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Communication method based on MIMO-OFDM and physical layer network coding

A technology of network coding and communication methods, applied in multi-frequency code systems, digital transmission systems, electrical components, etc., can solve problems such as unsatisfactory throughput, achieve the effect of improving network throughput and reducing bit error rate

Inactive Publication Date: 2015-08-12
PEOPLES LIBERATION ARMY ORDNANCE ENG COLLEGE
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Problems solved by technology

[0003] For the SISO (Single Input Single Output, SISO for short) system, its throughput still cannot meet the needs of modern wireless communication, and it has been theoretically proved that MIMO (Multiple Input Multiple Output, MIMO for short) Technology can greatly improve the performance and capacity of wireless communication systems

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  • Communication method based on MIMO-OFDM and physical layer network coding
  • Communication method based on MIMO-OFDM and physical layer network coding
  • Communication method based on MIMO-OFDM and physical layer network coding

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with accompanying drawing.

[0021] refer to figure 1 , the communication model of the embodiment is used to explain the principle of the physical layer network coding technology based on MIMO-OFDM, design the mapping rules of the physical layer network coding, and study the performance of the physical layer network coding under this technology. The specific steps of the communication method of the embodiment are as follows:

[0022] Step 1: Source node A and source node B respectively generate source signals in the first time slot. The source signals are converted into baseband signals through symbol mapping. IDFT is used to serially convert each baseband signal into N sub-signals, and N sub-signals are passed through OFDM. After modulation and STBC coder, it is transmitted by different antennas in turn. Both the source node A and the source node B have N antennas for transmitting signals.

[0023...

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Abstract

The invention relates to a communication method based on MIMO-OFDM and physical layer network coding, which belongs to the technical field of wireless communication. The communication method aims to further improve the performance of a wireless communication system, increase network throughput of a communication system, and reduce error rate of the communication system. The invention provides a communication method based on MIMO-OFDM and physical layer network coding. The communication method comprises OFDM modulation at the phase of multiple access and STBC coding; signal receiving and signal superposing at the relay node; superposing signal maximum likelihood decoding, physical layer network coding and STBC coding; broadcast signal receiving and opposite side information restoring. The communication method based on MIMO-OFDM and physical layer network coding is advantageous in that network throughput of the communication system is increased, and the error rate of the communication system is reduced; compared with the traditional physical layer network coding, the throughput of the communication method of the invention is 1.5 times that of the traditional physical layer network coding; when the error rate BER is 10-5, the coding gain of the communication method of the invention is approximately 0.8dB.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a communication method based on MIMO-OFDM and physical layer network coding. Background technique [0002] In a wireless communication system, there are multiple wireless propagation paths with different time delays between the transmitter and the receiver, causing multipath effects. When the maximum multipath delay is greater than the code word duration, it will cause frequency selective fading. The multipath diffusion of the signal causes intersymbol interference (Inter Symbol Interference, ISI for short), and leads to an increase in the bit error rate during transmission. Orthogonal Frequency Division Multiplexing (OFDM) technology can convert high-speed serial data into multiple parallel low-speed data, and modulate to relatively independent orthogonal subcarriers Transmission over the wireless channel reduces the impact of time dispersion caused by multipath...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L27/26
Inventor 胡永江王永川王长龙袁全盛杨志民
Owner PEOPLES LIBERATION ARMY ORDNANCE ENG COLLEGE
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