Interference management for soft handoff and broadcast...

Details Interference management for soft handoff and broadcast... Interference management for soft handoff and broadcast...

2006-12-26

2006-12-26

Bayard, Emmanuel (Department: 2611)

Pulse or digital communications

Spread spectrum

Frequency hopping

C375S130000

Reexamination Certificate

active

07154933

ABSTRACT:
Techniques are provided to manage interference for soft handoff and broadcast services in a wireless frequency hopping communication system (e.g., an OFDMA system). These techniques may be used for the forward and reverse links. In a first scheme, an FH function ƒsho(r,T) is used for soft-handoff users, an FH function ƒsi(k,T) is used for users not in soft handoff in each sector si, and the FH function ƒsi(k,T) is modified to be orthogonal to the FH function ƒsho(r,T) if and when necessary. In a second scheme, the FH function ƒsho(r,T) used for soft-handoff users is defined to be orthogonal to or have low correlation with the FH function ƒsi(k,T) used for users not in soft handoff in each sector si, so that modification of the FH function ƒsi(k,T) is not needed. The FH function ƒsi(k,T) for each sector may be defined to be pseudo-random with respect to the FH functions ƒsi(k,T) for other sectors.

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