Patent ID: 8068452

Claim:
A cooperative transmission system applied in a digital broadcasting single frequency network, comprising: a first double-layer cooperative transmission structure with same frequency, and a second double-layer cooperative transmission structure with same frequency, which are vertically aggregated together; wherein each of the double-layer cooperative transmission structures with the same frequency comprises: a main transmission layer, comprising several main transmitters having the same transmitting frequency; an auxiliary transmission layer, comprising several auxiliary transmitters having the same transmitting frequency; wherein, in each of the double-layer cooperative transmission structures with the same frequency, a coverage range of electromagnetic wave transmitted by the main transmitters is larger than the coverage range of electromagnetic wave transmitted by the auxiliary transmitters; and there is an electromagnetic wave transmitted by at least one of the auxiliary transmitters in the coverage range of the electromagnetic wave transmitted by one main transmitter; the electromagnetic wave transmitted by the main transmitters and the electromagnetic wave transmitted by the auxiliary transmitters have the same frequency, carry the same information symbols and meet a synchronization relationship required for avoiding inter-symbol interference; the electromagnetic wave transmitted by the main transmitters in the first double-layer cooperative transmission structure with the same frequency and the electromagnetic wave transmitted by the main transmitters in the second double-layer cooperative transmission structure with the same frequency have different frequencies.