Method for SC-FDE (single carrier-frequency domain equalization) system low complexity RLS self-adaption channel estimation

A SC-FDE, adaptive channel technology, applied in baseband system components and other directions, can solve problems such as high complexity and power consumption, cannot completely eliminate feedback errors, etc., and achieve good performance.

Inactive Publication Date: 2012-09-12
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

The disadvantage is that FFT also needs to feed back the data except UW in a data block, which cannot completely eliminate the in

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  • Method for SC-FDE (single carrier-frequency domain equalization) system low complexity RLS self-adaption channel estimation
  • Method for SC-FDE (single carrier-frequency domain equalization) system low complexity RLS self-adaption channel estimation
  • Method for SC-FDE (single carrier-frequency domain equalization) system low complexity RLS self-adaption channel estimation

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[0027] In order to describe content of the present invention conveniently, at first the terms used in the present invention are defined:

[0028] Definition 1 Single-carrier frequency-domain equalization (SC-FDE): block data at the sending end, insert UW before and after the data to form CP (or copy the tail data of the block-blocked data to the front to form CP), perform single-carrier modulation and enter Channel: Remove the CP at the receiving end, transform to the frequency domain through FFT, and return to the time domain for symbol decision after frequency domain equalization through IFFT. Set the sent data after block as: , is the data length. , the length inserted between the data is The UW, as a CP, forms a complete data block (Data Block): Incoming channel, data block length . The equivalent discrete channel impulse response (CIR, Channel Impulse Response) is: , is the channel length. After the receiving end removes the CP of the data block, it passe...

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Abstract

The invention discloses a method for SC-FDE (single carrier-frequency domain equalization) system low complexity RLS self-adaption channel estimation. Two special words UW inserted between sending data continuously are used as channel estimation sequences, and a front UW forms a cyclic prefix of a rear UW. The UW is the known sequence, so that an FFT (Fast Fourier Transform) feedback module is not needed by a receiving end, and the problem of channel estimation error caused by feedback error is avoided; and simultaneously, the receiving data of the rear UW is a result of cyclic convolution of the receiving data and the channel, through channel estimation carried out from FFT to a frequency domain, the RLS channel is updated to be inverse operation of a diagonal matrix at the time, and the complexity is greatly reduced. A final channel frequency response, which is obtained by channel frequency response estimated by RLS through an inserted value filter, is used as a parameter of an equalizer. The complexity of the inserted value filter is further reduced, so that the whole complexity is lower.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and particularly relates to an adaptive channel estimation method using a single carrier modulation with frequency domain equalization (SC-FDE) modulation system in mobile communication. Background technique [0002] The single-carrier frequency-domain equalization system refers to a system in which the transmitting end uses single-carrier modulation and the receiving end uses frequency-domain equalization. The number of taps of the time-domain equalizer is proportional to the data transmission rate, and the frequency-domain equalization under high-speed communication is much less complex than the time-domain equalization. Compared with Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing), single carrier frequency domain equalization has similar system structure, complexity and performance. Therefore, SC-FDE, like OFDM, has become one of the ...

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Application Information

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IPC IPC(8): H04L25/02
Inventor 艾赳赳成先涛岳光荣李少谦
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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