Lucent Technologies Inc.

National Semiconductor Corporation

Yogendra Champaklal Shah

Sharad Deepak Sambhwani

Krishna Balachandran

Kiran Meghashyam Rege

Kirk K Chang

Karim Nassiri Toussi

Abdulkadir Dinc

Reza Aghazadeh-Alavi

Zhendong Cao

In one embodiment, the present invention is a method for conserving power supplied to a linear feedback shift register (LFSR) long code (LC) generator, the method including steps of operating the LC generator during pre-assigned time slots; shutting off the LC generator during standby periods between the pre-assigned time slots; and priming starting states of the LC generator for synchronization with pre-assigned time slots following a standby period. This embodiment of the present invention enables power to be removed from the LFSR LC generator as well as the LFSR clock. Because the accuracy of the LFSR clock is usually derived from a system master transistor-controlled crystal oscillator (TCXO), and because the LFSR clock operates at a relatively high rate, the TCXO can also be powered down to conserve power. A low frequency, low power clock source can then be used instead of the higher powered clock source and TCXO to maintain operation of the mobile during the mobile sleep state.

Low power long code synchronization scheme for sleep mode operation of CDMA systems

Demodulator assignment logic is provided that confirms the presence and quality of a multipath before assigning a parallel demodulator to that multipath. Multipath presence and quality are confirmed when at least two power measurements of a multipath at least equal a selectable power threshold. Before permitting demodulated data from an assigned demodulator to be processed, demodulator assignment logic further reconfirms the presence and quality of a multipath via another more reliable power measurement that at least equals another selectable power threshold.

Apparatus and methods for improving the assignment of parallel demodulators to multipaths of wireless signals

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Morganville, NJ, United States of America

Yogendra Champaklal Shah