Abstract
The standard time division multiple access (TDMA) cellular network is designed so that physically adjacent cells are assigned different frequency bands, or channels, in order to reduce inter-cell interference. A multiple-access scheme is presented in which TDMA is used inside each cell, but different transmitted pulse shapes with low cross-correlations are assigned to adjacent cells. These pulses could be direct-sequence spread-spectrum pulses, which have been proposed for code division multiple access (CDMA) wireless networks. Such a hybrid system combines the high intra-cell capacity of TDMA with the inter-cell and multipath interference rejection capabilities of CDMA. It is concluded that this hybrid scheme offers a potential increase in capacity relative to intra-cell TDMA/inter-cell frequency-division multiple access (FDMA) provided that interference suppression techniques can be used to suppress inter-cell interference. Additional advantages and disadvantages of the scheme are discussed.
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