OFDM Radar Sensor Progressive Signal Computation
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Solution Overview
Problem
Conventional OFDM radar systems face increased memory requirements and computing time as the number of transmission channels grows, limiting the ability to expand the number of channels without proportional increases in memory usage.
Innovation Solution
The OFDM radar sensor employs a control and evaluation device that transmits OFDM symbols in portions, using multiple buffer memories to store and read out computed signal portions alternately, allowing for progressive computation and digital-to-analog conversion, thereby reducing memory needs and enabling more transmission channels without a corresponding increase in memory requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of transmission channels is increased, then the radar system's capability is improved, but the memory requirements increase proportionally
Solution Approach 1:
The time signals for each transmission channel are segmented into multiple portions that can be stored in separate buffer memories. Instead of storing complete time signals for all channels simultaneously, the system divides the signal storage into manageable segments across multiple buffers, allowing incremental computation and storage.
Solution Approach 2:
The system performs preliminary computation of time signal portions before they are needed for transmission. Buffer memories are pre-filled with computed signal portions, allowing the system to prepare transmission data in advance without requiring large amounts of memory to hold all signals simultaneously.
2Adaptability or versatility
If the number of transmission channels is increased, then the radar system's capability is improved, but the computing time increases
Solution Approach 1:
The inverse Fourier transformation is performed on segmented portions of OFDM symbols rather than processing complete signals. This segmentation allows parallel processing of multiple channel portions simultaneously, reducing the overall computing time required to generate signals for multiple transmission channels.
Solution Approach 2:
Time signal portions are computed in advance and stored in buffer memories before transmission is required. This preliminary computation allows the system to prepare multiple channel signals without incurring the full computing burden during the transmission cycle, effectively distributing computation over time.
Data Source
AI summary
An OFDM radar sensor including multiple transmission channels and at least one reception channel, and a method for operating such an OFDM radar sensor. At least for first transmission channels, the signal form of the signal to be transmitted, which includes a sequence of OFDM symbols in question, is progressively computed in portions for each transmission channel, and multiple buffer memories are used in alternation for storing a computed portion of the signal form and for reading out a previously computed and stored preceding portion of the signal form, which is converted from digital to analog and transmitted. A particular portion of the signal form is computed and stored in one of the buffer memories while a preceding portion of the signal form is being read out from another of the buffer memories and converted from digital to analog, and transmitted on the transmission channel in question.