Per-Antenna Modulation Mapping for MIMO Reception Quality
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multi-antenna communication systems, such as MIMO, face challenges in efficiently transmitting and receiving data signals at common frequencies, leading to suboptimal data reception quality and communication rates.
Innovation Solution
The proposed transmission method involves performing error correction coding on information bit strings to generate code words, and then modulating bit strings using different modulation schemes for each antenna, ensuring that the number of bits in each modulated signal corresponds to a predetermined multiple of the code word length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same modulation scheme is used for all antennas in MIMO systems, then the system implementation is simple, but the data reception quality and communication rates are suboptimal
Solution Approach 1:
The patent applies local quality by assigning different modulation schemes to different antennas based on their individual channel characteristics. Each antenna's modulation parameters (such as QPSK, 16QAM, 64QAM) are optimized independently according to the specific propagation conditions and signal quality observed on that antenna, thereby improving overall reception quality without requiring complex centralized control
2Productivity
If different modulation schemes are used for each antenna, then data reception quality and communication rates are enhanced, but the system complexity increases
Solution Approach 1:
The system employs self-service mechanisms where each antenna independently determines its optimal modulation scheme based on local channel conditions and feedback. The transmission device automatically adjusts modulation parameters for each antenna without requiring complex external coordination, enabling the system to adapt to varying channel conditions and maximize communication rates while keeping implementation complexity manageable
3Reliability
If error correction coding is applied to generate code words, then data transmission reliability is improved, but the transmission overhead increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the error correction coding rate and code word length based on channel conditions and modulation scheme requirements. The system selects appropriate coding parameters (such as LDPC code rates, puncturing patterns) to achieve the desired reliability level while minimizing the overhead introduced by error correction coding, thereby optimizing the trade-off between reliability and transmission efficiency
Data Source
AI summary
In a transmission method according to one aspect of the present disclosure, a encoder performs error correction coding on an information bit string to generate a code word. A mapper modulates a first bit string in which the number of bits is the predetermined integral multiple of (X+Y) in the code word using a first scheme, the first scheme being a set of a modulation scheme in which an X-bit string is mapped to generate a first complex signal and a modulation scheme in which a Y-bit string is mapped to generate a second complex signal, and modulates a second bit string in which the first bit string is removed from the code word using a second scheme different from the first scheme.