Patent Number: 7,133,353

Title: CDMA system using quasi-orthogonal codes

Abstract: A CDMA communication system uses a set of quasi-orthogonal codes to supplement the standard set of Walsh codes used in conventional systems. Users are assigned a code selected from the set of Walsh codes, if available. If the number of users exceeds the number of available Walsh codes, selected users are assigned to quasi-orthogonal codes. The users assigned quasi-orthogonal codes are chosen based on user mobility.

Inventors: Sourour; Essam (Cary, NC), Atarius; Roozbeh (Cary, NC), Khayrallah; Ali (Apex, NC)

Assignee: Telefonaktiebolaget LM Ericsson (Publ)

International Classification: H04J 11/00 (20060101); H04B 7/216 (20060101)

Expiration Date: 2019-11-07 0:00:00