SC-FDMA Transmitting Apparatus Bandwidth Utilization
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Solution Overview
Problem
Conventional SC-FDMA transmission systems are limited in effectively utilizing wide system bandwidth and suffer from high peak-to-average power ratio (PAPR) due to their configuration of allocating signals only to predetermined frequency bands.
Innovation Solution
A transmitting apparatus that divides the transmission signal into blocks, applies pre-coding and further divides them into sub-blocks, allocates these sub-blocks to desired frequencies within the system band, and transforms them using inverse discrete Fourier transform to generate a time signal, enabling efficient use of wide system bandwidth while suppressing PAPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple SC-FDMA transmission systems are combined to utilize wide system bandwidth, then frequency usage efficiency is improved, but peak-to-average power ratio (PAPR) increases
Solution Approach 1:
The transmission signal sequence is divided into multiple blocks, and each block is further divided into sub-blocks. These sub-blocks are then allocated to different frequency resources. This segmentation approach allows wide bandwidth utilization while maintaining lower PAPR by distributing the signal energy across multiple smaller blocks rather than combining full-bandwidth signals.
2Device complexity
If SC-FDMA transmission systems allocate signals only to predetermined frequency bands, then device complexity is reduced, but system bandwidth utilization is limited
Solution Approach 1:
The patent introduces dynamic frequency allocation where sub-blocks can be allocated to different frequency resources based on system conditions and requirements. The frequency allocating unit dynamically assigns sub-blocks to available frequency resources, enabling flexible bandwidth utilization while maintaining manageable system complexity through standardized allocation procedures.
3Quantity of substance
If multiple SC-FDMA transmission systems are combined for wideband transmission, then transmission capacity is improved, but signal quality deteriorates due to high PAPR
Solution Approach 1:
By segmenting the transmission signal into multiple sub-blocks and allocating them to different frequency resources, the patent reduces the PAPR of individual transmitted signals. This segmentation maintains transmission capacity by utilizing wide bandwidth while improving signal quality through lower peak power requirements, enabling more reliable transmission.
Data Source
AI summary
A transmitting apparatus that converts a transmission digital signal to a high-frequency analog signal and transmits the high-frequency analog signal using a plurality of transmission frequencies, the transmitting apparatus including: a dividing unit 12 that divides a transmission signal sequence into a plurality of blocks; a sub-block generating unit 13 that applies pre-coding processing to the blocks and further divides the blocks after the pre-coding processing into sub-blocks; a frequency allocating unit 14 that generates a frequency signal in which the sub-blocks are allocated to the transmission frequencies; and an inverse DFT processing unit 15 that transforms the frequency signal into a time signal, wherein the transmitting apparatus sets the time signal as the transmission digital signal.