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Multicast transmission method for single-cell fixed relay based on orthogonal space-time coding

A technology of space-time coding and multicast transmission, which is applied in transmission systems, digital transmission systems, error prevention/detection using return channels, etc., and can solve problems such as time-consuming base stations, transmission signal interference, and waste of frequency resources

Inactive Publication Date: 2012-10-17
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0007] In short, in the existing multicast retransmission methods, the direct retransmission of the base station is time-consuming, laborious and has little effect.
When the relay uses different frequencies for retransmission, it is a waste of today's increasingly tight frequency resources
When the relay uses the same frequency for retransmission, there will be interference between the transmitted signals of different relays

Method used

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  • Multicast transmission method for single-cell fixed relay based on orthogonal space-time coding
  • Multicast transmission method for single-cell fixed relay based on orthogonal space-time coding
  • Multicast transmission method for single-cell fixed relay based on orthogonal space-time coding

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] see figure 1 Firstly, the application scenario of the method of the present invention is introduced: the cell is provided with three single-antenna fixed relays uniformly arranged at a distance of two-thirds of the cell radius from the base station, with an angle difference of 120° from each other, that is, the number of antennas is n=3. In the retransmission phase, all three relays participate in the retransmission, and each relay antenna serves as a space diversity factor in the orthogonal space-time coding matrix, so the orthogonal space-time coding is a three-column matrix. At the same time, set the data transmission rate of the system to Among them, m is the number of symbols contained in each data packet after the base station groups...

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Abstract

The invention discloses a multicast transmission method for a single-cell fixed relay based on orthogonal space-time coding. A cell base station groups data to be transmitted and broadcasts each data group to relays and users; the relays and the users respectively receive the data groups sent by the base station and decode the data groups; the users feed back confirmation information indicating whether each sign of the data groups is correctly received to the base station; the base station counts feedback information of the users and sends corresponding control signals to the relays according to the signs in the data groups which are not correctly received by the users; and the relays select a proper orthogonal space-time coding matrix for coding retransmission according to the control signals. The signals sent by the relays are orthogonal, so that even if the relays transmit resources with the same frequency, interference among the signals sent by different relays can be avoided; and therefore, the transmission performance of a system is greatly improved.

Description

technical field [0001] The present invention relates to a single-cell fixed relay multicast transmission method based on orthogonal space-time coding, which is used to solve the problem of mutual interference between different relay signals that use the same frequency resource to transmit signals in the process of data retransmission, and belongs to The technical field of wireless mobile communication. Background technique [0002] With the continuous advancement of the information age, the public's demand for communication applications such as voice, video, and web browsing is gradually increasing. This type of business is characterized by a large amount of information and high repetition. Now, the one-to-one unicast transmission mode can no longer meet the needs of users for these large data volume and real-time services. In order to solve this problem, people began to adopt multicast transmission. Multicast transmission is a technique in which a signal source simultane...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/16
Inventor 王晓湘龚文熔张海波唐名威王玉龙
Owner BEIJING UNIV OF POSTS & TELECOMM
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