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5G air interface debate is revived as C Spire tests Cohere OTFS

Some mobile stakeholders have been frustrated that the first wave of 5G standards, 3GPP Release 15, have stuck with OFDM in the air interface, rather than adopting a more radical modulation technology.  However, additional standards are likely to creep into Release 16 standards, which will provide renewed opportunities for new approaches from giants like Huawei, to start-ups like Cohere Technologies, with its OTFS (Orthogonal Time Frequency Space) modulation scheme. In a clear sign that OTFS is not off the table yet, US mobile operator C Spire has applied for permission to test the technology in its headquarters in Ridgeland, Mississippi, using spectrum in the 3650-3700 band. In its application, C Spire says it believes OTFS may deliver higher spectral efficiency,…

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