Multi-antenna iteration multi-user detection method and device in complex time varying multi-path channel

A multi-user detection and multi-antenna technology, applied in digital transmission systems, electrical components, error prevention, etc., can solve problems such as complex channel environment and large channel differences

Inactive Publication Date: 2014-02-12
FUDAN UNIV
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Problems solved by technology

However, these assumptions are too idealistic, and are far from the actual research channel environment, especially the complex channel like wireless body area network.

Method used

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  • Multi-antenna iteration multi-user detection method and device in complex time varying multi-path channel
  • Multi-antenna iteration multi-user detection method and device in complex time varying multi-path channel
  • Multi-antenna iteration multi-user detection method and device in complex time varying multi-path channel

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Embodiment Construction

[0080] For the iterative detection scheme proposed by the present invention, the specific implementation process is as follows:

[0081] 1. By figure 1 , We know that there are K users at the sending end, and the original information bit stream generated by them is K-th user input data First enter the encoder for encoding, and complete the forward error correction coding and sequence spreading process in the encoder part. Generate low bit rate =1,2,3,……, . After the interleaver corresponding to k users , Generate the corresponding chips (chips) , =1,2,3,……, . The signals of each channel are superimposed and sent.

[0082] 2. By figure 2 It can be seen that after the transmitted signal passes through the AWGN channel, it is a signal with noise and various interference signals, so it enters the receiving end to start the iterative noise elimination process. The iteration process is as follows.

[0083] First define for any , Extrinsic maximum likelihood ratio (...

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Abstract

The invention belongs to the technical field of wireless communication, and particularly relates to a multi-antenna interleave iteration multi-user detecting method and device in a complex time varying multi-path channel. The detecting device comprises a transmitter under a multi-user mode and an iterative receiver under the multi-user mode. The transmitter completes the processes that data are input into corresponding chips by users and information streams of the chips are transmitted to the channel. The receiver is formed by a suboptimal Turbo-type iterative decoding structure and comprises an ESE module, a DEC module and two interleavers, noise signals in received mixed signals are completed removed through loop iteration, and information sequences respectively output by a decoder module are taken as hard decision values corresponding to K user signals. The multi-antenna interleave iteration multi-user detecting method and device in the complex time varying multi-path channel can reduce channel coding difficulty to a large extent, and probabilities for processing different channels in various environments of a wireless body area network is provided. The complexity of the interleave iteration detection of multiple users is not restricted by the number of the users any more, and the multi-antenna interleave iteration multi-user detecting method and device in the complex time varying multi-path channel well adapted to body area network communication sections.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a multi-antenna interleaving iterative multi-user detection method and device in complex time-varying multi-path channels. Background technique [0002] MIMO interleaving iterative technology can make the sum of other user information relative to this user be considered as white noise conforming to Gaussian distribution, so that the iterative detection operation is no longer related to the number of users, which greatly simplifies the complexity of multi-user detection and reduces Requirements for computing power of communication nodes. It has a good application prospect in multi-user communication, and it releases the limitations of low computing power and low power consumption of sensor nodes in the wireless body area network system [0003] In the usual iterative detection process, for a multi-user single-path channel, it is generally assumed that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7105H04L1/00
Inventor 周小林蔡荣成祁卿峰
Owner FUDAN UNIV
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