# US 11,115,077 B1 · Wireless communication method for modulating data signals in a chirp spread spectrum communication system

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- Number: US 11,115,077 B1
- Document ID: US11115077B1
- Status: Granted
- Kind: B1
- Application number: 17/034,830
- Filed: 2020-09-28
- Granted: 2021-09-07
- Earliest claimed: 2020-08-03
- Assignees: King Abdulaziz University
- Applicants: King Abdulaziz University
- Inventors: Ahmed Barnawi
- Web page: https://patentgrep.com/patent/US11115077B1

## CPC

- H04B 1/69: Spread spectrum techniques
- H01Q 23/00: Antennas with active circuits or circuit elements integrated within them or attached to them
- H03F 3/19: with semiconductor devices only
- H03F 3/195: in integrated circuits
- H03F 3/45475: {using IC blocks as the active amplifying circuit}
- H03H 17/02: Frequency selective networks {(digital computers for complex mathematical operations G06F17/10)}
- H03K 19/20: characterised by logic function, e.g. AND, OR, NOR, NOT circuits (H03K19/003 - H03K19/01 take precedence)
- H04B 1/04: Circuits
- H04B 1/16: Circuits
- H04L 27/20: Modulator circuits; Transmitter circuits
- H03F 2203/45528: the FBC comprising one or more passive resistors and being coupled between the LC and the IC
- H04B 2001/6912: {using chirp}
- H04B: TRANSMISSION
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)
- H03F: AMPLIFIERS
- H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P)
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A system and methods for transmission and non-coherent detection of data signals modulated by a plurality of overlapping chirps in a chirp spread spectrum communication system (CSS). Data signals input to an adaptive overlapping transmitter are modulated by a plurality of overlapping chirps and transmitted over a wireless communication system to a non-coherent receiver. The coherent receiver includes a chirp matched filter which matches the chirps to an internal chirp signal, a delay filter which delays each chirp, a multiplier which multiplies each delayed chirp by a next chirp, an integrator which sums the amplitudes of the chirps and decision circuitry which determines the polarity of each sum and outputs a stream of ones and zeroes representing the data signals.

## Claims

### Claim 1

A wireless communication method for modulating data signals with a plurality of overlapping chirps by an adaptive overlapping transmitter in a chirp spread spectrum communication system (CSS), comprising:
receiving a stream of data signals at a first data rate (Rold);
increasing the first data rate of the data signals to a second data rate (Rnew);
encoding the data signals at the second data rate with a phase difference between each two consecutive bits and generating a phase encoded bit stream;
converting the data signals to positive and negative pulses;
generating a plurality of overlapping chirp signals from the positive and negative pulses;
increasing the gain of the chirp signals by a factor equal to the ratio of the second data rate divided by the first data rate and outputting an encoded stream of data signals modulated by a plurality of overlapping chirps;
transmitting the encoded stream in the chirp spread spectrum communications system over a wireless communication channel to a non-coherent receiver.

### Claim 2 (depends on 1)

The wireless communication method of claim 1, comprising:
modulating the positive and negative pulses with a FIR chirp generator which is operatively configured to increase a frequency over a duration of each pulse so that the product of the frequency and the duration equals a processing gain of 54.

### Claim 3 (depends on 1)

The wireless communication method of claim 1, further comprising:
generating the plurality of overlapping chirp signals by modulating the positive and negative pulses with a first positive chirp signal at a first data rate, R1, during a first time period, T1;
modulating the data with a second positive chirp signal at a second data rate, R2, during a second time period, T2;
where R2=1/T1 when T2=T1/2.

### Claim 4 (depends on 1)

The wireless communication method of claim 1, further comprising:
increasing the gain of the plurality of overlapped chirp signals by a factor equal to the second data rate divided by the first data rate (Rnew/Rold).

### Claim 5 (depends on 1)

The wireless communication method of claim 1, further comprising:
performing, by a computing system operatively connected to the adaptive overlapping transmitter, the functions of:
inputting a clock signal to a differential phase converter;
providing bias voltages to a first and second AND gate and an operational amplifier of an antipodal pulse converter;
adjusting a set of first filter coefficients of a FIR chirp generator;
providing voltage to an amplifier; and
providing timing signals to an antenna.