Sequence allocation method and device

A sequence and sequence group technology, applied in the field of communication sequence allocation, can solve problems such as strong interference and interference effects, and achieve the effects of small interference, reducing strong interference, and reducing complexity

Active Publication Date: 2008-09-10
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the user's data bandwidth often has different bandwidths and locations at different times according to certain scheduling rules. Therefore, the way the reference signal sequences of different cells occupy time-frequency resources will also change from time to time, resulting in different interference between cells. Effect of Length Serial Correlation
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Method used

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  • Sequence allocation method and device

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specific Embodiment approach 1

[0040] In a specific embodiment of the present invention, the system assigns sequence groups to cells, wherein the sequences in each sequence group are divided into several subgroups; each subgroup corresponds to a time-frequency resource occupation mode, and how many time-frequency resources are there in the communication system? There are as many subgroups as there are resources occupied; the sequences in each subgroup are selected from the set of candidate sequences corresponding to the subgroup according to certain rules. The user or the channel selects the sequence in the corresponding sequence subgroup to transmit or receive according to the allocated sequence group and the specific time-frequency resource occupancy mode of the transmitted signal adopted.

[0041] The specific rules above are: for any subgroup m, determine the function f corresponding to a subgroup m (·), the domain of this function is the candidate sequence set corresponding to the subgroup; where the f...

specific Embodiment approach 2

[0073] Consistent with the above-mentioned method in which the network assigns sequence groups to cells according to certain rules, a communication sequence transmission method is introduced below, refer to image 3 , the specific process is:

[0074] Step 201 receives the group number k of the sequence group assigned by the system.

[0075] Step 202 makes the function d(f m (·), G k ) in the value of the smallest, second smallest, and smaller n sequences constitute the sequence in the subgroup m in the sequence group k, where n is a natural number dependent on m, where m is the sequence number of the subgroup, d(a, b) is a binary function, G k is a quantity determined by the group number k, the function f m (·) is a function corresponding to the subgroup m determined by the system, and the domain of this function is the set of candidate sequences corresponding to the subgroup m.

[0076] Step 203 generates a corresponding sequence according to the composed sequence and t...

specific Embodiment approach 3

[0080] The following provides a transmitting device that applies the above sequence transmitting method, refer to Figure 5 , the device consists of:

[0081] Sequence selection unit: used to receive the group number k of the sequence group assigned by the system, and make the function d(f m (·), G k ) in the value of the smallest, second smallest, and smaller n sequences constitute the sequence in the subgroup m in the sequence group k, where m is the sequence number of the subgroup, and n is a natural number dependent on m, where d(a, b) is a binary function, k is the group number of the sequence group, G k is a quantity determined by the group number k, the function f m (·) is a function corresponding to the subgroup m determined by the system, and the domain of this function is the set of candidate sequences corresponding to the subgroup m.

[0082] A sequence transmitting unit: used to select or generate a corresponding sequence according to the constructed sequence, ...

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Abstract

The invention provides a sequence distribution method and a corresponding sequence transmitting and receiving method and a device thereof. Sequences in each sequence group are divided into a plurality of subgroups; the sequences in each subgroup are obtained by being selected from a candidate sequence set corresponding to the subgroup according to certain rules; the determined sequences are allocated to a subarea by the system. As for the subgroup m, a function fm(question mark) corresponding to the subgroup is determined and the definition domain of the function is the candidate sequence set corresponding to the subgroup; wherein, the sequences in the subgroup m of the sequence group k are determined by selecting n sequences in the candidate sequence set while the sequences cause values of a function d (fm (question mark), Gk) to be smaller, wherein, k is a group number of the sequence group, m is a sequence number of the subgroup, n is a natural number depending on m, d(a, b) is a binary function and Gk is a value determined by the group number k. The occurrence of the sequence highly correlative to a certain length of the sequence can be avoided in other sequence groups, thus reducing strong interference. No tables for storing the large-scale sequence group are required, thus the complexity of the system is reduced.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a communication sequence allocation technology. Background technique [0002] In a communication system, a constant amplitude zero auto-correlation sequence (CAZAC, constant amplitude zero auto-correlate) sequence is a very important communication resource. Its characteristics are specifically: [0003] ■ The modulus of the amplitude is a constant value, for example, it can be normalized to 1. [0004] ■Zero-period autocorrelation, except for the maximum correlation with itself, other cyclic shift autocorrelations of the sequence itself are zero. [0005] Due to its above-mentioned properties, the sequence in the frequency domain is also a CAZAC sequence after Fourier transform. Such characteristics are especially suitable for use as a reference signal in communication, for channel estimation, and so on. [0006] For example, in a single carrier frequency division multip...

Claims

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Application Information

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IPC IPC(8): H04Q7/36H04B1/707H04L27/26
Inventor 曲秉玉何玉娟
Owner HUAWEI TECH CO LTD
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