OFDM Modulation Controller for Wireless LAN Coverage
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Solution Overview
Problem
Conventional wireless LAN systems have limited service coverage and high manufacturing costs due to the need for high gain amplifiers and antennas to increase coverage, which also increase power consumption and reduce compatibility with existing systems.
Innovation Solution
The system employs an OFDM modulation controller and frame generation controller to control subcarrier allocation and repetition of OFDM symbols, allowing for increased service coverage while maintaining compatibility with conventional systems by reducing power consumption and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If high gain amplifiers and high gain antennas are used to increase service coverage, then service coverage is improved, but manufacturing cost and power consumption increase
Solution Approach 1:
The patent changes the modulation parameters by repeating OFDM symbols with different subcarrier allocations instead of using high gain hardware. This parameter-based approach achieves coverage extension through signal processing rather than hardware amplification, thereby avoiding increased manufacturing costs and power consumption associated with high gain amplifiers and antennas
2Area of stationary object
If high gain amplifiers and high gain antennas are used to increase service coverage, then service coverage is improved, but power consumption increases
Solution Approach 1:
The patent uses parameter changes in OFDM modulation (repeating symbols with different subcarrier allocations) to extend coverage without the energy-intensive hardware amplification and high gain antennas, thereby maintaining lower power consumption while achieving improved service coverage
3Area of stationary object
If conventional OFDM modulation is used, then system simplicity is maintained, but service coverage is limited
Solution Approach 1:
The patent segments the OFDM symbol transmission by repeating symbols with different subcarrier allocations. This segmentation approach extends coverage by dividing the transmission into multiple targeted symbol repetitions, managing the complexity through structured signal processing rather than overwhelming system redesign
Solution Approach 2:
The patent implements periodic repetition of OFDM symbols with varying subcarrier allocations. This periodic action pattern extends service coverage by systematically repeating transmissions at optimized intervals, balancing the enhanced coverage benefit against the increased modulation complexity in a manageable manner
Data Source
AI summary
The present invention relates to an orthogonal frequency division multiplexing wireless local area network (LAN) transmitting/receiving system for providing expanded service coverage, and a method thereof. A first OFDM modulation is performed for an even-numbered time, and a second OFDM modulation is performed for an odd-numbered time. A transmitting frame including a plurality of signal fields according to the first and second OFDM modulation is transmitted. The receiving system determines whether a signal field is repeatedly generated in the frame. If the signal field is not repeatedly generated, corresponding demodulation is performed. If repeatedly performed, the signal field is demodulated by using first bit allocation information and second bit allocation information having a ½ value of the first bit allocation information. A data field is demodulated according to the demodulated signal field.