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Sequence allocating method, transmitting method and wireless mobile station device

A wireless mobile station and sequence allocation technology, applied in wireless communication, multiplexing code allocation, frequency division multiplexing system, etc., can solve the problem of increased inter-cell interference, degradation of channel estimation accuracy, and degradation of data demodulation performance, etc. problem to achieve the effect of reducing cross-correlation

Active Publication Date: 2010-06-16
PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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Problems solved by technology

In the above case, due to the combination of the ZC sequence of r=a, N=11 assigned to cell #A and the ZC sequence of r=c, N=23 assigned to cell #B, or the r=a, N=23 ZC sequence assigned to cell #A, or the r The combination of the ZC sequence of =b, N=23 and the ZC sequence of r=d, N=11 allocated to the cell #B causes the inter-cell interference of DM-RS to increase, the channel estimation accuracy deteriorates, and the data demodulation performance is remarkable the deterioration of

Method used

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  • Sequence allocating method, transmitting method and wireless mobile station device
  • Sequence allocating method, transmitting method and wireless mobile station device
  • Sequence allocating method, transmitting method and wireless mobile station device

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Experimental program
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Embodiment approach 1

[0059] Figure 8 It is a flowchart showing the procedure of the sequence assignment method in the cellular radio communication system according to Embodiment 1 of the present invention.

[0060] First, in step (hereinafter referred to as "ST") 101, the sequence length Nb and the sequence number rb that are the reference of the sequence group to be generated are set. Here, the sequence number rb corresponds to the sequence group number and is smaller than Nb.

[0061] In ST102, the number m of RBs is initialized to 1.

[0062] In ST103, a threshold value Xth(m) corresponding to the number m of RBs is set. In addition, the method of setting the threshold value Xth(m) will be described later.

[0063] In ST104, the ZC sequence length N corresponding to the number m of RBs is set. Assuming that the number m of RBs uniquely corresponds to the sequence length N, for example, N is a prime number that is larger than the size (size) that can be transmitted with the number m of RBs ...

Embodiment approach 2

[0134] The sequence assignment method according to Embodiment 2 of the present invention is based on the cross-correlation characteristics of ZC sequences that the present inventors found out through computer simulation.

[0135] Figure 16 It is a graph showing the cross-correlation characteristics of the ZC sequence, which the present inventors found out by computer simulation.

[0136] exist Figure 16 In , the horizontal axis represents the r / N difference between ZC sequences with different transmission bandwidths or different sequence lengths, and the vertical axis represents the cross-correlation characteristics between ZC sequences. like Figure 16 As shown, when the r / N difference between ZC sequences with different transmission bandwidths or different sequence lengths is 0.0, the cross-correlation between ZC sequences is the largest, and when the r / N difference is 0.5, the correlation between ZC sequences The cross-correlation forms peaks. That is, the cross-corre...

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Abstract

It is an object to provide a sequence allocating method that, while maintaining the number of Zadoff-Chu sequences to compose a sequence group, is configured to make it possible to reduce correlations between different sequential groups. This method comprises the steps of setting a standard sequence with a standard sequence length (Nb) and a standard sequence number (rb) in a step (ST101), setting a threshold value (Xth(m)) in accordance with an RB number (m) in a step (ST103), setting a sequence length (N) corresponding to RB number (m) in a step (ST104), judging whether ]r / N-rb / Nb]<=Xth(m) is satisfied in a step (ST106), including a plurality of Zadoff-Chu sequences with a sequence number (r) and a sequence length (N) in a sequence group (rb) in a step (ST107) if the judgment is positive, and allocating the sequence group (rb) to the same cell in a step (ST112).

Description

technical field [0001] The present invention relates to a sequence allocation method, a transmission method and a wireless mobile station device for a cellular wireless communication system. Background technique [0002] In 3GPP LTE (3rd Generation Partnership Project Long Term Evolution, 3rd Generation Partnership Project Long Term Evolution), a Zadoff-Chu sequence (ZC sequence) is adopted as a reference signal (RS: Reference Signal) used in the uplink. The reason for adopting the ZC sequence as the RS is that the frequency characteristics are equal, and the autocorrelation characteristics and cross-correlation characteristics are good. The ZC sequence is one of the CAZAC (Constant Amplitude and Zero Auto-correlation Code) sequences, expressed by the following formula (1) or formula (2). [0003] [0004] [0005] In formula (1) and formula (2), N is the sequence length, r is the ZC serial number, and N and r are mutually prime relationship. In addition, q is an arb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04B1/707H04J1/00H04J13/00H04J13/16H04J13/22
CPCH04J13/0062H04J13/22H04W72/0466H04J13/0055H04W72/0446H04W72/0453
Inventor 岩井敬今村大地高田智史小川佳彦
Owner PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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