MIMO (Multiple Input Multiple Output) relay selection method on basis of MMSE (Minimum Mean Square Error)

Abstract

The invention discloses a MIMO (Multiple Input Multiple Output) relay selection method on the basis of a MMSE (Minimum Mean Square Error), which comprises the following steps that in the step 1, an information sink D selects the optimal relay and a corresponding relay processing matrix by an iterative algorithm according to all known channel matrices, i.e. a forward channel and a backward channel are subjected to singular value decomposition (SVD) to obtain a corresponding characteristic mode of each channel matrix, a mean square error (MSE) detected by a signal at the position of the information sink is calculated by using all the channel characteristic modes as equivalent channel parameters, obtaining the channel characteristic mode which meets the MMSE by an iterative greedy algorithm, and then notifying information to each node in a communication network; in the step 2, a signal source S sends a signal sequence, the relay selected in the step 1 receives the signal sequence, and the received signal is processed according to the processing matrix returned by the information sink in the step 1 and then is forwarded to the information sink D; and in the step 3, the information sink D decodes by a Wiener filter. An experimental result shows that the bit error performance of the scheme disclosed by the invention is superior to the existing scheme.

Description

Technical field [0001] The invention involves the field of wireless communication, which is based on MMSE (MINIMUM Mean Squared Error, minimal average error) MIMO (Multiple-Input Multiple-Put, more in). Background technique [0002] With the continuous development of communication technology, people have higher and higher performance requirements for transmission rates, transmission reliability, resource utilization, and communication security.In the wireless network communication, relay collaboration is one of the important means to counter multi -diameter decline and improve the quality of communication.In the relay network, Xinyuan sends a message to the residence, and the relay node also receives the message at the same time, and forwards it to the residence (or repost after being processed).Then use all the messages to decod in all the received messages.Under such a transmission model, the relay nodes play a certain role in assisting the communication between the source-resi...

AI Technical Summary

Problems solved by technology

However, in this paper, the relay node can only work with a pair of antennas, that is, single-antenna selection, which is not a real MIMO relay selection.

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