Use of orthogonal or near orthogonal codes in reverse link
First Claim
1. In a system that supports code division multiple access communications among members of a first group of terminals and among a second group of terminals, a method comprising the steps of:
- assigning to the first group of terminals a first pseudorandom noise code, each user of the first group being uniquely identifiable by a unique code phase offset;
assigning to the second group of terminals the first pseudorandom noise codes, with each user of the second group also being assigned a common phase offset of that same pseudorandom noise code assigned to the first group; and
assigning to each terminal of the second group a unique orthogonal spreading code, the unique orthogonal spreading code having a chipping rate less than the chipping rate of the first pseudorandom noise code.
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Accused Products
Abstract
A technique for allowing a first and second group of users to share access to a communication channel such as a wireless radio channel is disclosed. The first group of users can be a group of legacy users such as those that use digital CDMA cellular telephone equipment based on the IS-95 standard. The second group of users can be a group of web surfers that code their transmissions using one of multiple formats. The first group of users can share one modulation structure such as, on a reverse link, using unique phase offsets of a common pseudorandom noise (PN) code. The second group of users can share another modulation structure, but in a manner that is consistent and compatible with the users of the first group. Specifically, the users of the second group may all use the same PN code and code phase offset. Each channel used by the second group of users can be uniquely identified by a corresponding unique orthogonal code.
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Citations
27 Claims
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1. In a system that supports code division multiple access communications among members of a first group of terminals and among a second group of terminals, a method comprising the steps of:
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assigning to the first group of terminals a first pseudorandom noise code, each user of the first group being uniquely identifiable by a unique code phase offset;
assigning to the second group of terminals the first pseudorandom noise codes, with each user of the second group also being assigned a common phase offset of that same pseudorandom noise code assigned to the first group; and
assigning to each terminal of the second group a unique orthogonal spreading code, the unique orthogonal spreading code having a chipping rate less than the chipping rate of the first pseudorandom noise code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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- 14. A wireless communication system comprising a first set of access units and a second set of access units, the first set of access units and the second set of access units capable of communicating with a base station wherein the first set of access units use pseudorandom noise codes at a first chipping rate to separate their user channels, each individual unit of the first set of access units having at least one pseudorandom noise sequence with a unique phase shift, and wherein the second group of access units share a pseudorandom noise code and phase shift at the first chip rate that is not used by the first group of access units, each individual unit of the second set of access units also using at least one orthogonal spreading code, the orthogonal spreading code having a chipping rate less than the first chipping rate.
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27. A system that supports code division multiple access communications among members of a first group of terminals and among a second group of terminals, the system comprising:
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means for assigning to the first group of terminals a first pseudorandom noise code, each user of the first group being uniquely identifiable by a unique code phase offset;
means for assigning to the second group of terminals the same pseudorandom noise code as used by the first group, but each terminal of the second group using a common phase offset of that code; and
means for assigning to each terminal of the second group an orthogonal spreading code, the orthogonal spreading code having a chipping rate less than the chipping rate of the first pseudorandom noise code.
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Specification