Wireless Transmission Clipping via Resource Allocation
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Solution Overview
Problem
In wireless communication systems using Clipped DFT-S-OFDM, the need to notify the reception apparatus about the clipped frequency spectrum leads to an increase in control information, reducing data transmission throughput.
Innovation Solution
The wireless transmission apparatus determines the frequency band for clipping using information other than directly specifying frequency bands, such as allocation resource bandwidth, based on pre-defined tables or clipping rates, eliminating the need for explicit clipping information notification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clipping information is explicitly notified to the reception apparatus, then the reception apparatus can correctly identify the clipped frequency spectrum, but the amount of control information increases
Solution Approach 1:
The reception apparatus autonomously determines clipping information by independently calculating the frequency band to be clipped based on parameters already contained in the control information (resource allocation, modulation scheme, coding rate). This eliminates the need for separate clipping information notification while ensuring accurate identification of the clipped spectrum, as both transmission and reception apparatuses use the same calculation method.
2Adaptability or versatility
If clipping information is explicitly notified, then the transmission and reception apparatuses can share clipping information, but data transmission throughput decreases due to increased control information
Solution Approach 1:
The existing control information parameters (resource allocation, modulation scheme, coding rate) serve dual purposes: they control the transmission parameters and simultaneously enable the reception apparatus to determine the clipping information. This multi-functional use of control information maintains clipping information sharing capability without increasing the overall control information volume, thereby preserving data transmission throughput.
3Productivity
If clipping is performed in Clipped DFT-S-OFDM, then spectrum efficiency is improved, but the system requires additional control information for clipping notification
Solution Approach 1:
The clipping information is pre-determined by the reception apparatus using the control information parameters before data reception. By performing this determination action in advance, the system maintains the spectrum efficiency benefits of clipping while avoiding the need for additional real-time clipping information transmission.
Data Source
AI summary
There is implemented a clipping technique that does not require a reception apparatus or a transmission apparatus to notify a transmission apparatus or a reception apparatus of information on clipping. A wireless transmission apparatus performs clipping processing not to transmit a spectrum of part of a frequency domain signal when transmitting data to a wireless reception apparatus and determines a frequency band to be subjected to the clipping processing using information other than information notified from the wireless reception apparatus and directly specifying a frequency band to be subjected to the clipping processing.