A qos-based power allocation method for visible light communication non-orthogonal multiple access systems
A technology of non-orthogonal multiple access and visible light communication, which is applied in the field of power distribution of non-orthogonal multiple access system of visible light communication based on QoS, to achieve the effect of reducing power consumption, facilitating implementation, and reducing computational complexity
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0032] Such as figure 1 As shown, the present invention introduces NOMA technology into the downlink of the visible light communication system based on the power allocation of the QoS non-orthogonal multiple access system of the visible light communication system. In order to ensure the effectiveness of receiver interference cancellation, the NOMA system requires users with good channels Allocate low power, and allocate high power to users with poor channels, and establish the following optimization problem based on quality of service (QoS):
[0033] The present invention provides a QoS-based non-orthogonal multiple access system power allocation method for visible light communication, and the transmission rates of N users are expressed as The minimum total power consumed by N users is expressed as:
[0034]
[0035] Among them, N is the total number of users, P k is the power allocated to the kth user and is the variable to be optimized, the P k The following constrain...
Embodiment 2
[0049] Such as figure 2As shown, the communication model targeted by the present invention is the downlink of the visible light communication system, that is, there is a light-emitting diode (LED) on the ceiling as the transmitting end, and N users are randomly distributed below, and the LED obeys the near-Lambert radiation model. The transmission information of satisfies the uniform distribution of [-1,1]. Some studies have shown that the line-of-sight signal energy of the VLC system is much greater than the reflected signal. When considering the channel model, only the line-of-sight information can be considered. The DC channel gain of the kth user is the channel response h k Determined by:
[0050]
[0051] Among them, m is the Lambertian order, θ 1 / 2 is LED half angle, d k for the kth user with
[0052] Direct reach distance of LED, φ k is the angle of incidence, Is the radiation angle, A is the receiving area of the photodiode (PD), R P is the responsivity...
Embodiment 3
[0056] Such as image 3 As shown, the principle of the non-orthogonal multiple access technology described in the present invention is to transmit the signal s of each user at the LED of the transmitting end i Superimposed transmission, that is, according to the channel response of different users, different power is allocated, low power is allocated to users with good channels, and high power is allocated to users with poor channels, that is, At the receiving end, the users use interference cancellation (SIC) technology to detect their respective signals. The signal s of each user in this embodiment i Satisfies the uniform distribution of [-1,1], variance N is the total number of users; I DC It is a DC bias to ensure the positive real number requirements of the optical signal. Based on this, the received signal of the kth user is,
[0057]
[0058] where n k is the noise, and the variance is Under this model, the infimum of each user’s transmission rate is
[00...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More