the reception path, thereby resolving the contradiction between maintaining productivity and reducing harmful signal leakage.
Solution Approach 2:
The patent introduces a third circuit pathway as an intermediary with higher attenuation factor that can be selectively activated. This intermediary pathway acts as a buffer or mediator that further isolates the transmission signal from the reception path when needed, providing additional protection against signal leakage while maintaining the benefits of common frequency operation.
2Reliability
If guard bands are used between transmit and receive time slots to allow components to switch, then switching effects are minimized, but data rates are restricted
Solution Approach 1:
The patent extracts the switching function from the time domain (guard bands) and implements it in the circuit domain through separate physical pathways. By taking out the need for time-based guard bands and replacing it with spatial separation through multiple circuit paths, the patent eliminates the trade-off between switching stability and data rate, allowing both to be optimized simultaneously.
3Productivity
If advanced modulation schemes are used to increase data capacity, then throughput is improved, but the system becomes more susceptible to noise and leakage interference
Solution Approach 1:
By segmenting the circuit pathways into separate transmission and reception paths, the patent creates isolated signal channels that prevent leakage from the high-power transmission signal from interfering with the sensitive reception signal. This segmentation protects advanced modulation schemes from noise and leakage interference, allowing high data capacity to be achieved without increased susceptibility to interference.
Data Source
AI summary
Embodiments provide a method and apparatus for performing time division duplex communication, such as may be performed over a wireless communications network. In the embodiments a first circuit pathway is used to transmit a first radio frequency signal in a transmission mode and a second circuit pathway is used to receive a second radio frequency signal in a reception mode. In the reception mode, the first radio frequency signal is switched to an alternate circuit pathway. This may be performed by a radio frequency integrated circuit or by other control circuitry. Switching to an alternate circuit pathway reduces leakage of the first radio frequency signal into the second radio frequency signal.