A Channel Spectrum Sensing Method Based on Packet Data Sequential Energy Detection
A sequential energy detection and grouping data technology, applied in the field of channel spectrum sensing, can solve the problems of insufficient consideration of the time correlation of sensing information and large amount of calculation
Inactive Publication Date: 2016-05-25
NANJING TECH UNIV
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[0005] To sum up, in the CR system, the main user is required not to change the state frequently, and the likelihood judgment method of point-by-point comparison between SD and SED does not fully consider the temporal correlation of perceptual information, and the amount of calculation is large
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[0047] Such as figure 1 As shown, when using the existing Energy Detection (ED), the available channel of the secondary user depends on the channel usage of the primary user. If the activity of the primary user is modeled as an "ON-OFF" model, the available channel is in The user occupies the channel "ON" and does not occupy the channel "OFF" alternately between two states. In order to realize dynamic spectrum access and protect the primary user, the secondary user periodically detects the signal of the primary user to determine whether there is a primary user in the frequency band. figure 1 Sensing period (sensingperiod) T sp Contains sensing time T st and transmission time (transmissiontime) T tt , and the channel detection time (channel detection time) T cdt Contains N Ts sp (T sp ≤T cdt ). Secondary users perceive available channels before transmission, which facilitates communication between secondary users. When the primary user is in the "ON" state, the seconda...
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The invention provides a channel frequency spectrum sensing method based on grouped data type sequential energy detection. The channel frequency spectrum sensing method comprises the following steps: periodically sampling channels in channel detection time by a sensing period, grouping sensing signals in sensing time within the sensing period, and combining all groups to obtain supersampling; calculating the log-likelihood ratio of a supersampling sequence; setting the judgment criterion of detection statistic volume according to a sequential detection process; repeatedly executing the step on sensing signals in sensing time within next sensing period until the occupying condition of the channel is obtained in the channel detection time. The channel frequency spectrum sensing method prolongs data transmission time, improves handling capability, simplifies log-likelihood ratio calculating process, reduces the calculation burden of secondary users, reduces the influence of short-term channel randomness and improves the channel frequency spectrum sensing efficiency, thereby indirectly improving the handling capability.
Description
technical field [0001] The invention relates to a channel spectrum sensing method, in particular to a channel spectrum sensing method based on packet data sequential energy detection. Background technique [0002] Cognitive Radio (CR) is an intelligent communication technology that can improve the utilization of wireless spectrum resources. Under the condition of ensuring that the primary user is not interfered, the secondary user finds the spectrum hole of the primary user through sensing technology, selects the best available channel to access, and improves the spectrum utilization. Spectrum sensing technology is the basis and prerequisite for realizing CR. Energy Detection (ED), which is simple and easy to implement without any prior knowledge, is widely used in spectrum sensing. However, cognitive networks usually perform spectrum detection under low signal-to-noise ratio. If the energy detector still needs to achieve good detection performance, the required detection ...
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IPC IPC(8): H04B17/382
Inventor 王天荆刘国庆刘浩
Owner NANJING TECH UNIV