Two-Dimensional Symbol Transmission for Spectral Efficiency
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Solution Overview
Problem
Existing data modulation techniques, such as DPSK, face challenges in improving spectral utilization, as they rely solely on phase differences for data transmission, which can be inefficient in carrying information.
Innovation Solution
A method and device for symbol transmission and reception that determine transmission symbols based on both the amplitude and phase of previous symbols, along with additional bits, to enhance spectral efficiency by carrying more information bits with fewer transmission symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DPSK modulation is used relying solely on phase difference, then transmission can be performed in the presence of phase noise and frequency bias, but spectral utilization is insufficient
Solution Approach 1:
The patent transitions from one-dimensional phase difference modulation to two-dimensional modulation by incorporating both phase and amplitude dimensions. Each symbol now carries information through both phase offset and amplitude ratio, effectively adding another dimension for information encoding, which resolves the contradiction by maintaining reliability through phase modulation while improving spectral utilization through amplitude modulation.
Solution Approach 2:
The patent creates a composite modulation scheme that combines DPSK (phase difference modulation) with amplitude modulation. This composite approach integrates the reliability benefits of phase-based modulation with the spectral efficiency of amplitude-based modulation, allowing the system to achieve both transmission reliability in noisy environments and improved spectral utilization.
2Device complexity
If only phase difference is used to carry information, then implementation is simple, but information carrying capacity is limited
Solution Approach 1:
The patent adds the amplitude dimension to the existing phase dimension, creating a two-dimensional information carrier. The phase offset continues to provide one dimension of information while the amplitude ratio provides a second dimension, effectively doubling the information carrying capacity per symbol without substantially increasing implementation complexity.
Solution Approach 2:
The patent makes the modulation system multi-functional by enabling it to carry information through both phase and amplitude variations. This universal approach allows the same modulation framework to encode multiple bits per symbol, increasing information capacity while maintaining a unified and manageable implementation structure.
Data Source
AI summary
A symbol sending method, a symbol receiving method, a sending device, a receiving device, and a storage medium are disclosed. The method for symbol transmission may include determining, N+1 transmission symbols of s0, s1, s2, . . . sN, according to a reference symbol and (M+1)*N bits, where 0, 1, 2, . . . , N denote indices of the transmission symbols, s0 denotes the reference symbol; a transmission symbol indexed n is determined according to an amplitude and a phase of a transmission symbol indexed n−1, and M+1 bits, and M is an integer greater than or equal to 1, N is an integer greater than or equal to 1, 1≤n≤N, n is an integer; and transmitting the N+1 transmission symbols.