USE OF ORTHOGONAL OR NEAR ORTHOGONAL CODES IN REVERSE LINK

• US 20090213905A1
• Filed: 04/30/2009
• Published: 08/27/2009
• Est. Priority Date: 07/17/2001
• Status: Active Grant

• Current Assignee: IPR Licensing Incorporated (InterDigital, Inc.)
• Original Assignee: IPR Licensing Incorporated (InterDigital, Inc.)
• Inventors: Alapuranen, Pertti O., Proctor, James A. JR.
• Granted Patent: US 8,259,744 B2
• Time in Patent Office: Days
• US Class Current: 375/141
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7077 Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation
• CPC Class Codes: H04J 13/0022 PN, e.g. Kronecker
• CPC Class Codes: H04J 13/18 Allocation of orthogonal codes
• CPC Class Codes: H04J 3/0635 Clock or time synchronisation in a network timer in protocols H04L69/28
• CPC Class Codes: H04L 7/043 Pseudo-noise [PN] codes variable during transmission synchronisation of spread spectrum receivers H04B1/69
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames

Abstract

An apparatus for use with a shared access communication channel is disclosed. The chipping rate of a first group of terminals is determined. Transmissions on the shared access communication channel are encoded using first pseudorandom noise (PN) code and a phase shift at the first chipping rate and an orthogonal spreading code having a chipping rate less than the first chipping rate. The apparatus may receive a feedback channel assignment and may receive an indication of a change in timing on the assigned feedback channel.

Claims

1. An apparatus for wireless communication, the apparatus comprising:

a receiver configured to receive an indication of a first chipping rate that is used by a first group of terminals; and

a transmitter configured to transmit using a first pseudorandom noise (PN) code and a phase shift at the first chipping rate, and an orthogonal spreading code having a chipping rate less than the first chipping rate.

2. The apparatus of claim 1, wherein the orthogonal spreading code is a Walsh code.

3. The apparatus of claim 1, wherein the orthogonal spreading code uniquely defines a separate logical channel.

4. The apparatus of claim 1, wherein the orthogonal spreading code is a near-orthogonal spreading code.

5. The apparatus of claim 1, wherein the receiver is configured to receive a feedback channel assignment, and to receive a report from a base station on the assigned feedback channel, where the report indicates a change in timing for a future communication.

6. The apparatus of claim 5, wherein the receiver is configured to receive one or more of channel noise information or synchronization information on the assigned feedback channel.

7. The apparatus of claim 1, wherein the chipping rate of the orthogonal spreading code is proportional to a modulation symbol rate of the apparatus.

8. The apparatus of claim 1, wherein the transmitter is configured to perform adaptive modulation.

9. The apparatus of claim 1, wherein the receiver is configured to receive a modulation rate based on a Carrier to Interference ratio (C/I) measurement.

10. The apparatus of claim 1, wherein the receiver is configured to receive a forward error correction rate based on a Carrier to Interference ratio (C/I) measurement.

11. The apparatus of claim 1, wherein the receiver is configured to receive a PN spreading code assignment including a second PN spreading code.

12. The apparatus of claim 1, further configured perform code division multiple access (CDMA) communications.