Digital Radio Receiver Signal Validation Using Soft Bit Ratios
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Solution Overview
Problem
In LTE networks, especially those supporting IoT devices, the blind decoding process for downlink control channels often results in a high number of false positives, leading to unnecessary power consumption as devices continuously monitor for control or data channel transmissions even when none are intended for them.
Innovation Solution
A method and digital radio receiver that calculate linear combinations of soft bits from different subsets of a rate de-matching buffer, determine a ratio between these combinations, and compare it to an expected value to assess the operational state of the receiver, thereby reducing power consumption by identifying and rejecting invalid or unintended signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind decoding is continuously performed for downlink control channels, then the receiver can detect valid signals, but power consumption increases due to processing of false positives
Solution Approach 1:
The patent applies preliminary action by performing a quick validity check on received signals before committing to full decoding processing. The receiver calculates a metric based on received signal strength and compares it against a threshold to determine whether the signal is likely valid, thereby avoiding unnecessary processing of false positive signals and reducing power consumption.
Solution Approach 2:
The patent implements feedback by using the results of initial signal validation to control subsequent processing. When the validity metric indicates a false positive, the system provides feedback to stop further decoding operations. This feedback mechanism ensures that power is not wasted on processing signals that are determined to be invalid.
2Reliability
If the receiver processes all received signals through full decoding, then no valid signals are missed, but unnecessary processing of invalid signals wastes power
Solution Approach 1:
The patent applies partial action by performing only a partial validation check rather than complete decoding for every received signal. The receiver calculates a simplified metric (such as received signal strength comparison) that provides sufficient information to distinguish valid from invalid signals in many cases, avoiding the energy cost of full decoding while maintaining reliable detection.
Solution Approach 2:
The patent segments the signal processing into two distinct stages: an initial quick validation stage that checks basic signal properties, and a subsequent full decoding stage that is only activated for signals passing the initial check. This segmentation allows the system to efficiently filter out false positives before committing resources to comprehensive processing.
3Reliability
If the receiver monitors all downlink control channels continuously, then all intended transmissions are detected, but power consumption increases when monitoring channels with no transmissions
Solution Approach 1:
The patent applies preliminary action by performing a quick check on monitored channels to determine whether a transmission is present before activating full monitoring procedures. The receiver evaluates a metric such as received signal strength and only proceeds with detailed monitoring when the preliminary check indicates a likely valid transmission, thereby reducing power consumption on channels with no transmissions.
Data Source
AI summary
A digital radio receiver receives an encoded digital radio signal comprising a plurality of bits. The receiver determines a plurality of soft bits representing estimates of the bits and stores the soft bits in a rate de-matching buffer. The receiver calculates a first linear combination of soft bits from a first subset of the buffer and a second linear combination of soft bits from a second subset of the buffer. The receiver calculates a ratio between the first and second linear combinations and compares the ratio to an expected value. The receiver then determines its operational state based on the comparison.