Method and apparatus for transmitting signals in a communication system
First Claim
1. A method of transmitting signals in a communication system, the method comprising the steps of:
- generating pilot channels using different orthogonal codes to provide pilot channels that are orthogonal to one another, the orthogonal pilot channels being synchronized to substantially maintain orthogonality; and
transmitting the orthogonal pilot channels to a mobile station via spatially separated antennas.
5 Assignments
0 Petitions
Accused Products
Abstract
Different orthogonal codes (Wx, Wy) are used to spread common pilot channels (PilotA) intended for transmission to a particular mobile station (106) within a coverage area (sector A) to implement forward link transmit diversity. By implementing separate, different orthogonal codes (Wx, Wy) for each pilot channel (PilotA), the pilot signals transmitted via antennas (218, 222) to a common coverage area (sector A) are orthogonal to one another and thus do not degrade system performance. Additionally, the use of different orthogonal codes (Wx, Wy) for each pilot channel (PilotA) allows the mobile station (106) to discern which pilot channel spread with a different orthogonal code includes corresponding traffic channel (TCH) information. This allows forward link transmit diversity to be enable/disabled based on conditions associated with the environment, the communications channel, etc. without a complete loss of information as seen by the mobile station (106).
229 Citations
21 Claims
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1. A method of transmitting signals in a communication system, the method comprising the steps of:
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generating pilot channels using different orthogonal codes to provide pilot channels that are orthogonal to one another, the orthogonal pilot channels being synchronized to substantially maintain orthogonality; and transmitting the orthogonal pilot channels to a mobile station via spatially separated antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of transmitting signals in a communication system, the method comprising the steps of:
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transmitting a first pilot channel on a first antenna using a first code; transmitting a second pilot channel on a second antenna using a second code that is orthogonal to the first code such that the first pilot channel and the second pilot channel are orthogonal to one another, the orthogonal pilot channels being synchronized to substantially maintain orthogonality. - View Dependent Claims (12, 13)
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14. A method for implementing forward link transmit diversity in a wireless communication system, the method comprising the steps of:
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dividing a predetermined set of orthogonal codes into a plurality of subsets of orthogonal codes; assigning certain antennas servicing a common coverage area certain of the subsets of orthogonal codes; and transmitting, via the antennas, pilot channels and information intended for a mobile station within the common coverage area via the antennas using the orthogonal codes assigned to the antennas, the pilot channels being synchronized to substantially maintain orthogonality. - View Dependent Claims (15, 16, 17, 18)
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19. An apparatus for transmitting signals in a communication system, comprising:
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a first transmitter for transmitting a first pilot channel on a first antenna using a first code; a second transmitter for transmitting a second pilot channel on a second antenna using a second code that is orthogonal to the first code such that the first pilot channel and the second pilot channel are orthogonal to one another, the orthogonal pilot channels being synchronized to substantially maintain orthogonality. - View Dependent Claims (20, 21)
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Specification