EP0704987A2
Expired / Lapsed
EP
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Spread spectrum communication terminal apparatus in CDMA cellular telephone system
Assignee: Sony Corp
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Filing: 1995-09-29
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Granted: —
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Expires: 2015-09-29
Abstract
Abstract Plural demodulators (12A), (12B), and (12C) receive a received signal (S1) which was transmitted from a certain base station and propagated via the different propagation paths respectively. Each of the demodulated signals (S3A), (S3B), and (S3C) generates the demodulated signal by examining the correlation between the received signal (S1) and a PN code. The system time managing counter has a count value to be initialized at the timing of the forefront of the spread code in the demodulator when at least one of the plural demodulators starts the demodulation operation after power-on or after resetting. The signal synthesizer (15) synthesizes the demodulated signals, which are adjusted to coincide in timing with each other, from the plural demodulators at the suitable timing provided from the system time managing counter after the initialization and provide an outputs of a synthetic demodulated signal (S4). The control circuit (14) reads the information of the time offset and so on of the PN code to the system time from the sync channel message on the sync channel in the synthetic demodulated signal, so that the system time of the base station is set to the system time managing counter.
Inventors
- 👤 Takehiro c/o Sony Corporation Sugita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 02:23
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/7073; H04B1/7075; H04B1/708; H04B1/70751; H04B1/70752; H04B1/7097; H04B1/711; H04B1/7115; H04B1/7117; H04J; H04J13/00; H04J13/0003
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
163 words
A spread spectrum communication terminal apparatus comprising: a plurality of demodulators for receiving a signal received via different propagation paths after being transmitted from a certain base station and for generating demodulated signals by examining the correlation of said received signal and a pseudo noise code; a system time managing counter for producing a count value to be initialized at the timing of the forefront of the pseudo noise code in said demodulator when at least one of said plurality of demodulators has started the demodulating operation; a signal synthesizer for synthesizing said demodulated signal from said plurality of demodulators at a suitable timing given from said initialized system time managing counter to generate a synthetic demodulated signal; and control means for receiving the synthetic demodulated signal from said signal synthesizer, for extracting timing information from said synthetic demodulated signal, and for setting the system time of said base station to said system time managing counter on the basis of said timing information.
Claim 2
Dependent Claim
49 words
The spread spectrum communication terminal apparatus according to claim 1, wherein said control means is arranged to extract said timing information with respect to the time offset of said pseudo noise code for the system time of said base station from the sync channel in the synthetic demodulated signal.
Claim 3
Dependent Claim
39 words
The spread spectrum communication terminal apparatus according to claim 1, wherein said system time managing counter has means for setting the system time offset by a predetermined time for the timing of the forefront of said pseudo noise code.
Claim 4
Dependent Claim
179 words
A spread spectrum communication terminal apparatus comprising: a plurality of demodulators for receiving a signal which is received via the different propagation paths after it has been transmitted from a certain base station and for generating demodulated signals by examining the correlation of said received signal and the pseudo noise code; a signal synthesizer for synthesizing said demodulated signal to generate an output of a synthetic modulated signal; control means for extracting a time offset, a super-frame number, and a set timing value of the super-frame number of the pseudo noise code from the information included in the sync channel of said synthetic modulated signal; and a system time managing counter having a super-frame counter for counting the super-frame, time offset means for shifting the count timing of said super-frame counter by the predetermined time offset, super-frame number setting means for making the count operation of said super-frame to be continued from the predetermined super-frame number when the count value of said super-frame counter become the counter value determined based on the set timing value of said super-frame number.
Claim 5
Dependent Claim
139 words
The spread spectrum communication terminal apparatus according to claim 4, wherein said time offset means has a time setting means to which a predetermined time offset value is set and a second counter arranged to have a count value advanced in response to the time offset value provided from said time offset means, said super-frame counter being arranged to count carry signals from said second counter, said super-frame number setting means having a number setting device to which the super frame number is set and a comparator for comparing the count value of said super-frame counter with the set timing value of the super-frame number, such that if the count value of said super-frame counter coincides with the set timing value of said super-frame number, said super-frame number in said number setting device is set to the super-frame counter.
Claim 6
Dependent Claim
145 words
A spread spectrum communication terminal apparatus comprising: a plurality of demodulators for receiving a signal received via the different propagation paths after being transmitted from a certain base station and for generating demodulated signals by examining the correlation of said received signal and the pseudo noise code; a signal synthesizer for synthesizing the demodulated signals to generate an output of the synthetic demodulated signal; and a system time managing counter to which the system time of said base station is set; wherein said system time managing counter has a system time adjusting circuit for advancing or delaying the count value by comparing the timing of the specific bit with the timing of the specific bit of each counter which is built in said demodulator, and causing to coincide the timing of said specific bit with the earliest one of the demodulators which are now demodulating.
References Cited (Backward Citations)
No citation records indexed.
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