Detection method for the transmitter identification...

Details Detection method for the transmitter identification... Detection method for the transmitter identification...

H - Electricity

04

B

H04B 1/16 (2006.01) H04L 27/00 (2006.01) H04H 1/00 (2006.01)

Patent

CA 2246824

A DAB stream starts with a so-called null symbol for the receiver synchroniza- tion carrying a transmitter identification information, i.e. TII, signal. Each transmitter in the single frequency network is assigned a main id and a sub id for unique identification. This identification is mapped to a certain pattern with 16/8/4/2 set carrier pairs in the spectrum of the null symbol according to the DAB modes I-IV. Based on mode II which has 384 valid carriers a so called comb block is defined. For modes I and IV this block is repeated 4 and 2 times, respectively. For mode III only a half block is available. This pattern is transmitted every 2nd DAB frame in the null symbol. To detect the set carriers the steps of differential demodulation of TII pairs in-cluded in the spectrum (S1(.omega.)) of every second null symbol of the incoming DAB stream (S1, S2, S3) to respectively obtain a demodulated null symbol, correction of carrier phases of the demodulated null symbol spectrum (S4), de-termination of a threshold. (S7), and decision if a carrier is set or not by com-paring the carrier level to the determined threshold (56) are performed.

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