High-data-rate supplemental channel for CDMA telecommunications system
First Claim
1. A method for operating a multichannel communication system using direct sequence spread spectrum signal processing comprising:
- generating a complex data source having a multichannel term and a high-rate term;
generating a set of medium rate channels in response to a set of medium rate data sources and a set of long channel codes;
generating said multichannel term by summing said set of medium rate channels;
generating a high-rate channel in response to a high-rate data source and a short channel code;
generating a complex spreading code having an in-phase term and quadrature-phase term;
complex multiplying said complex data source and said complex spreading code yielding a real term and an imaginary term;
modulating said real term with an in-phase carrier; and
modulating said imaginary term with a quadrature-phase carrier.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
14 Claims
-
1. A method for operating a multichannel communication system using direct sequence spread spectrum signal processing comprising:
-
generating a complex data source having a multichannel term and a high-rate term;
generating a set of medium rate channels in response to a set of medium rate data sources and a set of long channel codes;
generating said multichannel term by summing said set of medium rate channels;
generating a high-rate channel in response to a high-rate data source and a short channel code;
generating a complex spreading code having an in-phase term and quadrature-phase term;
complex multiplying said complex data source and said complex spreading code yielding a real term and an imaginary term;
modulating said real term with an in-phase carrier; and
modulating said imaginary term with a quadrature-phase carrier. - View Dependent Claims (2, 3, 4, 5, 12)
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.
-
-
12. The apparatus in accordance with claim 1 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.
-
6. 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 a n 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. - View Dependent Claims (7)
-
-
8. An apparatus for conducting a high-rate communication in conjunction with a set of medium rate communications using direct sequence spread spectrum 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. - View Dependent Claims (9, 10, 11, 13)
third signal processing means for transmitting a second set of medium communications using another subset of said second set of medium rate channels.
-
-
11. The apparatus in accordance with claim 8 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.
-
-
13. The apparatus in accordance with claim 11 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.
-
-
14. An apparatus for transmitting data using direct sequence spread spectrum signal processing, 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, wherein said second channel generation system comprises a means for transmitting data via a set of evenly distributed long code channels.
-
Specification