Method and apparatus for pilot signal transmission
First Claim
Patent Images
1. A method for pilot transmission, the method comprising the steps of:
- transmitting a plurality of data symbols over a first plurality of sub-carriers, each sub-carrier within the first plurality of sub-carriers having a first bandwidth;
transmitting first pilot symbols at a first time for a user, the first pilot symbols transmitted in a first pattern over a second plurality of sub-carriers, each sub-carrier from the second plurality of sub-carriers having a second bandwidth; and
transmitting second pilot symbols for the user at a second time, the second pilot symbols transmitted in a second pattern over a third plurality of sub-carriers, each sub-carrier from the third plurality of sub-carriers having a third bandwidth larger than the first bandwidth; and
wherein the data symbols and the first and the second pilot symbols are not transmitted concurrently.
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Abstract
A method and apparatus for pilot signal transmission is disclosed herein. In particular, a pilot transmission scheme is utilized where pilot sub-carrier bandwidth differs from data sub-carrier bandwidth. Because some user'"'"'s data sub-carriers will no longer have the user'"'"'s pilot sub-carriers adjacent to them, the set, or pattern of sub-carriers used by the pilot blocks changes at least once in a burst. Changing the pilot block pattern (the set of occupied pilot block sub-carriers) at least once in the burst serves to increase the frequency proximity of occupied data sub-carriers to occupied pilot sub-carriers in the burst.
148 Citations
19 Claims
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1. A method for pilot transmission, the method comprising the steps of:
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transmitting a plurality of data symbols over a first plurality of sub-carriers, each sub-carrier within the first plurality of sub-carriers having a first bandwidth; transmitting first pilot symbols at a first time for a user, the first pilot symbols transmitted in a first pattern over a second plurality of sub-carriers, each sub-carrier from the second plurality of sub-carriers having a second bandwidth; and transmitting second pilot symbols for the user at a second time, the second pilot symbols transmitted in a second pattern over a third plurality of sub-carriers, each sub-carrier from the third plurality of sub-carriers having a third bandwidth larger than the first bandwidth; and wherein the data symbols and the first and the second pilot symbols are not transmitted concurrently. - View Dependent Claims (2, 3, 4, 5, 13)
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6. An apparatus comprising:
transmission circuitry transmitting a plurality of data symbols over a first plurality of sub-carriers, each sub-carrier within the first plurality of sub-carriers having a first bandwidth, the transmission circuitry additionally transmitting first pilot symbols at a first time for a user, the first pilot symbols transmitted in a first pattern over a second plurality of sub-carriers, each sub-carrier from the second plurality of sub-carriers having a second bandwidth and transmitting second pilot symbols for the user at a second time, the second pilot symbols transmitted in a second pattern over a third plurality of sub-carriers, each sub-carrier from the third plurality of sub-carriers having a third bandwidth larger than the first bandwidth and wherein the data symbols and the first and the second pilot symbols are not transmitted concurrently. - View Dependent Claims (7, 8)
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9. A method for pilot transmission, the method comprising the steps of:
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transmitting a plurality of data symbols over a first plurality of subcarriers, each subcarrier within the plurality of subcarriers having a first bandwidth; transmitting pilot symbols at a first time for a user in a first pattern over a second plurality of subcarriers, each subcarrier from the second plurality of subcarriers having a second bandwidth; determining, whether to transmit pilot symbols or data symbols at a second time for the user over a third plurality of subcarriers; wherein the first and the second bandwidths are not equal; and if the determination is made to transmit data symbols, transmitting a plurality of data symbols at the second time over the third plurality of subcarriers, or if the determination is made to transmit pilot symbols, transmitting pilot symbols for the user in a second pattern at the second time over the third plurality of subcarriers having a third bandwidth larger than the first bandwidth. - View Dependent Claims (10, 11, 12, 14)
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15. A method for pilot transmission, the method comprising the steps of:
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transmitting a plurality of data symbols over a first plurality of sub-carriers, each sub-carrier within the first plurality of sub-carriers having a first bandwidth; transmitting first pilot symbols at a first time for a user, the first pilot symbols transmitted in a first pattern over a second plurality of sub-carriers, each sub-carrier from the second plurality of sub-carriers having a second bandwidth; and transmitting second pilot symbols for the user at a second time, the second pilot symbols transmitted in a second pattern over a third plurality of sub-carriers, each sub-carrier from the third plurality of sub-carriers having a third bandwidth larger than the first bandwidth; and wherein the data symbols are DFT spread prior to transmitting over the first plurarity of sub-carriers; and wherein the data symbols and the first and the second pilot symbols are not transmitted concurrently. - View Dependent Claims (16, 17, 18, 19)
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Specification