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Optimization method of multi-antenna decoding and forwarding relay transceiver under non-ideal csi

A technology for decoding and forwarding and optimization methods, applied in radio transmission systems, electrical components, transmission systems, etc., can solve the problems of reduced capacity gain, difficulty in obtaining channel state information, incomplete channel state information, etc., and achieves low computational complexity, The effect of improving the reachable information rate and facilitating the realization of the project

Active Publication Date: 2020-11-03
SOUTHEAST UNIV
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Problems solved by technology

[0004] In actual multi-antenna communication systems, it is often difficult to obtain accurate channel state information. If the channel state information is incomplete, the capacity gain will be reduced
Therefore, the performance of beamforming design based on ideal CSI will be severely degraded

Method used

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  • Optimization method of multi-antenna decoding and forwarding relay transceiver under non-ideal csi
  • Optimization method of multi-antenna decoding and forwarding relay transceiver under non-ideal csi
  • Optimization method of multi-antenna decoding and forwarding relay transceiver under non-ideal csi

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Embodiment Construction

[0034] The present invention will be described in detail below through a preferred embodiment and in conjunction with the accompanying drawings.

[0035] A typical application scenario of the present invention is a half-duplex decoding and forwarding multi-antenna relay system with non-ideal channel state information, by transmitting the beamforming vector w to the source S , relay receiving beamforming vector g R,S and the transmit beamforming vector w R Joint optimization is performed to maximize the achievable information rate of the system under the premise of satisfying the system transmit power constraints. Such as figure 1 As shown, in a non-ideal CSI multi-antenna decoding and forwarding relay transceiver optimization method disclosed in the embodiment of the present invention, the constructed optimization problem can be expressed as:

[0036] The optimization goal is: to maximize

[0037] The constraints are: ‖w S ‖ 2 ≤P s ,‖w R ‖ 2 ≤P r

[0038] Among ...

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Abstract

The invention discloses a method for optimizing a multi-antenna decoding and forwarding relay transceiver under non-ideal CSI. By constructing an optimization problem using limited system transmittingpower as the constraint and using the maximization of a system end-to-end information transmission rate as the target in the case of the non-ideal CSI, the joint optimization of a signal source transmitting beam forming vector, a relay receiving beam forming vector and a relay transmitting beam forming vector is achieved. The optimization process is as follows: firstly, the transmitting beam forming vector of a relay terminal is optimized, then the relay receiving beam forming vector is fixed, the signal source transmitting beam forming vector is optimized, then the signal source transmittingbeam forming vector is fixed, the relay receiving beam forming vector is optimized, and the step of alternatively optimizing the relay receiving beam forming vector and the signal source transmittingbeam forming vector is repeated until a reachable information transmission rate of the system converges. Compared with a transmission scheme that does not consider the non-ideal CSI, the method disclosed by the invention has the advantages that the system transmission rate can be effectively improved, the computational complexity is relatively low, and it is advantageous for engineering implementation.

Description

technical field [0001] The invention relates to a relay communication system, in particular to an optimization method for multi-antenna decoding and forwarding relay transceivers under non-ideal CSI. Background technique [0002] The working modes of common multi-antenna relays are mainly amplification and forwarding and decoding and forwarding. The relay in the amplification and forwarding mode will directly provide gain to the signal received from the source and send it to the next hop, while the relay in the decoding and forwarding mode When a signal transmitted by the source is received, it is decoded, re-encoded and transmitted to the destination. This method can reduce the impact of noise on system performance, and the performance is better than that of the amplification and forwarding mode. [0003] The relay system can also be divided into two working modes, half-duplex and full-duplex. The full-duplex mode can save resources very well, but it requires the relay nod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/155
CPCH04B7/15528
Inventor 沈弘秦宇静许威赵春明
Owner SOUTHEAST UNIV
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