Multi-antenna relay transmission method based on singular value decomposition close-to zero beam forming

Abstract

The invention discloses a multi-antenna relay transmission method of decomposing zero-forcing beam-forming based on singular value, which is characterized in that the relay station only makes use of the channel state information from the relay station to the user, and selects the transmission user congregation according to the semi-orthogonal user selection algorithm; the base station and the relay station jointly design the linear pre-processing matrix according to the singular value decomposition of the channel matrix from the base station to the relay station and the zero-forcing beam-forming matrix from the relay station to the user channel matrix; the base station allocates the power by using the power injection algorithm according to the channel state information from the base station to the relay station, and the relay station splits the power in accordance with the sub-flow number of the allocated power from the base station, so as to determine signals for the base station to send and signals for the relay station to transmit; and the transmission method system has advantages of small feedback amount, low complexity, effective control of noise amplification from the relay station, representing asymptotic optimal functions under the conditions that the power of the relay station is very large and that the number of system users are very large, and being suitable to be used in actual systems.

Description

technical field [0001] The invention belongs to the multi-antenna technical field of wireless communication, and in particular relates to a transmission method of a multi-user multi-antenna relay broadcast channel. Background technique [0002] "International Institute of Electronics and Electrical Engineers Signal Processing Journal" (IEEE Transactions on Signal Processing, vol.56, issue 2, February 2008, pp.727-738) proposed a multi-user multi-antenna relay broadcast channel based on singular value decomposition The signal processing strategy of zero-forcing dirty paper coding and the corresponding user selection and power allocation strategies ensure the system throughput performance of the multi-user multi-antenna relay broadcast channel. However, due to the use of dirty paper coding and the need for two-step power injection for power allocation, this transmission method is very complex; since all channel state information is required for user selection, relay stations a...

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Problems solved by technology

However, due to the use of dirty paper coding and the need for two-step power injection for power allocation, this transmission method is very complex; since all channel state information is required for user selection, relay stations and users must perform complex channel state information feedback, the system The amount of feedback is large; at the same time, due to the noise amplification problem at the relay end, this method makes its performance unable to reach the upper limit of capacity. In actual systems, this is not a practical method

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