Patent ID: 8031796

Claim:
A device for transmitting an information signal comprising several transmit signals, comprising: a modulator for generating a first transmit signal and a second transmit signal, wherein the first transmit signal is transmittable via a first spatial emitter, and wherein the second transmit signal is transmittable via a second spatial emitter, wherein the modulator comprises: an OFDM control stage adapted to load a first group of OFDM carriers with first information to generate the first transmit signal, and to load a second group of OFDM carriers with second information to generate the second transmit signal, wherein the first group of OFDM carriers differs from the second group of OFDM carriers, and wherein the first information differs from the second information; a first antenna adapted to emit the first transmit signal into a first spatially limited area; a second antenna adapted to emit the second transmit signal into a second spatially limited area, wherein the first area is defined in that, in the first area, the first transmit signal emitted by the first antenna is receivable with a field strength larger than a predetermined first threshold field strength, and wherein the second area is defined in that, in the second area, the second transmit signal emitted by the second antenna is receivable with a field strength larger than a predetermined second threshold field strength, wherein the first antenna and the second antenna are adapted so that the first area and the second area overlap; wherein the OFDM control stage is adapted so that, in the second transmit signal, there is included at least one commonly used group of OFDM carriers also included in the first transmit signal; wherein the OFDM control stage is further adapted to load the commonly used group of OFDM carriers in the first transmit signal and in the second transmit signal with the same common information; wherein the OFDM control stage is adapted to generate the first transmit signal so that, in the first transmit signal, there is included a group of OFDM carriers that is inactive in the second transmit signal; and wherein the OFDM control stage is adapted to generate the second transmit signal so that, in the second transmit signal, there is included a group of OFDM carriers that is inactive in the first transmit signal.