Transmitter Device for Low Peak-to-Average Power Ratio Control Data
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Solution Overview
Problem
Current mobile communication systems face challenges in transmitting control data with low Peak-to-Average Power Ratio (PAPR), especially in 5G NR systems, where existing solutions generate interference and require complex decoding algorithms, and existing decoding methods are sub-optimal, especially at low signal-to-noise ratios.
Innovation Solution
A transmitter device and method that determine a sequence of low peak-to-average power ratio vectors and combine them with an outer code sequence for single-carrier or multicarrier modulation, minimizing PAPR and enabling correct detection even in extreme coverage scenarios without using DMRS signals, applicable to payload lengths up to 16 bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If peak windowing, scaling, or clipping is used to reduce PAPR, then PAPR is reduced, but interference and distortions are generated in the OFDM modulated signal requiring further filtering
Solution Approach 1:
The patent changes the fundamental parameter of the transmission approach by using single-carrier or multicarrier modulation instead of conventional OFDM modulation. This parameter change inherently produces signals with lower PAPR without generating the interference and distortions that would require filtering, thus resolving the contradiction between PAPR reduction and harmful factor generation.
2Device complexity
If sub-optimal reduced-complexity decoding algorithms are used for control channel formats, then decoding complexity is reduced, but detection accuracy deteriorates especially at low signal-to-noise ratios
Solution Approach 1:
The patent applies preliminary action by performing structured coding and sequence selection before transmission. The transmitter prepares the control data with specific sequences and coding structures that enable the receiver to achieve optimal detection accuracy without requiring complex decoding algorithms. This preliminary structuring of the signal allows simple receivers to achieve high detection accuracy, resolving the contradiction between decoding complexity and detection accuracy.
Data Source
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AI summary
There is provided a transmitter device (1) for transmitting a digital input message corresponding to control data used in a control channel (such as PUCCH, PRACH, PUSCH) through a communication channel, the transmitter device comprising a set of transmit antennas, the message m comprising a number B of bits. The transmitter device (1) comprises: - a sequence selector (102) configured to determine, from the B channel bits, a sequence, associated with a sequence index, comprising a set of low peak-to-average power ratio (PAPR) vectors (rl(m))depending on the message and on the sequence index; - a code sequence generator (103) configured to generate an outer code sequence (wl(m)) from said B channel bits; - a combiner (104) configured to combine the sequence of low peak-to-average power ratio vectors (rl(m)) with the outer code sequence (wl(m)). The transmitter device (1) comprises a modulator for each transmit antenna configured to apply single carrier or multicarrier modulation to the combined sequence, the transmitter device being configured to transmit the modulated combined sequence over the communication channel using said transmit antennas.