Transmission Device Phase Continuity Pilot Insertion
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Solution Overview
Problem
In single carrier block transmission systems, the insertion of pilot symbols leads to phase discontinuity between blocks, resulting in an increase in out-of-band spectrum interference.
Innovation Solution
A transmission apparatus is designed with a data-block generating unit and a pilot-block generating unit that incorporate fixed sequence symbols, allowing for the controlled output of data blocks and pilot blocks to minimize phase discontinuity and out-of-band spectrum leakage by arranging fixed sequence symbols in a specific pattern within the blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pilot symbols are inserted into SC blocks for transmission, then the receiving apparatus can perform synchronization and channel estimation, but phase discontinuity occurs between SC blocks causing out-of-band spectrum increase
Solution Approach 1:
The patent divides the SC block into multiple segments and inserts fixed sequence symbols at specific positions (head and tail portions) of each segment. This segmentation approach maintains phase continuity across block boundaries while allowing pilot symbols to be inserted for synchronization and channel estimation functions.
Solution Approach 2:
Fixed sequence symbols are introduced as intermediary elements between data symbols and pilot symbols. These fixed sequence symbols serve as mediators that maintain phase continuity while enabling the insertion of pilot symbols for reception processing, thus resolving the conflict between synchronization needs and spectral purity.
2Object-generated harmful factors
If fixed sequence symbols are inserted at both ends of a block to suppress out-of-band spectrum, then spectral leakage is reduced, but device complexity increases due to additional processing steps
Solution Approach 1:
The patent combines the functions of out-of-band spectrum suppression and pilot symbol insertion by using fixed sequence symbols that serve dual purposes. This merging eliminates the need for separate processing stages, reducing overall device complexity while maintaining spectral purity.
Solution Approach 2:
The fixed sequence symbols perform multiple functions simultaneously: they suppress out-of-band spectrum leakage and provide a structured framework for pilot symbol insertion. This multi-functionality reduces the number of separate components needed in the transmitter, thereby reducing device complexity.
Data Source
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AI summary
A transmission apparatus includes a data-block generating unit 1 that generates and outputs a data block including fixed sequence symbols whose signal values are formed of a fixed sequence and data symbols, a pilot-block generating unit 2 that generates and outputs a pilot block including the fixed sequence symbols and pilot symbols that are fixed symbols known on a reception side, and an output control unit 3 to which the data block and the pilot block are inputted, which controls whether the data block or the pilot block is outputted.