Wireless Frame Signaling for Unequal Modulation Across Spatial Streams
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Solution Overview
Problem
Existing wireless communications technologies face challenges in efficiently and securely conveying communications signaling information, particularly in high-throughput applications like video teleconferencing and HD video surveillance, requiring improved modulation and coding schemes for multi-link devices.
Innovation Solution
The implementation of a wireless device with a controller that generates frames containing indications of unequal and equal modulation and/or coding, utilizing a 1-bit unequal modulation subfield and a 5-bit Modulation and Coding Scheme (MCS) subfield to signal modulation patterns across spatial streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If unequal modulation and coding schemes are implemented across spatial streams to improve data transmission efficiency, then throughput is improved, but frame structure complexity increases
Solution Approach 1:
The frame structure is segmented into distinct subfields: a modulation pattern subfield that indicates unequal modulation patterns across spatial streams, and a separate MCS subfield that indicates coding schemes. This segmentation allows independent optimization of modulation and coding parameters without creating a combinatorial explosion of frame structures.
Solution Approach 2:
The patent introduces a modulation pattern subfield that adds a new dimension to the frame structure, separating modulation indication from coding indication. This dimensional separation allows the system to specify unequal modulation patterns (e.g., different QAM orders for different spatial streams) without complicating the existing MCS signaling mechanism.
2Measurement precision
If separate signaling for unequal modulation and coding is implemented, then signaling precision is improved, but device complexity increases
Solution Approach 1:
The signaling is segmented into a modulation pattern subfield and an MCS subfield. The modulation pattern subfield precisely indicates the modulation scheme for each spatial stream (e.g., QPSK, 16-QAM, 64-QAM, 256-QAM), while the MCS subfield precisely indicates the coding rate. This segmentation enables precise independent control of modulation and coding parameters.
Solution Approach 2:
The MCS subfield serves multiple functions: it indicates the coding scheme for all spatial streams when equal modulation is used, and it indicates the base MCS for spatial streams when unequal modulation is used. This multi-functionality reduces the need for separate dedicated fields for each parameter.
3Device complexity
If joint signaling of unequal modulation and coding is implemented, then device complexity is reduced, but signaling precision deteriorates
Solution Approach 1:
The patent adds a modulation pattern subfield as a separate dimension from the MCS subfield. This dimensional separation ensures that modulation pattern indication and coding scheme indication do not interfere with each other, maintaining signaling precision while keeping the overall frame structure manageable through systematic organization.
Data Source
AI summary
Embodiments of a wireless device and method are disclosed. In an embodiment, a wireless device comprises a wireless transceiver to receive and transmit frames, and a controller operably coupled to the wireless transceiver to process the frames, wherein the controller is configured to generate a frame that includes an indication selected from a first indication of an unequal modulation and/or coding and a second indication of equal modulation and/or coding.