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Code word selecting method on basis of two-jump distributed precoding limited feedback

A precoding and distributed technology, applied in digital transmission systems, baseband system components, and error prevention/detection through diversity reception, which can solve the problem of high complexity of codeword selection

Inactive Publication Date: 2013-03-06
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, the existing distributed codeword selection still has the problem of high codeword selection complexity. How to use the lower computational complexity to select the most suitable codebook can reduce the feedback delay, which has a very important reality. significance

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  • Code word selecting method on basis of two-jump distributed precoding limited feedback
  • Code word selecting method on basis of two-jump distributed precoding limited feedback
  • Code word selecting method on basis of two-jump distributed precoding limited feedback

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Embodiment Construction

[0038] like figure 1 As shown, the structure of the communication system of the present invention includes a transmitter, a multi-antenna unidirectional relay and a receiver. The number of antennas at the transmitter, relay and receiver is N respectively s , N r , N u , and transmit K=1 data stream at the same time. The relay end is a half-duplex amplifying and forwarding relay.

[0039] The embodiment of the present invention discloses a two-hop relay distributed precoding code word selection method, and a complete communication process is completed within two hops. At the first hop, the sender sends a signal to the relay through the sender's precoding matrix; at the second hop, the relay transmits information to the receiver through the relay's precoding matrix. like figure 2 As shown, the specific steps of the method are as follows:

[0040] Step 1: The sender sends a pilot signal to the relay, and the relay performs channel estimation on the pilot signal to obtain ...

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Abstract

The invention relates to a code word selecting method on the basis of two-jump distributed precoding limited feedback. The integral transmission process is completed in two jumps. In the first jump, firstly, a relay estimates channel response from each antenna to the relay on each subcarrier; secondly, after being processed, a transmitting end signal is sent to the relay by a transmitting end precoding matrix, the relay obtains a transmitting end CSI (Customer Satisfaction Index), carrying out SVD (Singular Value Decomposition) on a channel matrix, using direction information of a right singular vector as a feedback quantity and quantizing the feedback quantity by utilizing a RVQ (Random Vector Quantization) code generated below the line; and finally, using a code word vector with the smallest included angle with the feedback quantity and the maximum inner product as a quantization quantity by utilizing a minimum distance criterion, converting a number of the selected code word vector into a binary code and feeding back the binary code to a transmitting end. The transmitting end regulates a sending strategy according to the code word vector which is fed back so as to adapt to the channel state. According to the invention, the code word selecting time can be obviously reduced; the complexity of code word selection and computing is reduced; and the sum rate performance of a system is also obviously improved.

Description

【Technical field】 [0001] The invention belongs to the field of wireless communication, and in particular relates to a codeword selection method based on two-hop distributed precoding limited feedback. 【Background technique】 [0002] Cooperative communication means that in a multi-user communication environment, adjacent nodes share each other's antennas in a certain way for cooperative transmission, thereby creating a virtual environment similar to multi-antenna transmission, obtaining space diversity gain, and improving system transmission performance. way of communication. [0003] The relay station for communication is introduced into the cooperative communication network, and the relay station can be used as a dedicated signal forwarding node, which can receive the control signal of the base station and the feedback information of the mobile station at the same time. Compared with ordinary mobile terminals, it has the characteristics of enduring high power consumption. ...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/06H04L1/16H04L25/02
Inventor 赵睿郭荣新李笑笑袁继昌
Owner HUAQIAO UNIVERSITY