Random Access Preamble Detection with Frequency Offset Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-frequency radio communications, existing random access preamble detection methods suffer from low receiving sensitivity due to phase noise and frequency errors, leading to increased access failure rates and limited system coverage.
Innovation Solution
A method for random access preamble detection in a base station that determines and compensates for frequency offsets in the received uplink signal, using two levels of false alarm values to enhance detection success rates and reduce hardware complexity, allowing existing processing modules to be reused without dedicated hardware for preamble detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If existing random access preamble detection methods are used in high-frequency radio communications, then the system can operate at high carrier frequencies with multiple antenna elements, but receiving sensitivity deteriorates due to phase noise and frequency errors
Solution Approach 1:
The patent applies preliminary action by performing frequency offset compensation before the random access preamble detection process. The base station estimates the frequency offset from the received uplink signal and compensates for it in advance, which eliminates the negative impact of phase noise and frequency errors on receiving sensitivity at high carrier frequencies
Solution Approach 2:
The patent changes the frequency offset parameter by estimating and compensating for frequency offsets in the received uplink signal. This parameter adjustment corrects the signal before detection, maintaining receiving sensitivity despite operating at high carrier frequencies with multiple antenna elements
2Measurement precision
If dedicated hardware is implemented for random access preamble detection, then detection accuracy improves, but hardware complexity increases
Solution Approach 1:
The patent applies universality by enabling existing Fast Fourier Transform (FFT) modules, which are already configured for other uplink channels, to be reused for random access preamble detection. This multi-functional use of existing hardware reduces the need for dedicated detection hardware while maintaining detection accuracy through proper signal processing
Solution Approach 2:
The patent applies self-service by allowing existing processing modules to serve the random access preamble detection function without requiring separate dedicated hardware. The FFT modules and other signal processing components already present in the base station are utilized to perform preamble detection, reducing overall hardware complexity
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Embodiments of the present disclosure provide a method in a base station for random access preamble detection. The method comprises determining a frequency offset of a received uplink signal and adjusting the received uplink signal with the determined frequency offset. The method also comprises detecting, from the adjusted uplink signal, whether there is a random access preamble with a first false alarm value. Additionally, the method may further comprise detecting from the received uplink signal, whether there is a random access preamble with a second false alarm value, before determining the frequency offset of the received uplink signal. Determining the frequency offset of the received uplink signal may be performed in response that a random access preamble is detected with the second false alarm value, the second false alarm value being higher than the first false alarm value. Embodiments of the present disclosure also relate to a corresponding apparatus and a base station using the method.