High-Speed Data Transmission via Mode-Segmented Preamble
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional wireless local area network (WLAN) systems, such as IEEE 802.11a, are limited to a maximum data rate of 54 Mbps, which is insufficient for high-speed multimedia applications, and existing systems using multiple antennas and bandwidths are not compatible with conventional systems.
Innovation Solution
A data transmitting and receiving device that utilizes multiple antennas and bandwidths, with a configuration including a bandwidth distributor, encoder, mapper, antenna distributor, subcarrier allocator, inverse Fourier transform unit, preamble generator, and frame generator, to achieve high data rates while maintaining compatibility with conventional systems through the use of a transmit mode identifier and channel estimation methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antennas and bandwidths are used to increase data rate, then data rate is improved, but compatibility with conventional systems deteriorates
Solution Approach 1:
The system segments the transmission by using a transmit mode identifier to separate conventional mode transmissions from high-speed mode transmissions. This allows the apparatus to operate in different modes independently, enabling high data rates when needed while maintaining compatibility with conventional systems during normal operation.
Solution Approach 2:
The transmit mode identifier acts as an intermediary signal that mediates between the high-speed transmission mode and conventional transmission mode. Receivers use this identifier to determine which mode is being used, allowing seamless coexistence of both modes without interference, thus maintaining compatibility while enabling high data rates.
2Productivity
If multiple bandwidths are used to achieve high data rates, then data rate is improved, but system complexity increases
Solution Approach 1:
The system dynamically adjusts the number of bandwidths and antennas used based on transmission conditions and requirements. The apparatus can flexibly switch between using one or multiple 20 MHz bandwidths and between single or multiple antennas, optimizing performance while managing complexity adaptively rather than requiring complex fixed infrastructure.
3Productivity
If multiple antennas are used for high-speed transmission, then data rate is improved, but ease of operation deteriorates
Solution Approach 1:
The system performs self-identification of transmission mode through the transmit mode identifier embedded in the signal. Receivers automatically detect whether conventional or high-speed mode is being used and adjust their processing accordingly, eliminating the need for manual configuration or complex operational procedures while enabling high data rates.
Data Source
AI summary
In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.