Method and device for broadening multi-carrier communication coherent bandwidth

A multi-carrier communication and coherent bandwidth technology, applied in the field of communication, can solve problems such as increasing system implementation complexity and reducing system spectrum utilization

Inactive Publication Date: 2007-03-28
SHANGHAI RES CENT FOR WIRELESS COMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The former will reduce the spectrum utilization of the system, while the latter will increase the implementation complexity of the system

Method used

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  • Method and device for broadening multi-carrier communication coherent bandwidth
  • Method and device for broadening multi-carrier communication coherent bandwidth
  • Method and device for broadening multi-carrier communication coherent bandwidth

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Embodiment Construction

[0046] Please refer to FIG. 1 for details. Assuming that the maximum delay spread of the multipath channel is smaller than the length of the cyclic prefix (CP), the cyclic shift is performed on the received data sequence in the time domain after the CP is removed. Specifically, as shown in FIG. 1 , the data segment A is deleted from the OFDM symbol from which the cyclic prefix is ​​removed, and at the same time, the data segment is added to the end of the OFDM symbol. Obviously, the circular convolution characteristic in the received signal is still preserved, so the signal distortion caused by the channel can still be corrected by frequency-domain single-tap equalization.

[0047] The coherent bandwidth of the channel can be expanded by cyclically shifting the data segment at the front of the OFDM symbol after timing synchronization to the tail of the OFDM symbol, and the proof is as follows.

[0048] To simplify the representation, assuming that the channel is a two-path fad...

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Abstract

The invention advances a method device for broadening multiple carrier communication coherence bandwidth by cyclic shift of sampled value of time-domain signal in accordance with OFDM system. In OFDM system, it makes cyclic shift on received time-domain data sequence without cyclic prefix. And it comprises: deleting data segment A from OFDM symbol without cyclic prefix and simultaneously adding the data segment to the tail of the OFDM symbol; therefore, signal distortion caused by channel can be corrected by frequency-domain single tapping equilibrium. And it is simple to implement, able to act as an independent module applied to any frequency-domain pilot-based OFDM and MIMO-OFDM system channel estimation so as to improve system performance.

Description

technical field [0001] The invention belongs to the communication field, and relates to multi-carrier transmission, in particular to Orthogonal Frequency Division Multiplexing (Othogonal Frequency Division Multiplexing) technology. Background technique [0002] Over-the-air signal transmission technology has become a new research focus. In order to obtain a spectrum efficiency up to 10bps / Hz, support the communication needs of various scenarios, and support various adaptive control technologies, the signal transmission technology of the new mobile communication system must support better performance than any previous similar technology, and at the same time Maintain manageable implementation complexity. In broadband mobile communication systems, due to the influence of multipath, the transmitted signal suffers from frequency selective fading. Orthogonal Frequency Division Multiplexing (Othogonal Frequency Division Multiplexing) technology (abbreviated as OFDM technology) i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 李明齐卜智勇张小东唐琳周斌周平杨秀梅王海峰
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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