Reference Signal Pattern for Filtering-Based Carrier Modulation
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Solution Overview
Problem
Filtering-based OFDM techniques face challenges in 5G scenarios due to high storage requirements and complex channel estimation, particularly in IoT and MTC scenarios, where the design of time domain filters for different subband bandwidths increases resource usage and system complexity.
Innovation Solution
A signal transmitting and receiving method that determines a reference signal pattern for each subband, transmitting this information to the receiver, and using reference signals for estimating the frequency domain response of the equivalent channel, reducing the need to store time domain filter properties and simplifying channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time domain filters are designed for different subband bandwidths in filtering-based OFDM, then channel estimation accuracy is improved, but storage requirements and system complexity increase
Solution Approach 1:
The patent extracts the time domain filter properties from the receiver and relocates them to the transmitter. The transmitter determines reference signal patterns based on filter properties and transmits this information to the receiver, eliminating the need for the receiver to store filter properties. This resolves the contradiction by maintaining estimation accuracy while reducing receiver complexity and storage requirements.
Solution Approach 2:
The patent introduces reference signal pattern information as an intermediary between the transmitter and receiver. This intermediary carries the necessary filter-related information from the transmitter to the receiver, enabling accurate channel estimation without requiring the receiver to store filter properties, thus resolving the storage vs. accuracy contradiction.
2Measurement precision
If time domain filters are designed for different subband bandwidths in filtering-based OFDM, then channel estimation accuracy is improved, but storage requirements increase
Solution Approach 1:
The patent extracts the filter property information from the receiver's storage requirements and relocates it to the transmitter's processing functions. The transmitter determines reference signal patterns based on filter properties and transmits this information, eliminating the need for receiver storage of filter properties while maintaining estimation accuracy.
Solution Approach 2:
The patent creates a copy of the filter property information in the form of reference signal pattern data at the transmitter, which is then transmitted to the receiver. This allows the receiver to obtain necessary filter-related information without storing the actual filter properties, reducing storage requirements while maintaining estimation accuracy.
Data Source
AI summary
A method of signal transmitting in a filtering-based carrier modulation system, includes determining, by a transmitter, a reference signal pattern for each subband of an available frequency band of a system, and transmitting reference signal pattern information to a receiver, inserting, by the transmitter, reference signals on corresponding time-frequency resources according to the reference signal pattern of each subband, performing a carrier modulation and time domain filtering to data signals and the reference signals, and transmitting a processed signal of each subband, wherein the reference signals are used for estimating a frequency domain response of an equivalent channel consisting of a time domain filter and a physical channel from the transmitter to the receiver. The present disclosure also provides a receiving method, a transmitter and a receiver. According to the present disclosure, the storage requirement and detecting complexity of the receiver may be decreased greatly.