LoRa Communication System with Orthogonal Chirp Data Rate
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Solution Overview
Problem
The existing Chirp Spread Spectrum (CSS) modulation technique used in LoRa networks has a low data rate, limiting the efficiency of data transmission and reception in Long Range (LoRa) communication systems.
Innovation Solution
The proposed solution involves converting n-th data of a packet to an up-chirp signal and (n+1)-th data to a down-chirp signal, generating a transmission signal by adding these signals, and using Fast Fourier Transform (FFT) for demodulation in the receiver to achieve a data rate twice that of existing methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSS modulation technique is used in LoRa network, then signal reliability is improved and robustness against Doppler effect is provided, but data rate remains low
Solution Approach 1:
The patent segments the data stream into multiple parallel channels, where even-indexed data bits are modulated using up-chirp signals and odd-indexed data bits are modulated using down-chirp signals. This segmentation allows simultaneous transmission of multiple data streams through orthogonal chirp signals, effectively doubling the data rate while preserving the reliability benefits of CSS modulation
Solution Approach 2:
The patent introduces a new dimension to the traditional CSS modulation by utilizing both up-chirp and down-chirp signals as separate orthogonal carriers for data transmission. Instead of using only frequency variation for modulation, the invention adds the chirp direction dimension (up vs. down) to carry additional information, thereby increasing data rate without compromising signal reliability
Data Source
AI summary
A Long Range (LoRa) communication system with an improved data rate and method thereof are provided. When a packet to be transmitted is received, a transmission device determines a transmission scheme. When the determined transmission scheme is an enhanced transmission scheme, the transmission device transmits a preamble signal indicating that a packet is to be transmitted using the enhanced transmission scheme, converts n-th data of the packet to an up-chirp signal, converts (n+1)-th data of the packet to a down-chirp signal, generates a transmission signal by adding the n-th data converted to the up-chirp signal and the (n+1)-th data converted to the down-chirp signal, and transmits the transmission signal to a reception device.