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Demodulating method for multi-stream data and system thereof

A demodulation method and demodulation system technology, applied in the field of wireless communication, can solve problems such as increased pilot overhead, and achieve the effects of small pilot overhead and good compatibility

Inactive Publication Date: 2009-09-23
BEIJING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

When the pilot density increases, the performance of channel estimation will be improved, but at the same time the pilot overhead will also increase

Method used

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  • Demodulating method for multi-stream data and system thereof
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  • Demodulating method for multi-stream data and system thereof

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Embodiment Construction

[0023] The invention discloses a special pilot design pattern for conventional CP and extended CP structure for demodulating dual-stream / four-stream / eight-stream data channels, relates to the advanced 3GPP long-term evolution technology LTE-A system, and is mainly used in high-end Data demodulation for multi-order antennas and coordinated multi-point transmission, etc. The dual-stream and four-stream dedicated pilot density designed by the present invention is: in a resource block pair, corresponding to each layer of data, 2 columns of pilot symbols are evenly inserted in the time domain, and 3 columns of pilot symbols are evenly inserted in the frequency domain of each column Pilot symbols, two columns of pilot symbols are placed alternately in the frequency domain. The eight-stream dedicated pilot density designed by the present invention is: in a resource block pair, corresponding to each layer of data, a column of pilot symbols is inserted at the same position in each subf...

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Abstract

The invention provides a demodulating method for multi-stream data and a system thereof. The demodulating method comprises the steps as follows: a pilot frequency symbol sequence is generated; for double-stream and four-stream data demodulation, two rows of pilot frequency symbols are equidistantly inserted in time domain correspondingly to each data stream in a pair of resource blocks; for eight-stream demodulation, one row of pilot frequency symbols are inserted in time domain while one pilot frequency symbol is inserted in every four sub-carrier-waves correspondingly to each data stream ina resource block, wherein, the pilot frequency and the data employ the same pre-coding mode; signals are sent to a receiver by an antenna; composite channel of resource particles, which is occupied by the pilot frequency, is estimated according to the inserted pilot frequency symbols when the signals are received by the receiver; the composite channel of resource particles, which is occupied by the data signals, is acquired by interpolation algorithm, thereby obtaining the data signals by demodulating. The special pilot frequency designed by the invention considers influence of factors, such as performance, spending and the like, thus having excellent compatibility with LTE Release 8.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to the design of a dedicated reference symbol (RS) for downlink data demodulation in Universal Mobile Telecommunications System (UMTS) Long Term Evolution Advanced (LTE-A), so as to realize the demodulation method and system of multi-stream data . Background technique [0002] In the LTE-A system, in order to further improve the peak rate and spectrum utilization, it is decided to use a higher antenna order, such as the downlink 8×8 antenna. On the other hand, in order to improve the performance of cell edge users, Coordinated Multipoint (CoMP) is incorporated into the LTE-A framework by the 3rd Generation Partnership Project (3GPP). In order to effectively support technologies such as high-order MIMO (Multiple Input Multiple Output) and CoMP, it has become a consensus to add a new RS. [0003] At the 56th meeting of 3GPP TSG RAN WG1, it was decided to introduce Demod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 崔琪楣陶小峰杨姗徐月巧张平
Owner BEIJING UNIV OF POSTS & TELECOMM
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