Channel estimation method suitable for space-frequency encoding cascade cycle detention diversity mode

A cascading loop and delay diversity technology, applied in diversity/multi-antenna systems, preventing/detecting errors through diversity reception, electrical components, etc., can solve the problem that the accuracy of channel estimation affects the detection of received signals, there is no clear description, channel Estimation difficulties and other issues, to achieve the effect of improving bit error rate performance, simple operation, and reducing complexity

Inactive Publication Date: 2008-10-29
ZTE CORP
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Problems solved by technology

[0004] In the SFBC+CDD diversity scheme, because CDD increases the frequency selectivity of the channel, it brings great difficulties to channel estimation
The accuracy of channel estimation directly affects the detection of received signals, thus affecting the performance of the...

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  • Channel estimation method suitable for space-frequency encoding cascade cycle detention diversity mode
  • Channel estimation method suitable for space-frequency encoding cascade cycle detention diversity mode
  • Channel estimation method suitable for space-frequency encoding cascade cycle detention diversity mode

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0024] Considering the characteristics of SFBC and CDD, according to the corresponding relationship between the time and frequency domains, the delay in the time domain is equivalent to the phase shift in the frequency domain. Considering that the cyclic delay processing of the signal in the time domain is equivalent to the phase shift processing in the frequency domain, it can be obtained:

[0025] ψ ( kδ ) = e - j 2 π N kδ

[0026] Among them, δ is the delay amount selected by CDD, N is the number of points of inverse Fourier transform (IFFT), and k is the number of subcarriers.

[0027] The CDD p...

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Abstract

The invention discloses a channel estimation method applicable to cyclic delay diversity mode of a space-frequency encoding cascade; wherein, adjacent two pilot frequencies on a same data stream are respectively positioned at an odd location and an even location of subcarrier. The pilot frequency at the odd location on the data stream is used for estimating an equivalent channel response at the odd location of an antenna while the pilot frequency at the even location on the data stream is used for estimating the equivalent channel response at the even location of the antenna. By adopting the channel estimation method of the invention, not only the bit error rate performance is improved, but also the complexity of the channel estimation is reduced, thus ensuring the accuracy of the channelestimation and improving the reliability of the whole communication system.

Description

technical field [0001] The present invention relates to a wireless communication system, in particular to a channel estimation method suitable for space-frequency coding cascade cyclic delay diversity. Background technique [0002] The next generation of wireless communication systems will provide better voice quality and faster data transfer rates. However, the time-varying multi-path transmission environment, limited bandwidth resources and users' demands on services make it very difficult to realize the above requirements. An effective way to solve these problems is to adopt diversity technology. SFBC (space-frequency block codes, space-frequency coding) + CDD (cyclic delay diversity, cyclic delay diversity) was adopted by the third generation because it combines the characteristics of space-frequency coding and cyclic delay diversity and has no requirement for the number of antennas at the transmitting end. Mobile Communication System Standardization Organization (3 r...

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Application Information

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IPC IPC(8): H04B7/02H04B1/707H04L25/02H04L1/06
Inventor 赵琼
Owner ZTE CORP
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