Symbol Processing for Modulation-Preserving NOMA Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication technologies, such as LTE and NR, face challenges in efficiently managing increasing mobile broadband demands and interference in heterogeneous networks, particularly in scenarios involving non-orthogonal multiple access where modulation schemes like π/2 BPSK and π/4 QPSK are not preserved, leading to unsuccessful transmissions.
Innovation Solution
The implementation of symbol processing techniques that preserve specific modulation schemes like π/2 BPSK and π/4 QPSK by selecting appropriate spreading and scrambling sequences for non-orthogonal multiple access (NOMA) in resource spread multiple access (RSMA), ensuring successful data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-orthogonal multiple access is implemented to increase network capacity and support more users, then system productivity is improved, but transmission reliability deteriorates due to modulation scheme distortion
Solution Approach 1:
The patent applies parameter changes by selecting specific spreading sequences (e.g., OVSF sequences) and scrambling sequences (e.g., Gold sequences, m-sequences) that are optimized for preserving modulation schemes. By changing the parameters of these sequences to match the specific modulation scheme being used (π/2 BPSK, π/4 QPSK, etc.), the system maintains transmission reliability while enabling non-orthogonal multiple access to support increased network capacity.
2Reliability
If spreading and scrambling sequences are applied to preserve modulation schemes, then transmission reliability is improved, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent implements preliminary action by pre-selecting and storing spreading sequences and scrambling sequences that are specifically designed to preserve modulation schemes before transmission occurs. The UE and base station have pre-configured sequence sets that match different modulation schemes, eliminating the need for complex real-time sequence generation and selection during transmission, thus reducing processing complexity while maintaining reliability.
3Reliability
If modulation schemes are preserved for specific user equipment, then transmission reliability is improved, but adaptability decreases due to limited modulation scheme options
Solution Approach 1:
The patent applies dynamics by making the spreading sequence and scrambling sequence selection adaptive to the specific modulation scheme being used. The system dynamically selects from multiple pre-configured sequence sets that correspond to different modulation schemes (π/2 BPSK, π/4 QPSK, QPSK, 16QAM, etc.). This allows the system to maintain high transmission reliability for each specific modulation scheme while simultaneously supporting a wide variety of modulation schemes, thus achieving both reliability and adaptability.
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may determine, when using resource spread multiple access with non-orthogonal multiple access, that a particular modulation scheme is enabled. The user equipment may process symbols using a set of processing sequences selected based at least in part on the particular modulation scheme such that the particular modulation scheme is preserved for the symbols. The user equipment may transmit the symbols based at least in part on processing the symbols using the set of processing sequences. Numerous other aspects are provided.