Multiple user adaptive modulation scheme for MC-CDMA

Details Multiple user adaptive modulation scheme for MC-CDMA Multiple user adaptive modulation scheme for MC-CDMA

2006-10-17

2006-10-17

Nguyen, Chau (Department: 2616)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Fourier transform

C370S342000

Reexamination Certificate

active

07123580

ABSTRACT:
In a multi-user frequency domain spreading downlink MC-CDMA system, a group of sub-carriers can be replaced by an equivalent sub-carrier of a conventional OFDM modem for purposes of resource allocation to improve the system performance. The chips for a given user are spread only within the group. Confinement insures synchronization between different users' chips that is essential to the recovering and separation of user symbols at the receiver. There is no limit imposed on the group size, which permits different spreading code lengths to be used for different scenarios or for performance tuning.

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