Wireless Communication System Transmit Power Control for Overloaded Resource Blocks
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Solution Overview
Problem
In wireless communication systems, the mutual information of transmit data decreases significantly with increasingly overloaded frequency bands, leading to decoding failures due to thermal noise, especially when equalization processing is impaired.
Innovation Solution
A wireless communication system that adjusts transmit power and modulation schemes based on the overload ratio of resource blocks, using a control information determiner to increase transmit power for streams with higher overload ratios and lower spectral efficiency, and selecting appropriate precoder matrices to enhance channel characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency bands are overloaded to increase spectral efficiency, then spectral efficiency is improved, but mutual information decreases and decoding reliability deteriorates
Solution Approach 1:
The invention changes the transmit power parameter dynamically based on the overload ratio. When the overload ratio increases (indicating more frequent spectrum overlap), the transmit power is increased to compensate for the degradation in mutual information, thereby maintaining decoding reliability while allowing spectral efficiency to improve through overloading
2Reliability
If transmit power is increased to improve mutual information, then decoding reliability is improved, but energy consumption increases
Solution Approach 1:
The invention implements dynamic transmit power control where the transmit power is adjusted in real-time based on the overload ratio condition. Rather than maintaining high power continuously, the system adapts power levels to match the actual spectral overlap conditions, consuming more energy only when necessary to maintain reliability under high overloading conditions
3Reliability
If equalization processing is applied to correct errors, then error correction capability is improved, but system complexity increases
Solution Approach 1:
The invention applies preliminary action by adjusting transmit power before transmission based on predicted or measured overload conditions. This preventive measure reduces the severity of errors that would otherwise require complex equalization processing, thereby maintaining error correction capability while avoiding the need for highly complex equalization algorithms
Data Source
AI summary
Provided are a wireless communication system, communication apparatus, communication method, and communication program able to more reliably decode transmit signals at a receiver without more complex processing, even when resource blocks are overloaded. A communication apparatus configured to decode data received on each of at least two streams comprises: a resource block allocation determiner configured to determine an allocation of resource blocks for each stream; and a control information determiner configured to determine control information regarding data transmission on at least one stream, on the basis of the overload ratio of resource blocks among at least one group of streams.