| 摘要 |
<p>A CDMA communication system supports underlay transmissions and direct spread overlay transmissions such that the overlay transmissions are at least partially orthogonal to underlay transmissions. A base station supports both the underlay transmissions and the overlay transmissions and includes an interface to a mobile switching center, an underlay unit (206), an overlay unit (204) and at least one radio frequency (RF) unit (212). The interface receives communications intended for a plurality of mobile stations serviced by the base station. These communications include underlay communications intended for mobile stations (MSs) supporting underlay transmissions and overlay communications intended for MSs supporting overlay transmissions. The underlay unit (206) receives the underlay portion of the communications and produces underlay transmissions. The overlay unit (204) receives the overlay portion of the communications and produces overlay transmissions. Then, the underlay transmissions and the overlay transmissions are received by the at least one RF unit and transmitted via at least one antenna (214) to the plurality of MSs. Each of the MSs receives both the underlay transmissions and the overlay transmissions.</p> |
