Base Station Frequency Division and Pilot Block Distribution
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Solution Overview
Problem
In DFT-s-OFDM with SDC, either channel estimation accuracy or the frequency diversity effect decreases depending on the number of Spectrum Divisions (SD's), as increasing the number of SD's reduces the number of pilot blocks within a coherent bandwidth, impairing noise averaging and frequency diversity.
Innovation Solution
A radio communication base station apparatus with a decision section that increases the number of divisions in the frequency domain proportionally to the number of pilot blocks, ensuring that each cluster comprises a sufficient number of pilot blocks for accurate channel estimation while maximizing frequency diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of Spectrum Divisions (SD's) is increased to widen frequency band allocation and enhance frequency diversity effect, then frequency diversity effect is improved, but the number of pilot blocks within coherent bandwidth decreases, degrading channel estimation accuracy
Solution Approach 1:
The patent implements dynamic switching between SC transmission and MC transmission modes based on communication environment conditions. The base station adaptively controls the number of SD's and transmission mode selection according to channel characteristics, allowing the system to transition from fixed to dynamic operation to simultaneously achieve frequency diversity and maintain channel estimation accuracy
Solution Approach 2:
The patent changes key parameters including the number of SD's, transmission mode (SC/MC), and filtering coefficients dynamically. By adjusting these parameters based on communication environment, the system optimizes the balance between frequency diversity effect and channel estimation accuracy, resolving the technical contradiction through parameter optimization
2Area of stationary object
If the number of SD's is increased to assign transmission signal to wider frequency band, then frequency diversity effect is enhanced, but noise averaging effect is reduced due to fewer pilot blocks per cluster, degrading channel estimation accuracy
Solution Approach 1:
The system dynamically adjusts the number of SD's and transmission mode based on communication environment conditions. When channel conditions permit, MC transmission with multiple SD's is used to allocate wider frequency bands and enhance frequency diversity. When channel conditions require higher reliability, the system switches to SC transmission or adjusts SD's to maintain sufficient pilot blocks per cluster, ensuring reliable channel estimation
Solution Approach 2:
The patent optimizes parameters including the number of SD's, transmission mode selection, and filtering coefficients to balance frequency band allocation and channel estimation reliability. By dynamically changing these parameters according to communication conditions, the system achieves both wide frequency band utilization and maintained estimation reliability
Data Source
AI summary
Disclosed are a wireless communication base station device and a division number determination method that improves the frequency diversity effect while maintaining channel estimation accuracy regardless of the number of divisions in the frequency domain of a transmission signal from a wireless communication terminal device. A determination unit determines the number of divisions in the frequency domain of a transmission signal from a wireless communication terminal device. Here, the determination unit increases the number of divisions in the frequency domain of the transmission signal from the wireless communication terminal device as the number of pilot blocks included in the transmission signal increases. In addition, a scheduling unit schedules allocation to the frequency resources of the divided transmission signal according to the number of divisions determined by the determination unit.