Transmitting Apparatus Phase Continuity Zero Section Out-of-Band Spectrum
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Solution Overview
Problem
In single carrier block transmission systems, phase discontinuity between blocks when some blocks are set to zero leads to an increase in out-of-band spectrum, which interferes with adjacent channels.
Innovation Solution
A transmitting apparatus that generates data symbols and zero symbols, and uses static sequence symbols to create pre-interpolation blocks with divided static sequence symbols at the beginning and end, which are then processed through Fourier transforms and interpolation to maintain phase continuity and suppress out-of-band spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If zero sections are introduced in SC block transmission for beam switching, then beamforming control is enabled, but phase discontinuity occurs between blocks causing out-of-band spectrum increase
Solution Approach 1:
A transition signal is introduced as an intermediary element between the zero section and the subsequent data section. This transition signal acts as a mediator that bridges the phase discontinuity caused by the zero section, allowing beam switching to occur while suppressing the harmful out-of-band spectrum emissions.
Solution Approach 2:
The transition signal is generated in advance before the zero section ends and the data section begins. By preparing and inserting this transition signal beforehand, the phase discontinuity is preemptively addressed, preventing the generation of out-of-band spectrum rather than correcting it after occurrence.
2Object-generated harmful factors
If static sequence symbols are inserted at both ends of blocks to suppress out-of-band spectrum, then spectral mask compliance is improved, but device complexity increases
Solution Approach 1:
Instead of applying uniform processing to all blocks, the invention applies transition signal insertion only locally at the boundaries where phase discontinuities occur (specifically after zero sections). This localized approach suppresses out-of-band spectrum without requiring complex processing of the entire signal block, thereby reducing overall device complexity.
Solution Approach 2:
The invention extracts and isolates the problematic phase discontinuity regions (after zero sections) and applies specific transition signal processing only to these localized areas. By separating the problem areas from the rest of the signal, the solution avoids the complexity of processing the entire block uniformly.
Data Source
AI summary
A transmitting apparatus includes: a data generator that generates data symbols; a zero generator that generates zero symbols having signal values of zero; a controller that receives the data symbols and the zero symbols, and controls symbols to be output; a static sequence generator that generates static sequence symbols having signal values of a static sequence; a multiplexer that divides the static sequence symbols and generates a pre-interpolation block by arranging the divided static sequence symbols at a head of the pre-interpolation block and a tail of the pre-interpolation block in the pre-interpolation block, the head preceding the symbols input from the controller, the tail following the symbols input from the controller, and a signal converter that performs a Fourier transform, the interpolation, and an inverse Fourier transform on the pre-interpolation block and outputs a block having being subjected to the interpolation.