초록 ▼

The establishment of an interactive broadcasting network requires not only a transmission channel from transmitter to receiver but also a transmission channel from receiver to transmitter. A novel method of creating a data feedback channel from receiver to transmitter is implemented in a common freq

The establishment of an interactive broadcasting network requires not only a transmission channel from transmitter to receiver but also a transmission channel from receiver to transmitter. A novel method of creating a data feedback channel from receiver to transmitter is implemented in a common frequency network and involves the use of a transmission procedure in conformity with the DAB standard. Each receiver or user is assigned an identifier which is transmitted in the data feedback channel at specially reserved frequencies to request transmission capacity. A computer then allocates transmission capacity to the receiver. The signals received in the forward channel are evaluated using the synchronization symbols they contain in order to synchronize the transmitter component in the receiver. The novel process can be used in all common frequency networks which use data transmission in conformity with the DAB standard and ensures a particularly economical synchronization in the receiver.

대표청구항 ▼

[ What is claimed is:] [1.] A method for creating a data feedback channel between a receiver and a transmitter in a common frequency network with multi-channel transmission, the method comprising the steps of:a) creating a transmission channel having a number of transmission frequencies a separation

[ What is claimed is:] [1.] A method for creating a data feedback channel between a receiver and a transmitter in a common frequency network with multi-channel transmission, the method comprising the steps of:a) creating a transmission channel having a number of transmission frequencies a separation between transmission frequencies, and a transmission bandwidth;b) creating a feedback channel having a number of feedback frequencies equal to said number of transmission frequencies, a separation between feedback frequencies equal to said separation between transmission frequencies, and a feedback bandwidth equal to said transmission bandwidth, wherein said feedback bandwidth does not overlap in frequency with said transmission bandwidth;c) selecting a number of identifier frequencies from said number of feedback frequencies;d) randomly choosing a carrier frequency from one of said selected number of identifier frequencies;e) modulating a receiver identifier to said carrier frequency;f) transmitting said receiver identifier from the receiver to the transmitter to request transmission capacity from the transmitter;g) assigning a transmission frequency to the receiver in response to said request from the receiver at the transmitter;h) detecting, in the receiver, a transmitted frequency from the transmitter;i) applying, in the receiver, one of frequency division and frequency multiplication to said detected transmitted frequency to generate an allocated feedback frequency; andj) modulating data at said allocated feedback frequency into a COFDM signal, wherein said identifier frequencies are removed from modulation.