Transmission Apparatus Phase Continuity Out-of-band Leakage
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Solution Overview
Problem
Conventional SC block transmission methods experience out-of-band spectrum leakage due to discontinuous phase and amplitude between blocks, which interferes with adjacent channels and fails to meet spectral mask requirements.
Innovation Solution
Incorporating a fixed symbol arrangement and CP insertion, followed by oversampling and interpolation processing to maintain phase and amplitude continuity between blocks, thereby suppressing out-of-band spectrum leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If SC block transmission is used to suppress peak power, then transmission peak power is reduced, but out-of-band spectrum leakage occurs due to phase and amplitude discontinuity between blocks
Solution Approach 1:
The patent applies preliminary action by inserting a fixed symbol at the head position of each SC block before transmission processing. This fixed symbol serves as a preparatory measure to ensure phase and amplitude continuity between adjacent blocks, thereby preventing out-of-band spectrum leakage while maintaining the peak power suppression benefits of SC transmission
Solution Approach 2:
The patent changes the parameter arrangement within the SC block by positioning a fixed symbol with predetermined phase and amplitude at the head position. This parameter modification ensures continuous phase and amplitude transitions between blocks, effectively suppressing out-of-band spectrum leakage while preserving the low peak power characteristics
2Power
If conventional SC block transmission is used, then peak power is suppressed, but spectral mask requirements are not met due to out-of-band leakage
Solution Approach 1:
By inserting the fixed symbol at the head of each SC block as a preliminary measure, the patent ensures that phase and amplitude continuity is established before transmission. This preliminary action enables the system to meet spectral mask requirements while maintaining peak power suppression
Solution Approach 2:
The patent modifies the signal parameters by introducing a fixed symbol with specific phase and amplitude values at the block head position. This parameter change ensures compliance with spectral mask requirements while preserving the peak power suppression advantage
Data Source
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AI summary
A transmission apparatus that transmits a block signal including a plurality of data symbols, includes: a data-symbol generation unit that generates a data symbol; a symbol arrangement unit that arranges the data symbol and a same-quadrant symbol such that one same-quadrant symbol that becomes a signal point in a same quadrant in a complex plane is inserted per block at a predetermined position in each block signal to generate a block symbol; a CP insertion unit that inserts a Cyclic Prefix into the block symbol; and an interpolation unit that performs interpolation processing on the block symbol on which CP insertion has been performed.