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Adaptive equalization method for single carrier system

An adaptive equalization and single-carrier technology, which is applied in the field of communication, can solve the problems of excessive peak-to-average ratio of FFT transformation data, large, large noise, etc.

Inactive Publication Date: 2009-04-08
北京韦加航通科技有限责任公司
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Problems solved by technology

There are two problems in doing this: (1) Since only a part of the unique word (UW segment) of the sequence length in the balanced data is known, the error calculation will increase the noise of the error calculation part due to the wrong judgment; (2) the entire data There is a problem that the peak-to-average ratio of the FFT transformation data of the segment is too large. At the frequency point with a small amplitude, the adaptive channel estimation is affected by the noise and becomes larger accordingly.

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  • Adaptive equalization method for single carrier system
  • Adaptive equalization method for single carrier system
  • Adaptive equalization method for single carrier system

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Embodiment Construction

[0035] Below, refer to the attached Figure 1~3 The adaptive equalization method of the single carrier system of the present invention is described in detail.

[0036] The core idea of ​​the present invention is: Utilize the characteristic that the data used as the cyclic prefix in the single carrier system is a known UW sequence, separate the known UW sequence from the whole equalized data segment, and combine the equalized signal with its own The error signal is used as the input variable of the adaptive channel estimation, thereby effectively overcoming the shortcomings of the existing algorithms.

[0037] figure 1 It is a schematic diagram of the frame structure of the single-carrier system in the continuous transmission mode. The basic unit in the transmission structure is a block, each data segment x of length N i An information segment s of length N-L i and a UW segment u of known fixed length L as a cyclic prefix.

[0038] Below, first the symbols used in the pres...

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Abstract

The invention provides an adaptive equalization method of a single-carrier system. The method includes the following steps: step A: the received signal is converted to frequency-domain data by fourier transformation; step B: the time-domain equalization data are obtained after frequency-domain equalization and inverse fourier transformation; wherein, each data section xi with length N in the transmission structure consists of an information section si with length N-L and a known UW section u with fixed length L as cyclic prefix; step C: UW section with length L is separated from the time-domain equalization data and the equalized signal and the own error signal are used as the input variables of adaptive channel estimation. The invention can restrict the error measurement in the UW section and reduce the noise impact and also has the advantages of low calculation complexity and small calculation amount.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to an adaptive equalization method for a single carrier system. Background technique [0002] Single carrier frequency domain equalization (single carrier frequency domain equalization, SC-FDE) is a very effective method for combating multipath interference in broadband wireless transmission. In a wireless communication system, in addition to being interfered by various noises, the multipath propagation of the transmitted signal also affects the bit error rate of data transmission, causing inter symbol interference (ISI). With the rapid increase of access and data transmission rates, higher and higher transmission bandwidths cause serious time dispersion, and the received signal contains multipath waves that experience attenuation and delay, causing frequency selective fading, thus lead to severe ISI. At this time, if only time-domain equalization is used to reduce ISI, mor...

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Application Information

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IPC IPC(8): H04L25/03H04L27/26
Inventor 吴昊田金洁方立
Owner 北京韦加航通科技有限责任公司
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