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Method for realizing integral frequency deviation estimation of receiver

A technology of frequency offset estimation and implementation method, which is applied to the shaping network, multi-frequency code system, baseband system components and other directions in the transmitter/receiver, which can solve the problem of large amount of calculation of the algorithm, and achieve the reduction of the amount of transformation calculation, Effect of reducing implementation complexity and accurate frequency offset estimation

Inactive Publication Date: 2011-07-13
SHANGHAI HUAHONG INTEGRATED CIRCUIT
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Problems solved by technology

Compared with other integer frequency offset estimation algorithms, the estimation speed of this algorithm is fast and the precision is high. However, due to the use of FFT and IFFT operations, the calculation amount of the algorithm is relatively large

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  • Method for realizing integral frequency deviation estimation of receiver
  • Method for realizing integral frequency deviation estimation of receiver
  • Method for realizing integral frequency deviation estimation of receiver

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Embodiment Construction

[0020] specific implementation plan

[0021] The following is attached figure 1 The content of the present invention is described in detail:

[0022] (1) Compensate the fractional multiple frequency offset of the time domain training sequence in the received signal.

[0023] If the length of the time-domain training sequence is N, the time-domain synchronization training sequence is expressed as r I (k), where k=0, 1, ..., N, then the time-domain training sequence after fractional multiple frequency offset compensation is shown in the following formula: r I (k)=r(k)·e -j2πεfk , k=0, 1, ..., N, ε is the estimated fractional frequency offset, f is the synchronization signal carrier spacing, and N is the length of the training sequence in the time domain.

[0024] (2) According to the set interval S, and S is an integer greater than zero. The time-domain training sequence of the received signal is extracted. The extracted time-domain training sequence is:

[0025] r S (n)...

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Abstract

The invention discloses a method for realizing integral frequency deviation estimation of a receiver. The method comprises the following steps of: compensating decimal frequency deviation of a time domain training sequence in a received signal; extracting the time domain training sequence of the received signal according to a set extraction interval; extracting a local training sequence according to the same set interval; transforming the time domain training sequence which is subjected to time extraction into a frequency domain training sequence through FFT (Fast Fourier Transform) according to data length after the time extraction; multiplying the frequency domain training sequence by the extracted shift local training sequence to obtain a frequency domain multiplication result; and transforming the frequency domain multiplication result back to a time domain through IFFT (Inverse Fast Fourier Transform). Each peak value is determined for different shift values; and the shift value corresponding to the maximum peak value is an estimated integral frequency deviation value. By adopting the method, integral frequency deviation estimation can be quickly and accurately realized, and operation and hardware realization complexity in a frequency deviation estimation algorithm can be effectively reduced.

Description

technical field [0001] The invention relates to a method for realizing frequency offset estimation in the communication field, in particular to a method for realizing integer frequency offset estimation of a receiver. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) technology uses the orthogonality of frequency. Once its orthogonality is destroyed, the bit error rate of the system will increase sharply, which is also a major defect of OFDM technology. The main reason for the frequency offset is that the center frequencies of the receiving and transmitting ends of the radio frequency circuit do not match. If the center frequency of the carrier carrier at the sending end is f t , the center frequency of the carrier carrier at the receiving end is f r , then the source data x(n) at the sending end is: at the receiving end for It can be seen that there is a frequency offset f after the data at the receiving end is down-converted r -f t . ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 李刚
Owner SHANGHAI HUAHONG INTEGRATED CIRCUIT
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