PAPR-Managed HARQ Retransmission for Multi-Level Error Correction
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in error correction due to high Peak-to-Average Power Ratio (PAPR) in multi-carrier modulation, leading to increased HARQ retransmissions, which are computationally intensive and introduce latency.
Innovation Solution
Implementing a multi-level error correction approach that utilizes a Peak-to-Average Power Ratio Management Module (PAPR MM) for initial error correction and a channel encoder for secondary correction, based on acknowledgement types (NACK Type 1 and NACK Type 2), to reduce HARQ retransmissions by selectively applying error correction at both the front end and back end of the communication system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ retransmissions are used for error correction, then error correction capability is improved, but latency and computational overhead increase
Solution Approach 1:
The patent applies preliminary action by performing PAPR reduction on retransmitted packets before they are sent over the air interface. By pre-processing the packets to reduce peak power levels, the system prevents intermodulation distortion from occurring in the first place, thereby reducing the need for subsequent HARQ retransmissions and lowering overall latency
Solution Approach 2:
The patent segments the error correction process into two distinct stages: (1) PAPR-based preliminary error correction that handles distortion-related errors, and (2) conventional HARQ retransmission that handles residual errors. This segmentation allows each mechanism to specialize in specific error types, improving overall efficiency
2Reliability
If PAPR management techniques are applied, then signal quality is improved, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary PAPR reduction module that sits between the packet buffer and the transmitter. This intermediary component performs peak power management by identifying and reducing peak power levels in the signal, thereby improving signal quality without requiring fundamental changes to the existing communication infrastructure
Solution Approach 2:
The patent implements a simplified copying approach where retransmitted packets are copied from the buffer and then processed through PAPR reduction. Instead of performing complex re-encoding, the system copies the original packet data and applies only the necessary peak power management, reducing computational complexity
3Productivity
If multi-carrier modulation is used, then spectral efficiency is improved, but PAPR increases leading to more errors
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the peak power levels of the multi-carrier signal. By monitoring and modifying the instantaneous power parameters of the OFDM/OFDMA signal, the system maintains the spectral efficiency benefits of multi-carrier modulation while preventing the peak power excursions that cause intermodulation distortion and errors
Data Source
AI summary
Systems, methods and apparatuses for reducing HARQ retransmissions using peak power management techniques are presented. In one example, a receiver may perform multi-level error correction for reducing HARQ retransmissions. The receiver may include a Peak-to-Average-Power Ratio Management Module (PAPR MM) decoder configured to perform a first level of error correction utilizing retransmissions originating at a front end of a distal transmitter. The receiver may further include a symbol demapping module connected to the PAPR MM decoder, a deinterleaver connected to the symbol demapping module, and a decoder connected to the deinterleaver and the PAPR MM decoder, where the decoder may be configured to perform a second level of error correction utilizing retransmissions originating at a back end of the distal transmitter. A transmitter for reducing HARQ retransmissions using PAPR techniques is also presented.