A radio analyzer includes a memory configured to store a first reference signal, and a processor coupled to the memory and configured to calculate a first correlation value between a received wave and a non-modulated wave, calculate a second correlation value between the received wave and the first reference signal in a target section of the received wave, the first correlation value being smaller than a first threshold value in the target section, and detect a modulated wave from the received wave based on the second correlation value.

A system and method for a tamper-resistant network is disclosed. The system includes a primary network hub (PNH) having a PNH transceiver and a PNH microcontroller. The PNH microcontroller has long range spread spectrum frequency hopping (SSFH) firmware, a plurality of frequency hopping sequences, and PNH tamper firmware. The system also includes a peripheral device (PD) having a PD transceiver, a PD tamper circuit, and a PD microcontroller. The PD microcontroller includes the long range SSFH firmware, the plurality of frequency hopping sequences, and PD tamper firmware. The PD communicates to the PNH that it is compromised, and the PNH deactivates the PD and an associated frequency hopping signal.

The present invention teaches a system and method for secure network access and group membership in a cooperative network of digital chaos transmissions. The invention involves sensing generated digital chaos sequences as spreading sequences at a transmit side and determining the availability of open channels at a receive side. Further, a broadcast request to join frame from a node on an open channel is transmitted to network manager or coordinator. A network manager or coordinator sends an association/authentication packet, comprised of the reserved digital chaos associated to the unique device id, in response to the request to join frame from a node with a valid identification.

Methods and apparatus are provided. In an example aspect, a method in a first wireless communication device of transmitting data is provided. The method includes determining that each of a plurality of frequency ranges is free for a transmission by the first wireless communication device, selecting one or more of the frequency ranges, and transmitting the data using one or more frequency ranges other than the selected one or more frequency ranges.

Methods and apparatus are provided. In an example aspect, a method of transmitting a signal is provided. The method includes transmitting a frequency hopping signal on a first plurality of frequency channels in a first bandwidth using a first interference detect and avoid (DAA) scheme for each of the plurality of frequency channels, detecting interference in a predetermined proportion of the first plurality of frequency channels, and transmitting the frequency hopping signal on a second plurality of frequency channels in a second bandwidth smaller than the first bandwidth without using the first interference DAA scheme in response to detecting interference in the predetermined proportion of the first plurality of frequency channels.

A system and method for enhancing RF signal jamming. The method includes steps of pre-distorting an input signal to define a pre-distorted signal; adjusting a voltage of a power supply of a power amplifier based upon the pre-distorted signal to envelope track; power sequencing the power amplifier to power up and power down the amplifier; achieve a low probability of intercept of the signal, and transmitting the adjusted signal. Systems are other methods are likewise disclosed.

A method of performing a downlink machine type communication from a base station to a MTC (machine type communication) terminal includes, at the base station, transmitting at least one of a system informationthe system information excluding a Master Information Block (MIB), a control information and data to the MTC terminal using a system bandwidth having a predetermined size. The base station performs frequency hopping using a frequency hopping pattern in a unit of narrow band on the at least one of the system informationthe system information excluding a Master Information Block (MIB), the control information and the data to transmit to the MTC terminal, and the narrow band is less than the system bandwidth.

A method of performing a downlink machine type communication from a base station to a MTC (machine type communication) terminal includes, at the base station, transmitting at least one of a system informationthe system information excluding a Master Information Block (MIB), a control information and data to the MTC terminal using a system bandwidth having a predetermined size. The base station performs frequency hopping using a frequency hopping pattern in a unit of narrow band on the at least one of the system informationthe system information excluding a Master Information Block (MIB), the control information and the data to transmit to the MTC terminal, and the narrow band is less than the system bandwidth.

The present invention teaches a system and method for improved signal recovery for range and coverage extension in a heterogeneous cooperative network of digital chaos transmissions with OFDM component signal transmission. The invention improves upon the state of art in side channel information from the transmit side containing information on the clipped amplitude. In-band transmission of the side information is achieved by exploiting the sparsity of the resulting clip amplitude position with improved levels of compression over the prior art using Gabor Transform Multiple Symbol Encoding transmitter. The information rate of the clipped amplitude is sub-Nyquist relative to the original OFDM component signal transmission, which allows very low power spreading by a cooperative digital chaos sequences at a transmit side and recovery of the clipped amplitude at a receive side. Further, an improved noise resistance side channel performance is achieved by decoding Gabor Transform symbols for symbol recovery.

The present invention teaches a system and method for improved signal recovery for range and coverage extension in a heterogeneous cooperative network of digital chaos transmissions with OFDM component signal transmission. The invention improves upon the state of art in side channel information from the transmit side containing information on the clipped amplitude. In-band transmission of the side information is achieved by exploiting the sparsity of the resulting clip amplitude position with improved levels of compression over the prior art using Gabor Transform Multiple Symbol Encoding transmitter. The information rate of the clipped amplitude is sub-Nyquist relative to the original OFDM component signal transmission, which allows very low power spreading by a cooperative digital chaos sequences at a transmit side and recovery of the clipped amplitude at a receive side. Further, an improved noise resistance side channel performance is achieved by decoding Gabor Transform symbols for symbol recovery.