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Noise power estimation method for OFDM frequency spectrum sensing

A noise power and spectrum sensing technology, applied in the field of noise power estimation for OFDM spectrum sensing

Active Publication Date: 2015-08-05
NINGBO UNIV
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Problems solved by technology

However, in the process of OFDM spectrum sensing, it is unknown whether the received signal contains OFDM signals, so the noise power estimation method in the existing literature cannot be practically used for OFDM spectrum sensing

Method used

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  • Noise power estimation method for OFDM frequency spectrum sensing
  • Noise power estimation method for OFDM frequency spectrum sensing
  • Noise power estimation method for OFDM frequency spectrum sensing

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Embodiment Construction

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0017] A noise power estimation method for OFDM spectrum sensing proposed by the present invention, its overall realization block diagram is as follows image 3 shown, which includes the following steps:

[0018] ① Assuming that there is one antenna in the cognitive radio system for receiving continuous radio frequency signals in the time domain, the radio frequency signals received by the antenna are expressed as a function of time t, denoted as x(t).

[0019] ② Perform down-conversion processing on x(t) to obtain a continuous baseband signal in the time domain, denoted as x'(t); then perform time-domain sampling processing on x'(t) with a fixed sampling period to obtain the corresponding The time-domain discrete baseband signal of x(t) is expressed as a function of the time-domain sampling sequence number n, which is denoted as x(n), where ...

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Abstract

The invention discloses a noise power estimation method for OFDM frequency spectrum sensing. According to the method, a continuous time domain radio-frequency signal is received by utilizing an antenna, downconversion and time domain sampling processing are performed on the continuous time domain radio-frequency signal to obtain a discrete time domain baseband signal then, and, finally, noise power is estimated according to the discrete time domain baseband signal. The method is advantageous in that, on the condition that whether the received signal contains an OFDM signal is not known, the noise power can still be effectively estimated.

Description

technical field [0001] The present invention relates to a noise power estimation technology in spectrum sensing of a cognitive radio system, in particular to a noise power estimation method for OFDM (Orthogonal Frequency Division Multiple, Orthogonal Frequency Division Multiplexing) spectrum sensing. Background technique [0002] With the rapid growth of wireless communication services, people's demand for spectrum resources continues to increase, and the phenomenon of lack of spectrum resources becomes more and more serious. On the one hand, the rapid development of wireless communication services and the continuous emergence of various systems, protocols, and networks have made more people need to use radio spectrum; on the other hand, many frequency bands have been allocated to authorized users, and non-authorized users can only use Those unlicensed frequency bands are very scarce, and the low utilization rate of spectrum resources in the existing fixed spectrum resource ...

Claims

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Application Information

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IPC IPC(8): H04B17/382H04L27/26
Inventor 金明
Owner NINGBO UNIV
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