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Very low rate convolution codes for maximum theoretical performance of spread-spectrum multiple-access channels

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1 Author(s)
Viterbi, A.J. ; QIALCOMM Inc., San Diego, CA, USA

A spread-spectrum multiple-access (SSMA) communication system is treated for which both spreading and error control is provided by binary PSK modulation with orthogonal convolution codes. Performance of spread-spectrum multiple access by a large number of users employing this type of coded modulation is determined in the presence of background Gaussian noise. With this approach and coordinated processing at a common receiver, it is shown that the aggregate data rate of all simultaneous users can approach the Shannon capacity of the Gaussian noise channel

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Selected Areas in Communications, IEEE Journal on  (Volume:8 ,  Issue: 4 )