Method for searching optimal pilot length and power division factor in point-to-point MISO SWIPT system

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

Active Publication Date: 2018-09-04
SHANDONG UNIV
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Problems solved by technology

For the simultaneous transmission of wireless information and energy in a multi-antenna syst...

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  • Method for searching optimal pilot length and power division factor in point-to-point MISO SWIPT system
  • Method for searching optimal pilot length and power division factor in point-to-point MISO SWIPT system
  • Method for searching optimal pilot length and power division factor in point-to-point MISO SWIPT system

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Embodiment

[0083] A method for finding optimal pilot length and power division factor in a point-to-point MISO SWIPT 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 a MISO system for single-antenna users; 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,

[0084] (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:

[0085] A. The receiving end sends a pilot training sequ...

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Abstract

The invention relates to a method for searching an optimal pilot length and a power division factor in a point-to-point MISO SWIPT system, comprising the following steps of: (1) performing uplink channel estimation by a first time slot TauT, namely sending a pilot training sequence by a receiving end, and performing channel estimation based on the minimum mean square error MMSE by a sending end; (2) performing downlink information and energy transmission by a second time slot (1-Tau)T; (3) analyzing channel estimation errors; (4) modeling and analyzing problems; and (5) searching the optimal pilot length and power division factor. The invention analyzes the joint optimization between the length of the pilot sequence performing the channel estimation and the power division factor of the receiving end, thereby obtaining the optimal pilot length enabling the system to reach the maximum rate, and corresponding power division factor.

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 MISO SWIPT 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 onl...

Claims

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Application Information

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IPC IPC(8): H04B7/0426H04B7/06H04B7/08H04B5/00H04L25/02
CPCH04B5/0037H04B7/0426H04B7/043H04B7/0617H04B7/08H04L25/0224H04L25/0226H04L25/0256
Inventor 张海霞王莹
Owner SHANDONG UNIV
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