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OFDM carrier modulation technology-based weighting power distribution method in cognitive radio system

A cognitive radio and carrier modulation technology, applied in the field of power distribution based on OFDM carrier modulation technology, can solve the problems of low information transmission rate, low spectrum utility and high allocation complexity

Inactive Publication Date: 2012-07-04
HARBIN INST OF TECH
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Problems solved by technology

[0004] The present invention aims to solve the problem of low information transmission rate of the system due to the high allocation complexity and low spectrum utility of the existing power allocation method, thereby providing a weighted power allocation method based on OFDM carrier modulation technology in a cognitive radio system

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  • OFDM carrier modulation technology-based weighting power distribution method in cognitive radio system
  • OFDM carrier modulation technology-based weighting power distribution method in cognitive radio system
  • OFDM carrier modulation technology-based weighting power distribution method in cognitive radio system

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specific Embodiment approach 1

[0035] Specific implementation mode 1. Combination figure 1 with figure 2 Describe this specific embodiment, the weighted power allocation method based on OFDM carrier modulation technology in the cognitive radio system, it is realized by the following steps:

[0036] Step 1. In the cognitive radio system, set the total information transmission rate of the cognitive users as the objective function, assume that the cognitive users obtain the spectrum with a total bandwidth of B through spectrum sensing, and use the OFDM modulation technology to obtain a total bandwidth of B The frequency spectrum of is evenly divided into M mutually orthogonal subcarriers, and M is a positive integer, then the objective function of the cognitive user is:

[0037] arg max p R total = B M Σ j = ...

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Abstract

An OFDM (Orthogonal Frequency Division Multiplexing) carrier modulation technology-based weighting power distribution method in a cognitive radio system relates to a power distribution method and solves the problems that the distribution complexity is high, and the signal transmission speed of a system is low due to the low frequency spectrum utility in a conventional power distribution method. According to the invention, a Lagrange multiplier method is adopted to perform power primary distribution; and a secondary distribution is performed according to the weight of the subcarrier channel primary distribution power occupied in the power sum, thereby obtaining the power optimum allocation for subcarriers. The distribution method provided by the invention overcomes the problems of large complexity, difficulty in practical application, small complexity and low frequency spectrum utility in the prior art, greatly reduces the arithmetic complexity, approaches optimum allocation, and greatly improves the information transmission speed of the system. The distribution method is suitable for the cognitive radio system.

Description

technical field [0001] The present invention relates to the technical field of power control in a cognitive radio communication system, in particular to a power allocation method based on OFDM (Orthogonal Frequency Division Multiplexing) carrier modulation technology. Background technique [0002] In cognitive radio communication systems, how to achieve the optimal allocation of limited power has always been an important research content. Among the existing methods, Hughes-Hartogs proposed a greedy method, which is to calculate the additional power required for each additional transmission bit on the channel until the final transmission rate requirement is met, which is the optimal allocation of power allocation. The complexity of this method is O(2 M ), where M is the number of channels. Due to the high complexity and large amount of calculation of this method, Krongold proposed to obtain the optimal allocation of power according to the preset rate-SNR table. Compared wit...

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Application Information

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IPC IPC(8): H04W72/04H04L27/26
CPCY02B60/50Y02D30/70
Inventor 马琳杨小龙谭学治王垚王孝舒鹏飞
Owner HARBIN INST OF TECH