MUSA system multistage portion parallel interference elimination multi-user detection method

A multi-user detection and interference cancellation technology, which is applied in the field of multi-level partial parallel interference cancellation multi-user detection of MUSA system, can solve the problems that cannot meet 5G mass connections, high spectral efficiency, and low general spectral efficiency of orthogonal multiple access access. , to improve performance and complexity, and reduce complexity

Active Publication Date: 2016-10-26
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Orthogonal multiple access is proportional to the number of access users and orthogonal resources, and orthogonal multiple access generally has low spectral efficiency, so it cannot meet the requirements of 5G mass connections and high spectral efficiency.

Method used

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  • MUSA system multistage portion parallel interference elimination multi-user detection method
  • MUSA system multistage portion parallel interference elimination multi-user detection method
  • MUSA system multistage portion parallel interference elimination multi-user detection method

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Embodiment Construction

[0029] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] figure 1 Shown is the uplink schematic diagram of the MUSA system. First, K access users spread their modulation symbols by using complex domain multivariate sequences with low cross-correlation as spreading sequences, then, the extended symbols of K users are sent in the same time-frequency resource, and finally, at the receiving end , use the corresponding detection method to demodulate and recover the information of each user. The received signal after passing through the channel can be expressed as:

[0031] y = Σ k = 1 K h k s k x k + n

[0032] Among ...

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Abstract

The present invention relates to a multi-user shared access (MUSA) system multistage portion parallel interference elimination multi-user detection method, belonging to the field of the communication technology. The method comprises the following steps: S1: sorting access users according to the good and bad states of users' channels; S2: receiving signals after sorting, and performing MMSE detection of the receiving signals y passing through the channels; S3: taking the output of the MMSE detector as the input of a first grade PIC detector; S4: reconstructing all the users' interference signals according to the determination values of the output results of the PIC; and S5: outputting stronger users' data according to the user ordering condition, and performing MMSE-PIC detection again of the weaker users. The MUSA system multistage portion parallel interference elimination multi-user detection method can effectively reduce the complexity of the detection method in the condition without reducing the system symbol error rate, and the symbol error rate performance and the complexity are improved compared to a traditional multistage MMSE-PIC detection method.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a multi-stage partial parallel interference elimination multi-user detection method of a MUSA system. Background technique [0002] The mobile Internet and the Internet of Things are the two main driving forces for the development of mobile communications in the future. Therefore, the number of mobile terminals will show explosive growth in the future. The fifth-generation mobile communication system must meet the characteristics of massive connections, low latency and high reliability. . The upgrade of each generation of mobile communication will be accompanied by the evolution of multiple access technology. Most of the existing communication systems adopt the orthogonal multiple ) Orthogonally divided resources to access. For example, the OFDMA adopted in the 4G system divides the transmission bandwidth into orthogonal subcarrier sets, and then allocates different subcarr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L1/00
CPCH04L1/0048H04L25/03305
Inventor 邵凯武汉
Owner CHONGQING UNIV OF POSTS & TELECOMM
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