Orthogonal space-time block code transmission method based on an optimal relay linear weighting matrix

Abstract

The invention discloses an orthogonal space-time block code transmission method based on an optimal relay linear weighting matrix, which solves the problems of high error rate and poor transmission performance in the traditional method. The orthogonal space-time block code transmission method is realized by the following steps: (1) a communication system formed by a source node S, a relay node R and a destination node D is set; (2) at a first time slot, the source node S sends signal vectors x1 and x2, and the relay node R receives data yr1 and yr2; (3) the relay node R carries out singular value decomposition on a channel matrix H1 from the source node S to the relay node R and a channel matrix h2 from the relay node R to the destination node D; (4) the relay node R constructs an optimal linear weighting matrix W; (5) at a second time slot, the relay node R constructs and sends signal vectors xr1 and xr2 to the destination node D; and (6) the destination node D receives data yd1 and yd2 and constructs a judgment vector to decode. The orthogonal space-time block code transmission method disclosed by the invention has the advantages that: since the signal-to-noise ratio of received signals is increased, the system error rate is reduced, and the system transmission performance is improved.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to signal transmission in a relay cooperative communication system, in particular to an orthogonal space-time block coding transmission method based on an optimal relay linear weighting matrix, which can be used in a multi-antenna relay system. Background technique [0002] In wireless communication systems, multiple-input multiple-output MIMO antenna configurations can greatly improve the reachable capacity of traditional single-input single-output SISO systems, and can provide gains such as diversity and multiplexing. For example, in a MIMO system, spatial multiplexing gain can be obtained by adopting a vertical layered space-time coding transmission method, and diversity gain can be obtained by adopting an orthogonal space-time block coding transmission method. [0003] However, in practical applications, on the one hand, the MIMO system cannot be realized due to the size and...

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Problems solved by technology

However, the above two methods do not make full use of the linear processing capability and multi-antenna diversity gain of the relay, so it will cause the reduction of the system receiving signal-to-noise ratio and the performance of the bit error rate, thereby reducing the transmission performance of the system

Moreover, when the CSI information between the source node and the relay and the relay and the destination node are known, the optimal linear weighting matrix at the relay is unknown, so the current non-regenerative relay-assisted orthogonal space-time The block coding transmission method cannot optimally process the information at the relay, so that the bit error rate performance of the system is very low, and the transmission performance of the system is limited

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