Beamformed Space Time Code Testing Spatial Signature
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Solution Overview
Problem
Current beamformed space time code (STC) wireless communication systems face significant performance degradation due to the lack of radio channel information between the source device and multiple antennas of the destination device, limiting the effectiveness of beamforming weights computation.
Innovation Solution
A method is introduced where a first device computes a testing spatial signature based on signals received from one antenna of a second device, allowing it to calculate beamforming weights that enhance signal strength across all antennas of the second device, thereby improving the reliability of beamformed STC systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If beamforming weights are computed using radio channel information from only one antenna of the destination device, then the system complexity is reduced, but the signal strength and reliability at other antennas of the destination device deteriorate
Solution Approach 1:
The patent creates a virtual copy of the channel information by computing a testing spatial signature that estimates the channel characteristics between the source device and other antennas of the destination device. This copying approach allows the system to use channel information from one antenna to represent and infer channel conditions for multiple antennas, thereby maintaining beamforming effectiveness without requiring direct measurement from each antenna.
Solution Approach 2:
The testing spatial signature computation acts as an intermediary process that bridges the gap between limited channel information (from one antenna) and the need for comprehensive channel knowledge (for multiple antennas). By computing spatial signatures based on received signals and applying singular value decomposition, the system generates estimated channel characteristics that mediate between the available data and the required information for optimal beamforming.
2Ease of manufacture
If beamforming weights are computed without considering channel information for multiple antennas, then the computation process is simplified, but the signal strength received at multiple antennas of the destination device is reduced
Solution Approach 1:
The patent performs preliminary computation of testing spatial signatures and beamforming weights based on available channel information before actual data transmission. By pre-computing the spatial signatures through singular value decomposition and establishing the beamforming weight vectors in advance, the system prepares optimized weighting factors that can be applied during transmission, thereby ensuring strong signal strength without complex real-time computations for each antenna.
3Ease of operation
If current beamformed STC methods are used with limited channel information, then the system implementation is simpler, but the overall system performance is significantly degraded
Solution Approach 1:
The patent implements a feedback mechanism where the receiving device sends channel information back to the transmitting device, enabling the transmitter to compute accurate beamforming weights. The system uses the received signals from the destination antenna to compute testing spatial signatures, and this computed information feeds back into the beamforming weight calculation process, creating a closed-loop system that continuously optimizes transmission based on actual channel conditions.
Data Source
AI summary
An apparatus, logic and method are provided to improve beamformed space time code (STC) wireless communication. A first device comprising a plurality of antennas receives signals at the plurality of antennas transmitted from a first antenna of a second device. A testing spatial signature for a second antenna of the second device is computed based on the signals received at the plurality of antennas of the first device from the first antenna of the second device. Using the testing spatial signature and the signals received at the plurality of antennas of the first device from the first antenna of the second device, beamforming weights are computed to be applied to a space time code signal to be transmitted from the first device to the second device via the plurality of antennas of the first device.