Abstract: A channel equalizer includes an overlap unit, an estimator, a calculator, a compensator, and a save unit. The overlap unit overlaps a group of data packets in a broadcast signal. The group data packets include a head, a body, and a tail, and a known data sequence is periodically included in the body. The estimator estimates a CIR of each data region the body using the known data sequence, and it further estimates CIRs of data regions in the head or tail using the CIRs obtained for the data regions in the body. The calculator calculates equalization coefficients based on the CIRs estimated by the estimator, and the compensator compensates channel distortion of the overlapped data using the equalization coefficients. The save unit saves the compensated data.

Abstract: The transmission device comprises a transmission unit (1) having a plurality of useful lasers (3b to 3m), which are arranged in a row (2) and emit useful radiation vertically with respect to the covering area (1b) of the transmission unit. In order to regulate the useful radiation power, a monitor receiver (20a) is arranged on a mounting plane (26a) which is laterally adjacent to the transmission unit (1) and lies above the covering area (1b). The monitor receiver projects above an assigned monitoring laser (3a) like a cantilever support in such a way that its radiation-sensitive area (23a) is opposite the optically active zone (4a) of the monitoring laser (3a).