Progressive Preamble Network Identifier Transmission
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Solution Overview
Problem
In wireless communication systems, particularly OFDM systems, there is a need to effectively transmit and receive network identifiers while addressing multipath propagation issues, which can lead to signal degradation and complexity in equalization.
Innovation Solution
The method involves transmitting and processing symbols that convey timing information and network identification information, including a portion of the identification information from one network in symbols received from another network, utilizing a processor configured for interleaving and symbol mapping to achieve efficient communication and diversity in channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network identification information is transmitted using conventional methods in OFDM systems, then the transmission can be performed, but the signal is susceptible to multipath propagation effects causing degradation and requiring complex equalization
Solution Approach 1:
The patent applies preliminary action by transmitting a preamble sequence before the actual network identification information. This preamble contains known training symbols that enable the receiver to perform channel estimation and equalization in advance, preparing the system to handle multipath effects before the critical identification data is received, thereby improving signal integrity without increasing equalization complexity during the actual data reception
2Reliability
If network identification information is transmitted in a single symbol, then the transmission is simple, but the robustness against multipath propagation is insufficient
Solution Approach 1:
The patent segments the network identification transmission into multiple components: a preamble sequence with training symbols, followed by the actual network identification information. This segmentation allows the receiver to process the preamble first for channel characterization, then use this knowledge to robustly decode the identification information, thereby improving robustness against multipath while maintaining manageable transmission structure
Solution Approach 2:
The patent employs parameter changes by utilizing different modulation schemes and coding rates for different parts of the transmission. The preamble uses robust modulation and coding to ensure reliable channel estimation, while the network identification information can use optimized parameters based on the channel conditions detected during preamble reception, thereby improving overall robustness without excessive structural complexity
3Reliability
If interleaving is not applied to the data stream, then the transmission process is simpler, but errors caused by channel degradation cannot be effectively randomized
Solution Approach 1:
The patent applies interleaving as a preliminary processing step to the network identification information before transmission. By rearranging the bits or symbols in advance according to an interleaving pattern, the system ensures that burst errors from multipath propagation are separated into isolated errors that can be more effectively corrected by the decoder, thereby achieving error randomization with moderate processing complexity
Data Source
Figure 1(A)~1(B)
Figure 2A
Figure 2B
AI summary
Method and apparatus for progressive preamble transmission in a communication system, such as a wireless system, is disclosed. In particular, a first symbol is utilized to communicate first timing information for coarse timing acquisition. A second symbol communicates first information including network identification information concerning a first network for fine timing acquisition of symbols in the first network. If a second network data is desired, a progressive or selectively utilizable third symbol communicates second information including network identification information concerning a second network. The network identification information concerning the second network includes network identification information concerning the first network to minimize processing to determine fine timing acquisition for the second network data.