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Data symbol orthogonal processing method and device

A technology of data symbols and processing methods, applied in multi-frequency code systems, through diversity reception to prevent/detect errors, etc., can solve problems such as large interference, affect the accuracy of demodulation reference symbol channel estimation, etc., to reduce power amplifier design. the effect of

Inactive Publication Date: 2012-03-14
ZTE CORP
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Problems solved by technology

like figure 2 As shown, if no processing is done on the orthogonal codes on the two groups, for example, the corresponding ports use the same OCC code, when despreading, due to the existence of inter-carrier interference, the port corresponding to the same OCC code The interference will be relatively large, which will affect the accuracy of channel estimation of demodulation reference symbols

Method used

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  • Data symbol orthogonal processing method and device
  • Data symbol orthogonal processing method and device

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Embodiment 1

[0070] In this embodiment, an orthogonal mapping method based on the BPSK modulation table (ie +1 and -1) is illustrated. Figure 4 It is a schematic diagram of the quadrature mapping based on the modulation mode of binary phase shift keying (BPSK, Binary Phase Shift Keying) of the present invention, as Figure 4 As shown in the figure, two code division multiplexing groups and each code division multiplexing group has a maximum of 4 ports as an example for illustration. In order to realize the time-frequency two-dimensional orthogonality based on each physical resource block (PRB, PhysicalResource Block), in each code division multiplexed port group G i port {p within i ∈ {0, 1} i，0 p i，1 …p i，L}, L is up to 3, which are processed by using orthogonal codes a, b, c, d respectively. where a, b, c, d represent walsh matrix respectively different columns. In practical applications, it may also be other different orthogonal matrices, such as matrices based on DFT.

[00...

Embodiment 2

[0080] In this embodiment, an orthogonal code mapping method based on high-order modulation is given. In the method given in this embodiment, on the basis of intra-group codeword mapping, different OCC Mapping achieves the effect of inter-carrier interference compression without changing the effect of intra-group design. In this embodiment, the demodulation reference symbol port of the same code division multiplexing selects the same OCC code on its corresponding different DMRS subcarriers, but in order to realize the orthogonality in the time-frequency two-dimensional direction, in the frequency domain direction , respectively multiply different phase weight factors for different ports of the same group. Figure 6 It is a schematic diagram of orthogonal code mapping when the present invention is based on the alphabet of high-order modulation, such as Figure 6 As shown, in the mapping mode with assigned OCC codes, at different carrier positions, for port p 0，0 and p 1，0 mu...

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Abstract

The invention discloses a data symbol orthogonal processing method which is used for grouping code division multiplexing data ports. The method comprises the following steps of: distributing an orthogonal code for one of groups of ports, distributing orthogonal codes for other groups of ports in different manners and multiplying the orthogonal codes of the other groups of different ports according to different phases of factor weights; and carrying out orthogonal processing on data on each port in each group. The invention simultaneously discloses a data symbol orthogonal processing device which comprises a grouping unit, a distribution unit, a first processing unit and a second processing unit, wherein the grouping unit is used for grouping the code division multiplexing data ports; the distribution unit is used for distributing the orthogonal code for one of the groups of ports and also distributing the orthogonal codes for the other groups of ports in different manners; the first processing unit is used for multiplying the orthogonal codes of the other groups of different ports according to the different phases of factor weights; and the second processing unit is used for carrying out the orthogonal processing on the data on each port in each group according to the orthogonal codes distributed by the distribution unit. With the adoption of the data symbol orthogonal processing method and the data symbol orthogonal processing device, the data on the ports among the groups are completely orthogonal to avoid the effect of interference on channel estimation.

Description

technical field [0001] The present invention relates to data symbol orthogonal processing technology, in particular to a demodulation pilot symbol (DMRS, Demodulation Reference Signal) orthogonal processing method and device. Background technique [0002] The high-order multi-antenna technology is one of the key technologies of the Long Term Evolution Advanced (LTE-A or LTE-Advanced, Long Term Evolution Advanced) system, and is used to increase the system transmission rate. In order to achieve channel state measurement and data demodulation after the introduction of high-order multi-antenna technology, the LTE-Advanced system defines two types of pilot symbols: data demodulation pilot symbols (DMRS, Demodulation Reference Signal) and channel state measurement pilots A symbol (CSI-RS, Channel State Information-Reference Signal), wherein the demodulation pilot symbol is a reference symbol used for demodulation of a Physical Downlink Shared Channel (PDSCH, Physical Downlink Sha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L1/06
Inventor 孙云峰张文峰郭森宝张峻峰
Owner ZTE CORP
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