Spread spectrum communications handbook (revised ed.)
Spread spectrum communications handbook (revised ed.)
CDMA: principles of spread spectrum communication
CDMA: principles of spread spectrum communication
Signals & systems (2nd ed.)
Interleaved FDMA—a new spread-spectrum multiple-access scheme
Multi-carrier spread-spectrum
Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Optimal decorrelating receivers for DS-CDMA systems: a signalprocessing framework
IEEE Transactions on Signal Processing
Blind adaptive multiuser detection
IEEE Transactions on Information Theory
IEEE Communications Magazine
Broadband wireless access solutions based on OFDM access in IEEE 802.16
IEEE Communications Magazine
CS-OFDMA: a new wireless CDD physical layer scheme
IEEE Communications Magazine
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A new methodology that applies frequency orthogonality to the spreading code design has been presented. The main purpose is to reduce the receiver complexity of the cyclic prefix code division multiple access (CP-CDMA) over the downlink channel and to enable parallel transmission over the uplink channel. The receiver complexity has been found for requiring full-band FFT and IFFT calculations in the channel equalizer. To handle this problem, we developed the comb spectrum codes organized in frequency orthogonal groups, in each of which the codes have time correlation orthogonality. For the downlink channel, the reduction of complexity in signal processing of a CS-CDMA receiver is due to that the separation of groups is simple and each separated group is in the form of a narrower bandwidth CP-CDMA. Thus, the full-band FFT and IFFT can be replaced by the partial FFT and partial IFFT as shown in this proposed approach. For the uplink channel, we assign the code groups to different users to form a group division multiple access (GDMA) for enabling an independent channel equalization of each user at base station. The theoretical analysis and the simulation results agree well with each other and both confirm the effectiveness of this approach.