As opposed to the complex matched filter method, the energy detection is a non-coherent method for TOA estimation which consists of a square-law device, an integrator, a sampler, and a decision mechanism.
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Next, a square-law device and an integrator with sensing interval T measures the received signal energy.
At the receiver, after the received signal pass through a square-law device and an integrator, the decision statistic Z is obtained as [17] Z = Z 1 - Z 2 = ∫ j T f j T f + T r 2 ( t ) d t - ∫ j T f + δ j T f + δ + T r 2 ( t ) d t (5).
It consists of a square-law device, followed by an integrator, sampler, and a decision mechanism.
The received signal is fed to a bandpass filter with bandwidth, followed by the squaring device and the -second integrator.
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The filtered signal is then squared by the squaring device and applied to the integrator.
Borqs is an Android software integrator for mobile devices, which has been deployed in more than 30 Android mobile devices for W-CDMA networks and TD-SCDMA networks.
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