Abstract :
The combination of multicarrier (MC) modulation and code division multiple access (CDMA) is seen as a very promising technique for the development of high capacity wireless communications. However, while downlink design is possible even with coherent detection techniques, a similar solution for the uplink appears to be difficult. In fading channels, the performance of coherent schemes depends strongly on the accuracy of the channel estimation, as well as the adopted equalization techniques. We consider a novel encoding/detection technique involving chip-level differential encoding, which has been suggested in a paper by Cavallini, Giannetti, Luise and Reggianini (see IEEE Trans. on Commun., vol.45, no.4, p.456-63, 1997), although in a different framework. We compare the performance of this scheme with that of symbol-level differential encoding and coherent PSK
Keywords :
cellular radio; code division multiple access; encoding; fading channels; phase shift keying; radio links; signal detection; MC-CDMA systems; cellular radio; channel estimation accuracy; chip-level differential encoding; coherent PSK; coherent detection; encoding/detection technique; equalization techniques; fading channels; high capacity wireless communications; multicarrier modulation; performance; symbol-level differential encoding; uplink; Bit rate; Demodulation; Downlink; Encoding; Fading; Modulation coding; Multiaccess communication; Multicarrier code division multiple access; Multiple access interference; Proposals;
