Patent ID: 7428261
Filing Date: 2008-09-23
Classification: H04B,H04J,H04L

Abstract:
1. A method for canceling other-system interference in a multicarrier system, the method comprising: receiving a signal including content from a target system as well as an interfering system; equalizing the received signal based on a known channel response of the interfering system, thereby providing estimates of data symbols transmitted by the interfering system; de-spreading the estimates of the data symbols pursuant to a known spreading code of the interfering system; determining values for actual data symbols transmitted by the interfering system based on the estimated data symbols, thereby providing a vector of actual data symbol estimates for the interfering system; re-spreading the vector of actual data symbol estimates pursuant to the known spreading code of the interfering system; re-applying the known channel response of the interfering system, thereby providing an estimate of the interfering system signal; subtracting the estimate of the interfering system signal from the received signal, thereby providing a signal that is external interference-cancelled; equalizing the signal that is external interference-cancelled based on a known channel response of the target system, thereby providing estimates of data symbols transmitted by the target system; de-spreading the estimates of data symbols transmitted by the target system pursuant to a known spreading code of the target system; determining values for actual data symbols transmitted by the target system based on the estimated data symbols, thereby providing a vector of actual data symbol estimates for the target system; re-spreading the vector of actual data symbol estimates pursuant to the known spreading code of the target system; re-applying the known channel response of the target system, thereby providing an estimate of the target system signal; and subtracting the estimate of the target system signal from the signal that is external interference-cancelled, thereby providing a signal that is external and internal interference-cancelled.