MIMO-SCMA system downlink design method based on STBC

A MIMO-SCMA and downlink technology, which is applied in the downlink design field of MIMO-SCMA system based on STBC, can solve the problems of SCMA technology bit error rate decrease and MIMO-OFDM technology is difficult to meet, and achieve bit error rate performance Enhanced effect

Active Publication Date: 2016-05-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that SCMA technology causes the drop in bit error rate and MIMO-OFDM ...

Method used

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  • MIMO-SCMA system downlink design method based on STBC
  • MIMO-SCMA system downlink design method based on STBC
  • MIMO-SCMA system downlink design method based on STBC

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specific Embodiment approach 1

[0019] Specific embodiment one: a kind of STBC-based MIMO-SCMA system downlink design method of this embodiment is specifically prepared according to the following steps:

[0020] Step 1, the structure of the MIMO-SCMA (multi-antenna sparse code multiple access) transmitter is as follows figure 1 As shown, the base station is used to receive the information sent by the uplink And carry out STBC encoding (space-time block coding) to the information that uplink sends according to coding matrix G namely Alamouti space-time block coding; Obtain the information T of the uplink reception after coding W and T' W ; Use the two antennas of the base station to transmit T W and T' W ; Wherein, J is the number of users; j is the serial number of the user; the subscript W is the length of the information sent by the user; Information of length W sent for the uplink of the jth user;

[0021] Step 2. Put T in the channel W and T' W Converted to S after fading and mutual superpositi...

specific Embodiment approach 2

[0030] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is: in step one X W i = [ x w 1 j x w 2 j ... x w K j ] T ,

[0031] in, The length of W and the subcarrier K occupied by the uplink transmission of the jth user are information; the subscript K is the subcarrier occupied by the information sent by the user. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0032] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one or two is that in step two, T W and T' W Converted to S after fading and mutual superposition W and S' W Specifically:

[0033] Received by the user terminal after fading and mutual superposition in the channel; the received signal is expressed as:

[0034] S W S W ′ = Σ j = 1 J H T W T W ′ ...

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Abstract

The invention provides an MIMO-SCMA system downlink design method based on STBC, and relates to the MIMO-SCMA system downlink design method. The MIMO-SCMA system downlink design method based on the STBC aims at the problems that error rate requires to be reduced by an SCMA technology and an MOMO-OFDM technology is difficult to meet the requirement of 5G for transmission rate. The method is realized by the steps that step one, two antennas of a base station are utilized to transmit TW and T'W; step two, user terminals are utilized to receive signals SW and S'W; step three, STBC decoding is performed on the signals SW and S'W received by each user terminal and then the decoded signals YW=[xw1xw2...xwK]T are obtained; step four, a factor graph is determined according to J users, occupation of K subcarriers, overload coefficient of J/K and a configuration matrix F; step five, the probability value of information transmitting of each user is obtained; and step six, information bits are obtained. The MIMO-SCMA system downlink design method based on the STBC is applied to the field of MIMO-SCMA system downlink design.

Description

technical field [0001] The invention relates to a downlink design method, in particular to a STBC-based MIMO-SCMA system downlink design method. Background technique [0002] Sparse code multiple access (SCMA) is a new type of non-orthogonal multiple access method. It is a high-speed transmission technology proposed by Huawei for high spectrum utilization efficiency. This air interface technology has been listed as a candidate for 5G mobile communication Compared with the traditional multiple access technology, it has the advantages of high capacity, small delay, fast transmission rate, strong anti-multipath ability, and overcomes the short-range effect of CDMA. Compared with OFDM, the spectrum efficiency of SCMA has been greatly improved, but due to the denser constellation points, the bit error rate has decreased to a certain extent. Moreover, it is difficult for the SCMA system to utilize airspace resources, thus limiting the improvement of system performance. [0003] ...

Claims

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Application Information

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IPC IPC(8): H04W52/14H04W72/12
CPCH04W52/143H04W72/52H04W72/23
Inventor 韩帅郭诚孟维晓沙学军张中兆
Owner HARBIN INST OF TECH
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