Title :
Advantages of CDMA and spread spectrum techniques over FDMA and TDMA in cellular mobile radio applications
Author :
Jung, Peter ; Baier, Paul Walter ; Steil, Andreas
Author_Institution :
Kaiserslautern Univ., Germany
fDate :
8/1/1993 12:00:00 AM
Abstract :
A unified theoretical method for the calculation of the radio capacity of multiple-access schemes such as FDMA (frequency-division multiple access), TDMA (time-division multiple access), CDMA (code-division multiple access) and SSMA (spread-spectrum multiple access) in noncellular and cellular mobile radio systems is presented for AWGN (additive white Gaussian noise) channels. The theoretical equivalence of all the considered multiple-access schemes is found. In a fading multipath environment, which is typical for mobile radio applications, there are significant differences between these multiple-access schemes. These differences are discussed in an illustrative manner revealing several advantages of CDMA and SSMA over FDMA and TDMA. Novel transmission and reception schemes called coherent multiple transmission and coherent multiple reception are briefly presented
Keywords :
cellular radio; channel capacity; code division multiple access; fading; frequency division multiple access; spread spectrum communication; time division multiple access; white noise; AWGN channels; CDMA; FDMA; SSMA; TDMA; additive white Gaussian noise; cellular mobile radio; code-division multiple access; coherent multiple reception; coherent multiple transmission; fading multipath environment; frequency-division multiple access; radio capacity; spread-spectrum multiple access; time-division multiple access; unified theoretical method; AWGN; Bandwidth; Fading; Frequency conversion; Frequency division multiaccess; Land mobile radio; Land mobile radio cellular systems; Multiaccess communication; Spread spectrum communication; Time division multiple access;
Journal_Title :
Vehicular Technology, IEEE Transactions on
