METHOD AND APPARATUS FOR SWITCHING CODE DIVISION MULTIPLE ACCESS MODULATED BEAMS

摘要

In a code division switch each of a plurality or uplink CDMA modulated RF beams, each including a plurality of uplink traffic channels, are down co nverted to IF and overspread with a new orthogonal code having a spreading rate N ti mes that of the spreading code of the uplink CDMA modulated RF beam. All of the overspread beams are combined into a single combined IF stream. The individu al traffic channels are extracted from the combined IF stream by de-overspreadi ng the stream with orthogonal codes and despreading with beam and traffic channel s pecific orthogonal codes. All traffic channels are respread with downlink beam codes anddownlink orthogonal traffic channel codes and joined onto selected ones of downlink CDMA modulated IF beams having common destinations with the included traffic channels. Downlink CDMA modulated IF beams are up converted to RF frequency and transmitted to selected destinations.