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US 2002/0054622 A1Published application
Receiver for receiving a spectrum dispersion signal
AssigneeHitachi, Ltd.
InventorsShigeyuki Sudo, Osamu Hasegawa, Toshiya Eguchi
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AssigneeHitachi, Ltd.
InventorsShigeyuki Sudo, Osamu Hasegawa, Toshiya Eguchi
Estimating the term…
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 t1 by means of a low-power timer 51 so that a VC-TCXO 1, a reference signal group generation unit 2 and a receiving unit 3 are turned off and a modem unit 4 is set to a sleep state. Upon resumption of receiving operation, a high-accuracy timer 44 is supplied with a start (d) to require counting of time t3 and a part of a received signal is stored. A PN code phase of stored data is calculated in a PN code phase calculator 46 during a period t3 to obtain an indication value i for a phase deviation. State vectors for short code and long code and further a reception time t4 are calculated on the basis of the indication value i to be set. When the high-accuracy timer 44 counts t3 and produces 0V(d), demodulation operation by a rake demodulation unit 40, a demultiplexing unit 41 and a descrambler unit 42 is started in accordance with the setting and is continued during the reception time t4.
A receiver for receiving a spread spectrum signal and including means for generating a code for despreading, comprising intermittent receiving control in which a suspension period of intermittent receiving operation is managed by first timer means and a phase of spreading code for a received signal is calculated upon resumption of receiving operation, a state value of despreading code generating means after a predetermined time being set on the basis of said calculated value, an elapse of said predetermined time being managed by second timer means started newly upon the resumption of the receiving operation, demodulation operation of a spread signal being resumed after the elapse of said predetermined time, a continuation time of the demodulation operation being adjusted every time on the basis of said calculated value.
A receiver for receiving a spread spectrum signal and including means for generating a code for despreading, comprising:
Dependencies are inferred from the claim text.