Spinal Codes

Technical Explanation

In rapidly fluctuating 6G mobile channels, traditional fixed-rate codes require frequent channel state feedback (CQI) to select code rates; if the channel fades unexpectedly, the packet is lost. Spinal Codes are rateless: the transmitter uses a pseudo-random hash function over the message bits to generate a continuous spinal sequence of coded symbols. The receiver decodes as soon as it has accumulated enough symbols, automatically matching channel capacity without any prior channel state knowledge.

Key Functions

• Rateless error-correcting code that automatically adapts to unknown, rapidly fading channels
• Transmitter generates a continuous spinal symbol stream until receiver sends a 1-bit ACK
• Completely eliminating complex channel state information (CSI/CQI) feedback overhead
• Achieving capacity on Gaussian and fading channels with polynomial-time decoding
• Ideal for volatile non-terrestrial satellite links and high-speed vehicular communications