Multi-user wireless communication system based on both-way trunk and method thereof

Abstract

The invention discloses a multi-user wireless communication system based on both-way trunk and a method thereof; the communication system comprises four multi-antenna transceivers (not only a transmitter but also a receiver) and a multi-antenna both-way trunk; each transceiver is composed of an orthogonal frequency division multiplexing (OFDM) modulator, an OFDM demodulator, a memory and a self-interference eliminator; the both-way trunk is composed of an OFDM modulator, an OFDM demodulator and a beam former and is a semi-duplex amplifying transmission relay. The communication method leads a complete communication process to be finished within two time slots; in the first time slot, the four transceivers send signals to the relay at the same time, and an orthogonal frequency division multiple access is adopted as a multiple access way; in the second time slot, the relay adopts orthogonal frequency division multiplexing / space division multiplexing multiple access (OFDM / SDMA) as a multiple access way for leading received signals after being processed to be broadcasted to the four transceivers. In the invention, two multiple access ways are integrated, and relay beam forming matrixes suitable for different requirements of relay antenna number are respectively designed by adopting the two methods, thereby effectively utilizing space diversity to eliminate interference among the transceivers, and compared with the existing relay communication technology, the higher system and speed are realized.

Description

technical field [0001] The invention relates to a multi-user wireless communication system, in particular to a multi-user wireless communication method based on two-way relay, which belongs to the field of wireless communication. Background technique [0002] Research shows that the relay-based wireless communication network structure can effectively reduce the waste of power resources caused by path loss, improve spectrum utilization, and use the multi-hop connection idea of ​​self-organizing ad hoc network to improve the invulnerability of the network. Therefore, the relay-based network structure and cooperative multiplexing technology have received extensive research and attention, and the issue of how to introduce relay cooperative processing has been considered in the formulation of new generation mobile communication, wireless local area network and broadband wireless network standards. By utilizing network coding, bidirectional relay protocols can achieve higher spect...

AI Technical Summary

Problems solved by technology

However, the multi-user system with OFDMA addressing has the disadvantage of low spectrum utilization. SDMA technology uses the difference of spatial channels to share the same time-frequency resource, which can improve the spectrum efficiency of the system in a limited frequency band.

At present, the design methods for two-way relay processing matrix include singular value decomposition, zero-forcing reception and transmission, and minimum mean square error reception and transmission, etc., but there is no design method for multi-user communication

Images