Soft handoff with interference cancellation in a wireless...

Details Soft handoff with interference cancellation in a wireless... Soft handoff with interference cancellation in a wireless...

2007-08-07

2007-08-07

Deppe, Betsy L. (Department: 2611)

Pulse or digital communications

Spread spectrum

Frequency hopping

C455S422100

Reexamination Certificate

active

10622663

ABSTRACT:
Techniques are provided to support soft handoff in a frequency hopping OFDMA system. Each sector concurrently supports “non-handoff” users and “soft-handoff” users. A non-handoff user communicates with only one sector, and a soft-handoff user communicates with multiple sectors simultaneously. Non-handoff users are assigned traffic channels by their sole sectors, and soft-handoff users are assigned traffic channels by their “serving” sectors. For each sector, the traffic channels assigned to the non-handoff users are orthogonal to one another and may or may not be orthogonal to the traffic channels assigned to the soft-handoff users. Each sector processes its received signal and recovers the data transmissions from the non-handoff users of that sector. Each sector then estimates the interference due to the non-handoff users and cancels the interference from the received signal. Each sector further processes its interference-canceled signal to recover the data transmissions from the soft-handoff users.

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patent: 6826409 (2004-11-01), Kostic et al.
patent: 2002/0196876 (2002-12-01), Takada

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