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Physical layer network coding method for bidirectional relay channel of cellular system

A two-way relay and network coding technology, applied in diversity/multi-antenna systems, space transmit diversity, etc.

Inactive Publication Date: 2011-11-09
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the two-way relay network coding scheme in TDMA mode needs to allocate a time slot to each user, and still needs multiple time slots to complete the uplink and downlink communication
In the prior art, there is no better solution to the problem of how to perform two-way relay network coding and improve the traversal capacity or sum rate of the network when the user terminal is equipped with multiple antennas.

Method used

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  • Physical layer network coding method for bidirectional relay channel of cellular system
  • Physical layer network coding method for bidirectional relay channel of cellular system
  • Physical layer network coding method for bidirectional relay channel of cellular system

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Embodiment 1

[0048] In this embodiment, the base station BS and the relay Re are each equipped with n T antenna, the mth user Um is equipped with Antennas, m=1,...,M, Ensure that the designed precoding matrix is ​​of full rank, transmit data in half-duplex mode, and all links and noises obey the complex Gaussian distribution with mean value 0 and variance 1. Two-way relay communication is divided into the following two processes: Process 1, the base station BS and M users simultaneously send information to the relay Re; process 2, the relay Re broadcasts and forwards information to the base station BS and M users.

[0049] figure 1 A schematic diagram of the two-way relay channel communication model of the cellular system adopted in this embodiment is given. The specific process is as follows:

[0050] In the first time slot, the base station BS sends the precoded symbols Ps, where s = s ...

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Abstract

The invention discloses a physical layer network coding and design method for a bidirectional relay channel of a cellular system, which is characterized by comprising the steps as follows: a base station precodes sent signals and then sends to a relay node, and at the same time, users also respectively send respective information to a relay end; the relay node receives the information sent by the base station and users and performs physical layer network coding hybrid, the signals subjected to physical layer network coding are precoded so as to ensure that the signals received by one user can not be disturbed by other users, and the signals are forwarded; and the users and base station respectively receive the signals forwarded by the relay node, and disturbing signals in respective received signals are respectively eliminated so as to perform demodulation. Compared with the existing technical method of time division multiplexing bidirectional relay physical layer network coding, the invention greatly reduces the time slot required for completing uplink / downlink communication transmission, supports the communication of more users and improves the outage probability of each user and the ergodic capacity of the overall system.

Description

technical field [0001] The invention belongs to the technical field of cooperative communication in wireless communication, and in particular relates to a physical layer network coding method suitable for a bidirectional relay channel of a cellular system. Background technique [0002] Laying relay nodes and adopting advanced relay schemes in traditional communication systems can not only effectively improve the coverage and reliability of communication networks, but also avoid the problem of reducing the size of cells caused by using high-frequency bands to increase transmission rates. [0003] Two-way relay communication is one of the hot spots in the research of multi-point cooperative communication. A two-way relay network coding scheme proposed by IEEE Transactions on Wireless Communications, vol.9, No.2: 764-777, 2010, adopts 2 source nodes through the relay Nodes exchange information with each other, and relay nodes use network coding technology to process two-way ac...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/08
Inventor 淦明李辉
Owner UNIV OF SCI & TECH OF CHINA
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