Patent EP0827296A2 successfully refreshed from Google Patents.
EP0827296A2
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EP
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CDMA communication system
Assignee: NEC Corp
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Filing: 1997-08-26
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Granted: —
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Expires: 2017-08-26
Abstract
Abstract In a CDMA communication system, a base station includes a spreader 11 for spreading a frequency of a standby control signal by using a short code, a differential coder 12 for differential-coding the spread standby control signal and adders 13a and 13b for adding the differential-coded signal to an I channel signal and a Q channel signal, respectively, and a terminal station includes a differencial detector 14 for differencial-detecting a receiving signal and a matched filter 15 for inverse-spreading a differencial-detected baseband signal, wherein a complete intermittent operation of the terminal station in a standby state is realized and a power consumption of the terminal station is reduced by transmitting the standby control signal containing an information indicative of the terminal station and an intermittent interval from the base station to the terminal station. <IMAGE>
Inventors
- 👤 Masaki Ichihara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 13:49
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2628; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
69 words
A CDMA communication system for performing a CDMA communication between
a base station and a terminal station, comprising a CDMA channel for transmitting a
predetermined signal, a standby control channel for transmitting a standby control
signal for controlling an intermittent receiving operation of said terminal station during
the standby period such that said base station controls the intermittent receiving
operation of said terminal station during the standby period thereof.
Claim 2
Dependent Claim
42 words
A CDMA communication system as claimed in claim 1, wherein said base station
comprises means for modulating the standby control signal according to a modulation
scheme which is different from that of the predetermined signal and transmitting the
modulated standby control signal.
Claim 3
Dependent Claim
37 words
A CDMA communication system as claimed in claim 1 or 2, wherein said terminal
station comprises means for demodulating the standby control signal according to a
demodulation scheme which is different from that of the predetermined signal.
Claim 4
Dependent Claim
79 words
A CDMA communication system as claimed in any of claims 1 to 3, wherein said
base station transmits an information indicative of an identification number of said
terminal station and an intermittent receiving interval thereof together with the standby
control signal and said terminal station stops its receiving operation for a time indicated
by the intermittent receiving interval contained in the information of the standby
control signal when the identification number thereof is contained in the standby
control signal.
Claim 5
Dependent Claim
26 words
A CDMA communication system as claimed in any of claims 1 to 4, wherein the
standby control signal is transmitted by using a split phase code.
Claim 6
Independent Claim
98 words
A system as claimed in any one of claims 1 to 5, wherein said base station
comprises first spreader means for spreading a frequency of the predetermined signal
by using a first spread code, first modulator means for modulating the predetermined
signal frequency-spread by said rust spreader means, second spreader means for
spreading a frequency of the standby control signal by using a second spread code,
second modulator means for modulating the standby control signal frequency-spread
by said second spreader means and transmitter means for transmitting outputs of said
first and second modulator means to said terminal station.
Claim 7
Dependent Claim
19 words
A CDMA communication system as claimed in claim 6, wherein said second
modulator means comprises a differential coding circuit.
Claim 8
Dependent Claim
19 words
A CDMA communication system as claimed in claim 6, wherein said second
modulator means includes said first modulation means.
Claim 9
Independent Claim
132 words
A system as claimed in any of claims 1 to 8, wherein said terminal
station comprises receiver means for receiving the signal transmitted from said base
station, first demodulator means for demodulating the predetermined signal of the
signal received by said receiver means, first inverse-spreader means for inverse-spreading
the frequency of the predetermined signal demodulated by said first
demodulator means by using a first inverse spread code, first decoder means for
decoding the predetermined signal inverse-spread by said first inverse spreader means,
second demodulator means for demodulating the standby control signal of the signal
received by said receiver means, second inverse spreader means for inverse-spreading
the standby control signal demodulated by said second demodulator means and second
decoder means for decoding the standby control signal inverse-spread by said second
inverse spreader means.
Claim 10
Dependent Claim
40 words
A CDMA communication system as claimed in claim 9, wherein, in the standby
state of said terminal station, operations of said first demodulator means, said first
inverse spreader means and said first decoder means of said terminal station are
stopped.
Claim 11
Dependent Claim
19 words
A CDMA communication system as claimed in claim 10, wherein said second
demodulator means comprises a differencial detector circuit.
Claim 12
Dependent Claim
19 words
A CDMA communication system as claimed in claim 10, wherein said second
demodulator means comprises a differencial detector circuit.
Claim 13
Dependent Claim
21 words
A system as claimed in claim 9, 10, 11, or 12, wherein said second
inverse spreader means comprises a matched filter.
Claim 14
Dependent Claim
19 words
A CDMA communication system as claimed in claim 13, wherein said matched
filter is constructed with a SAW device.
References Cited (Backward Citations)
No citation records indexed.
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