Backscatter Diversity Encoding With Fewer Load Impedances
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Solution Overview
Problem
Conventional OSTBC and QSTBC diversity schemes for active radio frequency communication do not consider the modulation characteristics of passive backscatter communication, leading to high system implementation complexity and a high probability of error detection when applied to backscatter communication.
Innovation Solution
A diversity transmission method using a target encoded codeword with a specific encoding structure, involving complex numbers or block matrices, is applied to ensure diversity gain while reducing the number of reflection coefficients required on each antenna, thereby reducing system implementation complexity and error detection probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If OSTBC or QSTBC diversity schemes are applied in backscatter communication, then diversity gain is achieved, but system implementation complexity increases and error detection probability increases
Solution Approach 1:
The patent changes the encoding structure parameters from conventional OSTBC/QSTBC to a new structure where the first generation element is the opposite number of the conjugate operation result of the first basic element, and the second generation element is the conjugate operation result of the second basic element. This parameter change in the encoding matrix structure reduces the number of reflection coefficients required while maintaining diversity gain
Solution Approach 2:
The patent extracts and eliminates redundant reflection coefficients from the encoding structure. By designing the target encoding structure with specific relationships between elements (opposite numbers and conjugate operations), unnecessary coefficients are removed, reducing system implementation complexity while preserving the essential diversity function
2Reliability
If OSTBC or QSTBC diversity schemes are applied in backscatter communication, then diversity gain is achieved, but error detection probability increases
Solution Approach 1:
The patent modifies the encoding structure parameters to reduce error detection probability. The specific relationships defined (first generation element as opposite number of conjugate of first basic element, second generation element as conjugate of second basic element) create a more robust encoding scheme that reduces errors in backscatter communication while maintaining diversity gain
3Reliability
If conventional diversity encoding structures are used, then diversity gain is achieved, but the number of load impedances required on each antenna increases
Solution Approach 1:
The patent extracts and eliminates redundant load impedances from the system by designing a compact encoding structure. The target encoding matrix structure with N=2k dimensions and specific element relationships reduces the number of reflection coefficients required on each antenna, thereby reducing the number of load impedances needed while maintaining diversity gain
Solution Approach 2:
The patent changes the encoding structure to optimize the number of load impedances. By defining the first generation element as the opposite number of the conjugate operation result of the first basic element and the second generation element as the conjugate operation result of the second basic element, the patent reduces the parameter count of reflection coefficients required
Data Source
AI summary
A diversity transmission method, a terminal, and a network-side device are provided. The diversity transmission method includes: determining, by a terminal, a target encoded codeword; and performing, by the terminal, diversity transmission based on the target encoded codeword, where the target encoded codeword meets a target encoding structure; the target encoded codeword is an encoding matrix with N×N dimensions; N=2k, and k is a positive integer; the target encoding structure includes a first basic element, a second basic element, a first generation element, and a second generation element; the first generation element is an opposite number of a conjugate operation result of the first basic element, and the second generation element is a conjugate operation result of the second basic element; and the first basic element, the second basic element, the first generation element, and the second generation element are complex numbers or block matrices.