Oversampled perfect reconstruction DFT modulated filter banks for multi-carrier transceiver systems

Joint synchronization and equalization in the uplink of multi-user OPRFB transceivers

“…Fig. 1) with U = 4 time-synchronized users (results are presented for user u = 1), burst size N = 60 symbols, M = 64 subbands, K = 72 up/down-sampling factor, sampling rate F s = 41.67kHz, carrier frequency F c = 800MHz and prototype filter of length D = 1728 designed as in [6]. Each user is allocated 16 subbands based on the schemes illustrated in Fig.…”

“…3, where K represents the upsampling/downsampling factor and K > M is assumed (oversampling) [6]. For i ∈ {1, · · · , |S u |}, x u i [n] denotes the complex-valued symbol sequence transmitted by this user on the ith subband of the set S u at discrete-time nT s , where n ∈ Z, T s = F −1 s and F s is the input sampling rate.…”

“…As proposed in [6], to enforce the perfect reconstruction (PR) property, the paraconjugates of the transmit filters are employed as receive filters, i.e., g u…”

“…Among the various approaches available for the design of FBMC transceiver systems, lately, much interest has been directed towards oversampled perfect reconstruction filter banks (OPRFB), e.g. [6], [7]. Indeed, OPRFB benefits from improved robustness against narrowband interference and CFO, while its multiuser implementation (i.e., MU-OPRFB) is straightforward.…”

“…Also, the deleterious effect of frequency selective channels in these transceivers should be removed through equalization. In the case of mildly selective channels with a large number of narrow subbands, it is sufficient to use singletap per subband equalizers for OPRFB systems [6], whereas for highly selective channels, more advanced equalization techniques may be required.…”