High-data-rate supplemental channel for CDMA telecommunications system
First Claim
1. A telecommunications system for conducting a high-rate communication in conjunction with a set of medium rate communications using code division multiple access radio frequency signal processing comprising:
- first signal processing means for transmitting the set of medium rate communications over a first set of medium rate channels in a radio frequency bandwidth; and
second signal processing means for transmitting the high-rate communication over a second set of medium rate channels in said radio frequency bandwidth, wherein said second set of medium rate channels is orthogonal to said first set of medium rate channels.
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Abstract
A novel and improved method for implementing a high-transmission-rate over-the-air interface is described. A transmit system provides an in-phase channel set and a quadrature-phase channel set. The in-phase channel set is used to provide a complete set of orthogonal medium rate control and traffic channels. The quadrature-phase channel set is used to provide a high-rate supplemental channel and an extended set of medium rate channels that are orthogonal to each other and the original medium rate channels. The high-rate supplemental channel is generated over a set of medium rate channels using a short channel code. The medium rate channel are generated using a set of long channel codes.
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Citations
21 Claims
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1. A telecommunications system for conducting a high-rate communication in conjunction with a set of medium rate communications using code division multiple access radio frequency signal processing comprising:
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first signal processing means for transmitting the set of medium rate communications over a first set of medium rate channels in a radio frequency bandwidth; and
second signal processing means for transmitting the high-rate communication over a second set of medium rate channels in said radio frequency bandwidth, wherein said second set of medium rate channels is orthogonal to said first set of medium rate channels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 17)
said first signal processing means is further for generating said set of medium rate channels using a corresponding set of long channel codes; and
said second signal processing means is further for generating a high-rate channel with a short channel code.
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4. The telecommunications system as set forth in claim 3 wherein said high-rate communication is comprised of a set of high-rate code symbols, and each high-rate code symbol is modulated with an instance of said short channel code.
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5. The telecommunications system as set forth in claim 1 wherein set first set of channel codes and set second set of channel codes are sixty-four symbol Walsh codes.
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6. The telecommunications system as set forth in claim 2 further comprising:
third signal processing means for transmitting a second set of medium communications using another subset of said second set of medium rate channels.
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7. The telecommunications system as set forth in claim 1 wherein said first set of medium rate channels are transmitted in an in-phase channel and said second set of medium rate channels are transmitted in a quadrature-phase channel.
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8. The telecommunications system as set forth in claim 3 wherein said first signal processing means further comprises:
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summer for generating summed data in response to said first set of medium rate channels;
first spreader means for generating first spread data in response to said summed data; and
second spreader means for generating second spread data in response to said high-rate channel.
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9. The telecommunications system as set forth in claim 3 further comprising:
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first in-phase spreader means for generating first in-phase spread data in response to said summed data;
first quadrature-phase spreader means for generating first quadrature-phase spread data in response to said high-rate channel;
second in-phase spreader means for generating second in-phase spread data in response to said high-rate channel;
second quadrature-phase spreader means for generating second quadrature-phase spread data in response to said high-rate channel; and
first summer means for generating an in-phase term in response to said first in-phase spread data and a negative instance of said second quadrature-phase spread data; and
second summer means for generating an quadrature-phase term in response to said first quadrature-phase spread data and said second in-phase spread data.
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10. The telecommunications system of claim 9 further comprising:
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in-phase carrier generator for modulating said in-phase term; and
quadrature phase carrier generator for modulating said quadrature-phase term.
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15. The method as set forth in claim 10 wherein said set of channels includes a pilot channel, a synchronization channel and a traffic channel.
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17. The method as set forth in claim 10 wherein said long Walsh codes are comprised of sixty-four Walsh symbols.
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11. A method for transmitting data using a radio frequency signal comprising the steps of:
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a) generating a set of channels using a set of long Walsh codes;
b) generating a high-rate channel using a short Walsh code;
c) transmitting said set of channels via a first carrier; and
d) transmitting said high-rate channel via a second carrier that is orthogonal to said first carrier. - View Dependent Claims (12, 13, 14, 16)
modulating a first instance of said set of channels with an in-phase pseudorandom noise code and an in-phase carrier;
modulating a second instance of said set of channels with a quadrature-phase pseudorandom noise code and a quadrature-phase carrier; and
summing said first instance of said set of channels with said second instance of said set of channels.
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13. The method as set forth in claim 12 further comprising the steps of:
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modulating a first instance of said high-rate channel with an in-phase pseudorandom noise code and an in-phase carrier;
modulating a second instance of said high-rate channel with a quadrature-phase pseudorandom noise code and a quadrature-phase carrier;
inverting said second instance of said high-rate channel; and
summing said first instance of said high-rate channel with said second instance of said high-rate channel.
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14. The method as set forth in claim 11 further comprising the step of transmitting pilot data on one channel from said set of channels.
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16. The method as set forth in claim 11 wherein said short code occupies a set of evenly spaced long Walsh codes.
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18. A telecommunications system for transmitting data over code division multiple access radio frequency signals comprising:
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first channel generation system for generating a set of medium rate channels; and
second channel generation system for generating a high speed channel that is orthogonal to the set of medium rate channels. - View Dependent Claims (19, 20, 21)
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Specification