Distributed Channel Sounding Resource Allocation for Phase Tracking
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Solution Overview
Problem
In distributed coordinated transmission scenarios, insufficient coordination between wireless transmitters leads to imperfect signal combination at the receiver, particularly over non-static and interference-prone communication channels, necessitating effective carrier frequency offset estimation and correction.
Innovation Solution
The method involves assigning non-overlapping channel sounding resources to primary and secondary wireless transmitters for transmitting non-spatial-multiplexed channel sounding signals, allowing for phase tracking and accurate carrier frequency offset estimation, which is then used to mitigate imperfections in coordination, enabling precise channel estimation and phase tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed transmission is used with multiple wireless transmitters, then transmission capacity and spectral efficiency are improved, but coordination accuracy and phase tracking precision deteriorate due to insufficient coordination over non-static channels
Solution Approach 1:
The patent segments the channel sounding resources by assigning dedicated sounding resources to each wireless transmitter. This segmentation allows each transmitter to be individually tracked for phase and frequency offset, resolving the coordination accuracy issue while maintaining the high transmission capacity enabled by distributed transmission.
2Productivity
If channel sounding resources are shared among multiple transmitters, then resource utilization efficiency is improved, but carrier frequency offset estimation accuracy deteriorates due to interference and lack of dedicated sounding signals
Solution Approach 1:
The patent extracts dedicated channel sounding resources from the shared resource pool and assigns them exclusively to each wireless transmitter. This extraction ensures that each transmitter has its own dedicated sounding signal for accurate carrier frequency offset estimation, while the patent maintains efficient resource utilization by reusing these dedicated resources across multiple transmission opportunities.
3Productivity
If spatial multiplexing is applied to transmit multiple data streams, then data transmission rate is improved, but phase tracking accuracy deteriorates due to interference between spatial streams
Solution Approach 1:
The patent segments the channel sounding process from the data transmission process by using dedicated non-spatial-multiplexed sounding resources. This allows spatial multiplexing to be applied to data streams while maintaining separate, interference-free phase tracking channels through the dedicated sounding resources.
4Device complexity
If wireless transmitters operate independently without full coordination, then system complexity is reduced, but signal combination quality at receiver deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where each wireless transmitter transmits dedicated channel sounding signals that enable the receiver to estimate individual transmitter characteristics. This feedback information is then used to adjust and coordinate the transmitted signals, improving signal combination quality while maintaining relatively simple independent transmitter operation.
Data Source
AI summary
A method for a primary wireless transmitter is disclosed. The primary wireless transmitter is configured to participate in transmission to a wireless receiver using spatial multiplexing in coordination with one or more secondary wireless transmitters. The method comprises assigning—from a collection of available channel sounding resources—respective channel sounding resources to the primary wireless transmitter and to the one or more secondary wireless transmitters, wherein each available channel sounding resource is assigned to at most one of the wireless transmitters. Each assigned respective channel sounding resource is for transmission of a respective non-spatial-multiplexed first channel sounding signal, and the first channel sounding signals are for phase tracking of signals transmitted by the primary wireless transmitter and/or for phase tracking of signals transmitted by the one or more secondary wireless transmitters. The method also comprises transmitting, to the one or more secondary wireless transmitters, information indicative of the respective channel sounding resources assigned to the one or more secondary wireless transmitters. Methods for the secondary wireless transmitters and the wireless receiver are also disclosed, as well as corresponding apparatuses, transmitter, receiver, access point, user station, control node, and computer program product.