Title :
Coded CDMA in cooperative channels
Author :
Karami, Ebrahim ; Shiva, Mohsen ; Abtahi, Mohammad
Author_Institution :
Iran Telecommun. Res. Center, Tehran, Iran
fDate :
30 May-1 June 2005
Abstract :
In this paper, a new structure for cooperative channels based on coded code division multiple access (CDMA) is proposed. CDMA, with the special structure of cooperative schemes can increase the sum capacity of wireless channels and improve the quality of user-partner link that enhances the overall performance of the system. This structure is simulated for 4 state systematic convolutional code in single user and multiuser cases with Gold spreading sequences for user-partner link with different Rice factor and Rayleigh propagation for user-receiver and partner-receiver links. Simulations confirm the efficiency of this scheme especially in user-partner links with high Rice factor.
Keywords :
Rayleigh channels; Rician channels; channel capacity; channel coding; code division multiple access; convolutional codes; diversity reception; mobile radio; sequences; spread spectrum communication; 4 state systematic convolutional code; Gold spreading sequences; Rayleigh propagation; Rice factor; code division multiple access; coded CDMA; cooperative channels; link quality; multiusers; partner-receiver links; performance; single user; user-receiver links; wireless channel sum capacity; Antenna arrays; Attenuation; Convolution; Convolutional codes; Diversity methods; Fading; Multiaccess communication; Receiving antennas; Telephone sets; Transmitting antennas; CDMA; convolutional codes; cooperative diversity;
Conference_Titel :
Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st
Print_ISBN :
0-7803-8887-9
DOI :
10.1109/VETECS.2005.1543301
