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A combination of multi-carrier modulation (e.g., OFDM) and spread-spectrum (e.g., DS-CDMA) called MC-SS is considered as a potential candidate for the wireless 4G technology. Most present synchronization techniques for OFDM can also be used for the downlink MC-SS system. However, they are not suitable for the uplink MC-SS system because every user's signal arrives at the base station asynchronously...
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