Transmission Apparatus Phase Change Pilot Insertion
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Solution Overview
Problem
Conventional communication methods using multi-antenna systems, such as MIMO, do not adequately address the improvement of reception quality for single-stream signals in line-of-sight environments, particularly when using OFDM schemes.
Innovation Solution
A transmission apparatus and method that includes a weight combiner for precoding, a pilot inserter, and phase changers to enhance the reception quality of both single-stream and multiple-stream signals by performing precoding and phase changes on baseband signals, inserting pilot signals, and further phase changing with inserted pilot signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional MIMO transmission methods are used, then multiple-stream signal transmission is achieved, but reception quality of single-stream data is not improved
Solution Approach 1:
The system dynamically switches between different transmission modes (single-stream and multiple-stream) based on channel conditions and receiver capabilities. The phase changer applies different phase rotation patterns depending on whether single-stream or multiple-stream transmission is being performed, allowing adaptive optimization for each mode.
Solution Approach 2:
The transmission apparatus is designed to handle both single-stream and multiple-stream transmissions using the same hardware infrastructure. The weight combiner and phase changer are configured to process both transmission types, making the system universal and eliminating the need for separate dedicated systems.
2Reliability
If phase change is performed on precoding signals, then reception quality is improved, but signal processing complexity increases
Solution Approach 1:
Phase changes are applied to the precoding signals before they are transmitted over the air. By performing the phase rotation in advance at the transmitter side, the system simplifies the receiver processing requirements, as the phase information is already embedded in the transmitted signal structure.
Solution Approach 2:
The phase changer acts as an intermediary component between the weight combiner and the transmission interface. It introduces controlled phase rotations that serve as a bridge to improve signal characteristics without requiring complex processing in subsequent stages.
3Measurement precision
If pilot signals are inserted into precoding signals, then channel estimation accuracy is improved, but transmission efficiency decreases
Solution Approach 1:
Pilot signals are inserted at specific positions within the precoding signal structure rather than uniformly throughout. This localized insertion strategy provides sufficient channel estimation information at critical points while minimizing the overall overhead and preserving transmission efficiency for data carriers.
Data Source
AI summary
A precoding process is performed on a first baseband signal and a second baseband signal to generate a first precoding signal and a second precoding signal. A pilot signal is inserted into the first precoding signal and phase change is performed on the second precoding signal. A pilot signal is inserted into the phase changed second precoding signal, and phase change is further performed on the phase-changed second precoding signal with the pilot signal inserted.