Synchronization Channel Interference Cancellation Using Pilot Channels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless cellular communication systems, synchronization channels like PSCH and SSCH cause interference with other channels due to non-orthogonality, leading to performance degradation, especially in high-data-rate scenarios and advanced modes like 64-QAM and MIMO, despite their low power allocation.
Innovation Solution
A method utilizing the existing pilot channel, such as the CPICH, to estimate and cancel interference from synchronization channels by performing channel estimation, despreading, and power correlation, allowing for near-perfect cancellation with reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If synchronization channels (PSCH and SSCH) are transmitted without scrambling, then initial synchronization can be achieved, but interference is generated to other channels causing performance degradation
Solution Approach 1:
The patent uses the known structure and properties of synchronization channels (which cause interference) to actually cancel their interference effect. By estimating the synchronization channel signal based on pilot channel information and subtracting it from the received signal, the harmful interference is converted into a beneficial cancellation process that improves overall system performance
Solution Approach 2:
The patent introduces an intermediate cancellation signal derived from the pilot channel to mediate between the synchronization channel and other channels. This intermediary signal represents the interference component and allows for its removal without affecting the synchronization function
2Quantity of substance
If power allocation to synchronization channels is kept low, then resource efficiency is improved, but interference cancellation becomes more difficult
Solution Approach 1:
The patent performs preliminary estimation of the synchronization channel signal using the pilot channel before the actual data reception and processing. By pre-calculating the interference component based on known pilot information, the system can accurately cancel even low-power synchronization channel interference without requiring high power allocation
3Productivity
If interference cancellation processing is implemented, then performance in high-data-rate scenarios is improved, but device complexity increases
Solution Approach 1:
The system uses the existing pilot channel, which is already being transmitted and processed for other purposes, to generate the cancellation signal. This self-service approach allows the system to use its own existing resources (pilot channel) to eliminate interference, avoiding the need for additional external resources or highly complex processing structures
Solution Approach 2:
The patent makes the pilot channel serve multiple functions: its original purpose for channel estimation and additionally as a reference for generating the synchronization channel cancellation signal. This multi-functionality reduces overall system complexity by eliminating the need for separate cancellation mechanisms
Data Source
AI summary
A method, program and user equipment for wireless communication in a cellular communication system comprising a plurality of base stations. The method comprises: synchronizing to one of said the base stations using a synchronization channel transmitted from that base station; receiving a pilot channel from said base station; after synchronizing to said base station, receiving a signal from that base station; and using the pilot channel from said base station to cancel interference on said signal caused by the synchronization channel.