Method for enhancing WiMAX ascending performance using collaboration diversity

A technology of cooperative diversity and performance, applied in diversity/multi-antenna systems, energy-saving ICT, climate sustainability, etc., to solve the problem of cooperative diversity and save costs and power consumption

Active Publication Date: 2009-04-22
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0003] In order to solve the problem of cooperative diversity under frequency selective fading channels, the present invention applies cooperative diversity to WiMAX system, combines cooperative diversity with OFDM, the key technology of WiMAX physical layer, and utilizes OFDM technology to resist frequency selective fading, while WiMAX utilizes cooperative diversity technology Improve overall system performance

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  • Method for enhancing WiMAX ascending performance using collaboration diversity
  • Method for enhancing WiMAX ascending performance using collaboration diversity
  • Method for enhancing WiMAX ascending performance using collaboration diversity

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Embodiment Construction

[0015] The method for enhancing WiMAX uplink performance in a WiMAX system by cooperative diversity is described below with reference to the drawings and specific implementation methods. Before the data enters the channel through RF up-conversion, the transmission process of each cooperative user in the WiMAX system at the transmitting end is divided into two stages, including cooperative decoding and retransmitting two symbol periods. In the first stage of cooperative decoding symbol period, the mutually cooperative user signals undergo serial-to-parallel transformation, Fourier transformation, and parallel-to-serial transformation, and then add a guard interval, and the users at the sending end send their own signals to the base station, and at the same time receive the signals sent by the cooperative users In the second stage, after the user receives the signal of the cooperative user, it detects and estimates it, uses QPSK modulation to modulate the transmitted signal, and ...

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Abstract

The invention relates to a method for strengthening WiMAX uplink performance by using cooperative diversity, relating to a wireless communication system. By using the technology of cooperative diversity, users in the WiMAX system share resources with each other to form a virtual MIMO (Multiple-Input Multiple-Output) system. Each of mutually cooperative users transmits the own signals to a base station, and simultaneously receives the signals transmitted by the cooperative users. After the user receives the signals of the cooperative users, the own signals and the received signals of the cooperative users are transmitted with an antenna by using different subcarriers. The cost of the system is saved and the power consumption of the system is reduced. By applying the cooperative diversity, the WiMAX system obtains obvious diversity gain, and the system performance is enhanced. In addition, the technology of cooperative diversity is combined with the key technology OFDM (Orthogonal Frequency Division Multiplexing) of WiMAX physical layer, thereby forming cooperative diversity mechanism of frequency selective fading channel and solving the cooperative diversity problem of frequency selective fading channel.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a WiMAX system. Background technique [0002] In wireless communication, the space diversity MIMO system can be realized by using multi-transmission and multi-reception antenna technology. Without increasing the system bandwidth and the total antenna transmission power, the system capacity can be increased several times or even dozens of times. The improvement is dramatic. However, in systems such as cellular mobile communications, terminal devices (such as mobile phones) are limited by factors such as volume, weight, power consumption, and cost, so it is difficult to implement multi-antenna technology. In order to achieve multi-antenna on the terminal, the idea of ​​cooperative diversity came into being. Its core idea is to realize virtual multi-transmission by cooperating among terminal users with only a single antenna and sharing their transmitting antennas in a certain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/02H04L27/26
CPCY02B60/50
Inventor 谢显中李皓
Owner CHONGQING UNIV OF POSTS & TELECOMM
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