Composite Signal Generation for WLAN Bandwidth Expansion
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Solution Overview
Problem
Current wireless local area networks (WLANs) face limitations in achieving higher data rates without significant interference, particularly in coexistence of devices operating at different data rates within the same environment, such as 802.11a and proposed 802.11n standards, which restricts bandwidth utilization and efficiency.
Innovation Solution
The method involves interpolating and shifting multiple input signals to create a composite signal with increased bandwidth by multiplying the signal sample rate and aggregating them, specifically demonstrated by taking two 20 MHz 802.11a signals, interpolating by a factor of 2, and shifting one signal up and the other down by 10 MHz to produce a 40 MHz composite signal, which can be applied to various standards like 802.11n, Bluetooth, and xDSL.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If devices operate at higher data rates in the same WLAN environment, then bandwidth utilization and communication efficiency improve, but interference between devices operating at different data rates increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple channels and assigns different data rates to different frequency segments. High data rate devices operate on certain frequency channels while low data rate devices operate on other channels, allowing simultaneous operation without interference. This frequency division approach enables coexistence of 802.11a and 802.11n devices in the same environment.
Solution Approach 2:
The patent introduces frequency as an additional dimension for resource allocation. Instead of competing for the same frequency resource, devices are differentiated by operating on different frequency channels. This dimensional separation allows multiple data rates to coexist without mutual interference, transforming a one-dimensional data rate problem into a multi-dimensional frequency-resource optimization problem.
2Quantity of substance
If multiple devices communicate simultaneously in the same frequency band, then network capacity increases, but collision and interference between signals increase
Solution Approach 1:
The patent merges multiple frequency channels into a unified communication framework where devices can simultaneously transmit on different channels. By combining the resources of multiple frequency bands and coordinating their usage, the system enables multiple simultaneous communications without signal collision, effectively increasing network capacity while maintaining signal integrity.
3Productivity
If the bandwidth is increased to support higher data rates, then communication efficiency improves, but the complexity of signal processing and coordination increases
Solution Approach 1:
The patent designs a universal frequency allocation framework that can accommodate multiple data rate standards (802.11a, 802.11n) and multiple channel configurations within a single system. This multi-functional approach allows the same infrastructure to support both narrowband low-data-rate communications and wideband high-data-rate communications, reducing the need for separate specialized systems and lowering overall complexity.
Data Source
AI summary
Disclosed herein are various embodiments of methods, systems, and apparatus for increasing packet generation in a digital communication system. In one exemplary method embodiment, multiple input signals are interpolated, shifted, and aggregated into a composite signal for transmission over a network.