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To optimize the use of the spectrum, it is expected that the next generationof wireless networks (5G) will enable coexistence of newly introduced serviceswith legacy cellular networks. These new services, like Device-To-Device (D2D)communication, should require limited synchronization with the legacy cell tolimit the amount of signaling overhead in the network. However, it is knownthat Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) used inLong Term Evolution-Advanced (LTE-A) is not fit for asynchronous environments.This has motivated the search for a new waveform, able to enhance coexistencewith CP-OFDM. Namely, it has been widely suggested that new devices could useOFDM/Offset-Quadrature Amplitude Modulation (OFDM/OQAM) to reduce theinterference they inject to legacy cellular users. However, values ofinterference are usually measured at the input antenna of the receiver, basedon the PSD of the interfering signal. We showed in previous works that thismeasurement is not representative of the actual interference that is seen afterthe demodulation operations. Building on this finding, we provide in this paperthe first exact closed forms of cross-interference between OFDM/OQAM andCP-OFDM users. Our results prove that using OFDM/OQAM only marginally reducesinterference to legacy users, in contradiction with many results in theliterature.

Coexistence in 5G: Analysis of Cross-Interference between OFDM/OQAM and Legacy Users