Spectrum Sensing for OFDM Signals Using Pilot Induced ... - A*Star

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Spectrum Sensing for OFDM Signals Using Pilot Induced ... - A*Star

6 IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 31, NO. 3, MARCH 2013

(for continual pilots) or LNɛ (for scattered pilots). This will

gives us special advantage to design the algorithm. If we use

known methods to estimate ɛ first and then get Nɛ or LNɛ,

the estimation error is effectively multiplied by N or LN

times. Thus in the following we will propose a new method

that directly estimates Nɛ (for continual pilots) or LNɛ (for

scattered pilots) using the ACs of the received signal.

A. Frequency offset estimation

We consider continual pilot case of model (14). Let ϑ = Nɛ

mod 1. We further define δ = ϑ if 0 ≤ ϑ ≤ 0.5 and δ = ϑ−1

if 0.5

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