Adaptive Packet Modulation for Non-Contiguous Spectrum Transmission
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Solution Overview
Problem
Current wireless local area networks (WLANs) face challenges in achieving throughput beyond 1 Gbps due to limitations in channel bandwidth and the difficulty in finding contiguous frequency spectra for wide bandwidth transmissions, especially in crowded frequency environments.
Innovation Solution
The proposed method allows for dynamic selection of bandwidth and modulation/coding rates on a per-packet basis, enabling non-contiguous spectrum operation by splitting bandwidth into segments and correlating synthesizer phases for efficient transmission across available channels, supporting bandwidths up to 160 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wide channel bandwidth is used to increase throughput, then data transmission rate is improved, but finding contiguous frequency spectrum becomes more difficult in crowded environments
Solution Approach 1:
The patent divides the wide bandwidth packet into multiple bandwidth units (BWUs) that can be transmitted on non-contiguous frequency channels. Each BWU is assigned a specific frequency range, and the system can select and transmit these units on available channels independently, resolving the contradiction between requiring wide bandwidth for high throughput and the difficulty of finding contiguous spectrum in crowded environments.
2Productivity
If non-contiguous spectrum operation is implemented to achieve wide bandwidth transmission, then throughput is improved, but system complexity increases due to multiple synthesizers and phase correlation requirements
Solution Approach 1:
The patent performs phase correlation of synthesizers before transmitting the packet. The system pre-synchronizes the phases of multiple synthesizers that will be used for different bandwidth units, ensuring that when the non-contiguous spectrum transmission occurs, the phases are already correlated. This preliminary action reduces the complexity during actual transmission while still enabling high throughput through non-contiguous operation.
Data Source
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AI summary
A method for transmitting information in a wireless system is provided. In this method, the traffic on a plurality of channels can be determined. A bandwidth for a packet can be selected based on the traffic and available channel bandwidths. A modulation and a coding rate can be selected from a plurality of modulations and associated coding rates. The modulation and coding rate can be applied to a segment of the packet, wherein each segment includes one or more bandwidth units. The packet including the selected modulation and coding rate therein can be transmitted on at least one channel.