Transmitter Phase Control for DVB-NGH SFN
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In Single Frequency Networks (SFN) for DVB-NGH, frequent phase differences between sub-carriers lead to performance deterioration in data transmission, necessitating a method to maintain phase differences below a threshold while distinguishing transmission channels.
Innovation Solution
A transmitting apparatus and method that generates frames with antenna identification information, controlling the sum of phase differences between sub-carrier groups to be below a predetermined threshold, using a signal predistortion unit and IFFT processing, and a receiving apparatus that determines phase differences based on inserted antenna identification information for channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If phase differences are given to distinguish transmission channels in eSFN, then channel identification capability is improved, but data transmission performance deteriorates when phase differences exceed threshold
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the phase difference parameter based on channel conditions. The system calculates the sum of phase differences between sub-carrier groups and compares it against a threshold value, modifying the phase difference parameter to maintain it below the threshold when necessary, thus resolving the contradiction between channel identification and transmission performance
Solution Approach 2:
The patent implements feedback mechanisms where the receiver measures the sum of phase differences and feeds this information back to the transmitter. The transmitter then adjusts the phase difference parameter based on this feedback to ensure it remains below the threshold, maintaining both channel identification capability and data transmission performance
2Adaptability or versatility
If antenna identification information is inserted to control phase differences, then channel distinction is improved, but system complexity increases
Solution Approach 1:
The patent applies local quality by inserting antenna identification information selectively in specific resource elements rather than uniformly across the entire signal. The identification information is placed in reserved tone locations, providing channel distinction capability where needed without adding complexity to the entire system structure
Solution Approach 2:
The patent uses antenna identification information as an intermediary element that mediates between the need for channel distinction and system simplicity. This intermediate information carrier enables channel identification without requiring complex signal processing modifications, resolving the contradiction by introducing a simple information element rather than complex system changes
Data Source
AI summary
A transmitting apparatus, a receiving apparatus and controlling these apparatuses with regard to antenna identification information are provided. The transmitting apparatus includes: a frame generator configured to generate a plurality of frames which include a preamble symbol and a data symbol; and a transmitter configured to group a plurality of sub-carriers for the plurality of frames into a plurality of groups, insert in the plurality of frames antenna identification information controlling a sum of phase differences between the plurality of groups, calculated based on identification information about at least one external antenna of the transmitting apparatus, to be lowered than a predetermined threshold value, and transmit the plurality of frames in which the antenna identification information is inserted.