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Joint detection and decoding method of ldpc code in mimo channel

A technology of LDPC code and joint detection, which is applied to the shaping network, digital transmission system, and baseband system components in the transmitter/receiver, and can solve the problem of poor MIMO channel conditions, unreliable information transmission process, and bit errors in communication systems High efficiency and other issues, to achieve optimal balance performance, enhance flexibility, and improve performance

Active Publication Date: 2019-11-12
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The conditions of MIMO channels are usually harsh, and the existence of channel fading and noise makes the information transmission process unreliable, resulting in a high bit error rate in the communication system
In order to distinguish and restore the data transmitted by different antennas at the receiving end, most of the existing equalization algorithms require the known channel impulse response matrix at the receiving end, which restricts the flexibility of the algorithm

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  • Joint detection and decoding method of ldpc code in mimo channel
  • Joint detection and decoding method of ldpc code in mimo channel
  • Joint detection and decoding method of ldpc code in mimo channel

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Embodiment Construction

[0039] Below in conjunction with accompanying drawing, the algorithm proposed by the present invention will be further described:

[0040] The present invention is mainly the joint semi-blind equalization and decoding technology under the flat fading channel, and the system model is as attached figure 1shown. The binary information sequence f passes through the LDPC encoder to obtain the code word c, and then passes through the modulator to obtain the modulation symbol s. After adding the pilot symbol p in front of the modulation symbol s, the data is transmitted through the MIMO channel. The transmitted signal x will be interfered by additive Gaussian white noise w during transmission, and the received signal y obtained in this way will be seriously distorted. Therefore, the received signal y at the receiving end is first processed by the equalizer, and then the LDPC decoder decodes the output sequence z of the equalizer, and finally restores the binary information sequence...

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Abstract

The invention discloses a joint detection and decoding method for an LDPC (Low Density Parity Check) code under an MIMO (Multiple-Input Multiple-Output) channel. A channel balancer of which structure is the same to that of an MIMO channel impulse response matrix is established; and through utilization of a linear programming LP method, under a linear constraint condition of a balancer parameter and a c odon bit stream, a balancer coefficient is optimized, thereby realizing the optimum balancing purpose. Compared with an existing Turbo balancing algorithm based on channel estimation, the algorithm provided by the invention has the advantage that the system performance is remarkably improved under the condition that the number of pilots is relatively low.

Description

technical field [0001] The invention belongs to the technical field of digital wireless communication, and in particular relates to a joint detection and decoding algorithm of LDPC codes under MIMO channel. Background technique [0002] With the rapid development of wireless communication technology, researchers have proposed a multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO) system, the main feature of which is the use of multiple transmitting antennas and receiving antennas at the transmitting end and receiving end of the communication system . The MIMO system can make full use of space resources, realize multiple transmission and multiple reception through multiple antennas, and can double the system capacity without increasing spectrum resources and antenna transmission power. In the flat fading MIMO channel, the received signal is superimposed by signals from different transmit antennas, which will cause severe inter-symbol interference. In order ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L25/03
CPCH04L1/0048H04L25/03891
Inventor 黎勇李程刘宏清
Owner CHONGQING UNIV OF POSTS & TELECOMM