Phase Rotation Symbol Mapper for Wireless Transmission
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Solution Overview
Problem
Existing wireless communication systems, particularly in WBANs, face challenges in achieving low power consumption and high data communication speed due to limitations in reception performance and spectrum distortion from non-linear elements, which hinder efficient data transmission between implant devices within the human body.
Innovation Solution
A transmission device and method utilizing a serial-to-parallel converter and phase rotation symbol mapper to convert input serial bit streams into symbols with phase rotation characteristics, combined with upsampling, filtering, and quadrature modulation, along with a reception device and method for signal detection, to enhance power efficiency and reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If phase shift keying is used for wireless communication, then spectrum efficiency is improved, but power consumption cannot be reduced due to spectrum distortion from non-linear elements
Solution Approach 1:
The patent changes the modulation parameter from conventional phase shift keying to a scheme where three bits are mapped to one symbol with phase rotation characteristics. This parameter change in the mapping relationship reduces spectrum distortion while maintaining spectrum efficiency, thereby enabling lower power consumption in wireless communication systems.
2Productivity
If phase shift keying is used, then spectrum efficiency is improved, but reception performance is limited which hinders high speed data transmission
Solution Approach 1:
The patent modifies the modulation scheme by mapping three bits to one symbol with specific phase rotation characteristics, changing the parameter structure to simultaneously improve reception performance while maintaining spectrum efficiency, thus enabling high speed data transmission with reliable reception.
3Device complexity
If non-linear elements are used in phase shift keying, then device complexity is reduced, but spectrum distortion occurs which limits power efficiency
Solution Approach 1:
The patent changes the mapping parameter from conventional schemes to a three-bit-to-one-symbol mapping with phase rotation characteristics. This parameter change reduces spectrum distortion caused by non-linear elements, improving power efficiency while maintaining device complexity at acceptable levels.
Data Source
AI summary
A transmission device for transmitting a signal in a wireless communication system is provided. The transmission device includes: a serial-to-parallel converter configured to convert an input serial bit stream into a parallel bit stream having three bits; and a phase rotation symbol mapper configured to map the parallel bit stream to a symbol having phase rotation characteristics, wherein when the parallel bit stream includes first to third bits, the phase rotation symbol mapper maps the second and third bits to a complex variable and sequentially maps a real number part and an imaginary number part of the complex variable to the front part and the rear part of a symbol in this order or to the rear part and the front part of the symbol in this order.