GFSK Data Encoding for Narrower Spectrum and Better Sensitivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing modulation techniques, such as GFSK, face challenges in reducing the spectral width of modulated signals, which affects transmission quality and sensitivity, particularly in communication channels like DECT and Bluetooth standards.
Innovation Solution
A method is introduced that transforms a binary sequence into multiple sequences of information units, allowing for a one-to-one mapping where specific units change states based on the value of the integer x, ensuring a minimum number of permutations to reduce spectral width, specifically by combining bits in GFSK modulation, thereby reducing the spectral width and secondary lobe levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If GFSK modulation is used to reduce spectral width, then spectral width is reduced, but reception sensitivity deteriorates
Solution Approach 1:
The binary sequence is segmented into multiple sequences of information units (e.g., two sequences of N bits each). This segmentation allows the data to be distributed across multiple sequences, enabling spectral shaping while maintaining the information content and improving reception sensitivity through diverse sequence representations.
Solution Approach 2:
The invention changes the parameter of information unit states from binary (2 states) to multi-state (e.g., 4 states). This parameter change increases the number of possible sequence combinations, allowing for better spectral distribution and reduced spectral width while maintaining or improving reception sensitivity through optimized sequence diversity.
2Reliability
If spectral width is reduced to improve reception sensitivity, then reception sensitivity improves, but data transmission capacity is reduced
Solution Approach 1:
The invention transitions from binary information units (2 states) to multi-state information units (e.g., 4 states), adding an additional dimension to the signal representation. This dimensional expansion allows more data to be encoded in the same spectral space, simultaneously improving reception sensitivity through spectral shaping and maintaining data transmission capacity through increased state diversity.
Solution Approach 2:
The multi-state information units serve multiple functions: they enable spectral shaping for reduced spectral width, provide diversity for improved reception sensitivity, and increase data encoding capacity. This multi-functionality resolves the contradiction by making the same signal structure serve both spectral efficiency and data capacity requirements.
3Area of stationary object
If GFSK modulation is applied, then spectral width is reduced compared to FSK, but secondary lobe levels remain high
Solution Approach 1:
The invention changes the state parameter of information units from binary to multi-state (e.g., quaternary states). This parameter change creates more diverse sequence representations that, when modulated, produce a more uniform spectral distribution, reducing both the overall spectral width and the peak levels of secondary lobes through improved spectral shaping.
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates, according to a first aspect, to a method for encoding data with a view to the transmission thereof over a communication channel, implementing a one-to-one conversion of a binary sequence of P bits representing an integer x into K sequences of N information units, wherein each unit can have a plurality of states, N being no lower than P. According to said one-to-one conversion, starting from a sequence of N information units having the same state, M information units from among the N information units are modified, in accordance with the value of the integer x, so as to adopt a different state, M being defined such that the number of permutations of M in N is at least equal to (I).