A method for continuously optimizing data compression using frequency-based dictionary lookup tables for communication between a transmitter in a vehicle and a receiver is provided. The method comprises the following steps. In a transmitter a first and a second frequency-based dictionary lookup table is provided. The transmitter receives a data block and compresses it using the first table. Using the data block the second table is updated and a difference between a compression efficiency of the first table and a compression efficiency of the second table for the data block is calculated. The compressed data block is transmitted to the receiver. When the difference is more than a pre-defined threshold, the content of the first table is replaced with the content of the updated second table in the transmitter. The content of the updated second table is then also transmitted to the receiver.
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