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Underwater acoustic OFDM superposition coding receiving method

A technology of superposition coding and receiving method, which is applied in the field of underwater acoustic OFDM superposition coding and reception, and can solve the problems of low spectral efficiency of CDMA

Inactive Publication Date: 2020-03-31
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the receiving end does not introduce complex demodulation algorithms, the spectral efficiency of CDMA will be lower than that of the orthogonal multiple access method

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  • Underwater acoustic OFDM superposition coding receiving method
  • Underwater acoustic OFDM superposition coding receiving method
  • Underwater acoustic OFDM superposition coding receiving method

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Embodiment Construction

[0074] The following examples describe the present invention in more detail.

[0075] The underwater acoustic OFDM superposition coding receiving method of joint Turbo equalization and continuous interference elimination of the present invention specifically includes:

[0076] 1. Superimpose the data of downlink near-end user N and far-end user F

[0077] use Represents constellation sets of different users, where i=N, F, SC represent near-end users, far-end users and superposition users respectively. [Q i ] represents the number of bits contained in the constellation point of the i-th user. Represents the jth bit carried on the kth subcarrier of the ith user. User N is closer to the sound source node, while user F is farther away from the sound source node, so the channel condition of user N is better than that of user F. in the sequence of information and After encoding, interleaving and digital modulation respectively, the information symbols of the two users are...

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Abstract

The invention provides an underwater acoustic OFDM superposition coding receiving method. The method comprises: the step 1, performing MMSE superposition equalizer multi-user information detection; the step 2, calculating external logarithm likelihood ratio information of different users; the step 3, reconstructing the far-end information, and carrying out the continuous interference elimination;and the step 4, carrying out Turbo equalization on the remaining near-end user information components by using a near-end MMSE equalizer. According to the method, a Turbo equalization means is combined, the bit error rate can be effectively reduced, the communication quality can be improved, and compared with traditional one-time equalization, the method is advantageous in that turbo equalizationhas stronger detection capability due to iterative external soft information exchange between a soft decision feedback equalizer and a soft decision channel decoder. According to the method, the inter-user information interference can be eliminated, the inter-symbol interference of single user information can also be eliminated, the robustness of the system is greatly improved, and the influence of an underwater acoustic channel on the communication quality is effectively reduced.

Description

technical field [0001] The invention relates to a multiple access method for underwater acoustic downlink communication, in particular to an underwater acoustic OFDM superposition coding receiving method combined with Turbo equalization and continuous interference elimination. Background technique [0002] Traditional underwater acoustic communication is mainly based on point-to-point communication. With the expansion of underwater communication scale, the research on underwater acoustic communication network is gradually increasing. The research on underwater acoustic communication gradually transitions from point-to-point underwater acoustic communication technology to multi-user underwater network communication technology. However, in actual underwater acoustic communication, the severe limitation of communication bandwidth is one of the main bottlenecks to improve the data transmission rate of underwater networks. How to improve the spectrum utilization of physical layer...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L27/26H04L1/00H04B13/02H04B11/00
CPCH04L25/03006H04L27/2647H04L27/2649H04L1/0056H04L1/0048H04L1/0054H04L1/005H04L1/0071H04B13/02H04B11/00H04L2025/03414H04L2025/03636
Inventor 马璐刘新宇乔钢
Owner HARBIN ENG UNIV