Construction method of full duplex relay system based on sparse code multiple access

A sparse code multiple access and relay system technology, applied in transmission system, digital transmission system, duplex signal operation and other directions, can solve the problem that OFDMA system is difficult to meet the requirements of spectral efficiency and transmission rate.

Active Publication Date: 2016-05-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem that the traditional OFDMA system is difficult to meet the requirements for spectrum efficiency and transmission rate in 5

Method used

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  • Construction method of full duplex relay system based on sparse code multiple access
  • Construction method of full duplex relay system based on sparse code multiple access
  • Construction method of full duplex relay system based on sparse code multiple access

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specific Embodiment approach 1

[0041] Specific embodiment 1: A method for constructing a full-duplex relay system based on sparse code multiple access in this embodiment is characterized in that the full-duplex relay system based on sparse code multiple access The build method of is implemented in the following steps:

[0042] Step 1. Using sparse code multiple access, user A J Encode the information and send it to the relay station;

[0043] Step 2: The relay station uses full-duplex mode to send and receive information, and eliminates the interference from the feedback, and then forwards the information to user B J ;

[0044] Step 3. User B J After receiving the signal forwarded by the relay station, perform corresponding decoding to obtain user A J information sent.

specific Embodiment approach 2

[0045] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that it is characterized in that the step 1 adopts the method of sparse code multiple access, and user A J Encode the information and send it to the relay station according to the following steps:

[0046] Step 11. It is assumed that the sparse code multiple access system SCMA has J users, wherein J≥1; each user sends information respectively, and the transmitted information bit sequence is subjected to forward error correction coding (FEC), and then interleaved;

[0047] All symbols in the structure of the SCMA system user transmitter use superscripts to distinguish different users, and subscripts to distinguish elements in the vector; for the jth user in the sparse code multiple access system, the transmitted The information bit sequence is Where 0≤j≤J-1, and N is the frame length; forward error correction coding is performed on the information bit sequence, that is, random er...

specific Embodiment approach 3

[0053] Specific embodiment 3: This embodiment differs from specific embodiment 1 or 2 in that it is characterized in that the relay station in step 2 uses a full-duplex mode to send and receive information, and performs interference elimination on self-feedback interference, and then forwards the information to user B J Follow the steps below to achieve this:

[0054] The signal y received by the full-duplex relay station w Perform amplification and forwarding, and use the least mean square algorithm LMS based on time-domain interference cancellation to cancel the interference;

[0055] The self-feedback channel is estimated by using the delayed samples of the transmitted signal and the transmitted signal; in the self-feedback interference cancellation module, w(n)=[w 0 (n),w 1 (n)...w L-1 (n)] T is the adaptive filter coefficient, where w k (n) is the kth element of the filter at the nth moment, and L is the order of the filter;

[0056] At the nth moment, the signal r...

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Abstract

The invention provides a construction method of a full duplex relay system based on sparse code multiple access, and belongs to the field of communications. The invention aims to solve the problem of difficulty in meeting the requirements of spectrum efficiency and transmission rate in 5G in a conventional OFDMA (Orthogonal Frequency Division Multiple Access) system, and further provides a construction method of an interference cancellation full duplex relay system based on the sparse code multiple access. The construction method of the full duplex relay system based on the sparse code multiple access is implemented by the following steps that: I, a user A<J> encodes information in a sparse code multiple access way, and transmits the encoded information to a relay station; II, the relay station receives and transmits the information in a full duplex way, performs interference cancellation on self-feedback interference, and forwards the information to a user B<J>; and III, the user B<J> performs corresponding decoding after a signal forwarded by the relay station is received in order to obtain the information transmitted by the user A<J>. The construction method is suitable for the field of communications.

Description

technical field [0001] The invention belongs to the communication field, and in particular relates to a construction method of a full-duplex relay system based on sparse code multiple access. Background technique [0002] In the existing communication system, regardless of the frequency division duplex mode or the time division duplex mode, the uplink and downlink communication are realized by occupying different resources to avoid interference between the uplink and downlink communications, which obviously wastes half of the wireless resources. How to use the same channel to realize simultaneous two-way transmission has become an important wireless spectrum resource that can be tapped in the subsequent evolution of 5G technology. [0003] In addition, the Orthogonal Frequency Division Multiplexing OFDM system widely used in 4G requires each user to be orthogonal to each other to avoid interference between users, but it cannot meet the requirements of 5G for spectrum efficie...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04L5/14H04B7/155H04B1/7103H04B1/7107
CPCH04B1/7103H04B1/7107H04B7/15557H04L5/001H04L5/14
Inventor 韩帅郭诚孟维晓吴少川张中兆
Owner HARBIN INST OF TECH
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