PUCCH Control Information Transmission via Joint Coding and DFT Precoding
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting control information, particularly in peak-to-average ratio (PAPR) management and resource allocation for uplink signals, which affects the performance of control channels like PUCCH in LTE systems.
Innovation Solution
The method involves joint-coding control information to obtain a single codeword, followed by modulation symbol sequence generation, circular shifting, and Discrete Fourier Transform (DFT) precoding to efficiently transmit complex symbol sequences through the PUCCH, utilizing SC-FDMA symbols and specific circular shift values determined by pseudo-random sequences for effective resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If control information is transmitted using conventional methods in PUCCH, then the control channel can operate, but the peak-to-average ratio (PAPR) is high and resource allocation is inefficient
Solution Approach 1:
The patent applies DFT precoding to transform the control information signal in the time domain to frequency domain, which changes the signal parameters and reduces PAPR. The circular shifting of modulation symbol sequences further modifies the signal parameters to optimize both PAPR and resource allocation efficiency simultaneously
Solution Approach 2:
The patent introduces DFT precoding as an intermediary processing step between modulation and transmission. This intermediary transformation enables the system to achieve lower PAPR while maintaining efficient resource allocation by acting as a bridge between the control information and the physical channel
2Productivity
If multiple control information are transmitted separately, then each can be processed independently, but the overall transmission efficiency is reduced
Solution Approach 1:
The patent merges multiple control information into a single codeword through joint coding. This combining approach improves transmission efficiency by enabling unified processing and resource allocation, while the systematic joint coding method keeps the complexity manageable through standardized procedures
Data Source
AI summary
A method for transmitting control information via a PUCCH in a wireless communication system and an apparatus for performing the method are provided, the method including joint-coding a plurality of pieces of control information to obtain a single code word; obtaining a first modulated symbol sequence from the single code word; obtaining a plurality of second modulated symbol sequences corresponding to each slot in the PUCCH from the first modulated symbol sequence; cyclically shifting the plurality of second modulated symbol sequences in a time domain to obtain a plurality of third modulated symbol sequences; performing a Discrete Fourier Transform (DFT) precoding process on the plurality of third modulated symbol sequences to obtain a plurality of complex symbol sequences in a frequency domain; and transmitting the plurality of complex symbol sequences via the PUCCH.