High speed data transmission using expanded bit durations in multiple parallel coded data streams
DC CAFC
First Claim
Patent Images
1. A method for transmitting digital data in a wireless communication environment comprising:
- dividing an incoming stream of serial data bits having a first bit duration (Tb) into a plurality (K) of parallel data bit streams;
expanding by K times the bit duration of the incoming data so that the resulting symbol duration in said parallel data streams equals KTb ;
modulating said expanded parallel data streams with modulating sequences, each said modulating sequence having a processing gain N, having a sequence period equal to the symbol duration KTb of said expanded data streams, and having N binary chips within each period so that each chip has a chip duration of Tc =KTb /N, wherein K and N are integers and N>
K; and
summing the modulated parallel data streams for transmission.
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Accused Products
Abstract
High-rate bit transmitted data is serial to parallel converted into low-rate bit streams in a similar fashion to multicarrier or multitone modulation. However, in contrast to the multicarrier method, each low-rate bit stream is modulated using direct-sequence spread-spectrum. By selecting the processing gain properly the total required bandwidth will be of the same order as the original high-rate data stream, thereby gaining the inherent benefit of multipath rejection without expanding the bandwidth of the original high-rate stream.
101 Citations
15 Claims
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1. A method for transmitting digital data in a wireless communication environment comprising:
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dividing an incoming stream of serial data bits having a first bit duration (Tb) into a plurality (K) of parallel data bit streams; expanding by K times the bit duration of the incoming data so that the resulting symbol duration in said parallel data streams equals KTb ; modulating said expanded parallel data streams with modulating sequences, each said modulating sequence having a processing gain N, having a sequence period equal to the symbol duration KTb of said expanded data streams, and having N binary chips within each period so that each chip has a chip duration of Tc =KTb /N, wherein K and N are integers and N>
K; andsumming the modulated parallel data streams for transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for transmitting digital data in a wireless communication environment comprising:
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a serial to parallel converter for dividing an incoming stream of serial data bits having a first bit duration (Tb) into a plurality (K) of parallel data bit streams; means for expanding by K times the bit duration of the incoming data so that the resulting symbol duration in said parallel data streams equals KTb ; a modulator for modulating said expanded parallel data streams with modulating sequences, each said modulating sequence having a processing gain N, having a sequence period equal to the symbol duration KTb of said expanded data streams, and having N binary chips within each period so that each chip has a chip duration of Tc =KTb /N, wherein K and N are integers and N>
K; anda summing device for summing the modulated parallel data streams for transmission. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification
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Litigation Data
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Current AssigneeIntellectual Ventures I LLC (Intellectual Ventures LLC)
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Original AssigneeHong Kong University of Science and Technology
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InventorsLetaief, Khaled Ben, Murch, Ross D., Chuang, Justin C-I
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Primary Examiner(s)VO, DON NGUYEN
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Application NumberUS08/531,012Time in Patent Office1,469 DaysField of Search375/206, 375/260, 375/267, 370/203, 370/208, 370/209, 370/335, 370/342, 370/441, 370/479US Class Current375/146CPC Class CodesH04B 1/707 using direct sequence modul...H04B 7/264 for data rate controlH04W 52/42 in systems with time, space...
