Transmitting Circuit Frequency Domain Segmentation for ADC Bottleneck
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Solution Overview
Problem
Current radio communication systems face challenges with high bandwidth and high-speed data transmission due to the ADC/DAC bottleneck, leading to complex post-processing requirements that degrade system performance and require asymmetric DAC and ADC capabilities.
Innovation Solution
A transceiver system that decomposes data into multiple parallel sub digital signal flows, performs modulation and frequency relocation on each sub flow independently, and synthesizes them into a large bandwidth signal for digital-to-analog conversion, reducing processing complexity by allowing independent processing at the transmitting and receiving ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If time domain interleaved sampling method or frequency domain multichannel sampling method is used to solve ADC/DAC bottleneck, then high bandwidth and high speed requirements are met, but complex post-processing is required which degrades system performance
Solution Approach 1:
The patent divides the wideband signal into multiple narrowband sub-signals through frequency domain segmentation. Each sub-signal is processed independently by separate ADC channels operating at lower sampling rates, avoiding the need for high-speed single-channel ADC while eliminating complex post-processing requirements. The segmentation is achieved through filter bank structure that splits the input signal into multiple frequency sub-bands.
Solution Approach 2:
The patent transforms the problem from time-domain high-speed sampling to frequency-domain parallel processing. By converting the single high-speed sampling channel into multiple low-speed parallel channels through frequency domain decomposition, the system achieves equivalent high bandwidth capability without requiring high-speed ADC, thereby reducing post-processing complexity.
2Speed
If DAC operates at higher speed and precision than ADC to meet high bandwidth requirements, then system bandwidth capability is improved, but asymmetric capabilities between DAC and ADC increase device complexity and cost
Solution Approach 1:
The patent intentionally introduces asymmetric filtering at the receiver side where synthesis filters combine the parallel sub-signals back into the original wideband signal. This asymmetric filter design compensates for the frequency domain segmentation and enables perfect signal reconstruction despite using multiple low-speed ADC channels instead of a single high-speed ADC, thereby eliminating the need for asymmetric DAC-ADC capabilities.
3Speed
If multiple parallel ADC channels are used to reduce sampling rate requirements, then ADC speed requirements are reduced, but the number of ADC devices increases device complexity
Solution Approach 1:
The patent merges multiple parallel low-speed ADC processing channels into a single wideband output signal through frequency domain synthesis. The synthesis filters combine the parallel sub-signals from multiple ADC channels, and the merged output is equivalent to the original high-speed single-channel signal, thereby reducing device complexity while maintaining low sampling rate requirements.
Data Source
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AI summary
The present invention provides a transmitting circuit, a transceiver, a communication system, and a method for transmitting data. The transmitting circuit includes: a digital interface circuit, configured to obtain, in a predetermined bandwidth, data to be sent, and decompose the data into N parallel sub digital signal flows; a digital modulation circuit, configured to receive N sub digital signal flows, and modulate the N sub digital signal flows to obtain N modulated signals; a frequency relocation circuit, configured to receive the N modulated signals, and perform frequency relocation on the N modulated signals; a synthesizer, configured to modulate M modulated signals of the N modulated signals that have undergone frequency relocation into a bandwidth signal; a digital to analog converter, configured to receive the bandwidth signal, and perform digital to analog conversion on the bandwidth signal to obtain an analog signal; an up-conversion circuit, configured to receive the analog signal, and convert the analog signal into a radio frequency signal, so that the radio frequency signal is sent by an antenna. The present invention can reduce the signal processing complexity of a transmitting circuit, thereby improving system performance.