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Interference elimination method and device

A technology of interference elimination and interference data, which is applied in the field of communication, can solve problems such as the complexity of the implementation process, and achieve the effect of reducing complex operations and avoiding linear convolution operations

Inactive Publication Date: 2008-02-13
HUAWEI TECH CO LTD
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Problems solved by technology

[0008] It can be seen from the technical solutions of the prior art that since the sending end transmits the PN sequence in the guard interval, when the receiving end performs receiving processing, in order to eliminate the influence of the PN sequence, a linear convolution operation is required, and the implementation process is relatively complicated.

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Embodiment Construction

[0045] The first embodiment provided by the present invention is an interference elimination method, which is mainly through superposition processing to pass through the channel multipath time delay of the PN sequence to cause interference to useful data from the linear convolution between the PN sequence and the channel multipath time delay The relation is transformed into a circular convolution relation, thereby avoiding the linear convolution operation in the prior art.

[0046] Assume that N is defined as the number of subcarriers (the useful data block length), G is the guard interval length (the length of the transmitted PN sequence), and the time domain expression of the PN sequence is p(m), m=0, 1, . . . , G-1. The reception process of each received OFDM symbol at the receiving end is shown in Figure 2, as follows:

[0047] Step 1, after the receiving end receives the received signal, it first performs radio frequency processing and analog-to-digital conversion (A / D) p...

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Abstract

The invention relates to an interference clearance method and device. The core of the invention is that PN sequence after the received available data blocks is superposed to the start position of the available data blocks to ensure that the cyclic convolution relation is formed between the available block data and the multipath delay; at the same time, the interference caused by the multipath delay when PN sequence passes through the channels is considered as the cyclic convolution of the PN sequence and the multipath delay of the channels. In this way, signal of the multipath delay when PN sequence passes through the channels is directly reproduced through Fourier transform / inverse transform. Accordingly, linear convolution operation in the prior art is prevented; complicated operations during the receiving treating process are reduced so that the receiving treating process is very simple.

Description

technical field [0001] The present invention relates to the communication field, in particular to an interference elimination technology. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multplexing) technology can parallel-modulate the transmitted data symbols on multiple sub-carriers overlapping and orthogonal to each other for transmission. The OFDM technology is applicable to the transmission of high-rate data in a multipath wireless channel environment, and it has the following characteristics: [0003] On the one hand, the serial-to-parallel conversion of data symbols will increase the symbol period on each subcarrier relatively, which can minimize the impact of time dispersion caused by the multipath delay extension of the wireless channel on the system, and avoid frequency selection. On the other hand, the orthogonality between subcarriers can effectively utilize the bandwidth and improve the system capaci...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04L25/02H04L27/26H04B1/7097
Inventor 葛绍伟肖蜇水屈炳云
Owner HUAWEI TECH CO LTD
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