Modulation Layer Mapping Look-Up Table Latency Reduction
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Solution Overview
Problem
The existing modulation and precoding processes in E-UTRA systems, as defined in 3GPP TS 36.211, result in increased processing times leading to unacceptable system latency and bit rate values due to the distinct processing of multi-layer mapping and precoding as separate processes.
Innovation Solution
A look-up table (LUT) based system is introduced where input bit streams are divided into batches, with a determined modulation and precoding scheme used to map these batches into modulated and precoded layers, reducing processing time by combining the modulation and layer mapping processes into a single table-based operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distinct processes are used for modulation and multi-layer mapping as per 3GPP TS 36.211, then processing follows standard specifications, but processing time increases leading to unacceptable system latency
Solution Approach 1:
The patent combines the modulation process and multi-layer mapping process into a single integrated process. Instead of performing modulation first and then multi-layer mapping as separate distinct processes, the invention performs both operations simultaneously in one process, thereby reducing processing time and system latency while still producing results that comply with 3GPP TS 36.211 specifications
2Reliability
If distinct processes are used for modulation and multi-layer mapping, then standard specification is followed, but system latency becomes unacceptable
Solution Approach 1:
By merging the modulation and multi-layer mapping into a single process, the patent reduces the total processing time required for data transmission preparation. This time reduction directly improves system productivity by enabling higher achievable bit rates, as less time is spent on processing overhead while maintaining compliance with 3GPP TS 36.211 standards
3Manufacturing precision
If separate modulation and precoding processes are implemented, then processing accuracy is maintained, but processing time increases
Solution Approach 1:
The patent performs preliminary organization of input bits into batches or groups before the combined modulation and multi-layer mapping process. This preliminary structuring enables the subsequent single-process operation to maintain processing accuracy by systematically handling the data, while simultaneously reducing overall processing time by eliminating the need for separate sequential operations
Data Source
AI summary
Described embodiments provide a wireless communication system that employs modulation and precoding. An input bit stream is divided into one or more batches. Each batch has a consecutive number of bits. A modulation scheme is determined for batches. A precoding scheme for layer mapping is determined for the batches. Based on the modulation scheme and precoding scheme, a look-up table (LUT) is selected. The selected LUT maps the batches into one or more modulated and precoded layers. The modulated and precoded batches are provided to a transmission module.