Code-division multiple-access system with improved utilization of upstream and downstream channels
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United States of America Patent
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Jul 2, 1996
Grant Date -
N/A
app pub date -
Mar 9, 1995
filing date -
Mar 10, 1994
priority date (Note) -
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Abstract
A code-division multiple-access system has a downstream channel for transmission from a base station to a number of mobile stations, and an upstream channel for transmission from the mobile stations to the base station. On the downstream channel, each mobile station's spreading code is divided into two parts, which modulate data transmitted on in-phase and quadrature carriers, respectively, thereby enabling the length of the spreading code to be doubled without increasing the chip rate. On the upstream channel, as soon as a symbol is received from one mobile station, it is despread to estimate its value, then respread and canceled as interference with respect to the other mobile stations, these processes being iterated in a cyclic order of the mobile stations.
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