Multi-path Acquisition Signal Cancellation for High Data Rate Interference
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Solution Overview
Problem
In multi-user wireless communication environments, the presence of high data rate users (e.g., Release 6 UMTS users) causes increased interference, degrading multi-path acquisition performance for lower data rate users (e.g., Release 4/5 UMTS users).
Innovation Solution
A method and apparatus that estimate and cancel the contribution of high data rate users' signals from the received signal to generate a resultant signal, allowing for improved multi-path acquisition for both high and low data rate users by using a cancellation unit and multi-path acquisition unit to process the resultant signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high data rate users (Release 6) are served in the wireless communication system, then the data rate for these users is improved, but interference increases and multi-path acquisition performance for legacy users (Release 4/5) deteriorates
Solution Approach 1:
The patent extracts and separates the signal contribution from high data rate users (Release 6) from the composite received signal. By identifying and isolating the enhanced dedicated physical channel (E-DPDCH) components, the system removes the interfering signal portion, allowing legacy users' signals to be acquired without degradation from high data rate user interference.
Solution Approach 2:
The received signal is segmented into distinct user contributions - specifically separating Release 6 users from Release 4/5 users. The patent divides the multi-user signal into individual user signals based on their different channel structures and signal characteristics, enabling independent processing and acquisition for each user type without mutual interference.
2Adaptability or versatility
If multiple user types (Release 6 and Release 4/5) share the same wireless communication channel, then system capacity and versatility are improved, but signal interference increases and detection precision deteriorates
Solution Approach 1:
The patent introduces an intermediary processing stage between signal reception and multi-path acquisition. This intermediary involves estimating individual user signals, canceling their contributions from the composite signal, and then performing acquisition on the cleaned signal. This mediator process eliminates interference while preserving the ability to serve multiple user types simultaneously.
3Device complexity
If conventional multi-path acquisition is used in the presence of high data rate users, then device complexity is kept simple, but acquisition performance for legacy users deteriorates due to interference
Solution Approach 1:
The patent performs preliminary signal estimation and cancellation before the multi-path acquisition process. By pre-removing the interfering high data rate user signals from the received signal, the subsequent acquisition process operates on a cleaner signal with reduced interference, improving legacy user detection without requiring fundamentally new acquisition algorithms.
Data Source
AI summary
A method of multi-path acquisition may include estimating a contribution of acquired users of a first type to a received signal, canceling the estimated contribution from the received signal to generate a resultant signal, and performing multi-path acquisition for users of the first type and users of a second type based on the resultant signal.