Wireless Transmitter Sounding Packet Dimension Adaptation
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Solution Overview
Problem
In wireless communication systems using spatial multiplexing, beamforming becomes inefficient when the number of antennas between the transmitter and receiver differs, leading to challenges in channel estimation and transmission weight matrix computation, resulting in increased processing complexity and power consumption.
Innovation Solution
A wireless communication system that notifies the transmitter of the maximum dimension for channel estimation by the receiver, allowing the transmitter to adjust the sounding packet to match the receiver's processing capability, enabling efficient beamforming without increasing processing capacity, by using a staggered sounding packet format and cyclic shift delay to maintain transmission diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the transmitter uses full-dimensional sounding packets for channel estimation, then beamforming accuracy is improved, but the receiver's processing complexity and power consumption increase
Solution Approach 1:
The patent extracts only the necessary dimensional components of the channel matrix that the receiver can actually process. When the receiver has limited processing capability (M < N), it extracts and feeds back only the M-dimensional relevant channel information, discarding the redundant (N-M) dimensional information that would only increase processing burden without providing additional beamforming benefit.
Solution Approach 2:
The patent changes the parameter of the sounding packet dimension from the full N dimensions to a reduced Nmax dimensions (where Nmax ≤ N and Nmax ≤ M). This parameter adjustment allows the channel estimation to match the receiver's processing capability, reducing complexity while maintaining adequate beamforming accuracy for the supported number of streams.
2Reliability
If the transmitter transmits high-dimensional sounding packets, then transmission diversity is improved, but the receiver's power consumption increases
Solution Approach 1:
The patent applies partial action by transmitting sounding packets with dimension Nmax that is sufficient (but not excessive) for the receiver's processing capability. Instead of transmitting full N-dimensional sounding packets that would provide excessive diversity beyond what the receiver can utilize, the system transmits just enough dimensional information to achieve reliable communication at the supported data rate.
3Measurement precision
If the receiver increases processing capability to handle full-dimensional channel estimation, then beamforming performance is improved, but device cost and complexity increase
Solution Approach 1:
The patent implements feedback mechanisms where the receiver feeds back not only channel state information but also its processing capability parameters (M, Nmax) to the transmitter. This feedback loop enables the transmitter to adaptively adjust the sounding packet dimension to match the receiver's capabilities, ensuring optimal performance without requiring the receiver to upgrade its processing hardware.
Data Source
AI summary
A wireless communication system which performs data transmission using spatially multiplexed streams from a first terminal including N antennas to a second terminal including M antennas (N is an integer of 2 or more and M is an integer of 1 or more) is disclosed. The system includes notifying means, training means, channel matrix estimation means, beamforming information feedback means, transmission weight matrix setting means, and beamforming means.