Asymmetrical forward/reverse transmission bandwidth

摘要

A wireless communications system employs code-division multiple access information transmission techniques where the uplink and downlink transmission bandwidths are unequal. The higher bandwidth is an integer multiple of the lower bandwidth. The present system requires a base station and a subscriber unit to have two pseudo-random code generators which can be clocked separately. Alignment of the uplink and downlink pseudo-random spreading codes is achieved by truncating the code sequence for the lower speed link at the conclusion of a complete code sequence for the higher speed link.

主权项

1. A wireless terminal in a code division multiple access (CDMA) system, comprising:
a pseudo-random sequence generator to combine values of a first pseudo-random code sequence and a portion of a second pseudo-random code sequence into an output code sequence, wherein a period of the first pseudo-random code sequence and a period of the portion of a second pseudo-random code sequence are equivalent, wherein a length of the first pseudo-random code sequence is a first number of chips, a length of the second pseudo-random code sequence is a second number of chips, the first number of chips being less than the second number of chips, and a length of the output code sequence is a third number of chips, the third number of chips being less than a product of the first number of chips and the second number of chips; and a spreading circuit to spread a signal with the output code sequence, wherein the signal carries information.