Method for self-adaption selection of relay strategy for multi-relay collaboration communication

Abstract

A self-adapting method which is used for a relay strategy of a multiple-relay cooperative communication respectively selects an appropriate retransmission mode and distributes a corresponding transmission power for each relay code according to the state of current real-time channel. Or a direct transmission mode is decided to be selected in order to realize the maximization of the channel capacity of the system and provide a high-efficiency communication under the state of reliability. The method mainly comprises the following operation procedures: (1) estimating the channel, (2) selecting a cooperative partner, (3) choosing an optimum relay strategy for each rely with the result of channel estimation and partner selection, (4) respectively calculating the capacity of the direct transmission channel and the capacity of the channel of the selected relay plan according to the formula of channel capacity, and (5) taking the plan with larger capacity of the equivalent channel as a final selection result. The method determines whether the relay is used according to the current channel state, and selects an optimum retransmission strategy for each relay under the precondition that the reliability and availability of the communication are considered and reasonably distribute power between the signal source and each relay.

Description

Adaptive selection method of relay strategy for multi-relay cooperative communication technical field The present invention relates to a method for implementing cooperative transmission in a wireless communication network, to be precise, to a method for adaptively selecting a relay strategy for multi-relay cooperative communication, and belongs to the technical field of cooperative communication in wireless communication . Background technique Cooperative Communication (Cooperative Communication) is also called cooperative communication. Virtual MIMO technology is a subset of it. In a cooperative communication system, each mobile terminal has one or more partners (Partners), or called relays (Relays). While partners transmit their own information, they also assist their partners in transmitting information. In this way, in the process of transmitting information, each terminal simultaneously utilizes its own space channel and its partner's space channel, thereby obtaini...

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Problems solved by technology

The disadvantage of this prior art is that in a multi-relay system, the channel conditions experienced by different relays may vary greatly, and the optimal relay methods may also be different. If all relays use The same relay mode is bound to limit the performance of the system

However, in a wireless network, some users often have multiple idle users who are suitable as their relays at the same time, which will also restrict the improvement of their transmission performance.

The introduction of relay can bring space diversity gain to the communication link, but it will inevitably cause some additional overhead. In some cases, these overheads will even offset the cooperation gain, which means that it is not suitable for all situations. Adopting collaborative communications, for which various choices must be made

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