Single Codeword MIMO Transmission for 5G Spectral Efficiency
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Solution Overview
Problem
Current MIMO technologies face challenges in achieving high spectral efficiency and reducing overhead in feedback signaling, especially in 5G wireless communication systems, due to the coupling of MIMO layers with different channel qualities as a single codeword, which impacts link throughput.
Innovation Solution
Implementing a low complexity, single codeword per channel transmission method, where multiple codewords are scheduled on separate control channels based on the rank of the transmission, allowing each codeword to be transmitted independently, thereby reducing feedback overhead and improving spectral efficiency across varying signal-to-interference-plus-noise ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple codewords are transmitted over a single control channel in traditional MIMO systems, then the system can support higher data layer transmissions, but the feedback overhead increases and spectral efficiency deteriorates due to coupling layers with different channel qualities
Solution Approach 1:
The patent segments the transmission by establishing multiple separate control channels (first control channel and second control channel) instead of using a single control channel. Each control channel carries its own codeword independently, allowing the system to transmit multiple codewords without coupling them together. This segmentation resolves the contradiction by enabling higher spectral efficiency through independent codeword transmission while avoiding the feedback overhead associated with traditional single-channel multi-codeword approaches.
2Productivity
If multiple codewords are scheduled on separate control channels, then feedback overhead is reduced and spectral efficiency improves, but the device complexity increases due to managing multiple control channels
Solution Approach 1:
The patent divides the control information into separate segments transmitted over distinct control channels. Each control channel operates independently with its own codeword, simplifying the processing at both transmitter and receiver ends compared to managing multiple codewords over a single channel. This segmentation reduces the complexity of feedback signaling while maintaining high spectral efficiency.
Solution Approach 2:
The patent transitions from a single-dimensional control channel approach to a multi-dimensional approach by establishing multiple control channels operating in parallel. This dimensional expansion allows independent codeword transmission without the complex interactions that would arise in a single-channel system, thereby reducing overall system complexity while improving spectral efficiency.
3Ease of operation
If a single codeword is used per channel transmission, then the transmission process is simplified and feedback overhead is reduced, but the system capacity to support high data layer transmissions is limited
Solution Approach 1:
The patent segments the high-capacity transmission requirement into multiple simpler single-codeword transmissions over separate control channels. Instead of attempting to transmit multiple codewords over a single complex channel, the system uses multiple independent control channels, each handling a single codeword. This approach maintains transmission simplicity at the channel level while achieving high system capacity through the combined effect of multiple channels.
Data Source
AI summary
A low complexity multiple input multiple output transmitter that transmits a single codeword per channel is disclosed herein. Instead of sending multiple codewords per channel for transmissions that support higher data layer transmissions, the transmitter can send single codewords over multiple channels in order to improve spectral efficiency over a range of signal to interference plus noise ratios. For instance, if a downlink transmission to a user equipment (UE) has a rank of 4, capable of supporting 4 data layers, instead of sending 2 or more codewords over a single downlink control channel, the transmitter can schedule multiple control channels and transmit a single codeword per channel. The transmitter can also include in the signaling to the UE that the multi-codewords are included in multiple downlink control channels.