Transmitter Device for Low PAPR Control Data Transmission
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Solution Overview
Problem
Current mobile communication systems face challenges in transmitting control data with low Peak-to-Average Power Ratio (PAPR) and achieving optimal coding gain, particularly in 5G NR systems, where existing solutions generate interference and require complex decoding algorithms.
Innovation Solution
A transmitter device that splits input data into vertical and horizontal components, using a combination of vertical and horizontal codes with non-coherent block codes, applied through single-carrier or multi-carrier modulation to achieve low PAPR and maximize coding gain, while minimizing computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If peak windowing, scaling, or clipping is used to reduce PAPR, then PAPR is reduced, but interference and distortions are generated in the OFDM modulated signal requiring further filtering
Solution Approach 1:
The input message is segmented into two separate components: a first component for vertical coding and a second component for horizontal coding. This segmentation allows independent optimization of each coding dimension, enabling PAPR control through vertical code design while maintaining signal integrity through horizontal code structure, thereby avoiding the interference and distortions generated by conventional PAPR reduction techniques.
Solution Approach 2:
The patent employs a composite coding structure combining vertical and horizontal codes. The vertical code (e.g., Reed-Muller or polar code) provides error correction capability, while the horizontal code (e.g., orthogonal code) provides low PAPR properties. This composite approach integrates the advantages of different coding schemes to achieve both low PAPR and strong error correction without generating harmful interferences.
2Device complexity
If separate channel estimation and quasi-coherent detection are used, then decoding complexity is reduced, but detection accuracy deteriorates as the approach is sub-optimal
Solution Approach 1:
The patent merges channel estimation and detection operations by exploiting the structured nature of the vertical and horizontal codes. The receiver uses the known vertical code structure to perform joint channel estimation and detection, eliminating the need for separate operations. This unified approach optimizes detection accuracy while maintaining computational efficiency through the code's mathematical structure.
Solution Approach 2:
The detection algorithm uses feedback from the vertical code structure to improve detection accuracy. The receiver iteratively refines its detection by utilizing the known properties of the vertical code (such as the bi-orthogonal structure of RM codes or the structure of polar codes), allowing sub-optimal initial estimates to be corrected and improved through multiple passes, thereby achieving near-optimal detection performance.
3Ease of operation
If a fully non-coherent receiver is used, then detection is simplified, but complexity increases especially for RM coded cases with longer bit lengths
Solution Approach 1:
The patent applies different detection strategies to different parts of the received signal based on the code structure. The vertical code component is detected using coherent methods that exploit phase information for optimal performance, while the horizontal code component is detected using simpler non-coherent methods. This localized approach optimizes the balance between detection simplicity and complexity by applying the appropriate method to each code dimension.
Data Source
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AI summary
There is provided a transmitter device (1) for transmitting a digital input message corresponding to control data used in a control channel through a communication channel (3), the input message m comprising a number B of bits. The transmitter device comprises: - a splitter (110) configured to split the input message m comprising said B channel bits into a first component comprising BV bits and a second component comprising BH bits such that B = BH + BV, using a set of splitting parameters; - A vertical code generator (112) configured to generate a vertical code vk(m) of size P from the first component of BV bits; - A horizontal code generator (114) configured to generate a horizontal code hl(m) of size L from the second component of BH bits; - a combiner (14) configured to combine said vertical code vk(m) with said horizontal code hl(m), which provides a combined code sequence, the transmitter device (1) comprising a modulator for each transmit antenna configured to apply a single carrier or multi-carrier modulation to the combined sequence, the transmitter device being configured to transmit the modulated combined sequence over the communication channel using the transmit antennas. The size P of the vertical code is equal to the number of resource elements in each of the L modulation symbols in time and/or frequency.