Multi-Rate Control Unit for MIMO Channel Adaptation
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Solution Overview
Problem
Multi-channel communication systems face challenges in optimizing transmission capacities due to varying channel conditions, leading to inefficient bit rate allocation and increased hardware complexity, particularly in MIMO systems where channels with different conditions require distinct coding and modulation schemes.
Innovation Solution
The implementation of a multi-rate control (MRC) unit within the transmitter, which splits encoded bits into sets based on channel conditions and adjusts code rates for each channel, allowing for flexible rate-matching and prioritization of bit transmission based on channel quality, thereby optimizing bit allocation and reducing hardware complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple independent encoders and rate matchers are used for each channel in an MCW scheme, then transmission capacity is improved by adapting to different channel conditions, but hardware complexity increases significantly
Solution Approach 1:
The patent merges multiple independent encoders and rate matchers into a single shared encoder and rate matcher that serves all channels. The encoder generates coded bits that are then distributed to multiple channels, eliminating the need for separate encoder instances for each channel while maintaining the ability to adapt to different channel conditions through unified rate matching control.
Solution Approach 2:
The shared encoder and rate matcher are designed to perform multiple functions by serving different channels with different coding rates and configurations. The rate matcher can dynamically adjust the code rate for each channel based on channel conditions, making a single hardware unit universally applicable to multiple channels rather than requiring dedicated units for each.
2Reliability
If channel-specific coding and modulation schemes are implemented, then error probability is reduced by matching transmission parameters to channel conditions, but device complexity increases
Solution Approach 1:
The system implements dynamic rate matching where the coding rate and modulation scheme are adjusted in real-time based on channel conditions. The rate matcher can change the code rate dynamically for different channels and time instances, allowing the system to adapt to varying channel quality without requiring separate static configurations for each channel condition.
Solution Approach 2:
The patent changes the coding parameter (code rate) dynamically based on channel conditions. By adjusting the rate matching parameter, the system can switch between different effective code rates (e.g., 1/3, 2/3, 3/4) and modulation schemes to match the channel quality, thereby optimizing reliability without adding complex hardware for each parameter configuration.
3Productivity
If bits are transmitted uniformly across all channels, then transmission simplicity is maintained, but transmission capacity is reduced due to inability to exploit better channel conditions
Solution Approach 1:
The patent applies local quality by allowing different channels to have different effective code rates and transmission characteristics based on their individual channel conditions. The rate matcher can assign higher code rates (more aggressive puncturing) to channels with better conditions and lower code rates to channels with poorer conditions, optimizing the overall transmission capacity by treating each channel locally according to its quality.
Data Source
AI summary
An apparatus for data processing in a multi-channel communication system is provided. The apparatus includes an encoder configured to encode a number of bits for transmission via channels in the multi-channel communication system into coded bits and split the coded bits into a number of first sets of bits at a first ratio, a number of first rate units coupled to the encoder, each of the first rate units being configured to adjust one set of the first sets of bits in size at at least one rate, and a controller configured to assign the first ratio to the encoder and the at least one rate to each of the first rate units based on conditions of the channels.