DPSK Modulation for O/E Converter Reduction in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing the number of optical-to-electrical (O/E) converters required for signal transmission in multi-carrier systems, leading to increased complexity and potential communication quality degradation due to phase errors.
Innovation Solution
The proposed method involves transmitting signals using differential phase shift keying (DPSK) between chunks in the frequency domain, with a focus on a main chunk that includes a target frequency band of the O/E converter, reducing the need for multiple O/E converters and minimizing phase errors by applying DPSK between component carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple O/E converters are used for multi-carrier signal transmission, then signal transmission capability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple carrier signals into a single O/E converter by applying DPSK modulation across frequency chunks. Instead of requiring separate O/E converters for each carrier, the system multiplexes multiple carriers and processes them together through a single converter, reducing hardware complexity while maintaining transmission capability.
Solution Approach 2:
A single O/E converter is designed to handle multiple carrier frequencies simultaneously through DPSK modulation. The converter performs multiple functions by processing different frequency chunks (first frequency band, second frequency band, etc.) through a unified conversion process, eliminating the need for dedicated converters for each carrier.
2Productivity
If multiple O/E converters are used for multi-carrier signal transmission, then signal transmission capability is improved, but communication quality deteriorates due to phase errors
Solution Approach 1:
The patent converts the harmful phase errors introduced by O/E converters into a manageable problem through DPSK modulation. Instead of treating phase errors as complete failures, the system uses differential encoding where phase differences between consecutive symbols carry the information, making the system tolerant to absolute phase variations and converting what would be harmful errors into acceptable variations.
Solution Approach 2:
The system changes the modulation parameter from conventional QAM to DPSK, which fundamentally alters how phase information is encoded. This parameter change makes the communication system insensitive to phase errors by encoding information in phase differences rather than absolute phases, thereby maintaining communication quality even with a single O/E converter.
3Ease of operation
If DPSK is applied between frequency chunks, then decoding ease is improved, but device complexity increases
Solution Approach 1:
The frequency spectrum is segmented into multiple chunks (first frequency band, second frequency band, etc.), each handled independently through DPSK modulation. This segmentation allows the receiver to process each chunk separately, simplifying the decoding process by breaking down a complex multi-carrier signal into manageable segments that can be decoded using the same simple DPSK algorithm.
Data Source
AI summary
Disclosed are a signal transmission and reception method and device in a wireless communication system. A method for receiving a signal by a terminal in a wireless communication system according to an embodiment of the present specification comprises the steps of: receiving configuration relating to a signal which is down-converted in frequency on the basis of an O/E converter; and receiving the signal in a particular resource region on the basis of the configuration. A frequency domain of the particular resource region comprises a plurality of chunks. The chunks comprise at least one component carrier (CC). The configuration comprises information indicating a main chunk relating to differential phase shift keying (DPSK). The transmission of the signal is on the basis of the DPSK applied between the chunks in the frequency domain with respect to the main chunk.