OFDM Transmitter Multiplex Segmentation for SFN Interference
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Solution Overview
Problem
In Single Frequency Network (SFN) operations, multiplexes with varying content in neighboring coverage areas interfere with each other, preventing simultaneous broadcast of entire multiplexes, particularly in digital broadcast systems like DVB-T/T2, DAB/DAB+, MBSFN, and LTE/xG systems, due to differences in data rates between audio/video and sound radio programs.
Innovation Solution
Transmitting clearly separable multiplexes in one MBSFN or eMBMS channel by separately encoding and decoding blocks for each multiplex within media broadcast subframes, allocating them to individual or groups of physical resource blocks, allowing identical multiplexes to be transmitted without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple multiplexes with different content are transmitted in SFN operation, then spectrum efficiency is improved, but interference between multiplexes occurs causing transmission reliability to deteriorate
Solution Approach 1:
The patent segments the MBSFN subframe into multiple time slots, with each slot dedicated to transmitting a specific multiplex. This temporal segmentation allows multiple multiplexes to be transmitted simultaneously without mutual interference, resolving the contradiction between spectrum efficiency and transmission reliability.
2Quantity of substance
If entire multiplexes are transmitted in SFN operation, then broadcast coverage is improved, but computing time and battery power consumption in receivers increase
Solution Approach 1:
The patent divides each multiplex into separate time slots within the MBSFN subframe. Receivers can then selectively decode only the specific multiplexes they need based on their location and interests, rather than processing entire multiplexes, thereby reducing computing time and battery power consumption while maintaining comprehensive broadcast coverage.
3Adaptability or versatility
If multiplexes with different data rates are transmitted together, then program diversity is improved, but interference between multiplexes increases
Solution Approach 1:
The patent assigns different time slots to different multiplexes with varying data rates. By separating them temporally, the system can transmit diverse programs (television, sound radio, regional content) without interference, as each multiplex occupies a distinct time slot within the MBSFN subframe.
Solution Approach 2:
The patent enables different multiplexes to be transmitted with their specific local characteristics (different data rates, content types) in dedicated time slots. Each multiplex maintains its optimal transmission parameters without being compromised by other multiplexes, allowing program diversity while preventing interference.
Data Source
AI summary
The invention relates to an OFDM-based transmitter (1000) for transmitting a multiplex (M1) of one or more radio information signals in a radio transmission mode via a transmission medium. According to the invention, the transmitter comprises an input (1002) for receiving the multiplex of radio information signals, an encoding unit (1006/1010) for encoding a block of data of the multiplex of radio information signals and for generating an encoded block of data (202), and a multiplexer unit (1012) for incorporating the encoded block of data in a media radio subframe of a radio transmission signal. According to the invention, the transmitter is furthermore designed to receive a second multiplex (M2) of one or more radio information signals. The encoder unit (1008/1010) according to the invention is furthermore designed to encode a block of data of the second multiplex of radio information signals and to generate a second encoded block of data (204), and the multiplexer unit (1012) is furthermore designed to incorporate the second encoded block of data in the same media radio subframe of tlic radio transmission signal (Sout).