Patent ID: 10491261

Abstract:
A transceiver block for multi-user, duplex, wireless access system architecture called Multi Carrier Frequency Modulated Spread Spectrum System (MC FM SS). Here symbols are transmitted at multiple subcarriers where each subcarrier is FM or phase encoded with the data. The data is spread in time/bandwidth using a pseudo-random (PN) sequence. In one realization the transmission is performed with the guard ring carriers and/or pilot subcarriers of an Orthogonal Frequency and Code Division Multiplexing, OFDM, system carried on the main RF carrier. The MC FM SS transmits the data symbol over N subcarriers, with each subcarrier encoded in frequency or phase. In Variable Spreading Factor Orthogonal Frequency and Code Division Multiplexing, VSF OFDM, by DoCoMo Japan with 1024 (which can increase to e.g. 6144) carriers are proposed in Long Term Evolution (LTE) 4G system in the down link direction and 2 carriers MC DS CDMA are used in the uplink direction.