Spatially Coupled MIMO Layer Mapping for Successive Codeword Decoding
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently decoding codewords due to significant signaling overhead and reduced receiver decoding ability, particularly in multiple-input multiple-output (MIMO) configurations like LTE and 5G NR, which affect the proper decoding of codewords across multiple layers.
Innovation Solution
Implementing spatially coupled MIMO signaling by mapping a single codeword across multiple layers in a staggered manner, where each code block is transmitted using fewer or all spatial layers across different time-frequency resources, allowing for cancellation of known information to facilitate decoding of unknown blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If code blocks are transmitted using all spatial layers across multiple time-frequency resources, then the reliability of codeword decoding is improved, but the receiver decoding complexity increases significantly
Solution Approach 1:
The patent segments the codeword into multiple code blocks and transmits them across different spatial layers and time-frequency resources. The receiver processes these segmented code blocks independently through successive cancellation, dividing the complex decoding task into manageable segments that reduce overall decoding complexity while maintaining reliability.
Solution Approach 2:
The patent transmits known sequence code blocks before unknown code blocks across specific spatial layers. The receiver uses these preliminarily transmitted known blocks to establish reference information and perform successive cancellation, simplifying the decoding of subsequent unknown code blocks by removing known interference components first.
2Device complexity
If code blocks are staggered across multiple time-frequency resources with fewer spatial layers, then the decoding process is simplified through cancellation of known information, but the transmission time increases
Solution Approach 1:
The patent employs periodic transmission patterns where code blocks are staggered across time-frequency resources in a structured sequence. Known sequence code blocks are transmitted periodically before unknown code blocks, creating a rhythmic transmission pattern that enables systematic successive cancellation at the receiver, simplifying decoding while managing transmission time through efficient periodic resource utilization.
3Productivity
If multiple code blocks are transmitted using all spatial layers simultaneously, then the data throughput is improved, but the interference between code blocks increases making decoding more difficult
Solution Approach 1:
The patent segments the transmission into distinct groups: known sequence code blocks transmitted on specific spatial layers and unknown code blocks transmitted on other spatial layers. This segmentation separates interfering signals into identifiable components that the receiver can process through successive cancellation, maintaining decoding accuracy while achieving high throughput by utilizing all spatial layers.
Solution Approach 2:
The patent introduces known sequence code blocks as intermediary elements that serve as reference signals. These intermediary known blocks transmitted on specific spatial layers act as mediators that help the receiver distinguish and cancel interference from unknown code blocks on other spatial layers, enabling accurate decoding of high-throughput simultaneous multi-block transmissions.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The described techniques generally provide for spatially coupled multiple-in multiple-out (MIMO) signaling for a single codeword across multiple layers. A transmitting device may transmit, via multiple time-frequency resources using multiple spatial layers, a set of code blocks associated with a codeword. At a first time-frequency resource, each code block of a first subset of the set of code blocks may be mapped to a respective transmission layer, and at a second time-frequency resource, each code block of a second subset of the set of code blocks may be mapped to a respective transmission layer, where the second set of code blocks is staggered from the first set of code blocks. By staggering code blocks across multiple time-frequency resources, a receiving wireless device may cancel out interference of one or more previously decoded code blocks.