Method and apparatus for transmission and reception within an OFDM communication system
First Claim
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1. A method comprising:
- determining a first subcarrier for spread pilot data transmission;
determining a second subcarrier for the spread pilot data transmission;
adjusting a phase of the spread pilot data by a first amount to produce a first phase adjusted spread pilot;
adjusting the phase of the spread pilot data by a second amount to produce a second phase-adjusted spread pilot;
transmitting the first phase-adjusted spread pilot on a first antenna/subcarrier combination; and
transmitting the second phase-adjusted spread pilot on a second antenna/subcarrier combination wherein the second amount differs from the first amount by a predetermined phase value based on the first and the second subcarrier/antenna combinations.
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Abstract
In an OFDM system the same Walsh code is used at the same time for a plurality of transmitters. The multiple transmitters can be from the same, or different devices (e.g., different base stations on the downlink, different terminals on the uplink). Each subcarrier/antenna combination will share a similar pilot Walsh code, except for the fact that the scrambled spread pilot signals will be phase shifted on some subcarriers of some antennas, based on the subcarrier/antenna combination.
122 Citations
7 Claims
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1. A method comprising:
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determining a first subcarrier for spread pilot data transmission; determining a second subcarrier for the spread pilot data transmission; adjusting a phase of the spread pilot data by a first amount to produce a first phase adjusted spread pilot; adjusting the phase of the spread pilot data by a second amount to produce a second phase-adjusted spread pilot; transmitting the first phase-adjusted spread pilot on a first antenna/subcarrier combination; and transmitting the second phase-adjusted spread pilot on a second antenna/subcarrier combination wherein the second amount differs from the first amount by a predetermined phase value based on the first and the second subcarrier/antenna combinations. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system comprising:
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means for adjusting a phase of spread pilot data by a first amount to produce a first phase adjusted spread pilot; means for adjusting the phase of the spread pilot data by a second amount to produce a second phase-adjusted spread pilot; means for transmitting the first phase-adjusted spread pilot on a first antenna/subcarrier combination; and means for transmitting the second phase-adjusted spread pilot on a second antenna/subcarrier combination, wherein the second amount differs from the first amount by a predetermined phase value based on the first and the second subcarrier/antenna combinations.
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Specification