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Context 1
... OFDM/OQAM system model, adopted in this work, makes use of a specific filter bank structure where the up- sampling and downsampling factor equals half the number of subcarriers, denoted by M (see [8] Fig. 1). At each input symbol time, with symbol duration T s , a vector of discrete input symbols is loaded on the M available subcarriers. The latter are separated in frequency by F s = 1/T s , so that the system occupies a total bandwidth of W = M F s ...
Context 2
... depicted in Fig. 1, we consider a multiuser scenario where, in the uplink of a multiple access system, users 1 to U transmit their pilot and data symbols over the channel to the same base station. We assume the users are not necessarily experiencing identical CFO, STO and CIR and that the afore- mentioned parameters for different users are decoupled from ...
Context 3
... depicted in Fig. 1, we consider a multiuser scenario where, in the uplink of a multiple access system, users 1 to U transmit their pilot and data symbols over the channel to the same base station. We assume the users are not necessarily experiencing identical CFO, STO and CIR and that the afore- mentioned parameters for different users are decoupled from one another. To employ the proposed OFDM/OQAM system in a multiuser scenario, as depicted in Fig. 2, the necessary modification is to consider the relevant subcarriers or samples associated with the desired user. Specifically, we denote by S u the set of subcarrier indexes allocated to the uth user. The cardinal of this set |S u | represents the total number of subcarriers allocated to this user. Hence, the transmitter output signal of associated with this user at discrete time mT s /M , is given ...
Context 4
... OFDM/OQAM system model, adopted in this work, makes use of a specific filter bank structure where the up- sampling and downsampling factor equals half the number of subcarriers, denoted by M (see [8] Fig. 1). At each input symbol time, with symbol duration T s , a vector of discrete input symbols is loaded on the M available subcarriers. The latter are separated in frequency by F s = 1/T s , so that the system occupies a total bandwidth of W = M F s ...
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Citations
... In this section, the CE performance based on the proposed preamble structure is simulated. Truncation of an IOTA filter with length 4T 0 [33] is chosen as the prototype filter in this simulation. The fundamental parameters are listed in Table 1 where ITU is the International Telecommunications Union. ...
This paper investigates the problem of synchronization for offset quadrature amplitude modulation based orthogonal frequency division multiplexing (OFDM/OQAM) systems based on the genetic algorithm. In order to increase the spectrum efficiency, an improved preamble structure without guard symbols is derived at first. On this basis, instead of deriving the log likelihood function of power spectral density, joint estimation of the symbol timing offset and carrier frequency offset based on the preamble proposed is formulated into a bivariate optimization problem. After that, an improved genetic algorithm is used to find its global optimum solution. Conclusions can be drawn from simulation results that the proposed method has advantages in the joint estimation of synchronization.
