Method for compensating for multi-path of a CDMA reverse link utilizing an orthogonal channel structure
First Claim
1. An apparatus for receiving reverse link signals from a plurality of subscriber units comprising:
- a receiver that receives a first plurality of reverse link signals and a second plurality of reverse link signals in a time interval, wherein each said reverse link signal of the first plurality of reverse link signals is derived from at least a common pseudo noise (PN) sequence and unique orthogonal sequence and each said reverse link signal of the second plurality of reverse link signals is derived from a unique pseudo noise (PN) sequence, wherein each said reverse link signal of the first plurality of reverse link signals is sent by a subscriber unit when not actively transmitting user data; and
a timing controller that determines a timing offset associated with at least one reverse link signal to align a timing of the at least one reverse link signal with reverse link signals from other subscriber units, wherein the one reverse link signal is at least one of the first plurality of reverse link signals or the second plurality of reverse link signals.
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Accused Products
Abstract
A base station receives a reverse link signal from a given field unit that includes a common code (i.e., shared by other field units) and a unique orthogonal code (i.e., distinguishing the given field unit from other field units). The reverse link signal travels in a multi-path environment along a primary path and at least one secondary path. The base station makes a diversity decision based on the unique orthogonal code seen at two different phases. The base station determines a gross timing offset to align the common code of the given field unit with the common code from other field units using unique orthogonal codes. The given field unit makes a corresponding coarse adjustment of the phase of its common code.
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Citations
15 Claims
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1. An apparatus for receiving reverse link signals from a plurality of subscriber units comprising:
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a receiver that receives a first plurality of reverse link signals and a second plurality of reverse link signals in a time interval, wherein each said reverse link signal of the first plurality of reverse link signals is derived from at least a common pseudo noise (PN) sequence and unique orthogonal sequence and each said reverse link signal of the second plurality of reverse link signals is derived from a unique pseudo noise (PN) sequence, wherein each said reverse link signal of the first plurality of reverse link signals is sent by a subscriber unit when not actively transmitting user data; and a timing controller that determines a timing offset associated with at least one reverse link signal to align a timing of the at least one reverse link signal with reverse link signals from other subscriber units, wherein the one reverse link signal is at least one of the first plurality of reverse link signals or the second plurality of reverse link signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of receiving reverse link signals from a plurality of subscriber units comprising:
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receiving a first and a second plurality of reverse link signals in a time interval, wherein each reverse link signal of the first plurality of reverse link signals is derived from a common pseudo noise sequence and a unique orthogonal sequence and each reverse link signal of the second plurality of reverse link signals is derived from a unique pseudo noise sequence, wherein each said reverse link signal of the first plurality of reverse link signals is sent by a subscriber unit when not actively transmitting user data; and determining a timing offset associated with at least one reverse link signal to align the at least one reverse link signal with reverse link signals from other subscriber units, wherein the one reverse link signal is at least one of the first plurality of reverse link signals or the second plurality of reverse link signals. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A subscriber unit comprising:
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at least one processor configured to receive a timing offset, wherein the at least one processor is further configured to transmit a reverse link signal derived from a common pseudo noise sequence and a unique orthogonal sequence; wherein a timing of the reverse link signal is adjusted in response to the received timing offset; and wherein the common pseudo noise sequence and different unique orthogonal sequences are used by a first plurality of other subscriber units in a same time interval for reverse link transmissions and unique different pseudo noise sequences are used by a second plurality of other subscriber units in the same time interval for reverse link transmissions, wherein each said reverse link signal is sent by a first plurality of subscriber units when not actively transmitting user data. - View Dependent Claims (15)
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Specification