OFDM Channel Estimation Using TPS Carriers Under Pilot Loss
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Solution Overview
Problem
DVB systems using OFDM face challenges in obtaining reliable channel estimates due to poorly behaved channels, which lead to inaccurate interpolation of channel conditions for data carriers when pilots are corrupted by fading, multi-path, noise, and interference.
Innovation Solution
A receiver system that includes a demodulator, channel estimators for TPS and pilot carriers, and an interpolator to determine channel estimates for data carriers using non-linear interpolation mechanisms, leveraging TPS carriers to enhance channel estimation even when scattered or continuous pilots are lost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pilot-based channel estimation is used in DVB-OFDM systems, then channel estimates can be obtained under normal conditions, but the estimates become unreliable when pilots are corrupted by fading, multi-path, noise, and interference
Solution Approach 1:
The patent introduces TPS carriers as intermediary elements to mediate channel estimation when traditional pilots fail. The TPS carriers serve as alternative reference signals that can provide reliable channel information even when scattered and continuous pilots are corrupted by channel impairments. The channel estimator uses TPS carriers to generate channel estimates that can then be interpolated to data carriers, ensuring continuous reliable operation.
Solution Approach 2:
The patent changes the reference signal parameter from traditional pilots to TPS carriers. By switching to TPS carriers as the reference signal source, the system can maintain accurate channel estimation under deteriorating channel conditions where traditional pilots fail. This parameter change allows the system to adapt to poor channel conditions while maintaining measurement precision.
2Measurement precision
If scattered and continuous pilots are used for channel estimation, then channel conditions can be monitored, but interpolation accuracy deteriorates when pilots are lost due to channel deterioration
Solution Approach 1:
TPS carriers act as intermediary reference signals that replace failed pilot-based channel estimates. When scattered and continuous pilots are lost, the TPS carriers provide an alternative source of channel information that can be interpolated to data carriers, ensuring reliable channel condition monitoring even when traditional pilots fail.
Solution Approach 2:
The system prepares TPS carriers as a backup reference signal source in advance, cushioning against the failure of scattered and continuous pilots. This prior preparation ensures that when pilots are lost due to channel deterioration, the system already has alternative reference signals ready to maintain interpolation reliability.
3Productivity
If conventional modulation schemes are used on multiple carriers, then data transmission can be performed, but decoding accuracy decreases in deteriorating channel conditions
Solution Approach 1:
TPS carriers serve as intermediary reference signals that enable accurate decoding of data carriers in deteriorating channel conditions. By using TPS carriers to generate channel estimates that are then applied to data carrier decoding, the system maintains decoding accuracy even when channel conditions deteriorate, while continuing to transmit data on multiple carriers.
Data Source
AI summary
Methods and apparatus, including computer program products, are provided for channel estimation. In one aspect, there is provided a receiver including a demodulator for decoding a signal including at least one of a transmission parameter signaling (TPS) carrier and a data carrier. The receiver further includes a channel estimator, coupled to the demodulator, for determining a channel estimate for the TPS carrier. Moreover, the receiver includes an interpolator, coupled to the channel estimator, for determining, based on the determined channel estimate for the TPS carrier, another channel estimate for the data carrier. Related systems, methods, and articles of manufacture are also disclosed.