Pilot Signal Allocation Method and Apparatus
First Claim
13. The method of 1 wherein non-contiguous cyclic time shifts in the first and second set of cyclic time shifts comprises leaving a first cyclic time shift unassigned and a second cyclic time shift unassigned from the third set of cyclic time shifts, and further comprises including at least one of the cyclic time shifts from the third set having a value between the first unassigned cyclic time shift and the second unassigned cyclic time shift.
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Accused Products
Abstract
A pilot (or reference) transmission scheme is utilized where different transmitters are assigned pilot sequences with possibly different cyclic time shifts and different base pilot sequences. A pilot signal is transmitted concurrently by the transmitters in a plurality of pilot blocks, and a receiver processes the plurality of received pilot blocks to recover a channel estimate for at least one of the transmitters while suppressing the interference due to the pilot signals from the other transmitters.
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Citations
23 Claims
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13. The method of 1 wherein non-contiguous cyclic time shifts in the first and second set of cyclic time shifts comprises leaving a first cyclic time shift unassigned and a second cyclic time shift unassigned from the third set of cyclic time shifts, and further comprises including at least one of the cyclic time shifts from the third set having a value between the first unassigned cyclic time shift and the second unassigned cyclic time shift.
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16. A method for pilot transmission, the method comprising the steps of:
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receiving a resource allocation message; determining, based on the resource allocation message, a first time shift, a second time shift, a third time shift, a fourth time shift and a first block modulation sequence, and a second block modulation sequence, transmitting a first block over a first plurality of subcarriers at a first time, wherein the first block comprises a first pilot sequence with the first time shift using the first block modulation sequence; and transmitting a second block over the first plurality of subcarriers at a second time, wherein the second block comprises a second pilot sequence with the second time shift using the first block modulation sequence, wherein the second time shift depends on the first time shift, transmitting a third block over a second plurality of subcarriers at a third time, wherein the third block comprises a third pilot sequence with the third time shift using the second block modulation sequence; and transmitting a fourth block over the second plurality of subcarriers at a second time, wherein the fourth block comprises a fourth pilot sequence with the fourth time shift using the second block modulation sequence, wherein the fourth time shift depends on the third time shift. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 17, 18, 19, 20, 21, 22, 23)
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22-1. The method of claim 16 wherein the first and second blocks are the first and second blocks of a first burst.
Specification