OFDM Pilot Tone Insertion Pattern Adaptation
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Solution Overview
Problem
Conventional OFDM systems in DVB-T transmission maintain a fixed pilot tone insertion pattern, leading to unnecessary reduction in data transmission rate even when the communication environment is static, as they do not adaptively adjust the pilot insertion pattern based on the environment or data transmission requirements.
Innovation Solution
The system adaptively selects a pilot insertion pattern based on the communication environment, adjusting the number and placement of pilot tones to optimize data transmission rate, allowing for variable data transmission rates while maintaining compatibility with conventional systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pilot tones are frequently inserted into OFDM symbols to enable rapid channel estimation updates for mobile reception, then reception reliability is improved, but data transmission rate is reduced
Solution Approach 1:
The patent applies dynamics by making the pilot insertion pattern variable rather than fixed. The system dynamically adjusts the pilot insertion pattern based on reception device mobility characteristics, selecting from multiple predefined patterns (first pattern for mobile devices with frequent pilot insertion, second pattern for fixed devices with reduced pilot insertion). This resolves the contradiction by adapting pilot insertion frequency to actual channel conditions, maintaining reception reliability for mobile devices while improving data transmission rate for fixed devices.
2Device complexity
If pilot tones are inserted according to a fixed insertion pattern in conventional DVB-T systems, then system simplicity is maintained, but data transmission efficiency is reduced unnecessarily in static environments
Solution Approach 1:
The patent introduces dynamic adaptability by enabling the system to select from multiple pilot insertion patterns based on reception device characteristics. While the system structure remains relatively simple with predefined patterns, it dynamically adapts pilot insertion behavior to environmental conditions, thereby improving data transmission efficiency in static environments without significantly increasing system complexity.
Solution Approach 2:
The patent changes the parameter of pilot insertion pattern selection based on reception device mobility characteristics. By varying which predefined pattern is applied (first pattern for mobile, second pattern for fixed devices), the system optimizes data transmission efficiency for different scenarios while maintaining overall system simplicity through the use of predefined patterns rather than completely adaptive algorithms.
3Ease of manufacture
If the same pilot insertion pattern is used for both mobile and fixed reception devices, then system implementation is simplified, but data transmission rate is unnecessarily reduced for fixed devices
Solution Approach 1:
The patent applies dynamics by implementing conditional selection of pilot insertion patterns based on reception device type. The system maintains simplicity through predefined patterns but introduces dynamic adaptation by selecting the first pattern for mobile devices and the second pattern for fixed devices, thereby optimizing data transmission rate for fixed devices without significantly complicating system implementation.
Solution Approach 2:
The patent applies local quality by tailoring the pilot insertion pattern to the specific characteristics of different reception devices. Mobile devices receive the first pattern with higher pilot insertion frequency suitable for their mobility characteristics, while fixed devices receive the second pattern with reduced pilot insertion. This localized optimization improves data transmission rate for fixed devices while maintaining appropriate reception reliability for mobile devices.
Data Source
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AI summary
An OFDM transmission apparatus is provided which transmits OFDM symbols to at least one reception apparatus. The apparatus includes an OFDM transmission processing unit which generates a plurality of OFDM symbols, a pilot insertion unit which inserts a pilot into each OFDM symbol, and a control unit which controls the pilot insertion unit to insert the pilot according to a pilot insertion pattern which is determined to correspond to a communication environment from among a plurality of pilot insertion patterns. Therefore, a data transmission rate adopted to the communication environment can be obtained.