Abstract: A communications system includes a sender device configured to send data packets in accordance with a Transmission Control Protocol (TCP) to a receiver device. An intermediate device is coupled between the sender device and the receiver device and includes a wireless transceiver configured to provide a communications link between the sender device and the receiver device and wherein said communications link is susceptible to at least one of transmission delays and transmission errors. A controller is coupled to the wireless transceiver and configured to serve as a TCP proxy between the sender device and the receiver device by sending successive simulated TCP acknowledgements of delivery to the sender device starting at a delay time shorter than a TCP retransmission timeout period and increasing for each successive simulated TCP acknowledgement.

Abstract: A communications system includes a sender device configured to send data packets in accordance with a Transmission Control Protocol (TCP) to a receiver device. An intermediate device is coupled between the sender device and the receiver device and includes a wireless transceiver configured to provide a communications link between the sender device and the receiver device and wherein said communications link is susceptible to at least one of transmission delays and transmission errors. A controller is coupled to the wireless transceiver and configured to serve as a TCP proxy between the sender device and the receiver device by sending successive simulated TCP acknowledgements of delivery to the sender device starting at a delay time shorter than a TCP retransmission timeout period and increasing for each successive simulated TCP acknowledgement.

Abstract: An HF communication system includes a first device, and a second device. The first device sends a message to the second device, the message including a preamble portion, a variable length data portion after the preamble portion having a given ending point selected from among potential ending points, and a check portion after the variable length data portion indicating an end of the message. The second device performs a decoding operation on the message at a potential ending point, and performs a check operation on a potential check portion of the decoded message, and when the check operation is successful, recovers the variable length data portion from the decoded message. Otherwise, the second device performs another decoding operation on the message at a next potential ending point, and performs another check operation on another potential check portion of the respective decoded message.

Abstract: An HF radio ALE communication system may include a first HF radio communications device including a first HF radio transceiver and a first controller coupled thereto, and a second HF radio communications device including a second HF radio transceiver and a second controller coupled thereto. The first controller may cooperate with the first HF radio transceiver and may be configured to use ALE to establish a narrowband communication link with the second HF radio communications device, and to communicate a wideband message probe to the second HF radio communications device. The second controller may cooperate with the second HF radio transceiver and may be configured to determine at least one channel characteristic based upon the wideband message probe. The first controller may cooperate with the first HF radio transceiver and may be configured to update the narrowband communication link based upon the at least one channel characteristic.

Abstract: An HF radio ALE communication system may include a first HF radio communications device including a first HF radio transceiver and a first controller coupled thereto, and a second HF radio communications device including a second HF radio transceiver and a second controller coupled thereto. The first controller may cooperate with the first HF radio transceiver and may be configured to use ALE to establish a narrowband communication link with the second HF radio communications device, and to communicate a wideband message probe to the second HF radio communications device. The second controller may cooperate with the second HF radio transceiver and may be configured to determine at least one channel characteristic based upon the wideband message probe. The first controller may cooperate with the first HF radio transceiver and may be configured to update the narrowband communication link based upon the at least one channel characteristic.