Source: http://www.google.com/patents/US6775317?dq=5958006
Timestamp: 2016-06-30 21:41:13
Document Index: 281563681

Matched Legal Cases: ['art 1', 'art 1', 'art 1', 'art 2', 'art 2', 'art 2']

Patent US6775317 - Method for spread spectrum communications and transmitter and receiver of ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA transmitter of a base station stops a spread modulation so as to transmit a free-line signal and a call-in signal to a mobile station in a wait state. A receiver of a mobile station which is in the wait state stops a despread modulation so as to receive the free-line signal and the call-in signal which...http://www.google.com/patents/US6775317?utm_source=gb-gplus-sharePatent US6775317 - Method for spread spectrum communications and transmitter and receiver of the sameAdvanced Patent SearchPublication numberUS6775317 B1Publication typeGrantApplication numberUS 09/506,535Publication dateAug 10, 2004Filing dateFeb 17, 2000Priority dateFeb 19, 1999Fee statusLapsedPublication number09506535, 506535, US 6775317 B1, US 6775317B1, US-B1-6775317, US6775317 B1, US6775317B1InventorsYasuhiro YokotaOriginal AssigneeFujitsu LimitedExport CitationBiBTeX, EndNote, RefManPatent Citations (21), Referenced by (4), Classifications (11), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetMethod for spread spectrum communications and transmitter and receiver of the same
US 6775317 B1Abstract
A transmitter of a base station stops a spread modulation so as to transmit a free-line signal and a call-in signal to a mobile station in a wait state. A receiver of a mobile station which is in the wait state stops a despread modulation so as to receive the free-line signal and the call-in signal which are from the base station. The transmitter modulates, spreads, and then transmits and the receiver receives and then despreads and demodulates a control signal for connecting a line after transmitting and receiving the call-in signal are completed, a control signal for connecting the line when a call-out request is sent from the mobile station, and a talk signal and a talk completion control signal which are transmitted and received through the line.
P r=(C L+ C pd)�f�V cc 2 (1)
where CL denotes a load capacity, Cpd denotes an internal equivalent capacity, f denotes an operating frequency, and Vcc denotes a supply voltage.
With respect to the consumed power, for example, if operating at 3 MHz per gate consumes 5 V and 0.4 mA (2 mW), then a circuit block including 1000 gates will consumes 400 mA. In a case in which an intermittence in which a ratio of receiving operation “ON” to receiving operation “OFF” is 1:9, a consumed current is 40 mA. On the other hand, an analog amplifier can be operated by 1 V, 1 mA (1 mW) even in a case of a high frequency of 150 MHz.
It is a general object of the present invention to provide a method for spread spectrum communications and a transmitter and receiver of the method, in which the above disadvantages are eliminated.
FIG. 7 is a block diagram of a transmitter used for spread spectrum communications according to the present invention. FIG. 8 is a block diagram of a receiver used for spread spectrum communications according to the present invention.
With respect to the transmitter, when the spread control signal is “1”, an output of the OR gate becomes a fixed value “1”, and the diodes D1 and D2 become continuous all the time. As a result, an FM narrowband signal is inputted into the spread modulating part 1-3 and then outputted therefrom without being spread.
When the spread control signal is “0”, the output of the OR gate varies with the spread code. In a case in which the output of the OR gate is “1”, the diodes D1 and D2 become continuous, and the FM narrowband signal is inputted into the spread modulating part 1-3 and then outputted therefrom without a phase inversion, whereas in a case in which the output of the OR gate is “0”, the diodes D3 and D4 become continuous, and the FM narrowband signal is inputted into the spread modulating part 1-3 and then outputted therefrom with the phase inversion. Thus, according to a string of the data of the spread code, the spread modulation is performed by inverting or non-inverting the phase of the inputted signal.
Similarly, with respect to a receiving side, when the despread control signal is “1”, an output of the OR gate becomes the fixed value “1”, and the diodes D1 and D2 become continuous all the time. As a result, the FM narrowband signal is inputted into the despread modulating part 2-3 and then outputted therefrom without being despread.
When the despread control signal is ”0”, the output of the OR gate varies with the despread code. In a case in which the output of the OR gate is “1”, the diodes D1 and D2 become continuous, and the FM narrowband signal is inputted into the despread modulating part 2-3 and then outputted herefrom without a phase inversion, whereas in a case in which the output of the OR gate is “0”, the diodes D3 and D4 become continuous, and the FM narrowband signal is inputted into the despread modulating part 2-3 and then outputted therefrom with the phase inversion. Thus, according to a string of the data of the despread code, the despread modulation is performed by inverting or non-inverting the phase of the input spread signal.
It is clear from the data of FIG. 13 that the consumed current and consumed power of the digital portion occupy the majority of the overall consumed currents and consumed powers, but become nearly “0”, when the despread modulation is stopped. For this reason, the total consumed power of the intermittent operations was 127 mW, whereas the total consumed power of the intermittent operations with despread stops was 6.5 mW. In other words, the consumed power was drastically reduced nearly to one twentieth.
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