ELR Transceiver EVM Relaxation for Extended Wireless Range
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Solution Overview
Problem
The IEEE 802.11bn standard faces challenges with signal distortion due to power boosting in Extended/Enhanced Long Range (ELR) mode, leading to excessive error vector magnitude (EVM) and limited range, necessitating a relaxation of EVM requirements for improved transmission power and range.
Innovation Solution
Relaxing the EVM requirement for ELR mode to operate at negative SNRs, introducing new modulation and coding schemes (MCSs) such as QPSK 2/3, 16-QAM 2/3, 256-QAM 2/3, and 16-QAM 5/6, and allowing higher transmission power with specific constellation error requirements for transmitters and receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If power boosting is applied in ELR mode to extend transmission range, then transmission range is improved, but signal distortion increases leading to excessive EVM
Solution Approach 1:
The patent changes the EVM requirement parameter from the conventional -5 dB to a relaxed threshold (e.g., -2 dB to -4 dB) specifically for ELR mode operations. This parameter change allows the system to operate at negative SNRs with higher transmission power while accepting that modulation quality will be lower, thus resolving the contradiction between extended range and maintained modulation quality.
2Power
If EVM requirement is relaxed to allow higher transmission power, then transmission power is improved, but signal distortion increases
Solution Approach 1:
The patent modifies the EVM threshold parameter to be less stringent (e.g., -2 dB to -4 dB instead of -5 dB) for ELR mode, enabling transmitters to operate at higher power levels. This parameter relaxation directly resolves the contradiction by allowing higher transmission power while accepting increased signal distortion as a trade-off for extended range communication.
3Manufacturing precision
If conventional EVM requirement of -5 dB is maintained, then modulation quality is preserved, but transmission range is limited
Solution Approach 1:
The patent implements a mode-specific EVM parameter where ELR mode uses a relaxed threshold (e.g., -2 dB to -4 dB) compared to the conventional -5 dB requirement. This parameter differentiation allows ELR operations to achieve extended transmission ranges by operating at negative SNRs with higher power, while other modes maintain stricter quality requirements.
Data Source
AI summary
This disclosure describes systems, methods, and devices related to optimized transceiver capabilities. A device may provide support for multiple modulation and coding schemes (MCSs), including QPSK 2/3, 16-QAM 2/3, 256-QAM 2/3, and 16-QAM 5/6, with relaxed constellation error requirements to enhance throughput and range in wireless communication. The device may cause to implement enhanced transmitter constellation error requirements for improved signal quality in 802 11bn networks. The device may provide support for extended range modulation and coding schemes (ELR MCSs), including BPSK 1/2 and QPSK 1/2 with 4× duplication, to optimize network performance.