TDL 300 EO 01.1

Link 16 Radio Transmission

• The CPSM (Chip Sequence Pseudo-Noise Modulation) sequence is used for pulse modulation in Link 16 Radio transmission.
• There are 64 CPSM chips in each transmitted pulse in Link 16 Radio transmission.
• The duration of each pulse in Link 16 Radio transmission is defined by the pulse width, which is 6.4 microseconds.

Pulse Characteristics

• The resulting pulse in Link 16 Radio transmission is 6.4 microseconds wide.

Frequency Hopping

• Frequency hopping in Link 16 Radio transmission is used to reduce the effect of jamming.
• The Anti-Jam feature aims to achieve resistance against jamming in Link 16 Radio transmission.

Link Margin

• Link Margin refers to the difference between the received signal power and the minimum required power to detect the signal in Link 16 Radio transmission.

Reed Solomon EDAC

• Reed Solomon EDAC (Error Detection and Correction) is used for error detection and correction in Link 16 Radio transmission.
• 16 parity bits are added at the end of the encryption process in message encryption.

Symbol Interleaving

• The main purpose of Symbol Interleaving is to reduce the effect of error bursts in Link 16 Radio transmission.

CCSK Encode

• In CCSK encode, each Reed Solomon symbol's 5 bits are represented as a 5-bit symbol.

Crypto Keys

• The TSEC (Transmission Security) crypto key provides encryption for transmission security in Link 16 Radio transmission.
• The MSEC (Multi-level Security) crypto key provides encryption for multi-level security in Link 16 Radio transmission.

Coding

• Forward detection coding in Reed Solomon EDAC is used to detect and correct errors in Link 16 Radio transmission.
• TDMA (Time Division Multiple Access) stands for Time Division Multiple Access in the context of JTIDS/MIDS communication protocol.

TDMA Protocol

• There are 1536 time slots in an epoch in the TDMA protocol used in JTIDS/MIDS.
• Each time slot in the TDMA protocol used in JTIDS/MIDS is subdivided into 4 sub-slots.
• There are 32 frames in each epoch in the TDMA protocol used in JTIDS/MIDS.
• One type of legacy transmission format involves 12 words and 444 pulses.

Unit Types

• Fighter units need more transmit capacity in the TDMA protocol used in JTIDS/MIDS.

Frame Duration

• The duration of a frame in the TDMA protocol used in JTIDS/MIDS is approximately 12.8 milliseconds.

Buffering

• The main purpose of buffering the tracks in the host system is to improve transmission efficiency.

Packing

• Tracks are packed before transmission based on the minimum number of words required for packing, which is 8 words.

Link 16 Enhanced Throughput (LET)

• The main purpose of Link 16 Enhanced Throughput (LET) is to increase the data transmission rate.
• The limitation of implementing Link 16 Enhanced Throughput (LET) is that it requires a hardware upgrade.

LET Mode 1

• 112 data bits are transmitted in LET Mode 1.

JTIDS System

• The NET (Network Entry Terminal) determines who transmits in the JTIDS system.
• The basic unit of access in the TDMA protocol is a time slot.

Anti-Jam Capability

• Frequency hopping and coding contribute to Link 16 anti-jam capability.

Frequency Hopping

• 51 center frequencies, spaced 3 MHz apart, are used in Link 16 frequency hopping.

Coding and Fading

• Reed Solomon coding creates redundancy in Link 16, contributing to anti-jam capability.
• Frequency hopping and delay spread contribute to Link 16's ability to prevent multi-path fading.
• Link 16 occupies the frequency range of 962-1213 MHz.

Pulse Arrival

• Pulses arriving more than 200 nanoseconds later are discarded in Link 16.

Geometry Advantage

• The attribute that provides a geometry advantage and improves the range ratio in Link 16 is the use of JDAMS (Joint Direct Attack Munition System).

Redundancy and Randomness

• The attribute in Link 16 that contributes to the randomness and redundancy against predictor/followers and partial band/time jamming is the use of cryptographic keys.