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Feedback-free interference cancellation method in mimo interference channel

A technology of interference channel and interference elimination, which is applied in the field of communication and can solve the problem of high feedback

Inactive Publication Date: 2017-11-03
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of high feedback in existing schemes, the present invention proposes an interference elimination method without feedback in MIMO interference channels, which is suitable for interference channels with three transmitting ends and three receiving ends, and each sending end is configured with 4 antennas per Each receiver is equipped with 2 antennas

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  • Feedback-free interference cancellation method in mimo interference channel
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Embodiment Construction

[0064] An embodiment of the present invention is given below to further describe the present invention in detail. System model such as figure 1 shown. The system consists of three senders and three receivers R i , i=1,2,3, each transmitting end is configured with 4 antennas, and each receiving end is configured with 2 antennas. h ik is the channel matrix from the kth sending end to the ith receiving end, their order is 2×4, i=1,2,3, k=1,2,3.

[0065] A i and B i is the expected received codeword of the i-th receiver, i=1,2,3, A i and B i The expression form is as follows,

[0066]

[0067] Among them, a m =c 2m-1 +e jθ c 2m , b m =s 2m-1 +e jθ the s 2m , m=1,2,L,6,c k and s k is the modulation signal, k=1,2,L,12, the value of θ makes a m and b m non-zero, (·) * Indicates conjugation. if a m and b m As a modulation symbol, m=1,2,L,6, then A i and B i All have the structure of the Alamouti code word, i=1,2,3.

[0068] The three senders respectivel...

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Abstract

The invention discloses an interference elimination method without feedback in a MIMO interference channel, which is suitable for interference channels of three transmitting ends and three receiving ends, and each sending end is configured with 4 antennas and each receiving end is configured with 2 antennas. A space-time codeword with Alamouti structure is designed for each sender, and then the codewords are linearly combined and a zero matrix is ​​introduced. The introduction of the zero matrix eliminates the multi-user interference at the third receiving end; then, by performing a linear operation on the received signal, the number of mutually interfering codewords at the first two receiving ends is reduced; finally, using the equivalent of the Alamouti codeword The orthogonal nature of the channel matrix eliminates multi-user interference.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for eliminating multi-user interference in a MIMO interference channel. Background technique [0002] Multiple-Input Multiple-Output (MIMO, Multi-Input Multi-Output) technology uses multiple transmitting antennas and multiple receiving antennas at the transmitting end and receiving end respectively, which can significantly improve system performance. [0003] Divided from the number of users supported by the system, MIMO technology is divided into single-user MIMO technology and multi-user MIMO technology. In multi-user MIMO, multiple transmitters simultaneously send signals to multiple receivers. Due to the broadcast characteristics of the wireless channel, there is multi-user interference at the receiving end, which seriously affects the performance of the system. The most studied interference removal method is interference alignment. Interference alignment is to align the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/08H04L1/06H04B7/0456
Inventor 田心记赵鸿图李亚贾利琴雒芬杨冬
Owner HENAN POLYTECHNIC UNIV