MIMO Spectrum Division for Antenna Diversity
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Solution Overview
Problem
In SU-MIMO single carrier transmission, poor channel state of one antenna can lead to incorrect decoding and decreased throughput due to lack of transmission antenna diversity.
Innovation Solution
A MIMO system with multiple antennas that performs precoding and spectrum division, allowing for transmission antenna diversity by dividing and transmitting spectrums from different antennas, and includes error correction coding and modulation to enhance user throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single carrier transmission is used with SU-MIMO, then transmission antenna diversity can be achieved, but poor channel state of one antenna leads to incorrect decoding and decreased throughput
Solution Approach 1:
The patent segments the frequency spectrum into multiple subcarriers and distributes them across multiple antennas. Each antenna transmits a different subset of subcarriers, so that even if one antenna has poor channel state, other antennas can still transmit data reliably. This spectral segmentation enables diversity gain while maintaining robustness against individual antenna failures.
Solution Approach 2:
The patent combines signals from multiple antennas at the receiver end through MIMO separation processing. By merging the signals from multiple antennas with different channel conditions, the system achieves diversity gain and improves decoding correctness. The receiver combines the information from all antennas to reconstruct the original signal, compensating for poor channel conditions in individual antennas.
2Reliability
If spectrum is divided and transmitted from different antennas, then transmission antenna diversity is achieved, but system complexity increases
Solution Approach 1:
The spectrum is segmented into multiple subcarriers that are distributed across multiple antennas. This segmentation is implemented through frequency-domain processing, which is computationally efficient. The base station divides the available spectrum resources and assigns different subcarrier sets to different antennas, achieving diversity without requiring complex time-domain processing.
Solution Approach 2:
The patent transitions from single-carrier time-domain transmission to multi-carrier frequency-domain transmission. By moving the diversity mechanism from the time domain to the frequency domain, the system achieves transmission antenna diversity through spectral distribution rather than temporal spreading, reducing processing complexity while maintaining diversity benefits.
Data Source
AI summary
In SU-MIMO, even when the channel state of one antenna is poor, an error ratio is improved by obtaining a transmission antenna diversity effect. A transmission apparatus 100 that has a plurality of antennas 108-1 to 108-Ntx and transmits a signal according to a MIMO (Multiple Input Multiple Output) system includes a DFT part 111 for precoding transmission data and a spectrum division part 112 for dividing a spectrum output from the DFT part 111. The divided spectrums are transmitted from the different antennas 108-1 to 108-Ntx, respectively.