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US 2002/0172187 A1Published application
Method for data packet acquisition using split preamble
AssigneeTexas Instruments Incorporated
InventorsOfir Shalvi, Daniel Wajcer
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Abstract
A data packet type communication system utilizes packet framing wherein preambles are split into tow or more subpreambles, separated by a number of data or a priori known symbols. A receiver chooses among individual and combined subpreamble options for determining synchronization. When a noise impulse prevents detection of one subpreamble, the impulse is detected, and preamble correlation proceeds using an unaffected subpreamble. When no impulse is detected, combined subpreambles are used.
Claims1
A method for acquiring packet synchronization in a packet type communication network, comprising:
- providing a data packet having a framing format including a preamble split into a plurality of subpreambles;
- for individual subpreamble and for combined subpreamble options, determine the following parameter:
- 4 β i = 1 T i 2 · ∫ t i t i + T i | r ( t ) · ⅇ - j φ i ^ | 2 ⅆ t ;
- where Ti is the preamble or subpreamble duration in each option, ti is the preamble or subpreamble start time, and {circumflex over (φ)}l is the estimated phase shift in each option;
- determine synchronization using correlation with a priori known symbols using the subpreamble or combined subpreamble option which provides the lowest β.
2 more elements
Dependencies are inferred from the claim text.