OFDM Symbol Quantity Determination for Wireless Data Alignment
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in data alignment using zero padding, leading to wasted frequency band resources and increased overheads, particularly in MU-MIMO and OFDMA technologies, which results in reduced throughput and reliability.
Innovation Solution
The method involves determining the maximum OFDM symbol quantity in a frequency band and using additional long training fields to optimize data transmission, reducing zero padding overheads and improving channel estimation accuracy by adjusting the quantity of OFDM symbols based on the relationship between subbands and the entire frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If zero padding is used for data alignment in MU-MIMO and OFDMA transmission, then data alignment between different flows and subbands is achieved, but frequency band resources are wasted and overheads increase
Solution Approach 1:
The patent changes the parameter of data alignment from time-domain zero padding to frequency-domain phase rotation. By applying phase rotation to subcarriers in the frequency domain, the patent achieves data alignment without introducing zero padding, thereby eliminating the waste of frequency band resources while maintaining alignment precision.
Solution Approach 2:
The patent substitutes the mechanical approach of zero padding (adding dummy data) with a signal processing approach using phase rotation in the frequency domain. This substitution eliminates the need for additional padding operations and reduces the overhead associated with time-domain alignment methods.
2Manufacturing precision
If zero padding is used for data alignment in MU-MIMO and OFDMA transmission, then data alignment is achieved, but system throughput decreases due to increased overheads
Solution Approach 1:
The patent changes the alignment parameter from time-domain padding to frequency-domain phase rotation, which reduces the overhead required for alignment. This parameter change increases the effective data transmission capacity and improves system throughput by eliminating redundant padding operations.
Solution Approach 2:
The patent extracts and removes the zero padding component from the data alignment process. By eliminating the padding operation entirely and replacing it with phase rotation, the patent reduces overhead and increases the proportion of useful data transmission, thereby improving throughput.
3Measurement precision
If additional long training fields are added for channel estimation, then channel estimation accuracy is improved, but transmission overhead increases
Solution Approach 1:
The patent performs channel estimation using long training fields before data transmission, and uses the estimated channel information to determine appropriate phase rotation parameters. This preliminary channel estimation enables accurate frequency-domain alignment without requiring additional overhead during the actual data transmission phase.
Solution Approach 2:
The patent introduces channel estimation as an intermediary process that enables efficient data alignment. By using long training fields to estimate channel characteristics first, the system can then apply precise phase rotation during data transmission without needing excessive overhead, as the channel state information guides the alignment process.
Data Source
AI summary
A method includes: determining a maximum orthogonal frequency division multiplexing OFDM symbol quantity of a frequency band used for downlink transmission, where the maximum OFDM symbol quantity of the frequency band is a maximum value of maximum OFDM symbol quantities of all subbands of the frequency band; determining, according to a value relationship between a maximum OFDM symbol quantity of a subband to which user equipment belongs and the maximum OFDM symbol quantity of the frequency band, additional long training field instruction information used to instruct whether to send an additional long training field to the user equipment; and sending an indication message to the user equipment, where the indication message includes the additional long training field instruction information.