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Synchronization method and device for flexible subcarrier OFDM (Frequency Division Multiplexing) system
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A flexible sub- and sub-carrier technology, applied in synchronization devices, multi-frequency code systems, baseband system components, etc., to achieve the effects of low implementation complexity, accurate timing estimation and carrier frequency offset estimation
Active Publication Date: 2011-11-23
STATE GRID INFORMATION & TELECOMM BRANCH +1
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[0006] The technical problem to be solved by the present invention is: how to realize a kind of accurate timing estimation, and realize the synchronous method of OFDM system with lower complexity
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Embodiment 1
[0086] The downsampling factor is 8, and the specific implementation process includes the following steps:
[0087] In step S101, the flexible subcarrier OFDM system transmission signal is generated as follows:
[0088] s ( n ) = 1 N Σ k ∈ Ω S k exp ( j 2 πkn / N ) , 0 ≤ n ≤ N - 1
[0089] Among them, the total number of subcarriers N=1024, the number of effective subcarriers K=128, and the center frequency of the baseband signal is 0. Therefore, the modulated effective subcarrier set Ω={k, 1≤k≤64 or 449≤k≤512}, Other subcarriers are modulated as virtual su...
Embodiment 2
[0107] The downsampling factor is 6, and the specific implementation process includes the following steps:
[0108] In step S101, the flexible subcarrier OFDM system transmission signal is generated as follows:
[0109] s ( n ) = 1 N Σ k ∈ Ω S k exp ( j 2 πkn / N ) , 0 ≤ n ≤ N - 1
[0110] Among them, the total number of subcarriers N=1024, the number of effective subcarriers K=128, and the center frequency of the baseband signal is 0, so the modulated subcarrier set Ω={k, 1≤k≤64 or 449≤k≤512}, other subcarriers Modulate virtual subcarriers. A 128-length c...
Embodiment 3
[0127] The downsampling factor is 4, and the specific implementation process includes the following steps:
[0128] In step S101, the flexible subcarrier OFDM system transmission signal is generated as follows:
[0129] s ( n ) = 1 N Σ k ∈ Ω S k exp ( j 2 πkn / N ) , 0 ≤ n ≤ N - 1
[0130] where the sampling frequency f s =4M, the total number of subcarriers N=1024, the number of effective subcarriers K=128, the center frequency of the baseband signal is 0.125M, so the modulated subcarrier set Ω={k|1≤k≤128}, other subcarriers modulate virtual subcarriers c...
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Abstract
The invention discloses a synchronization method for a flexible subcarrier OFDM (Frequency Division Multiplexing) system, belonging to the technical field of wireless communication transmission. The synchronization method comprises the following steps: (S1) a transmitting end modulates known sequences to generate a training sequence frame on an efficient subcarrier set selected according to service needs and modulates efficient data to generate a time domainsignal frame; (S2) the transmitting end combines the training sequence frame and the time domainsignal frame into transmitting signals and transmits the transmitting signals through an antenna or a coupler and the like; (S3) a receiving end carries out down sampling on the received signals and local training sequences; (S4) the receiving end carries out timing estimation by using the down sampled signal; and (S5) the receiving end estimates carrier frequency shift. According to the synchronization method, accurate timing estimation is realized, and the complexity of the method is lower.
Description
technical field [0001] The invention relates to the technical field of wireless communication transmission, in particular to a synchronization method and device for a flexible sub-carrier OFDM system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is one of the multi-carrier modulation methods. Its main idea is to divide the high-speed serial data stream into several groups of low-speed parallel data streams and modulate them in each sub-carrier. Transmission over the channel, so that the signal bandwidth on each sub-channel is smaller than the coherent bandwidth of the channel, which can effectively reduce the impact of frequency selective fading. With the development of wireless communication, the wireless transmissionsystem supporting multi-service transmission has received extensive attention. Flexible subcarrier OFDM technology can flexibly change the center frequency and bandwidth of the system by modulating subcarriers on ...
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