Dynamic Transmission Power Backoff for Spurious Emission Control
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Solution Overview
Problem
Existing wireless communication systems apply excessive power backoff, resulting in decreased transmission power due to spurious emissions outside the desired frequency range, which can be unnecessary for smaller dynamic transmission bandwidths and lower modulation orders.
Innovation Solution
Dynamically adjust transmission power based on dynamic transmission bandwidth and modulation order to determine the necessity of additional power backoff, allowing greater transmission power without excessive interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If power backoff is applied to prevent spurious emissions outside the frequency range, then interference with other signals is reduced, but transmission power decreases
Solution Approach 1:
The patent applies dynamic power backoff adjustment based on actual transmission conditions. The system determines whether additional power backoff is necessary by evaluating the dynamic transmission bandwidth and modulation order, adjusting the power backoff level dynamically rather than applying a fixed reduction. This resolves the contradiction by making the power backoff adaptive - applying it only when necessary to prevent interference, thereby maintaining maximum transmission power when conditions allow.
Solution Approach 2:
The patent changes the power backoff parameter based on transmission bandwidth and modulation order. When the dynamic transmission bandwidth is below a threshold or modulation order is low, the system adjusts the power backoff parameter to be less conservative, allowing higher transmission power. This parameter adjustment resolves the contradiction by optimizing the balance between preventing interference and maintaining transmission power based on actual signal characteristics.
2Reliability
If maximum power backoff is applied to ensure sufficient signal quality, then signal quality is maintained, but transmission efficiency decreases
Solution Approach 1:
The system dynamically adjusts power backoff based on transmission conditions to maintain signal quality only when necessary. By evaluating bandwidth and modulation order, the system applies power backoff dynamically rather than continuously, maintaining signal quality reliability while improving transmission efficiency by avoiding unnecessary power reduction.
Solution Approach 2:
The patent changes the power backoff parameter based on transmission bandwidth and modulation order thresholds. When conditions are favorable (bandwidth below threshold or low modulation order), the system adjusts parameters to allow higher power transmission, thereby improving transmission efficiency while maintaining sufficient signal quality through selective rather than continuous power backoff.
3Object-affected harmful factors
If power backoff is applied for all transmission bandwidths, then interference is minimized, but unnecessary power reduction occurs for smaller bandwidths
Solution Approach 1:
The patent applies different power backoff levels to different transmission scenarios based on local conditions. For smaller bandwidths below a threshold or low modulation orders, the system applies a different (reduced) power backoff level compared to larger bandwidths. This local quality approach resolves the contradiction by tailoring the power backoff to the specific transmission conditions, minimizing spurious emissions only where necessary while reducing unnecessary power loss in other cases.
Solution Approach 2:
The system changes the power backoff parameter based on the transmission bandwidth and modulation order. When bandwidth is below a threshold or modulation order is low, the patent adjusts the power backoff parameter to a less conservative value, thereby reducing unnecessary power loss while still maintaining adequate control of spurious emissions through conditional parameter adjustment.
Data Source
AI summary
An electronic device receives an indication of a number of physical resource blocks and subcarrier spacing of at least a portion of a transmission channel and determines a dynamic transmission bandwidth, or receives an indication of a modulation coding scheme of the transmission channel and determines a modulation order. The electronic device transmits, using a transmitter, a signal over at least the portion of the transmission channel based on the dynamic transmission bandwidth being less than or equal to a threshold bandwidth, or the modulation order not corresponding to an additional power backoff, using a first power based on a maximum output power capacity of the electronic device and a maximum power reduction. Otherwise, the electronic device transmits the signal over at least the portion of the transmission channel at a second power based on the maximum output power capacity, the maximum power reduction and the additional power backoff.