Coherent phase synchronous code division multiple access communications from multiple transponder platforms
First Claim
1. A method for coherent phase synchronous code division multiple access communications between a gateway and multiple subscribers via multiple transponder platforms comprising the step of synchronizing a local reference clock for each subscriber in a service area to a single master reference clock wherein the distance separating the transponder platforms is within a range and wherein the local reference clocks for all subscribers have substantially the same clock phase with respect to the master reference clock and transmitting delayed CDMA message signals from the gateway to an intended subscriber via each of the multiple transponder platforms with respective delays so that the intended subscriber receives the message signals with the same carrier signal phase and an unintended subscriber receives the message signals with different carrier signal phases.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for coherent phase synchronous CDMA communications between a gateway and multiple subscribers via multiple transponder platforms that includes the step of synchronizing a local reference clock for each subscriber in a service area to a single master reference clock for multiple transponder platforms wherein the distance separating the transponder platforms is constrained to a range wherein the local reference clocks for all subscribers have substantially the same phase with respect to the master reference clock.
-
Citations
15 Claims
- 1. A method for coherent phase synchronous code division multiple access communications between a gateway and multiple subscribers via multiple transponder platforms comprising the step of synchronizing a local reference clock for each subscriber in a service area to a single master reference clock wherein the distance separating the transponder platforms is within a range and wherein the local reference clocks for all subscribers have substantially the same clock phase with respect to the master reference clock and transmitting delayed CDMA message signals from the gateway to an intended subscriber via each of the multiple transponder platforms with respective delays so that the intended subscriber receives the message signals with the same carrier signal phase and an unintended subscriber receives the message signals with different carrier signal phases.
-
10. An apparatus for coherent phase synchronous code division multiple access communications between a gateway and multiple subscribers via multiple transponder platforms comprising;
-
a transmitter for transmitting forward link CDMA signals and a delayed synchronous CDMA message signals from a gateway to an intended subscriber via each transponder platform; a receiver for receiving return link CDMA signals at the gateway from the intended subscriber via each transponder platform; a propagation parameter calculator for calculating message signal propagation parameters from the return link CDMA signals; and a reference clock synchronizer for synchronizing a local reference clock of each subscriber to a master reference clock of the gateway from the calculated propagation parameters wherein the local reference clocks of all subscribers have substantially the clock same phase, said transmitter transmitting the synchronous CDMA message signals to an intended subscriber via each of the multiple transponder platforms with respective delays so that an intended subscriber receives the messages with the same carrier signal phase and an unintended subscriber receives the message signals with different carrier signal phases. - View Dependent Claims (11, 12, 13, 14, 15)
-
Specification