DSTBC Transmitter Sync Word Mapping Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The STBC scheme faces challenges in maintaining a fixed mapping arrangement for sync words, leading to unstable reference points during automatic frequency correction in DSTBC communication, which affects communication efficiency.
Innovation Solution
A transmitter configuration is implemented where initial values for differential encoding are set based on values from the frame head to the sync word position, ensuring the signal point before the sync word becomes a specific point, allowing for a fixed mapping pattern of the sync word, even when data content changes, using serial/parallel conversion, symbol mapping, and differential encoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If differential encoding is performed with fixed initial values, then the encoding process is simple, but the mapping arrangement of sync word becomes unstable when data content changes
Solution Approach 1:
The patent applies preliminary action by performing differential encoding on the header data (from frame head to sync word position) before the actual data transmission. This preliminary encoding determines the initial values that will be used for the entire frame, ensuring that the sync word mapping arrangement is established stably before the data content is transmitted. This allows the system to maintain consistent mapping arrangements even when the data content varies.
2Adaptability or versatility
If initial values are changed according to data content, then the mapping arrangement becomes flexible, but the reference point for automatic frequency correction becomes unstable
Solution Approach 1:
The patent applies segmentation by dividing the frame into two distinct parts: the header portion (from frame head to sync word position) and the data portion (starting from sync word). The initial values are determined solely from the header portion, which is processed independently and consistently. This segmentation ensures that the reference point for automatic frequency correction remains stable and accurate, as it is based on the fixed header encoding rather than variable data content.
3Productivity
If the same initial values are used for all frames, then the processing is efficient, but the mapping arrangement cannot adapt to different data contents
Solution Approach 1:
The patent applies preliminary action by computing the initial values based on the header data of each frame before the main data transmission begins. This allows the system to efficiently process each frame by using the header information to determine the appropriate initial values, while still maintaining adaptability to different data contents. The preliminary encoding of the header ensures that the mapping arrangement is tailored to each frame's specific data content without requiring complex processing during the main data transmission.
Data Source
AI summary
In a transmitter which transmits a signal by a DSTBC scheme, communication is efficiently performed by the DSTBC scheme. In the transmitter which transmits the signal by the DSTBC scheme, a frame in which a sync word is disposed in a predetermined position subsequent to the head is used. Initial value controller (31 to 35) sets initial values of differential encoding (differential encoding unit 15) when a DSTBC encoder which processes a transmission target processes the frame on the basis of values from the head of the frame to a position before the sync word so that a signal point corresponding to the position immediately before the sync word in the DSTBC encoder which processes the transmission target becomes a specific point.