Wireless Precoding for Accurate Pilot-Based Channel Estimation
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Solution Overview
Problem
Conventional wireless communication systems using SDMA schemes, such as ZF and VP, face noise enhancement and deteriorated reception performance due to the application of perturbation vectors, which complicates effective channel estimation and power normalization for both data and pilot signals.
Innovation Solution
A wireless communication apparatus that adds a perturbation vector only to the data signal and applies a common normalization coefficient to both the pilot and data signals, enabling correct effective channel estimation and reconstruction of the data signal on the reception side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a perturbation vector is added to both pilot signal and data signal, then noise enhancement is suppressed, but channel estimation accuracy deteriorates
Solution Approach 1:
The patent segments the processing of pilot signals and data signals by applying different operations: perturbation vectors are added only to data signals while pilot signals remain unchanged. This segmentation allows the receiver to accurately estimate the effective channel using the unperturbed pilot signal, while still benefiting from noise suppression through perturbation vector addition to the data signal.
2Power
If different normalization coefficients are used for pilot signal and data signal, then transmission power is optimized, but device complexity increases
Solution Approach 1:
The patent merges the normalization processing by using a common normalization coefficient for both pilot signals and data signals. This simplifies the device complexity by eliminating the need to calculate and apply separate normalization coefficients, while still allowing optimization of transmission power through the unified normalization process.
Data Source
AI summary
According to one embodiment, a wireless communication apparatus includes a perturbation vector addition unit, a weight multiplication unit and a normalization coefficient multiplication unit. The perturbation vector addition unit is configured to add a perturbation vector only to a first data signal of a first transmission signal containing a first pilot signal and the first data signal, and obtain a second transmission signal containing a second pilot signal and a second data signal. The weight multiplication unit is configured to multiply each of the second pilot signal and the second data signal by a weight for removing interference on a reception side, and obtain a third transmission signal containing a third pilot signal and a third data signal. The normalization coefficient multiplication unit is configured to multiply each of the third pilot signal and the third data signal by a common normalization coefficient for normalizing a total transmission power.