Verdu, “Multiuser detection” Cambridge, Cambridge University Press, 1998. Lindner, “Multiuser/multisubchannel detection based on recurrent neural network structures for linear modulation schemes with general complex-valued symbol alphabet,” Proceedings COST 262 Workshop Multiuser Detection in Spread Spectrum Communications, Schloss Reisensburg, pp. Lindner, “MC-CDMA in the context of general multiuser/multisubchannel transmission methods,” Europen Trans.Telecomm., vol. G Teich, “Future mobile communication systems: signal processing in time, space, and user direction,” DSPCS’99, February 1999, Australia, pp 281–288, 1999. In Europe, Ku-band downlink is used from 10.7 GHz to 12.75 GHz for direct broadcast satellite services, such as Astra. Moeneclaey, “The effect of carrier frequency offsets on downlink and uplink MC-DS-CDMA”, IEEE Trans. Cox, “Robust frequency and timing synchronization of OFDM,” IEEE Trans. Moose, “A technique for orthogonal frequency division multiplexing frequency offset correction,” IEEE Trans. TDD (Time Division Duplex) LTE Bands require only a single band which is used for both the uplink and downlink. 5925 MHz to 6425 MHz is uplink band where as 3700 to 4200 MHz is downlink band. While 5 GHz offers better throughput and more capacity, 2.4 GHz has longer signal range and may better support the growing number of IoT nodes, which often need to transmit tiny amounts of data at a distance in regularly scheduled intervals. What’s the difference between uplink and downlink in satellite communication 6GHz band frequency is used for uplink and 4GHz frequency band is used for downlink in C band satellite communication operation. Häggman, “Intercarrier interference self-cancellation scheme for OFDM mobile communi-cation systems,” IEEE Trans. It also adds support for downlink MU-MIMO in 2.4 GHz. Armstrong, “Analysis of new and existing methods of reducing intercarrier interference due to carrier frequency offset in OFDM”, IEEE Trans. In this paper, we study the sensitivity of uplink and downlink MC-DS-CDMA to carrier frequency offsets, assuming orthogonal spreading sequences.
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