A mt-mfsk underwater acoustic communication method with high frequency band utilization
A technology of underwater acoustic communication and utilization rate, which is applied in the direction of multi-frequency code system, FM carrier system, and forward error control, and can solve the problems of MT-MFSK reliability reduction and other issues
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Embodiment 1
[0092] Such as figure 1 As shown, the structure diagram of MT-MFSK underwater acoustic communication data packet with high frequency band utilization, each data packet is composed of packet synchronization, J data frames and tail synchronization.
[0093] Such as figure 2 As shown, the structure diagram of MT-MFSK underwater acoustic communication data frame of high frequency band utilization, each data frame is composed of frame synchronization, front guard interval, I multi-carrier symbols and post guard interval.
[0094] Such as image 3 As shown, the high frequency band utilization MT-MFSK underwater acoustic communication transmission flow chart, the high frequency band utilization MT-MFSK underwater acoustic communication transmission process includes the following steps:
[0095] First, the source bit stream is grouped, each group has L bits, and the L bits of any bit group are expressed as [a (1) ,...,a (L) ], the value is 0 or 1. The L bits of each group underg...
Embodiment 2
[0115] Table 1 provides a specific application example, the value of each parameter:
[0116] Table 1
[0117]
[0118] Such as image 3 As shown, the high-band utilization MT-MFSK underwater acoustic communication transmission process includes the following steps:
[0119] Step S1, grouping the information source bit stream, each group has 15104 bits.
[0120] Step S2, for each bit packet, calculate the CRC16 checksum, and add the 16-bit checksum to the end of the bit packet.
[0121] Step S3, splitting the bit packet after the CRC16 check is added into 2520 6-bit combinations, and each 6-bit combination forms a 64-ary symbol.
[0122] In step S4, perform 64 (7560, 2520) irregular repetitive accumulation coding on the 2520 64 symbols, and output 7560 64 symbols.
[0123] Such as Figure 4 As shown, for 2 M Base (L o , L i ) Irregular repeated accumulation coding, there is a p ∈GF(2 M )(0≤p≤L i -1) and b q 、c q 、d q 、e q ∈GF(2 M )(0≤q≤L o -1). Encoder inpu...
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