Hitachi, Ltd.

Samsung Electronics Co., Ltd.

Toshiya Eguchi

Osamu Hasegawa

Shigeyuki Sudo

A receiver for the CDMA system which reduces power consumption during a suspension period of intermittent receiving operation by monitoring a suspension period by a low-power timer so that a VC-TCXO, reference signal group generation and receiving units are turned off and a modem unit is set to a sleep state. Upon resumption of receiving operation, a high-accuracy timer is started to count a time period and part of a received signal is stored. A PN code phase of stored data is calculated during the time period to obtain an indication value for phase deviation. State vectors for short and long codes and a further reception time are calculated based on the indication value. When the high-accuracy timer counts the time period and produces 0V(d), demodulation operation by a rake demodulation, demultiplexing, and descrambler units is started and is continued during the reception time.

Receiver for receiving a spectrum dispersion signal

A receiver for the CDMA system which reduces power consumption during a suspension period of intermittent receiving operation by monitoring a suspension period by a low-power timer so that a VC-TCXO, reference signal group generation and receiving units are turned off and a modem unit is set to a sleep state. Upon resumption of receiving operation, a high-accuracy timer is started to count a time period and part of a received signal is stored. A PN code phase of stored data is calculated during the time period to obtain an indication value for phase deviation. State vectors for short and long codes and a further reception time are calculated based on the indication value. When the high-accuracy timer counts the time period and produces OV(d), demodulation operation by a rake demodulation, demultiplexing, and descrambler units is started and is continued during the reception time.

A receiver for the CDMA system, in order to reduce a power consumption during a suspension period of intermittent receiving operation, monitors a suspension period tby means of a low-power timerso that a VC-TCXOa reference signal group generation unitand a receiving unitare turned off and a modem unitis set to a sleep state. Upon resumption of receiving operation, a high-accuracy timeris supplied with a start (d) to require counting of time tand a part of a received signal is stored. A PN code phase of stored data is calculated in a PN code phase calculatorduring a period tto obtain an indication value i for a phase deviation. State vectors for short code and long code and further a reception time tare calculated on the basis of the indication value i to be set. When the high-accuracy timercounts tand produces 0V(d), demodulation operation by a rake demodulation unita demultiplexing unitand a descrambler unitis started in accordance with the setting and is continued during the reception time t

A receiver for the CDMA system, in order to reduce a power consumption during a suspension period of intermittent receiving operation, monitors a suspension period tby means of a low-power timerso that a VC-TCXOa reference signal group generation unitand a receiving unitare turned off and a modem unitis set to a sleep state. Upon resumption of receiving operation, a high-accuracy timeris supplied with a start (d) to require counting of time tand a part of a received signal is stored. A PN code phase of stored data is calculated in a PN code phase calculatorduring a period tto obtain an indication value i for a phase deviation. State vectors for short code and long code and further a reception time tare calculated on the basis of the indication value i to be set. When the high-accuracy timercounts tand producesV(d), demodulation operation by a rake demodulation unita demultiplexing unitand a descrambler unitis started in accordance with the setting and is continued during the reception time t

A receiver for the CDMA system, in order to reduce a power consumption during a suspension period of intermittent receiving operation, monitors a suspension period t by means of a low-power timer so that a VC-TCXO , a reference signal group generation unit and a receiving unit are turned off and a modem unit is set to a sleep state. Upon resumption of receiving operation, a high-accuracy timer is supplied with a start (d) to require counting of time t and a part of a received signal is stored. A PN code phase of stored data is calculated in a PN code phase calculator during a period t to obtain an indication value i for a phase deviation. State vectors for short code and long code and further a reception time t are calculated on the basis of the indication value i to be set. When the high-accuracy timer counts t and produces 0V(d), demodulation operation by a rake demodulation unit , a demultiplexing unit and a descrambler unit is started in accordance with the setting and is continued during the reception time t

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Kamakura, Japan

Toshiya Eguchi