Channel State Selection for Co-Channel Interference in DVB-T Receivers
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Solution Overview
Problem
Existing DVB-T receiver technologies face performance issues in channels with frequency selective interference, such as co-channel interference, where indirect methods fail to provide accurate channel state information for low bit error rates, and direct methods perform poorly in static channels or white noise.
Innovation Solution
A method and apparatus that selectively choose between direct and indirect channel state measurement based on co-channel interference detection, using a channel state selection control signal to output either direct or indirect channel state information, generated from error signals and channel frequency response magnitudes, to enhance bit metric calculations and SNR gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If indirect channel state measurement method is used, then performance in static channels and white noise is good, but performance in channels with frequency selective interference (co-channel interference) deteriorates
Solution Approach 1:
The system dynamically switches between indirect and direct channel state measurement methods based on detected co-channel interference conditions. A channel state selection control signal is generated to select the appropriate measurement method, making the system adaptive to different channel environments rather than using a fixed approach.
Solution Approach 2:
The invention changes the measurement method parameter based on channel conditions. When co-channel interference is detected, the system switches from indirect measurement to direct measurement, and vice versa. This parameter change allows the system to optimize performance across different channel types.
2Adaptability or versatility
If direct channel state measurement method is used, then performance in channels with co-channel interference is good, but performance in static channels and white noise deteriorates
Solution Approach 1:
The system employs dynamic selection between measurement methods based on real-time detection of co-channel interference. The channel state selection control signal enables the system to adaptively choose the direct measurement method when interference is present and indirect measurement when channels are static or have white noise, optimizing reliability across conditions.
Solution Approach 2:
The measurement approach parameter is changed based on detected channel conditions. The system switches between direct and indirect measurement methods to maintain high reliability across different channel environments, using parameter changes to adapt to varying interference levels.
3Device complexity
If a single channel state measurement method is used, then device complexity is low, but measurement precision deteriorates under varying channel conditions
Solution Approach 1:
The system uses dynamic method selection to maintain measurement precision without significantly increasing complexity. By switching between indirect and direct measurement methods based on channel conditions, the system achieves high precision across varying environments while keeping the overall structure relatively simple through standardized processing paths.
Solution Approach 2:
The measurement precision is maintained by changing the measurement method parameter based on channel conditions. The system selects the appropriate method (direct or indirect) to ensure accurate channel state information while avoiding the need for complex hybrid measurement structures.
Data Source
AI summary
A method an apparatus for providing channel state information in a receiver are described. In the method, direct channel state information may be generated based on a calculated error signal, and indirect channel state information may be generated based on a magnitude of a channel frequency response. A channel state selection control signal is generated based on the calculated error signal and magnitude of the channel frequency response. One of the direct channel state information and indirect channel state information may be output based on a logic state of the channel state selection control signal.