Power Efficient Transmit Diversity Using Multiple Chains
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Communication devices face challenges in achieving sufficient transmit power levels for uplink signals, especially in marginal coverage areas due to distance, obstructions, or hot ambient environments, where individual transmit chains' power capabilities are insufficient.
Innovation Solution
The communication device employs transmit diversity by configuring multiple transmit chains to transmit uplink subcarriers that sum to achieve the required transmit power level, using techniques like cyclic or linear delay diversity, and selectively activating antennas for spatial diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single transmit chain is used, then device complexity is reduced, but transmit power capability is insufficient for marginal coverage areas
Solution Approach 1:
The patent combines multiple transmit chains to achieve higher transmit power levels. When a single transmit chain cannot provide sufficient power for uplink signals in marginal coverage areas, the device activates multiple transmit chains simultaneously, merging their power capabilities to meet the required transmit power level while managing the increased complexity through coordinated control.
Solution Approach 2:
The patent implements dynamic selection and activation of transmit chains based on real-time power requirements. The system dynamically determines whether one or multiple transmit chains are needed by evaluating the required transmit power level against the capability of individual chains, allowing the device to adapt its complexity level to the specific transmission scenario.
2Power
If multiple transmit chains are activated simultaneously, then transmit power level is increased, but power consumption increases
Solution Approach 1:
The patent applies partial action by activating only the necessary number of transmit chains based on the specific power requirement. Instead of always using all available transmit chains, the system determines the minimum number needed to achieve the required transmit power level, thereby avoiding excessive power consumption while still meeting the transmission requirements.
Solution Approach 2:
The patent changes the operational parameters of transmit chains dynamically. By adjusting which transmit chains are active and at what power levels, the system optimizes the balance between achieving sufficient transmit power and minimizing overall power consumption, rather than operating all chains at fixed high power levels.
3Power
If transmit chains operate at high power levels, then coverage area is extended, but thermal management capability is exceeded in hot environments
Solution Approach 1:
The patent segments the transmit power function across multiple transmit chains. Instead of overloading a single chain with high power requirements that would generate excessive heat, the system divides the total power requirement across multiple chains, each operating at manageable power levels that stay within thermal management capabilities while collectively achieving the needed coverage extension.
Data Source
AI summary
A communication device, method, and computer program product provide power efficient transmit diversity using two transmit chains to meet a transmit power level for an uplink signal when one transmit chain is insufficient. In response to determining that the first transmit power level is equal to or less than the transmit power capability of at least one of a first transmit chain and a second transmit chain, the communication device configures a corresponding one of the first transmit chain and the second transmit chain to transmit the uplink channel with at least the first transmit power level.