Orthogonal variable spreading factor (OVSF) code assignment

Details Orthogonal variable spreading factor (OVSF) code assignment Orthogonal variable spreading factor (OVSF) code assignment

2008-05-27

2008-05-27

Tran, Khanh C. (Department: 2611)

Pulse or digital communications

Spread spectrum

Reexamination Certificate

active

07379489

ABSTRACT:
The invention includes a system and methods for orthogonal variable spreading factor (OVSF) code assignment, de-allocation and code tree pruning. The invention also includes OVSF code identification and storage schemes. Embodiments are provided for code tree pruning, code assignment and de-allocation. These embodiments apply to both slotted and non-slotted code division multiple access systems.

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Cheng et al., “OVSF Code Channel Assignment for IMT-2000,” IEEE Vehicular Technology Conference Proceedings, 2000-Spring Tokyo, May 2000, vol. 3, pp. 2188-2192.
Minn et al., “Dynamic Assignment of Orthogonal Variable-Spreading-Factor Codes in W-CDMA,” IEEE Selected Areas in Communications Journal, vol. 18, Issue 8, Aug. 2000, pp. 1429-1440.
Chen et al., “A Novel Code Assignment Scheme for W-CDMA Systems,” IEEE Vehicular Technology Conference, vol. 2, Oct. 2001, pp. 1182-1186.
Cheng et al., “OVSF Code Channel Assignment for IMT-2000”, IEEE Vehicular Technology Conference Proceedings, 2000 Spring Tokyo, vol. 3, May 2000, pp. 2188-2192.
Minn et al., “Dynamic Assignment for Orthogonal Variable-Spreading-Factor Codes in W-CDMA,” IEEE Selected Areas in Communications Journal, vol. 18, Issue 8, Aug. 2000, pp. 1429, 1440.
Tseng et al., “Code Placement and Replacement Strategies for Wideband CDMA OVSF Code Tree Management,” Globecom '01, IEEE Global Telecommunications Conference, vol. 1 of 6, Nov. 25, 2001, pp. 562-566.
Chen et al., “A Novel Code Assignment Scheme for W-CDMA Systems,” IEEE Vehicular Technology Conference, vol. 2, Oct. 2001, pp. 1182-1186.
Cheng et al., “OVSF Code Channel Assignment for IMT-2000”, IEEE Vehicular Technology Conference Proceedings, 2000 Spring Tokyo, vol. 3, May 2000, pp. 2188-2192.
Minn et al., “Dynamic Assignment for Orthogonal Variable-Spreading-Factor Codes in W-CDMA,” IEEE Selected Areas in Communications Journal, vol. 18, Issue, Aug. 2000, pp. 1429-1440.
Tseng et al., “Code Placement and Replacement Strategies for Wideband CDMA OVSF code Tree Management,” Globecom '01, IEEE Global Telecommunications Conference, vol. 1 of 6, Nov. 25, 2001, pp. 562-566.

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