High-data-rate supplemental channel for CDMA telecommunications system

• US 5,949,814 A
• Filed: 10/13/1998
• Issued: 09/07/1999
• Est. Priority Date: 01/15/1997
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tiedemann, Edward G. Jr., Jou, Yu-Cheun, Odenwalder, Joseph P., Antonio, Franklin P.
• Primary Examiner(s): Bocure, Tesfaldet
• Application Number:
  US09/170,903
• Time in Patent Office: 329 Days
• Field of Search: 375/200, 375/260, 375/377, 375/206, 375/295, 375/298, 375/308, 375/261, 375/279, 375/280, 370/206, 370/342, 370/335, 370/441, 370/209
• US Class Current: 375/140
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 7/264 for data rate control
• CPC Class Codes: H04J 13/0003 Code application, i.e. aspects relating to how codes are applied to form multiplexed channels
• CPC Class Codes: H04J 13/0048 Walsh
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0059 Convolutional codes
• CPC Class Codes: H04L 1/0067 Rate matching H04L1/0013 and H04L1/08 take precedence
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint

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.

Claims

1. A method for transmitting a high data rate channel in conjunction with a set of medium rate communications 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 said set of high data rate channel over said in-phase set of medium rate channels; and

d) transmitting said high-rate communication over a subset of said quadrature-phase set of medium rate channels.

2. The method as set forth in claim 1 wherein said subset is comprised of a set of evenly space Walsh channels.

3. The method of claim 1 wherein steps a) is comprised of the step of:

generating said set of channels by modulating said set of medium rate communications with a set of long channel codes;

summing said set of channels yielding summed data;

generating in-phase spread data in response to said summed data and an in-phase spreading code;

generating quadrature-phase spread data in response to said summed data and a quadrature-phase spreading code;

modulating said in-phase spread data with an in-phase carrier yielding an in-phase signal;

modulating said quadrature-phase spread data with a quadrature-phase carrier yielding a quadrature-phase signal; and

summing said in-phase signal and said quadrature phase signal.

4. The method of claim 1 wherein steps b) is comprised of the step of:

generating said high-rate channel by modulating said high-rate communication with a short channel code;

generating high-rate in-phase spread data in response to said high-rate channel and said in-phase spreading code;

generating high-rate quadrature-phase spread data in response to said high-rate data and a quadrature-phase spreading code;

modulating said high-rate in-phase spread data with an quadrature-phase carrier yielding an high-rate quadrature-phase signal;

modulating an inverted instance of said high-rate quadrature-phase spread data with an in-phase-phase carrier yielding a high-rate in-phase-phase signal; and

summing said high-rate in-phase signal and said high-rate quadrature phase signal.

5. The method of claim 1 wherein steps a) and b) are comprised of the steps of:

a.1) modulating said set of medium rate communications using a set of channel codes;

a.2) summing said set of channel codes yielding summed data;

a.3) modulating said summed data with a first set of carrier sinusoids;

b.1) modulating said high-rate channel with a short channel code yielding said high-rate channel; and

b.2) modulating said high-rate channel with a second set of carrier sinusoids that are 90°

out of phase with said first set of carrier sinusoids.

6. The method as set forth in claim 5 wherein said short channel code is comprised of two Walsh symbols and said long channel codes are each comprised of sixty-four Walsh symbols.