Frequency spectrum sensing method and system

A technology of spectrum sensing and cognitive radio, which is applied in transmission system, transmission monitoring, network planning, etc., can solve problems such as adjacent channel leakage interference, leakage interference, and low detection performance, and achieve time saving, robust detection performance, and detection high performance effect

Active Publication Date: 2013-07-17
DATANG MOBILE COMM EQUIP CO LTD
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AI Technical Summary

Problems solved by technology

[0018] Since the cognitive radio system needs to keep silent during the spectrum sensing process, the cognitive radio system cannot perform normal communication during the spectrum sensing process, which wastes wireless resources; furthermore, for the energy detection algorithm, its detection performance is not high and cannot Meet the requirements of perceptual sensitivity, which requires a longer detection time overhead
On the other hand, energy detection is susceptible to interference from other wireless signals, such as TV adjacent channel leakage interference or cognitive radio system adjacent channel leakage interference or interference from remote systems. Detection is affected by noise uncertainty caused by factors such as temperature, resulting in non-robust detection
On the other hand, the detection performance of the DTMB system synchronization method is not high, and the time required to meet the sensing sensitivity is relatively long, so it is not suitable for spectrum sensing of DTMB signals

Method used

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Embodiment 1

[0039] Embodiment 1 of the present invention provides a spectrum sensing method for implementing spectrum sensing in a cognitive radio system, such as Figure 4 As shown, the method includes the following steps:

[0040] In step 401, the cognitive radio system (such as the spectrum sensing module of the cognitive radio system) receives signals in one or more discrete silent periods, and processes the received signals to obtain baseband signals.

[0041] In the embodiment of the present invention, in the TD-LTE (TD-SCDMA Long Term Evolution, Time Division Synchronous Code Division Multiple Access Long Term Evolution) system, one or more discrete silent periods are specifically one or more GPs of the TD-LTE system (guard slot); or, one or more discrete TD-LTE silent subframes.

[0042] In step 402, the cognitive radio system obtains detection statistics according to the baseband signal, and determines a spectrum sensing result according to the detection statistics.

[0043] Sp...

Embodiment 2

[0140] Embodiment 2 of the present invention provides a spectrum sensing method, assuming that TD-LTE has a cognitive radio function, that is, the TD-LTE base station has a cognitive module to find available idle frequency bands of the DTMB broadcasting system, and the special subframe configuration of TD-LTE If the configuration is 0, the spectrum sensing process includes:

[0141] Step 1, the spectrum sensing module on the TD-LTE base station side maintains downlink synchronization with the TD-LTE base station;

[0142] Step 2, the spectrum sensing module receives the DTMB signal of a certain frequency point in the GP of TD-LTE;

[0143] Step 3, the spectrum sensing module filters and samples the received signal to obtain a DTMB baseband signal whose symbol rate is 7.56MSymbols / s;

[0144] Step 4, above-mentioned DTMB baseband signal is intercepted, obtains the signal x(n) that length is 4725 symbol lengths, n=0,...,4724;

[0145] The x(n) signal is zero-filled to obtain u...

Embodiment 3

[0170] Based on the same inventive concept as the above method, an embodiment of the present invention also provides a spectrum sensing system (it may specifically be a cognitive radio system, or a spectrum sensing module in a cognitive radio system), such as Figure 7 As shown, the system includes:

[0171] The first acquisition module 11 is configured to receive signals during one or more discrete silent periods, and process the received signals to obtain baseband signals;

[0172]The second obtaining module 12 is used to obtain detection statistics according to the baseband signal;

[0173] A determining module 13, configured to determine a spectrum sensing result according to the detection statistics.

[0174] The second acquisition module 12 is specifically used to filter the baseband signal through a filter, and perform modulo processing on the filtered result; select the maximum value of the modulo processed result, and calculate the an average value of the modulo pro...

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Abstract

The invention discloses a frequency spectrum sensing method and system. The frequency spectrum sensing method includes that a cognitive radio system receives signals at a silent period or a plurality of discrete silent periods and processes the received signals to obtain baseband signals; and the cognitive radio system obtains detecting statistics according to the baseband signals and confirms a frequency spectrum sensing result according to the detecting statistics. In the embodiment of the invention, the frequency spectrum sensing method has the advantages of being capable of obtaining stable detecting performance under certain interference environment and high in the detecting performance; capable of completing frequency spectrum sensing in a short time to save the time consumption of detection; and capable of completing the detection of the frequency spectrum sensing at the plurality of discrete silent periods to be flexibly applied to various cognitive radio systems.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a spectrum sensing method and system. Background technique [0002] With the rapid development of the mobile communication industry, the contradiction between the growing demand for broadband wireless communication and the limited spectrum resources is becoming increasingly obvious; and with the rapid development of mobile services in the future, telecom operators will face more serious shortage of spectrum resources; On the one hand, the spectrum usage of some wireless systems is almost free in time and area (such as the broadcast TV band, with the development of the broadcast TV system from analog transmission to digital transmission, because digital transmission can greatly increase the transmission capacity, making many broadcast TV The frequency band is idle for a long time); based on this, in order to solve the problem of shortage of spectrum resources, CR (C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00
CPCH04W16/14H04B17/00
Inventor 蒋成钢白文岭李媛媛杨宇
Owner DATANG MOBILE COMM EQUIP CO LTD
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