Extended Range Modulation Coding Scheme Design
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Solution Overview
Problem
Current wireless communication standards, such as 802.11b, face limitations in channel coding and coexistence with OFDM-based systems, necessitating a modulation and coding scheme (MCS) that provides extended range coverage comparable to 802.11a while improving performance by at least 9 dB over existing 20 MHz MCS 0 of OFDM-based systems.
Innovation Solution
The proposed extended range MCS system enhances the modulation schemes for Wi-Fi 8 by boosting the short and long training fields, repeating specific signaling fields, and applying quadrature binary phase-shift keying (QBPSK) to indicate extended range mode, along with increased repetition of data and signaling fields to improve detection and channel estimation in noisy environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If current wireless communication standards (802.11b) are used, then long range communication is achieved, but channel coding is weak and coexistence with OFDM-based systems is problematic
Solution Approach 1:
The patent applies parameter changes by modifying the modulation and coding scheme parameters specifically for extended range operations. It introduces a new MCS index (MCS 15) with specific modulation order (QPSK), coding rate (1/2), and guard interval (8 microsecond) parameters that differ from standard MCS settings, enabling optimized performance for long-range communication while maintaining compatibility with existing OFDM-based systems
2Adaptability or versatility
If standard OFDM-based MCS 0 is used, then system compatibility is maintained, but performance improvement of at least 9 dB is not achieved
Solution Approach 1:
The patent applies local quality by creating a specialized MCS configuration (MCS 15) that is locally optimized for extended range scenarios while maintaining overall system compatibility. The specific combination of QPSK modulation, 1/2 coding rate, and 8 microsecond guard interval provides enhanced robustness and 9 dB performance improvement in challenging communication conditions without breaking compatibility with standard OFDM-based systems
3Reliability
If training fields and signaling fields are repeated multiple times, then detection and channel estimation in noisy environments is improved, but transmission time and overhead increase
Solution Approach 1:
The patent applies partial or excessive action by repeating specific critical fields (training fields and signaling fields) a specific number of times (e.g., 2-4 repetitions) to achieve sufficient detection reliability in noisy environments. This selective repetition of only the most critical fields rather than all data transmissions provides the necessary 9 dB performance improvement while limiting the time overhead to acceptable levels
Data Source
AI summary
This disclosure describes systems, methods, and devices related to extended range modulation and coding scheme (MCS). A device may generate a first orthogonal frequency-division multiplexing (OFDM) signal to be transmitted in a frequency band. The device may generate a second OFDM signal to be transmitted in the frequency band, wherein the second OFDM signal is a duplicate of the first signal. The device may assign a reduced number of guard intervals (GIs) to the first OFDM signal and the second OFDM signal. The device may cause to send the first OFDM signal and the second OFDM signal using the frequency band.