Communication Device Phase Vector Adjustment for PAPR Reduction
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Solution Overview
Problem
Existing communication systems face challenges in reducing Peak to Average Power Ratio (PAPR) on receiving apparatuses when the transmission path is deteriorated, leading to increased PAPR, difficulty in utilizing the dynamic range of ADCs, and deterioration of the S/N ratio.
Innovation Solution
A communication apparatus and method that select and adjust phase vectors for each communication channel and the entire communication frame, using techniques like wavelet transform and phase rotation, to minimize PAPR even under deteriorated transmission conditions, thereby optimizing the dynamic range and S/N ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase adjustment is performed using conventional methods, then PAPR reduction is achieved under good transmission conditions, but PAPR reduction performance deteriorates when transmission path conditions are poor
Solution Approach 1:
The patent applies dynamics by making the phase vector selection adaptive to transmission conditions. The receiving apparatus feeds back channel state information, and the transmitting apparatus dynamically selects phase vectors based on current transmission path conditions, transforming a static phase adjustment method into a dynamic one that adapts to varying channel quality.
Solution Approach 2:
The patent implements feedback by having the receiving apparatus measure PAPR and feed back channel state information to the transmitting apparatus. This feedback loop enables the system to adjust phase vectors based on actual transmission conditions, allowing the PAPR reduction to maintain effectiveness under deteriorated transmission paths.
2Reliability
If multiple phase vectors are used for PAPR reduction, then PAPR is reduced on transmitting apparatus, but PAPR reduction on receiving apparatus is insufficient under deteriorated transmission conditions
Solution Approach 1:
The patent segments the phase vector selection process into two parts: the transmitting apparatus selects phase vectors based on channel feedback, and the receiving apparatus applies corresponding phase adjustments. This segmentation allows each apparatus to focus on specific tasks, reducing overall system complexity while maintaining effective PAPR reduction.
Solution Approach 2:
The patent introduces channel state information as an intermediary that mediates between the transmitting and receiving apparatuses. This intermediary carries the necessary information for phase vector selection, enabling coordinated PAPR reduction without requiring complex direct communication or computation between the two apparatuses.
3Measurement precision
If high PAPR occurs on receiving apparatus, then dynamic range utilization of ADC becomes difficult, but S/N ratio deteriorates
Solution Approach 1:
The patent applies preliminary action by performing phase adjustment before signal conversion and processing. By reducing PAPR in advance through phase vector application, the signal is prepared in an optimal state for subsequent ADC conversion, ensuring both good dynamic range utilization and maintained S/N ratio throughout the reception process.
Data Source
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AI summary
A communication apparatus capable of improving the reduction performance of a PAPR on a receiving side is provided even when the state of a transmission line is defective. A communication apparatus performs a communication using a communication frame corresponding to a predetermined frequency bandwidth including a first frequency bandwidth and a second frequency bandwidth. The communication frame includes a first communication channel that corresponds to the first frequency bandwidth and that has a plurality of subcarriers and a second communication channel that corresponds to the second frequency bandwidth and that has a plurality of subcarriers. The communication apparatus sets a first phase vector with respect to the first communication channel, sets a second phase vector with respect to the second communication channel, generates communication data by adjusting a phase of symbol data using the first phase vector and the second phase vector, and transmits the communication data using the communication frame.