Method and apparatus for transmitting and receiving high speed data using code division multiple access channels

• US 7,027,484 B1
• Filed: 07/10/1998
• Issued: 04/11/2006
• Est. Priority Date: 07/10/1998
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tiedemann, Edward G. Jr.
• Primary Examiner(s): WANG, TED M
• Application Number:
  US09/113,770
• Time in Patent Office: 2,832 Days
• Field of Search: 375/295, 375/130, 375/131, 375/219, 375/132, 375/135, 375/140, 375/146, 370/331, 370/335, 370/342, 370/320, 370/441, 370/468, 455/575, 455/436
• US Class Current: 375/146
• CPC Class Codes: H04B 1/692 Hybrid techniques using combinations of two or more spread spectrum techniques
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7087 Carrier synchronisation aspects
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04B 1/7136 Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 7/2628 using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence

Abstract

The present invention describes a spread spectrum communication system wherein the frequency of carriers and the code channels of the carriers or both for transmission to a given remote station user vary in time. This provides for a direct sequence spectrum communications system which changes frequency or code channel according to a predetermined pattern. The code channels and frequencies can be determined in accordance with a deterministic function or based upon a subset of the data to be transmitted. A receiver structure is also described for receiving the same.

Claims

1. An apparatus for transmitting spread spectrum data, comprising:

a modulation means for receiving data and for modulating the received data in accordance with a spread spectrum modulation format;

a scrambling means for scrambling a subset of information bits in the modulated data; and

an upconversion means for receiving the modulated data and for upconverting the modulated data for transmission at a random frequency determined in accordance with a selection signal, wherein the selection signal is determined in accordance with the scrambled subset of information bits.

2. An apparatus for transmitting spread spectrum data, comprising:

a modulation means for receiving data and for modulating the received data in accordance with a code channel selection signal;

a scrambling means for scrambling a subset of information bits of the modulated data; and

an upconversion means for receiving the modulated data and for upconverting the modulated data for transmission at a frequency determined in accordance with a selection signal, wherein the selection signal is determined in accordance with the scrambled subset of information bits.

3. An apparatus for transmitting spread spectrum data, comprising:

a scrambling means for scrambling a first subset of information bits and a second subset of information bits from received data;

a modulation means for modulating the received data in accordance with a code channel selection signal that is determined in accordance with the scrambled first subset of information bits; and

an upconversion means for receiving the modulated data and for upconverting the modulated data for transmission at a frequency determined in accordance with a selection signal that is determined in accordance with the scrambled second subset of information bits.

4. A method for transmitting data, comprising:

modulating the data;

scrambling a subset of information bits of the modulated data;

selecting a carrier frequency in accordance with the modulated, scrambled subset of information bits; and

upconverting the modulated data using the selected carrier frequency.

5. A method of transmitting data, comprising:

scrambling a subset of information bits of the data;

modulating the data in accordance with a code channel selection signal that is determined in accordance with the scrambled subset of information bits; and

upconverting the modulated data using a selected carrier frequency.

6. A computer readable medium embodying a method for transmitting data, the method comprising:

modulating the data;

scrambling a subset of information bits of the modulated data;

selecting a carrier frequency in accordance with the modulated, scrambled subset of information bits; and

upconverting the modulated data using the selected carrier frequency.

7. A computer readable medium embodying a method for transmitting data, the method comprising:

scrambling a subset of information bits of the data;

determining a code channel selection signal in accordance with the scrambled subset of information bits;

modulating the data in accordance with the determined code channel selection signal; and

upconverting the modulated data using a selected carrier frequency.

8. An apparatus for transmitting spread spectrum data, comprising:

a modulator to modulate spread spectrum data having a subset of information bits;

a scrambler to receive a modulated subset of information bits from the modulator and to scramble the modulated subset of information bits to generate scrambled modulated subset of information bits; and

at least one upconverter to upconvert the scrambled modulated subset of information bits at a carrier frequency that changes in accordance with a predetermined pattern, wherein the predetermined pattern is determined based on the scrambled modulated subset of information bits.

9. An apparatus for transmitting spread spectrum data, comprising:

a scrambler to scramble a subset of information bits of spread spectrum data to generate scrambled sub set of information bits;

a control processor to receive the scrambled subset of information bits and to output a code channel selection signal that is determined in accordance with the scrambled subset of information bits; and

a modulator to modulate the spread spectrum data in accordance with the code channel selection signal.

10. A method for transmitting data, comprising:

modulating the data;

scrambling a subset of information bits of the modulated data;

upconverting a carrier frequency that changes in accordance with a predetermined pattern, wherein the predetermined pattern is determined by the scrambled modulated subset of information bits.

11. A transmitter, comprising:

means for scrambling a subset of information bits of data to generate scrambled subset of information bits;

means for receiving the scrambled subset of information bits and outputting a selection signal that is determined in accordance with the scrambled subset of information bits; and

means for modulating the data in accordance with the selection signal.