Multi-Frequency Point Access Mode Configuration for PAPR Optimization
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Solution Overview
Problem
Current communication systems, such as LTE, face challenges with peak average power ratio (PAPR) issues in OFDM systems, leading to nonlinear distortion and interference among sub-channels, particularly when dealing with multiple working frequency points, where existing multi-access modes are not well-suited for systems with multiple frequency points like LTE-Advanced and IMT-Advanced.
Innovation Solution
A method and apparatus for multiple frequency point multiple access that configures different or the same multi-access modes (SC-FDMA, OFDMA, clustered SC-FDMA, and NxSC-FDMA) for uplink and downlink information transmission on each working frequency point, allowing for adaptive allocation and adjustment of frequency points to optimize link performance and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OFDMA is used for uplink transmission, then spectral efficiency is improved, but PAPR increases causing nonlinear distortion and sub-channel interference
Solution Approach 1:
The system segments the uplink transmission into different frequency points, with some frequency points using OFDMA mode and others using SC-FDMA mode. This segmentation allows the system to achieve high spectral efficiency on frequency points where high PAPR is acceptable, while maintaining low distortion on frequency points where linearity is critical.
Solution Approach 2:
Different multi-access modes are applied to different frequency points based on local requirements. Specifically, OFDMA is applied to frequency points where spectral efficiency is prioritized, while SC-FDMA is applied to frequency points where low PAPR is more important, achieving local optimization of system performance.
2Object-generated harmful factors
If SC-FDMA is used for uplink transmission, then PAPR is reduced improving linearity, but spectral efficiency decreases
Solution Approach 1:
The uplink transmission is segmented across multiple frequency points, with each frequency point using the most appropriate multi-access mode for its specific requirements, rather than forcing a single mode across all frequencies.
Solution Approach 2:
The system dynamically selects the multi-access mode for each frequency point based on channel conditions, terminal capabilities, and system load, allowing flexible adaptation between OFDMA and SC-FDMA modes to optimize both spectral efficiency and PAPR performance.
3Device complexity
If a single multi-access mode is used across all frequency points, then system complexity is reduced, but adaptability to different PAPR requirements deteriorates
Solution Approach 1:
The system implements a universal multi-access framework that supports both OFDMA and SC-FDMA modes within the same uplink transmission system. This multi-functionality allows the system to adapt to different PAPR requirements across frequency points while maintaining a unified system architecture and control mechanism.
4Adaptability or versatility
If multiple multi-access modes are configured across frequency points, then adaptability to different requirements is improved, but system complexity increases
Solution Approach 1:
The system performs preliminary configuration of multi-access modes for each frequency point during system initialization or network reconfiguration, rather than making dynamic decisions for each transmission. This preliminary action reduces real-time complexity while maintaining adaptability to different frequency point requirements.
Data Source
AI summary
The present invention discloses a method and apparatus for multiple frequency point multiple access, which method comprises: in the situation that a system comprises a plurality of working frequency points, configuring a multi-access mode for the sending of uplink information and the sending of downlink information of each working frequency point in a plurality of working frequency points respectively; and each working frequency point performing the sending of the uplink information and the sending of the downlink information according to the configured multi-access modes. By way of the above technical solution, a simple multi-access mode is provided, which ensures the link performance of the working frequency point, improves the throughput of the entire network, and at the same time takes the problem of system peak average power ratio into account.