MIMO Inter-Polarization Interleaver for BER Stability
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Solution Overview
Problem
Conventional SDM-MIMO transmission systems face challenges in maintaining stable signal reception due to differences in signal reception levels among antennas, leading to deteriorated overall bit error rates and reduced receivable areas.
Innovation Solution
The implementation of inter-polarization interleaving and deinterleaving processes between transmit and receive antennas in a MIMO system, along with time and frequency interleaving, to distribute errors uniformly and improve error correction capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate streams are transmitted through multiple antennas in SDM-MIMO system, then data transmission capacity is increased, but overall bit error rate deteriorates when reception levels differ among antennas
Solution Approach 1:
The transmission data is divided into multiple segments and distributed to different antennas for transmission. The segmentation unit is dynamically adjusted based on reception levels of each antenna, allowing data to be分段 transmitted through multiple paths while maintaining overall system reliability despite varying antenna performance
Solution Approach 2:
Different segments of transmission data are assigned to different antennas based on their individual reception characteristics. Antennas with better reception levels handle more critical or higher-order modulated segments, while antennas with poorer reception handle more robustly encoded segments, optimizing the overall bit error rate
2Reliability
If bit interleaving is applied in units of each transmitter, then error correction capability is improved, but device complexity increases
Solution Approach 1:
The bit interleaving operations across multiple transmitters are merged into a unified interleaving process. Instead of each transmitter independently performing bit interleaving, a single interleaving operation is applied to the combined data stream from all transmitters, reducing processing complexity while maintaining error correction capability
Solution Approach 2:
A universal interleaving scheme is implemented that works across all transmitters simultaneously. The same interleaving algorithm and structure are applied regardless of the number of transmitters or their individual characteristics, simplifying the system design and reducing the complexity of implementing transmitter-specific interleaving operations
Data Source
AI summary
Disclosed is a MIMO system including a transmitter and a receiver, in which an overall BER characteristic is improved. The transmitter (1) maps data, distributed among transmit antennas, onto an IQ plane to generate carrier symbols, and then, applies an inter-polarization interleave processing in a time direction to the carrier symbols between the transmit antennas, to generate OFDM signals. Receiving the OFDM signals, the receiver (2) demodulates the OFDM signals to generate complex baseband signals, and after that, applies a first deinterleave processing in a time direction to the complex baseband signals to generate time deinterleaved data. Further, the receiver (2) applies a MIMO separation processing to the time deinterleaved data to generate a plurality of sets of MIMO separated data and applies a second deinterleave processing between the receive antennas to the plurality of sets of MIMO separated data, so as to generate carrier symbols.