Programmable Interference Suppression Module for WCDMA
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Solution Overview
Problem
In WCDMA communication systems, multiple access interference (MAI) and multipath interference significantly hinder the ability of mobile communication devices to decode desired signals, as they receive signal energy from other devices and experience dispersed signals with different propagation paths, leading to noise that interferes with successful communication.
Innovation Solution
A programmable interference suppression module is implemented, which generates estimated channel state information to attenuate undesired signals, using a method that includes iterative weighting and addback iterations, and is integrated into a communication device's interference cancellation module to suppress both inter-cell and intra-cell interference, particularly from non-listened base transceiver stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple digital signals are transmitted concurrently via a common RF channel using WCDMA technology, then RF frequency spectrum utilization is increased and more users can communicate concurrently, but multiple access interference (MAI) and multipath interference significantly increase, hindering the ability of mobile communication devices to decode desired signals
Solution Approach 1:
The patent converts the harmful MAI into a useful signal by estimating and reconstructing the interference components from other users' signals. The interference cancellation module uses channel state information and spreading codes to generate estimates of MAI and multipath interference, then subtracts these estimates from the received signal to produce a cleaned signal for decoding. This transforms the harmful interference into a beneficial preprocessing step that enhances signal quality.
Solution Approach 2:
The patent performs preliminary interference estimation and cancellation before the actual signal decoding process. The system pre-processes the received signal by estimating channel state information, generating interference components from known spreading codes and channel estimates, and subtracting these interference components from the received signal before passing it to the decoder. This preliminary action removes interference ahead of time, making the subsequent decoding more reliable.
2Reliability
If mobile communication devices receive signals from multiple base transceiver stations concurrently, then network coverage and service availability are improved, but the aggregate noise signal energy level from other devices increases in proportion to the number of other mobile communication devices
Solution Approach 1:
The patent implements an iterative feedback mechanism where the system estimates channel state information, generates interference estimates, cancels interference from the received signal, decodes the signal, and then uses the decoded signal to refine subsequent interference estimates. This feedback loop continuously improves the accuracy of interference cancellation by using information from previous decoding attempts to better estimate and remove interference in subsequent iterations.
Data Source
AI summary
Aspects of a method and system for a programmable interference suppression module may include receiving a communication signal comprising one or more desired signal, and one or more undesired signals. The communication signal may be utilized to generate estimated channel state information. The estimated channel state information may be formatted for use in interference suppression. A reduced interference signal may be generated from a delayed version of said communications signal and the estimated channel state information, wherein the one or more undesired signals may be attenuated. The reduced interference signal may be formatted for post-processing. The desired signals may comprise WCDMA and/or HSDPA signals, and the undesired signals may be inter-cell and/or intra-cell interference. Further processing may comprise HSDPA processing and/or RAKE finger processing. The communication signal may be a Universal Mobile Telecommunication System (UMTS) compliant signal.