Mobile communication system capable of transmitting and receiving a radio signal obtained by TDMA and CDMA without interference
First Claim
1. A mobile station for use in a radio communication system to produce a radio output signal, said mobile station comprising a transmitter operable in response to a sequence of transmission signals which is divisible into a succession of frames and which has a predetermined rate, said transmitter comprising:
- rate converting means supplied with said transmission signal sequence for successively rate converting said transmission signal sequence into a sequence of rate converted signals which has a second rate higher than said first rate and which lasts for a time slot shorter than each of said frames;
spread code producing means producing a preselected spread code which is assigned to said transmitter and which is divided into a plurality of chips;
code division multiple access means supplied with said preselected spread code and said rate converted signal sequence for carrying out code division multiple access operation of said rate converted signal sequence in accordance with said preselected spread code to produce a sequence of spread signals which is related to said preselected spread code; and
means producing said spread signal sequence as said radio output signal by allocating said spread signal sequence to at least one specific time slot predetermined for said transmitter.
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Accused Products
Abstract
In a communication system from a mobile station to a base station, a transmitter of the mobile station subjects a sequence of transmission signals to both of time division multiple access (TDMA) and code division multiple access (CDMA) to produce a radio output signal located in a time slot of a frame. The radio output signal obtained by the TDMA and CDMA is filtered or inversely spread to remove interference and noise from the radio output signal by the use of an adaptive filter which has taps controlled by an adaptive controller.
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Citations
22 Claims
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1. A mobile station for use in a radio communication system to produce a radio output signal, said mobile station comprising a transmitter operable in response to a sequence of transmission signals which is divisible into a succession of frames and which has a predetermined rate, said transmitter comprising:
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rate converting means supplied with said transmission signal sequence for successively rate converting said transmission signal sequence into a sequence of rate converted signals which has a second rate higher than said first rate and which lasts for a time slot shorter than each of said frames; spread code producing means producing a preselected spread code which is assigned to said transmitter and which is divided into a plurality of chips; code division multiple access means supplied with said preselected spread code and said rate converted signal sequence for carrying out code division multiple access operation of said rate converted signal sequence in accordance with said preselected spread code to produce a sequence of spread signals which is related to said preselected spread code; and means producing said spread signal sequence as said radio output signal by allocating said spread signal sequence to at least one specific time slot predetermined for said transmitter. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A communication system comprising a transmitter and a receiver, said transmitter being operable in response to a sequence of transmission signals to produce a radio output signal, said transmission signal sequence being divisible into a succession of frames and having a first rate, said transmitter comprising:
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rate converting means supplied with said transmission signal sequence for successively rate converting said transmission signal sequence into a sequence of rate converted signals which has a second rate higher than said first rate and which lasts for a time slot shorter than each of said frames; spread code producing means producing a preselected spread code assigned to said transmitter and divided into a plurality of chips produced at a predetermined chip rate; code division multiple access means supplied with said preselected spread code and said rate converted signal sequence for carrying out code division multiple access operation of said rate converted signal sequence in accordance with said preselected spread code to produce a sequence of spread signals which is related to said preselected spread code; and means for producing said spread signal sequence as said radio output signal by allocating said spread signal sequence to at least one specific time slot predetermined for said transmitter. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A receiver for use in a radio communication system to produce a sequence of reception output signals in response to a radio input signal which is divisible into a succession of frames and which conveys a spread signal sequence in a predetermined time slot formed by dividing each frame, said receiver comprising:
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demodulating means being provided with said radio input signal for demodulating said radio input signal into a sequence of baseband signals concerned with said spread signal sequence; adaptive filter means, which is coupled to said demodulating means and which has a plurality of taps for adaptively filtering said baseband signal sequence to produce a sequence of reproduced signals by adaptively controlling said taps; and output means producing said reproducing signal sequence as said reception output signal sequence. - View Dependent Claims (21, 22)
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Specification