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Non-orthogonal-multiple-access-based downlink signal receiving method

A non-orthogonal multiple access and downlink technology, applied in multi-carrier systems, digital transmission systems, electrical components, etc., can solve problems such as high complexity and long delay

Active Publication Date: 2016-07-20
CHONGQING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the SIC receiver adopts a multi-level processing structure, each level must perform signal detection, demodulation, decoding, and then restore the interference signal, which has relatively high complexity; in addition, each level of processing will bring time delay , after multi-stage processing, the total delay is relatively large

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Embodiment Construction

[0045] Below in conjunction with accompanying drawing, the present invention will be further described:

[0046] figure 2 It is a flowchart of a non-orthogonal multiple access downlink signal receiving method and device of the present invention. according to figure 2 As shown, it can be known that the embodiment specifically includes the following processes:

[0047] Such as figure 1 , assuming that in the NOMA downlink, the transmitting end and the receiving end adopt the mode of single transmission and double reception, among the users UE-n (n=1, 2) on the subband B, the user UE-1 is close to the center of the cell, and the user UE-1 is far away from the cell The user UE-2 in the center performs independent modulation at the sending end, wherein UE-2 adopts QPSK, and UE-1 adopts 16QAM.

[0048] The first step is to perform OFDM demodulation on the two receiving antennas at the receiving end and then perform diversity combining. Here, the MRC combining method is selecte...

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Abstract

The invention makes a request of protection of a non-orthogonal-multiple-access-based downlink signal receiving method. The method comprises: orthogonal frequency division multiplexing (OFDM) demodulation is carried out on receiving signals of all receiving antennas, diversity combining is carried out on demodulated signals, a combined constellation diagram is constructed according to a user signal power and a modulation way; and before detection on a certain user signal, a corresponding modulation bit position of an information bit in a constellation point is calculated, a soft information log likelihood ratio (LLR) value of the information bit of the user signal is calculated, and then the LLR value of the user information bit is inputted into a decoder to carry out decoding to complete user signal receiving. According to the provided combined detection method, the complexity and processing time delay of the receiver can be substantially reduced under the circumstance that the performance loss is low.

Description

technical field [0001] The present invention relates to non-orthogonal multiple access (NOMA, Non-Orthogonal Multiple Access) technology in the field of mobile communication, in particular to a non-orthogonal multiple access downlink signal receiving method and device. Background technique [0002] With the popularization of smart terminals and the development of new mobile services such as the Internet of Things and cloud services, the demand for wireless network applications is growing explosively. The new generation of mobile communication system 5G has put forward higher requirements for system capacity and spectrum efficiency. . Facing the requirements of the new generation of wireless networks, the traditional multiple access technology can no longer meet the requirements, so the industry proposes the non-orthogonal multiple access technology. [0003] The basic idea of ​​NOMA is to use non-orthogonal transmission to actively introduce interference information. The t...

Claims

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Application Information

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IPC IPC(8): H04L27/34H04L27/38
CPCH04L27/3411H04L27/3483H04L27/38
Inventor 王茜竹唐超林峰彭大芹雒江涛吴广富
Owner CHONGQING UNIV OF POSTS & TELECOMM