Frequency domain balancer design method in orthogonal frequency division multiplexing system

A frequency domain equalization and orthogonal frequency division technology, applied in equalizers, multi-frequency code systems, baseband system components and other directions, can solve problems such as unacceptable computational complexity

Inactive Publication Date: 2007-11-28
SHANGHAI UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Although this scheme can achieve good equalization performance, its computational complexity is unacceptable

Method used

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  • Frequency domain balancer design method in orthogonal frequency division multiplexing system
  • Frequency domain balancer design method in orthogonal frequency division multiplexing system
  • Frequency domain balancer design method in orthogonal frequency division multiplexing system

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Embodiment Construction

[0067] A preferred embodiment of the present invention is described in detail as follows in conjunction with accompanying drawing:

[0068] As shown in Figure 1, the data to be transmitted is firstly processed serially / parallelly, and then parallelly / serially processed after IFFT processing, which realizes OFDM modulation. Add the cyclic prefix CP before each OFDM symbol that has been modulated, and then it can be sent into the channel. The data passing through the channel will experience various effects such as channel multipath, fading, Doppler frequency shift, and additive Gaussian white noise. The received signal is first removed from the CP, and then undergoes serial / parallel processing and waits for FFT processing. The data after FFT processing realizes OFDM demodulation, and the data of the pilot position in the demodulated data will be used for For channel estimation and signal-to-noise ratio estimation, the channel impulse response and signal-to-noise ratio estimate ...

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Abstract

The invention discloses a designing method of frequency domain equalizer in the orthogonal frequency division multiplexing system, which comprises the following steps: utilizing MMSE criterion to get optimum expression formula of tapping power factor of frequency domain equalizer; possessing front system and compensating system of the frequency domain equalizer; making the residual interference power to eliminate ISI and ICI completely; inhibiting the noise power of residuals; obtaining the optimum frequency domain equalizer with simple structure; improving the usage of frequency band of system without adding the CP length which is less than the length of channel impaction respond length.

Description

technical field [0001] The invention relates to a channel equalization technology in the field of wireless communication, in particular to a design method of a frequency domain equalizer in an Orthogonal Frequency Division Multiplexing (OFDM) system. Background technique [0002] With the rapid development and increasing integration of wireless communication, data communication and the Internet, while mobile users' demands for various services are increasing, the requirements for communication rates are also increasing. Wireless communication technology is experiencing unprecedented development opportunities. At the same time, any progress in wireless research must focus on a theme, that is, it must be able to better solve the quality problems faced by high-speed wireless communication itself, such as bandwidth constraints, poor propagation channels, complex mobile environments, and limited services. The broadband frequency selective multipath fading caused by the high rate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/01H04L25/03
Inventor 王勇金彦亮陈惠民徐卫兴
Owner SHANGHAI UNIV
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