Mapping apparatus and method for transmission of data in a multi-carrier broadcast system

Abstract

An apparatus and a corresponding method for mapping payload data of mapping input data streams onto a mapping output data stream having a channel bandwidth for transmission in a multi-carrier broadcast system includes first and second frame forming mechanisms. The first frame forming mechanism is adapted to form first frames having a first frame structure and the second frame forming mechanism is adapted to form second frames having a second frame structure. Preferably, in a second frame structure the data blocks of a particular mapping input data stream are spread in time and frequency over various data symbols and various data segments of the second frames to provide high robustness against disturbances. The payload portion of the second frame is preferably segmented into various data segments enabling use of a narrow-band receiver, even if both the first and second frames cover the same total channel bandwidth.

Description

FIELD OF INVENTION[0001]The present invention relates to an apparatus for mapping payload data of mapping input data streams onto a mapping output data stream having a channel bandwidth for transmission in a multi-carrier broadcast system. Further, the present invention relates to a transmission apparatus for transmitting data within a multi-carrier broadcast system. Still further, the present invention relates to corresponding methods, a computer program for implementing said methods on a computer and a computer readable non-transitory medium. Finally, the present invention relates to a frame structure carrying data in a channel of a predetermined channel bandwidth for transmission in a multi-carrier broadcast system.[0002]The present invention relates, for instance, to the field of Digital Video Broadcasting (DVB) utilizing Orthogonal Frequency Division Multiplexing (OFDM). Further, the present invention can generally be applied in other broadcast systems, such as DAB (Digital Aud...

AI Technical Summary

Benefits of technology

[0015]The first frames are designed for reception by a first type of receiver, e.g. a stationary receiver such as a DVB-T2 receiver, while the second frames are designed for reception by a second type of receiver, e.g. a mobile receiver such as a DVB-NGH receiver. To enable, however, the use of narrow-band receivers for receiving and processing the second frames despite both the first and second frames use the same (fixed) channel bandwidth, it is further proposed according to the present invention to apply the concept of band segmentation in the second frame structure. Such a segmentation of the payload portion (which carries the actual payload data) of the second frames, according to which the payload portion is segmented into (two or more) data segments each covering a bandwidth portion of the total channel bandwidth, the power consumption of the used narrow-band receiver can be kept low. Additionally, one fixed receiver tuner bandwidth is sufficient for the reception of all available transmission bandwidths.

[0048]Hence, an essential aspect of the present invention according to which the data blocks of a mapping input data stream are mapped onto a frame such that they are spread in time and frequency over various data symbols and various data segments of the frame can generally also be applied if the mapping output data stream only comprises one type of frames and not only if, as explained above, a mapping output data stream comprises alternately arranged first and second frames of different types and having different frame structures. Thus, according to this aspect, the concept of segmentation of the available bandwidth which allows for reduced power consumption due to the application's narrow-band receivers is also exploited, but a further time and frequency multiplexing of the data blocks (as explained above in a preferred embodiment of the frame structure of the second frames) is additionally applied to achieve the above explained advantages.

Problems solved by technology

However, it is difficult for a mobile receiver to receive larger bandwidths up to 20 MHz due to its limited processing power.

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