Method and apparatus for creating a composite waveform
First Claim
1. A method of digitally combining channel information in a direct sequence code division multiple access (DS-CDMA) communication system, comprising:
- (a) channel coding a plurality of input digital information signals;
(b) communicating the plurality channel coded input digital information signals to a digital combiner;
(c) digitally combining the plurality of channel coded input digital information signals with the digital combiner;
(d) M-ary phase shift keying the digitally combined input digital information signal; and
(e) baseband spectrally shaping the M-ary phase shift keyed digital information signal to limit the bandwidth of a downlink transmission signal.
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Accused Products
Abstract
A method and apparatus is provided for creating a composite waveform. This composite waveform is created by coding a plurality of input digital information signals. Subsequently, the plurality of coded input digital information signals are communicated over a communication medium to a digital combiner. The digital combiner combines the plurality of coded input digital information signals. Finally, the digitally combined information signal is spectrally shaped to form a composite waveform. These composite waveform creation principals may be applied to digitally encoded voice subbands in a subband coding system as well as channel information in a direct sequence code division multiple access (DS-CDMA) communication system transmitter.
60 Citations
25 Claims
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1. A method of digitally combining channel information in a direct sequence code division multiple access (DS-CDMA) communication system, comprising:
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(a) channel coding a plurality of input digital information signals; (b) communicating the plurality channel coded input digital information signals to a digital combiner; (c) digitally combining the plurality of channel coded input digital information signals with the digital combiner; (d) M-ary phase shift keying the digitally combined input digital information signal; and (e) baseband spectrally shaping the M-ary phase shift keyed digital information signal to limit the bandwidth of a downlink transmission signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of digitally combining channel information in a direct sequence code division multiple access (DS-CDMA) communication system, comprising:
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(a) channel coding a plurality of input digital information signals; (b) splitting each of the plurality of channel coded digital information signals into sector components for each sector of a cell; (c) converting each sector component of the plurality of channel coded digital information signals from a parallel to a serial signal; (d) communicating the sector components of the plurality channel coded input digital information signals to a digital combiner; (e) digitally combining by sector the sector components of the plurality of channel coded input digital information signals with the digital combiner through a serial addition process; (f) converting by sector the digitally combined channel coded digital information signal from a serial to a parallel signal; (g) M-ary phase shift keying by sector the digitally combined input digital information signal; and (h) baseband spectrally shaping by sector the M-ary phase shift keyed digital information signal to limit the bandwidth of a downlink transmission signal. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A direct sequence code division multiple access (DS-CDMA) transmitter which digitally combines channel information, comprising:
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(a) a first and a second channel means for channel coding a first and a second input digital information signal, respectively; (b) combiner means, operatively coupled to the first and the second channel means, for digitally combining the first and the second channel coded input digital information signals; (c) modulation means, operatively coupled the combiner means, for M-ary phase shift keying the digitally combined input digital information signal; and (d) filter means, operatively coupled to the modulation means, for baseband spectrally shaping the M-ary phase shift keyed digital information signal to limit the bandwidth of a downlink transmission signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. A direct sequence code division multiple access (DS-CDMA) transmitter which digitally combines channel information, comprising:
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(a) a first and a second channel encoder for channel coding a first and a second input digital information signal, respectively, each channel encoder comprising a splitter for splitting the channel coded digital information signal into sector components for each sector of a cell, each channel encoder further comprising a converter for converting the sector components of the channel coded digital information signal from a parallel to a serial signal; (b) a combiner, operatively coupled to the first and the second channel encoder, for separately serially adding together each sector component of the first and the second channel coded input digital information signals, the combiner comprising a converter for converting each sector component of the digitally combined channel coded digital information signal from a serial to a parallel signal; (c) a modulator, operatively coupled to the combiner, for separately M-ary phase shift keying each sector component of the digitally combined input digital information signal; and (d) a filter, operatively coupled to the modulator, for separately baseband spectrally shaping each sector component of the M-ary phase shift keyed digital information signal to limit the bandwidth of a downlink transmission signal.
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Specification