Wireless Frame Transmission Using Carrier Frequency Offset Alignment
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining reliable communication due to carrier frequency offset issues when new wireless communication apparatuses are added to cooperate with existing ones, leading to potential misalignment in transmission frequencies, which can result in failed frame receptions.
Innovation Solution
The implementation of a wireless communication apparatus that estimates the carrier frequency offset (CFO) between existing and new apparatuses by analyzing frames and applying CFO correction values to ensure synchronized oscillation frequencies during transmission, thereby reducing carrier frequency offset and improving frame reception reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If new wireless communication apparatuses are added to cooperate with existing ones for improving communication reliability, then communication reliability is improved, but carrier frequency offset increases causing transmission frequency misalignment
Solution Approach 1:
The patent applies preliminary action by having the wireless communication apparatus estimate the carrier frequency offset (CFO) between its oscillator and the oscillator of another wireless communication apparatus before actual data transmission. The apparatus receives a frame from the other apparatus, estimates the CFO based on this frame, and then uses the estimated CFO to correct its own transmission frequency. This preliminary frequency alignment ensures that when the apparatus later transmits frames during overlapping periods, the frequency misalignment is minimized, thus maintaining communication reliability while adding new apparatuses to the network.
2Reliability
If wireless terminal transmits data to multiple wireless base stations simultaneously for improving reliability, then communication reliability is improved, but frequency synchronization becomes more difficult
Solution Approach 1:
The patent implements feedback by having the wireless communication apparatus receive frames from other apparatuses and use these received frames to estimate the carrier frequency offset. The estimation process provides feedback information about the frequency difference, which is then used to adjust and correct the transmission frequency. This feedback mechanism enables the apparatus to maintain frequency synchronization when communicating with multiple base stations simultaneously, as each base station's frame can serve as a reference for estimating and correcting the CFO, thereby managing frequency synchronization complexity while improving reliability through diverse transmission paths.
Data Source
AI summary
According to one embodiment, a wireless communication apparatus includes receiver circuitry and transmitter circuitry. The receiver circuitry is configured to receive a first frame addressed to another apparatus, the first frame being transmitted by a first wireless communication apparatus, and estimate a difference between an oscillation frequency of an oscillator of the first wireless communication apparatus and an oscillation frequency of an oscillator of the wireless communication apparatus based on the first frame. The transmitter circuitry is configured to transmit a third frame at a frequency determined based on the difference during a period at least partially overlapping a period during which the first wireless communication apparatus transmits a second frame addressed to a second wireless communication apparatus.