Low-complexity power control method based on discontinuous carrier OFDM system

A technology of power control and low complexity, applied in power management, multi-frequency code system, electrical components, etc., to achieve the effect of maximizing channel capacity and high communication rate requirements

Inactive Publication Date: 2009-10-14
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0047] However, the amplitude attenuation of the power spectrum side lobes of each orde

Method used

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  • Low-complexity power control method based on discontinuous carrier OFDM system
  • Low-complexity power control method based on discontinuous carrier OFDM system
  • Low-complexity power control method based on discontinuous carrier OFDM system

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Embodiment Construction

[0060] The present invention adopts the square proportional control method, which is a compromise between the medium step step method and the inverse proportional method in the background technology. The equal-step ladder method is too subjective to think that the side lobes of each order of the carrier sink in a linear relationship, while the inverse proportional method only relies on the side lobe interference information and ignores the quality of the channel. In fact, after curve fitting, it is found that each order of the carrier The collapse of the order side lobes is exponential. The square ratio method of the present invention is expressed as:

[0061] P i C = i 2 * I th Σ i = 1 ...

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Abstract

The invention discloses a low-complexity power control method based on a discontinuous carrier OFDM system, which adopts the second-degree parabola to replace the linear function to simulate the amplitude attenuation proportion of the power spectrum side lobe of each order of the discontinuous carrier OFDM system for power control according to the square proportion. The method comprises the following steps: (1), an order is determined; (2), the position of an available subcarrier in a spectrum pool is determined; (3), the out-of-band radiation interference information of a secondary user is fitted according to the order, and the total power is taken as the extreme water injection and distribution transmitting power; and (4), the channel capacity and the consumed power of an NC-OFDM system are counted by statistics. The invention self-adaptively loads the transmitting power of all the subcarriers on the premise that the interference power of the secondary user to the major user is limited, meets the requirement of the highest communication speed and enables the channel capacity of the discontinuous carrier OFDM system to be maximized.

Description

technical field [0001] The invention relates to an adaptive power control method of a discontinuous carrier OFDM (orthogonal frequency division multiplexing) system, belonging to the technical field of wireless communication. Background technique [0002] In a Dynamic Spectrum Access (Dynamic Spectrum Access) network (also known as a cognitive radio network), a secondary user obtains a dynamic access opportunity to perform communication transmission under the condition that the authorization does not cause interference to the primary user. The "spectrum pool" (Spectrum Pooling) strategy proposed by Timo.A.Weiss can effectively improve the efficiency of spectrum use, that is, after the secondary user is authorized, he can use the frequency band in the unified spectrum pool that is not occupied by the primary user, which can be more efficient. Effectively utilize the entire target frequency band. At the same time, Orthogonal Frequency Division Multiplexing (OFDM) technology, ...

Claims

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Application Information

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IPC IPC(8): H04W52/26H04L27/26
Inventor 袁东风杨子原
Owner SHANDONG UNIV
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