Single-Carrier Waveform System With Frequency Domain Equalization
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Solution Overview
Problem
Traditional communications systems face challenges in urban environments due to multipath interference, which is not effectively addressed by existing technologies, especially in line-of-sight applications, and lack power efficiency and anti-jamming capabilities.
Innovation Solution
A communications system utilizing a single-carrier waveform with frequency domain equalization, incorporating a combiner, anti-jamming weight matrix, and FDE engines to combine and process signals, maximizing received signal power and resisting multipath fading while providing anti-jamming capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional multipath interference solutions are used, then resistance to multipath fading is improved, but power efficiency deteriorates and line-of-sight performance worsens
Solution Approach 1:
The patent transforms the time-domain equalization approach into frequency-domain equalization by applying FFT to convert the received signal to frequency domain, performing equalization operations there, and then using IFFT to convert back to time domain. This parameter transformation resolves the contradiction by achieving multipath resistance through frequency domain processing rather than time domain processing, improving power efficiency while maintaining reliability
Solution Approach 2:
The patent replaces traditional time-domain equalization mechanisms with frequency-domain equalization mechanisms. By substituting the mechanical/time-domain approach with a frequency-domain approach using FFT and IFFT transforms, the system achieves better power efficiency while maintaining resistance to multipath fading effects
2Use of energy by moving object
If single-carrier waveform is used, then power efficiency is improved, but resistance to multipath interference deteriorates
Solution Approach 1:
The patent introduces frequency-domain equalization as an intermediary processing step between signal reception and demodulation. The FDE engine acts as a mediator that processes the single-carrier signal in the frequency domain, adding resistance to multipath interference without sacrificing the power efficiency benefits of single-carrier waveforms
Solution Approach 2:
The patent changes the processing domain parameter from time domain to frequency domain. By performing equalization operations in the frequency domain rather than time domain, the system maintains the power efficiency of single-carrier waveforms while gaining resistance to multipath interference through frequency-selective equalization
3Reliability
If frequency domain equalization is implemented, then resistance to multipath fading is improved, but device complexity increases
Solution Approach 1:
The patent performs channel estimation using preamble sequences before the actual data transmission. This preliminary action prepares the equalization filters in advance, reducing the processing complexity during the main data transmission phase while maintaining effective multipath resistance through pre-computed frequency domain equalization coefficients
Data Source
AI summary
A communications system includes one or more antennas and a receiver coupled to the one or more antennas. The one or more antennas are operable to receive a signal transmitted from a transmitter. The receiver includes a combiner that is operable to combine the signals received by the one or more antennas into a combined signal. The signal received by the receiver is a single-carrier waveform comprising a signal field and one or more data fields after the signal field. The signal field indicates a modulation technique of the one or more data fields. The one or more data fields include a first short unique word, a data payload after the second short unique word, and a second short unique word after the data payload.