Transmitter Block Signal Phase Continuity
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Solution Overview
Problem
The OFDM transmission scheme faces issues with phase discontinuity between blocks, leading to increased out-of-band power and reduced transmission efficiency due to the need for a reference signal for processing like transmission path estimation and block synchronization.
Innovation Solution
A transmitter is designed with a fixed sequence generation unit, data sequence generation unit, multiplexing unit, and interpolation unit to generate and process a block signal, where the fixed sequence is divided and placed at the ends of the block, and the data sequence is placed in the middle, with interpolation processing to ensure continuous phases and reduce out-of-band power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OFDM transmission scheme is used, then transmission efficiency is improved, but out-of-band power increases due to phase discontinuity between blocks
Solution Approach 1:
The patent segments the transmission block into three parts: a first fixed sequence at the head, data in the middle, and a second fixed sequence at the tail. This segmentation allows the fixed sequences to serve as reference signals for phase continuity while maintaining data transmission efficiency, thereby resolving the contradiction between transmission efficiency and out-of-band power suppression.
Solution Approach 2:
The patent applies preliminary action by pre-placing fixed sequences at the head and tail of the transmission block before data transmission. These fixed sequences establish phase continuity in advance, preventing phase discontinuity between blocks and reducing out-of-band power while maintaining overall transmission efficiency.
2Measurement precision
If reference signal is inserted into block for transmission path estimation and block synchronization, then processing accuracy is improved, but transmission efficiency decreases
Solution Approach 1:
The patent makes the fixed sequence serve multiple functions: it acts as both a reference signal for transmission path estimation and block synchronization, and simultaneously serves as a phase continuity marker between blocks. This multi-functionality eliminates the need for separate reference signals, thereby improving transmission efficiency while maintaining processing accuracy.
Solution Approach 2:
The patent merges the reference signal function with the block structure by integrating fixed sequences into the block headers and footers. This combination allows the same signal elements to provide both synchronization/estimation functions and phase continuity, reducing overhead and improving transmission efficiency without sacrificing measurement precision.
Data Source
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AI summary
The present invention is a transmitter (10) compatible with a multicarrier block transmission scheme. The transmitter includes: a fixed sequence generation unit (14) that generates a fixed sequence; a data sequence generation unit (18) that converts data symbols into a time domain signal to generate a data signal; a multiplexing unit (15) that divides the fixed sequence into two divisions, places one of the two divisions at the head and another one of the two divisions at the tail of a block, and places a data sequence that is an output signal from the data sequence generation unit between the two divisions to generate a block signal; and an interpolation unit (16) that performs interpolation processing on the block signal.