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Bit allocation and power control method for two-way relay system based on OFDM

A two-way relay, system bit technology, used in power management, transmission systems, payload distribution, etc.

Active Publication Date: 2017-07-07
NANTONG UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the combination of the two is seldom considered from the perspective of green energy saving

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  • Bit allocation and power control method for two-way relay system based on OFDM
  • Bit allocation and power control method for two-way relay system based on OFDM
  • Bit allocation and power control method for two-way relay system based on OFDM

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Embodiment Construction

[0067] Such as figure 1 As shown, the source node N A and N B To complete an information exchange, two consecutive time slots of equal length need to be occupied. At the beginning of the first time slot, N A and N B set array And let L=K, where K is the total number of subcarriers, and then according to the target rate, according to the above-mentioned three-step algorithm, distribute θ bits to K subcarriers, and then calculate the respective transmit power. Next, the source node N A and N B Then send the respective information to the relay node N at the same time R .

[0068] In the second time slot, the relay node N R It is necessary to scale the received signal (the inherent operation process of the AF protocol), and then calculate its own transmission power according to formula (14), and then broadcast it to the source node N A and N B . In order to complete the above operations, the relay node N R The number of bits allocated per subcarrier needs to be know...

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Abstract

The invention discloses a bit allocation and power control implementation method for an OFDM two-way relay system. The method comprises the following steps: by taking the minimization of the system transmitting power as the goal and taking the target rate of a source node as a limiting condition, simultaneously carrying out sub-carrier bit allocation and node transmitting power adjustment according to the channel state information. Thereby, the minimization of the total transmitting power of the system can be achieved on the basis of meeting the target rate of the source node.

Description

technical field [0001] The invention relates to a joint implementation method of subcarrier bit allocation and node transmission power control of an AF (Amplify-and-Forward) two-way relay communication system based on OFDM (Orthogonal Frequency Division Multiplexing) modulation, and belongs to the technical field of wireless communication. Background technique [0002] At the beginning of this century, researchers proposed a cooperative diversity (relay) technology to solve the problem that small mobile terminals cannot be equipped with multiple antennas. Different from traditional point-to-point communication, cooperative diversity technology allows different user nodes in a wireless network to share each other's antennas and other network resources, which is expected to greatly increase the capacity and multiplexing gain of wireless networks. At the same time, it also has great development potential in anti-channel fading, covering shadow areas, expanding the effective cov...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04W52/34H04W52/46
CPCH04L5/0008H04L5/0044H04W52/346H04W52/46
Inventor 吉晓东
Owner NANTONG UNIVERSITY
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