Patent EA-001746-B1 (EA)
Title: High-data-rate supplemental channel for cdma telecommunication system
Inventor: ODENWALDER JOSEPH P
IPC: H04B1/707
Filed: 1997-12-19
Abstract: 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. 2. The telecommunications system as set forth in claim 1 wherein said first set of medium rate channels is defined by a first set of channel codes, and said second set of medium rate channels is defined by a second set of channel codes, and the high-rate communication is transmitted over an evenly distributed subset of said second set of channel codes. 3. The telecommunications system as set forth in claim 1 wherein:  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. 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. 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 sixtyfour symbol Walsh codes.  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.  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-hase channel.  8. The telecommunications system as set forth in claim 3 wherein said first signal processing means further comprises: 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. 9. The telecommunications system as set forth in claim 8 further comprising: 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. 10. The telecommunications system of claim 9 further comprising: in-phase carrier generator for modulating said in-phase term; and quadrature phase carrier generator for modulating said quadrature-phase term. 11. A method for transmitting data using a radio frequency signal comprising the steps of: 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. 12. The method as set forth in claim 11 further comprising the steps of: 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. 13. The method as set forth in claim 12 further comprising the steps of: 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. 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. 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. 16. The method as set forth in claim 11 wherein said short Walsh code occupies a set of evenly spaced long Walsh codes. 17. The method as set forth in claim 10 wherein said long Walsh codes are comprised of sixty-four Walsh symbols. 18. A telecommunications system for transmitting data over code division multiple access radio frequency signals comprising: 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. 19. The telecommunications system of claim 18 wherein said first channel generation system is comprised of a set of long channel code modulators. 20. The telecommunications system of claim 19 wherein said second channel generation system is comprised of a short channel code modulator. 21. The telecommunications system as set forth in claim 18 wherein said second channel generation system comprises a means for transmitting data via a set of evenly distributed long code channels. 22. A method for operating a multichannel communication system using direct sequence spread spectrum signal processing comprising the steps of: a) generating a complex data source having a multichannel term and a high-rate term, comprising the steps of: a.1) generating a set of medium rate channels in response to a set of medium rate data sources and a set of long channel codes; a.2) generating said multichannel term by summing said set of medium rate channels; and a.3) generating a high-rate channel in response to a high-rate data source and a short channel code; b) generating a complex spreading code having an in-phase term and quadrature-phase term; c) multiplying said complex data source and said complex spreading code yielding a real term and an imaginary term; d) modulating said real term with an in-phase carrier; and e) modulating said imaginary term with a quadrature-phase carrier. 23. The method as set forth in claim 22 wherein step a.1) is comprised of the step of modulating said set of medium rate data sources with said set of channel codes. 24. The method as set forth in claim 22 further comprising the step of adjusting the amplitude of said set of medium rate channels and said high-rate channel. 25. The method as set forth in claim 22 wherein step a.3) is comprised of the step of transmitting said high-rate data over a set of medium rate channels. 26. The method as set forth in claim 24 wherein step a.3) further comprises the steps of: generating a second set of medium rate channels in response to a second set of medium rate channels and a second set of long channel codes; and summing said second set of medium rate channels with said high-rate channel. 27. A direct sequence spread spectrum communications system comprising: first long channel code modulator for generating first channel data in response to first user data; first short channel code modulator for generating second channel data in response to second user data; first in-phase spreader for generating first in-phase data in response to said first channel data; second in-phase spreader for generating second in-phase data in response to said second channel data; first quadrature-phase spreader for generating first quadrature-phase data in response to said first user data; second quadrature-phase spreader for generating second quadrature-phase data in response to second user data; first summer for generating an in-phase term in response to said first in-phase data and an inverted instance of said second quadrature-phase user data; second summer for generating a quadrature-phase term in response to said first quadrature-phase data and said second in-phase data; in-phase carrier sinusoid modulator for generating an in-phase signal in response to said first term; quadrature-phase carrier sinusoid modulator for generating a quadrature-phase signal in response to said second term; and summer for summing said in-phase signal and said quadrature-phase signal. 28. The system as set forth in claim 27 wherein said first channel has a lower data rate than said second channel. 29. A method for transmitting high rate data in conjunction with a medium rate communication using code division multiple access processing comprising the steps of: a) generating an in-phase set of medium rate channels; b) generating a quadrature-phase set of medium rate channels; c) transmitting a first set of high rate data over said in-phase set of medium rate channels; and d) transmitting a second set of high rate data over a subset of said quadrature-phase set of medium rate channels. 30. The method as set forth in claim 29 wherein said subset is comprised of a set of evenly space Walsh channels. 31. The metho