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A method for finding optimal pilot length and power division factor in a point-to-point misoswipt system

A point-to-point, optimal technology, applied in the field of communication systems, can solve problems such as low efficiency

Active Publication Date: 2021-02-05
SHANDONG UNIV
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  • Description
  • Claims
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Problems solved by technology

For the simultaneous transmission of wireless information and energy in a multi-antenna system, the existing technology uses low-efficiency omnidirectional beamforming for energy transmission

Method used

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  • A method for finding optimal pilot length and power division factor in a point-to-point misoswipt system
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  • A method for finding optimal pilot length and power division factor in a point-to-point misoswipt system

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Embodiment

[0081] A method for finding optimal pilot length and power division factor in a point-to-point MISOSWIPT system, such as figure 1 As shown, the transmitter is equipped with N t Antenna, N t =128, the transmitting power P of the transmitting end is 25dBm, and the receiving end is the MISO system of a single-antenna user; d -5dBm; another part is used for energy harvesting. A system in coherence time such as figure 2 As shown; the coherence time T is divided into two time slots, including the first time slot τT and the second time slot (1-τ)T, τ is the proportion of the pilot length in the coherence time; T is set as 100, including: transmit power P of unit length pilot p 5dBm,

[0082] (1) Uplink channel estimation is performed in the first time slot τT, that is, the receiving end sends a pilot training sequence, and the sending end performs channel estimation based on the minimum mean square error MMSE; including:

[0083] A. The receiving end sends a pilot training seq...

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Abstract

The invention relates to a method for finding optimal pilot length and power division factor in a point-to-point MISO SWIPT system, which includes: (1) performing uplink channel estimation in the first time slot τT, that is: the receiving end sends a pilot training sequence, The transmitter performs channel estimation based on minimum mean square error MMSE; (2) The second time slot (1-τ)T performs downlink information and energy transmission; (3) Channel estimation error analysis; (4) Problem modeling and Analysis; (5) Search for optimal pilot length and power division factor. The present invention analyzes the joint optimization of the length of the channel estimation pilot sequence and the power distribution factor of the receiving end, thereby obtaining the optimal pilot length and corresponding power distribution factor that maximize the system's achievable rate.

Description

technical field [0001] The invention belongs to the field of communication systems, and in particular relates to a method for finding optimal pilot length and power division factor in a point-to-point MISOSWIPT system. Background technique [0002] Traditional wireless devices are generally powered by batteries or cables. Due to the limited life of batteries, they need to be replaced or recharged manually, resulting in interruption of communication, which affects the development of modern communication technology. [0003] Wireless energy transmission is a good solution. It uses radio frequency signals to transmit energy, and wireless devices can use the harvested energy for information demodulation and transmission. [0004] At present, wireless energy transmission technology is divided into two categories: near-field and far-field. The former mainly uses inductive coupling and resonant coupling effects. Since the coupling effect is greatly affected by distance, it can only...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0426H04B7/06H04B7/08H04B5/00H04L25/02
CPCH04B7/0426H04B7/043H04B7/0617H04B7/08H04L25/0224H04L25/0226H04L25/0256H04B5/79
Inventor 张海霞王莹
Owner SHANDONG UNIV
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