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Method and device for determining demodulation pilot frequencies
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A technology for demodulation pilot and determination method, applied in the field of demodulation pilot determination method and device
Active Publication Date: 2013-01-02
江苏肇方智能装备有限公司
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Problems solved by technology
At present, there is no relevant technical solution for TM3 open-loop transmission mode based on DMRS for reference
Method used
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Embodiment 1
[0265] figure 1 It is a schematic diagram of DMRS mapping when there are 12 DMRS groups in the embodiment of the present invention. In this example, the open-loop DMRS pilot can be mapped to {4, 5, 10, 11} OFDM symbols. Assume that the RE positions occupied by DMRS groups 0 to 11 are respectively (xn, yn) (n is a natural number, n=0 to 11), where x represents the index of the subcarrier sequence number in one RB, and y represents the index of the OFDM symbol. The DMRS mapping method in this example is: {x(m), y(m)}={(11-m, (4, 5, 10, 11))}, where m=011. That is to say, the DMRSs of the 12 DMRS groups are respectively mapped on the 11th to 0th subcarriers of the 4th and 5th OFDM symbols. In the present invention, {x(m), y(m)} represents an array, x(m) represents a subcarrier occupied by a DMRS, and y(m) represents an OFDM symbol occupied by a DMRS. Taking {m, (4, 5)} as an example, it means that the DMRS is carried on the mth subcarrier of the 4th and 5th OFDM symbols. In th...
Embodiment 2
[0269] figure 2 It is a schematic diagram of DMRS mapping when there are four DMRS groups in the embodiment of the present invention, such as figure 2 As shown, in this example, the open-loop DMRS pilot can be mapped to {4, 5, 10, 11}th OFDM symbols. It is assumed that RE positions occupied by DMRS groups 0 to 3 are respectively (xn, yn) (n=0 to 3), where x represents a subcarrier sequence number in one RB, and y represents an index of an OFDM symbol. When time division multiplexing is used to map two ports, the resource units mapped by DMRS group 0 to DMRS group 3 are: {x0, y0}={(7,11), (4,5,10,11)}, {x1, y1} = {(6, 10), (4, 5, 10, 11)}, {x2, y2} = {(5, 1), (4, 5, 10, 11)}, {x3 , y3}={(4,0), (4,5,10,11)}, wherein for each DMRS group, TDM or CDM can be used to multiplex different DMRS ports, when each DMRS group It contains two DMRS ports. At this time, the Walsh code can be used to multiplex the two ports on the two pilot resource elements of the same subcarrier on the {...
Embodiment 3
[0272] image 3 It is a schematic diagram of DMRS mapping when there are two DMRS groups in the embodiment of the present invention, such as image 3 As shown, in this example, the open-loop DMRS pilot can be mapped to {4, 5, 10, 11}th OFDM symbols. Let the RE positions occupied by DMRS group 0-DMRS group 1 be (xn, yn) (n=0-1), where x represents the index of the OFDM symbol relative to the subcarrier number in one RB, and y represents the index of the OFDM symbol. When time division multiplexing is used to map two ports, the resource units mapped by DMRS group 0 to DMRS group 1 are: {x0, y0}={(0,5), (4,5,10,11)}, {x1, y1}={(6,11)(4,5,10,11)}, wherein, for each DMRS group, TDM or CDM can be used to multiplex different DMRS ports, when each The DMRS group contains two DMRS ports. At this time, the Walsh code can be used to multiplex the two ports on the two pilot resource elements of the same subcarrier on the {4, 5} OFDM symbols and {10, 11} OFDM symbols For the multiplexin...
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Abstract
The invention discloses a method for determining pilot frequency symbols. The method includes multiplexing different demodulationpilot frequencies for different packets of data resources, and processing different groups of demodulationpilot frequencies by using different pre-coding weights or different beam forming weights; and enabling the different groups of demodulation pilot frequencies to be carried on one or a plurality of OFDMs (orthogonal frequency division multiplexers) of second, third, fourth and fifth OFDM symbols of even-number gaps and zeroth, first, second, third, fourth and fifth OFDM symbols of odd-number gaps. The invention further discloses a device for determining the pilot frequency symbols. The device comprises a distributing unit and a processing unit, the distributing unit is used for multiplexing the different demodulation pilot frequencies for the different packets of data resources, and the processing unit is used for processing the different groups of demodulation pilot frequencies by using the different pre-coding weights or the beam forming weights. DMRS (demodulation reference signals) of different DMRS groups can be respectively carried on the corresponding OFDM symbols and sub-carrier waves, so that interference among channels of the different DMRS groups is avoided, and data of the different DMRS groups can be efficiently and quickly demodulated.
Description
technical field [0001] The present invention relates to pilot bearing technology, in particular to a method and device for determining a demodulation pilot. Background technique [0002] In Long Term Evolution (LTE, Long Term Evolution) Release8 / 9, in order to measure channel quality and demodulate received data symbols, a Common Reference Signal (CRS, Common Reference Signal) is designed. A user equipment (UE, User Equipment) may perform channel measurement through the CRS, so as to determine that the UE performs cell reselection and handover to a target cell. In addition, the measurement of channel quality is performed in the connected state of the UE. When the interference level is high, the physical layer can disconnect the connection through the radio link connection failure signaling related to the high layer. In LTE Release 10, in order to further improve the average spectrum utilization rate of the cell, the cell edge spectrum utilization rate and the throughput rat...
Claims
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