Signal acquisition methods and apparatus in wireless communication systems
First Claim
1. An apparatus to receive a communication frame, the apparatus comprising:
- an antenna configured to receive the communication frame, wherein the communication frame includes an acquisition code symbol sequence, and wherein the acquisition code symbol sequence includes a plurality of acquisition code symbols, and wherein at least one of the acquisition symbols includes a subcode sequence with a plurality of subcodes, wherein each subcode of the plurality of subcodes is identical; and
a correlation calculator configured to calculate a matched filter correlation between the plurality of subcodes of the communication frame and a stored version of the plurality of subcodes, resulting in a correlation calculator output, wherein the correlation calculator is also configured to determine a timing offset for further processing of the communication frame.
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Abstract
In an embodiment, a receiver includes an antenna configured to receive a communication frame. The communication frame may include an acquisition code symbol sequence, which in turn may include a plurality of acquisition code symbols. In an embodiment, an acquisition code symbol includes a subcode sequence having a plurality of subcodes. A receiver also may include a correlation calculator coupled to the antenna. The correlation calculator may be configured to determine a correlation between the subcodes of the received communication frame and a stored version of the subcodes. The correlation may be used in determining a timing offset for further processing of the communication frame.
114 Citations
17 Claims
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1. An apparatus to receive a communication frame, the apparatus comprising:
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an antenna configured to receive the communication frame, wherein the communication frame includes an acquisition code symbol sequence, and wherein the acquisition code symbol sequence includes a plurality of acquisition code symbols, and wherein at least one of the acquisition symbols includes a subcode sequence with a plurality of subcodes, wherein each subcode of the plurality of subcodes is identical; and a correlation calculator configured to calculate a matched filter correlation between the plurality of subcodes of the communication frame and a stored version of the plurality of subcodes, resulting in a correlation calculator output, wherein the correlation calculator is also configured to determine a timing offset for further processing of the communication frame. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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2. The apparatus of clam 1, wherein a phase of the correlation calculator output provides an estimate of a frequency offset between a transmitter that transmitted the communication frame and the receiver.
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9. A method for acquiring an acquisition code symbol sequence transmitted in a communication frame, the method comprising:
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receiving the acquisition code symbol sequence, wherein the acquisition code symbol sequence includes a plurality of acquisition code symbols, and wherein an acquisition code symbol includes a subcode sequence having a plurality of subcodes, wherein each subcode of the plurality of subcodes is identical; and calculating a correlation between the plurality of subcodes and a stored version of the plurality of subcodes, to produce a correlation calculator output. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for acquiring an acquisition code symbol sequence transmitted in a communication frame, the method comprising:
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receiving the acquisition code symbol sequence, wherein the acquisition code symbol sequence includes a plurality of acquisition code symbols, and wherein an acquisition code symbol includes a subcode sequence; splitting the acquisition code symbol sequence into a plurality of subcodes, wherein each subcode of the plurality of subcodes is identical; and calculating a matched filter correlation between the plurality of subcodes and a stored version of the plurality of subcodes.
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Specification