Hash Spreading Modem Scheme for Extended Wireless Coverage
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Solution Overview
Problem
Current WLAN technologies, such as Wi-Fi, face limitations in extending wireless coverage range and throughput, particularly for high-throughput data transfers and whole-home coverage, including outdoors, due to varying signal-to-noise performance and modulation and coding schemes.
Innovation Solution
A new modem scheme employing hash spreading, which generates additional bits using a set of spreading codes before modulation, extending the range by up to 280% by improving receiver sensitivity and adding security through dynamic selection of spreading codes known only to communicating devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional WLAN modulation and coding schemes are used, then data transmission is achieved, but wireless coverage range is limited
Solution Approach 1:
The patent applies parameter changes by modifying the signal processing parameters through hash spreading. Specifically, it spreads the data bits using a hash function to generate a longer sequence of bits with improved spectral properties, which enhances receiver sensitivity and extends wireless coverage range by up to 280% while maintaining signal-to-noise performance
Solution Approach 2:
The patent introduces hash spreading as an additional processing dimension in the signal transmission chain. By applying hash spreading before or after conventional modulation and coding, it adds a new layer of signal transformation that improves coverage without compromising existing signal quality metrics
2Length of stationary object
If hash spreading is applied to extend range, then wireless coverage is significantly extended, but device complexity increases
Solution Approach 1:
The hash spreading mechanism serves multiple functions simultaneously: it extends wireless coverage range, improves receiver sensitivity, and can be integrated with existing WLAN standards (802.11a/g/n/ac). This multi-functionality reduces the need for separate systems and minimizes additional complexity by leveraging existing infrastructure
3Productivity
If conventional WLAN technologies are used, then basic communication is maintained, but throughput is limited for high-speed data transfers
Solution Approach 1:
The patent applies preliminary action by performing hash spreading on the data bits before modulation and coding. This pre-processing step improves the spectral properties of the signal, enabling better receiver sensitivity and allowing high-throughput data transfers over extended distances that would otherwise be unavailable with conventional schemes
Data Source
AI summary
Technologies directed to hash spreading to extend a wireless coverage are described. One method includes receiving input bits and control information that specifies a first data rate and a second modem scheme having a second signal range that is greater than a first signal range corresponding to a first modem scheme. The method generates a first sequence of bits by scrambling the input bits, the first sequence of bits having a first number of bits. The method generates a second sequence of bits by hash spreading the first sequence of bits using a set of spreading codes. The second sequence of bits has a second number of bits greater than the first number of bits. The method generates first symbols by modulating the second sequence, converts the first symbols into radio frequency (RF) signals, and sends the RF signals to the second wireless device.