Time domain combined synchronization method for orthogonal frequency division multiplexing (OFDM) ultra wide band system receiver
An orthogonal frequency division and ultra-wideband technology, applied in the field of time-domain joint synchronization, can solve the problems of system complexity and low precision
Inactive Publication Date: 2009-12-09
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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[0007] In order to overcome the shortcomings of low precision and complex systems in the prior art, the present invention provides a time-domain joint synchronization method for OFDM ultra-wideband system receivers, which can synchronously estimate carrier integer frequency offset, carrier fractional frequency offset The synchronous estimation and frame timing synchronous estimation are integrated and jointly processed to realize the identity of the generation modules of the above three methods and the sharing of operation data and parameters; at the same time, the rough estimation range obtained by the frame timing synchronization is used to perform preliminary symbol timing synchronization, and then Method for Joint Synchronization of Symbol Timing Based on Frame Timing Synchronization Results and Initial Symbol Timing Synchronization Results
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[0061] In the embodiment, the indoor precise navigation and positioning system based on OFDM ultra-wideband technology is used as the supporting platform to illustrate the implementation process of the receiver time-domain joint synchronization method proposed by the present invention. In this example, the transmitted signal introduces Gaussian white noise Calculate the signal-to-noise ratio of the received signal. The specific implementation steps are as follows:
[0062] Step 1: Determination of information frame format
[0063] In this embodiment, an information frame includes a preamble and a payload, and the preamble includes a frame synchronization sequence and a channel estimation sequence. A complete information frame structure is as follows figure 1 shown.
[0064] In this embodiment, the description of the composition and structure of the frame synchronization sequence is as follows: figure 2 Schematically, in a specific embodiment of an indoor precise navigation...
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The invention discloses a time domain combined synchronization method for an OFDM ultra wide band system receiver. A new information frame format is determined according to requirement of all synchronization methods; after frame timing combined synchronization operation and symbol timing combined synchronization are carried out on received signals sequentially, whether carrier fraction frequency deviation synchronization or carrier integer frequency deviation synchronization is executed is determined according to window interval, and then the data in dual sliding window is used for carrier fraction frequency deviation combined synchronization; or combined synchronization operation of carrier integer frequency deviation is carried out according to the result of the symbol timing combined synchronization operation to obtain the carrier integer frequency deviation, so as to complete one operation period of the combined synchronization method. The invention has higher synchronization precision and anti-interference performance and realizes high integration of all synchronization methods and share of relevant parameters and operation result.
Description
technical field [0001] The invention relates to a time-domain joint synchronization method, in particular to a time-domain joint synchronization method for an orthogonal frequency division multiplexing ultra-wideband system receiver. Background technique [0002] Orthogonal Frequency Division Multiplexing Ultra WideBand (OFDM-UWB) system receiver synchronization methods mainly include carrier frequency offset (including integer frequency offset and fractional frequency offset) synchronization, frame timing synchronization and symbol Timed synchronization. At present, the carrier frequency offset synchronization technology mainly includes preamble-based time-domain correlation carrier synchronization method, preamble-based frequency-domain correlation carrier synchronization method, cyclic prefix-based maximum likelihood carrier synchronization method and pilot-based frequency domain correlation method. Carrier synchronization method; frame timing synchronization technology ...
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IPC IPC(8): H04L27/26
Inventor 卢晓春邹德财王瑾白燕
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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