Distributed Alamouti coding cooperative transmission method based on quasi-orthogonal channel allocation

Abstract

The invention discloses a distributed Alamouti coding cooperative transmission method based on quasi-orthogonal channel allocation, which mainly solves the problem that the traditional method can not simultaneously take the reliability and effectiveness of a system into consideration. In the implementation process of the method, a relay cooperative communication system is set; in a first time slot and a second time slot, a sender S respectively broadcasts signals x1 and x2, and relays R1 and R2 respectively receive signals yr11k, yr21 and yr12, yr22,; in a third time slot, the relays R1 and R2 respectively transmit signals ayr11 and -ay<*>r22 to a receiver D on the same channel, wherein a is an amplification factor, and ()* is complex conjugate; the sender S transmits a signal -x<*>2 to the receiver D on the orthogonal channel with the R1 and the R2; and in a fourth time slot, the relays R1 and R2 respectively transmit signals ayr12 and ay<*>r21 to the receiver D on the same channel, the sender S transmits a signal x<*>1 to the receiver D on the orthogonal channel with the R1 and the R2, and the receiver D carries out maximal likelihood decoding on the received signals. The invention can ensure that the system achieves performance compromising between false symbol rate and spectral efficiency and simultaneously takes the reliability and the effectiveness of the communication system into consideration.

Description

Technical field [0001] The invention belongs to the field of virtual MIMO wireless communication networks, and relates to space-time coding technology, especially for a wireless communication network with one sender, two relays and one receiver, a distributed Alamouti based on quasi-orthogonal channel allocation is designed. The coding cooperative transmission method achieves a compromise between the symbol error rate and the spectrum efficiency performance of the wireless communication system, thereby simultaneously taking into account the reliability and effective transmission of the communication system. Background technique [0002] In wireless communication systems, spatial diversity technology is an effective method to resist multipath fading, which can be achieved by configuring multiple antennas at the transmitter and receiver. Such a system is called a multiple-input multiple-output MIMO system. However, in practical applications, due to the size and power consumption li...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcoming that prior art can not take into account both in symbol error rate and spectral efficiency, proposes a kind of distributed Alamouti coding cooperative transmission method based on quasi-orthogonal channel assignment, in order to be in symbol error rate and spectral efficiency Spectrum efficiency achieves a performance compromise between the two, while taking into account the reliability and effectiveness of the communication system

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