High throughput Communications system for End of Train and Head of Train Communications
OwnerThanongsak Himsoon, Wipawee Siriwongpairat +1inventors
InventorsThanongsak Himsoon, Wipawee Siriwongpairat, Mark Davies
Life of this patent
Estimating the term…
Abstract
Disclosed below are various methods and apparatus that enable a more efficient EOT/HOT communication system for a 12.5 kHz channel in the 450 MHz frequency band, which complies with legal and regulatory limits and emissions mask requirements. Such a system is capable of data rights higher than the 1200 bps of the legacy 450 MHz radios that use the legacy FFSK-over FM modulation. Examples of higher data rate modulations include, but not limited to, FFSK, DQPSK, and D8PSK modulations.
Claims19
A communication system for wirelessly communicating between an end of train (EOT) area of a train and a head of train (HOT) area message data from a railroad application in a narrowband channel in a 450 MHz frequency band, the system comprising:
- at least one digital radio comprising a transmitter and a receiver;
- wherein the transmitter is configured to modulate according to a digital modulation scheme and transmit wirelessly data packets having a predetermined format in the narrowband channel at a data rate higher than 1200 bps;
- and
- wherein the receiver is configured to receive wirelessly transmitted data packets and demodulate the data packets according to the digital modulation scheme;
- wherein the digital modulation scheme is from a group of modulation schemes consisting of FFSK, FFSK with digital FM modulation, DQPSK modulation, Pi/4 DQPSK over FM modulation, and D8PSK modulation.
A method for wireless communication between an end of train (EOT) area and a head of train (HOT) area comprising:
- determining whether a narrowband channel in a 450 MHz frequency band is idle;
- if the channel is idle, immediately transmitting a data packet using a digital modulation scheme at a data rate higher than 1200 bps while complying with applicable emission mask requirements, the digital modulation scheme is from a group of digital modulation schemes consistent of a FFSK, FFSK with digital FM modulation, DQPSK modulation, Pi/4 DQPSK over FM modulation, and D8PSK modulation;
- and
- if the channel is busy, rescheduling transmission of the data packet for a later time.
A software defined radio for wirelessly communicating between end of train (EOT) and head of train (HOT) areas of a train, comprising a transmitter and a receiver, each configured to transmit and receive data packets in a narrowband channel in a 450 MHz frequency band;
- wherein the transmitter comprises a modulator configured to modulate data packets using a digital modulation scheme with a data rate greater than 1200 bps while complying with FCC emissions mask requirements and the receiver comprises a demodulator configured to demodulate received data packets modulated using the digital modulation scheme;
- and
- wherein the digital modulation scheme is selected from a group of digital modulation schemes consisting of a FFSK, FFSK with digital FM modulation, DQPSK modulation, Pi/4 DQPSK over FM modulation, and D8PSK modulation.
Dependencies are inferred from the claim text.