Title :
Peak-to-average reduction via optimal Walsh code allocation in third generation CDMA systems
Author :
Shanbhag, Abhijit G. ; Tiedemann, Edward G.
Author_Institution :
Morphics Technol. Inc., Campbell, CA, USA
Abstract :
The effect of a specific set of assigned Walsh functions and the resulting variation in the amplitude, specifically the peak-to-average ratio of the amplitude of the transmit waveform from a base station in a cdma2000 system is studied. An easily implementable algorithm for optimally assigning the Walsh functions, with the objective of minimizing the peak-to-average ratio of the amplitude of the transmit waveform in an operating cdma2000 system is proposed. The use of orthogonal signals as an alternative to the Walsh functions is also considered with respect to the resulting variation in the peak-to-average ratio of the transmitted waveform
Keywords :
Walsh functions; code division multiple access; codes; land mobile radio; multiuser channels; spread spectrum communication; QPSK; Walsh functions; algorithm; amplitude variation; base station; cdma2000 system; optimal Walsh code allocation; orthogonal signals; peak-to-average ratio; peak-to-average reduction; third generation CDMA systems; transmit waveform amplitude; variable Walsh spreading approach; Base stations; Cost function; Intermodulation distortion; Linearity; Modulation coding; Multiaccess communication; Nonlinear distortion; Peak to average power ratio; Power amplifiers; Quadrature phase shift keying;
Conference_Titel :
Spread Spectrum Techniques and Applications, 2000 IEEE Sixth International Symposium on
Conference_Location :
Parsippany, NJ
Print_ISBN :
0-7803-6560-7
DOI :
10.1109/ISSSTA.2000.876496
