7.Orthogonal Variance Multi-Rate Transmission

Orthogonal variance multi-rate transmission is used to carry out variable rate transmissions while maintaining orthogonality between channels in the same propagation path.

Under the W-CDMA system, multi-code transmissions using multiple orthogonal-code channels is used for high-speed transmissions that exceed the maximum transmission rate per code channel.

This method can multiplex code channels without interference to the number of orthogonal-spread codes, since all the spectrum-spread code channels in each path are orthogonalized. Using multiple paths decreases the number of code channels that can be multiplexed due to the cross-correlation between paths, but overall the transmission characteristics are improved from the case of using random codes.

Multi-Rate Transmissions Using Multi-Rate Codes

Created 1999/03