Space-Time Coding Using Galois Fields for Multi-Antenna Correlation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In mobile communication systems, existing space-time coding technologies face challenges in maintaining high reliability and efficiency due to errors caused by multipath interference, fading, and lack of correlation between signals transmitted via multiple antennas, particularly in systems using three or more transmission antennas.
Innovation Solution
A space-time coding apparatus and method that converts non-binary symbols into a stream of binary bits using a de-mapper and distributes these bits across multiple antennas, increasing correlation and error correction by employing a Galois field for encoding and decoding, thereby enhancing HARQ efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If space-time coding is used with multiple transmission antennas to reduce error rates, then reliability is improved, but correlation between signals transmitted via multiple antennas is insufficient leading to reduced efficiency
Solution Approach 1:
The patent extends space-time coding from traditional binary fields to non-binary Galois fields (GF(2^m)), adding a mathematical dimension to the coding scheme. This allows signals transmitted via multiple antennas to maintain stronger correlation while achieving diversity gain, thereby improving both reliability and efficiency simultaneously
Solution Approach 2:
The invention changes the fundamental parameter of the coding field from binary (GF(2)) to non-binary (GF(2^m)). This parameter change enables the system to achieve better signal correlation across multiple antennas while maintaining error correction capabilities, resolving the contradiction between reliability and transmission efficiency
2Ease of manufacture
If conventional binary space-time coding is used, then implementation is simple, but error correction capability is insufficient for high-speed mobile communication
Solution Approach 1:
The patent transitions from binary coding parameters to non-binary Galois field parameters (GF(2^m)), enhancing error correction capability while maintaining a systematic coding structure that remains implementable through structured mapping and distribution processes
3Reliability
If more transmission antennas are added to improve reliability, then diversity gain increases, but signal correlation between antennas decreases leading to lower system efficiency
Solution Approach 1:
By extending the coding space to non-binary Galois fields, the patent enables the system to maintain strong signal correlation even when using three or more transmission antennas. The non-binary coding structure provides an additional mathematical dimension that preserves signal relationships across multiple antenna paths, allowing diversity gain to increase without sacrificing system efficiency
Data Source
AI summary
Disclosed is a space-time coding apparatus in a mobile communication system. The space-time coding apparatus includes a de-mapper for converting a non-binary symbol into a stream of m×a binary bits, and transmits the stream of binary bits output from the de-mapper via a plurality of antennas. The number of the antennas is m, and a distributor separately distributes the m×a binary bits to the m antennas.