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A method to improve system performance based on cyclic prefix (cp)

A cyclic prefix and system performance technology, applied in the field of communication, can solve the problems of low system information reception performance and effective information discarding, and achieve the effect of improving system performance

Inactive Publication Date: 2018-03-09
SHANGHAI YIJIA ELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem in the above-mentioned prior art that effective information is discarded, resulting in low performance of system information reception, and to provide a method that can extract the amount of discarded information, thereby improving the reception performance of the system

Method used

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  • A method to improve system performance based on cyclic prefix (cp)
  • A method to improve system performance based on cyclic prefix (cp)
  • A method to improve system performance based on cyclic prefix (cp)

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Embodiment Construction

[0021] The present invention is a method for improving system performance based on a cyclic prefix (CP). An embodiment of the present invention will be described in detail below taking an OFDM system as an example.

[0022] Assuming that the data sent by the system is x(n), where the valid signal part 2 is expressed as d(n) with a length of L, and the cyclic prefix part 1 is expressed as c(n) with a length of S, then by figure 1 It can be seen that c(n)=d(L-n-1), n=0,..., S-1.

[0023] Such as figure 2 As shown, assuming that the channel is h(n), the received signal y(n) can be expressed as:

[0024]

[0025] in Represents convolution, w(n) is Gaussian white noise.

[0026] h(n) is expressed as:

[0027]

[0028] in is the amplitude corresponding to each multipath in the channel, is the phase corresponding to each multipath, is the delay corresponding to each multipath;

[0029] Through timing processing, a certain position within the range of redundant info...

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Abstract

The invention discloses a method for improving the system performance based on a CP. The method comprises the following steps that a receiving end receives signals sent by a sending end; the received signals are processed regularly through multiple paths; diversity processing is carried out on the signals regularly processed through the multiple paths; the signals after diversity processing are output. The received signals are processed regularly through the multiple paths, the regular processing positions of the two paths are the most significant end and the least significant end of redundant information, then diversity processing is carried out on the signals processed regularly, the method can extract useful information content from the redundant information, received data of a system obtain gains, and the system performance is improved.

Description

technical field [0001] The invention relates to the technical field of communications, in particular to a method for improving system performance based on a cyclic prefix (CP). Background technique [0002] With the development of communication technology, the requirements for the quality of information transmission are increasing. In order to effectively combat Inter-Symbol Interference (ISI) during high-speed transmission, professional technicians have proposed Orthogonal Frequency Division Multiplexing (OFDM) technology. OFDM divides the channel into many orthogonal sub-channels, each channel remains orthogonal, and the spectrum overlaps with each other, which improves the spectrum utilization rate. The OFDM symbol is periodically extended, and the last L samples of each symbol are copied to the front of the symbol to form a cycle. Prefix (Cyclic Prefix, CP), which greatly reduces the sensitivity of the OFDM system to synchronization errors, and can effectively resist mu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L27/26
Inventor 宋伯炜汪园香
Owner SHANGHAI YIJIA ELECTRONICS TECH CO LTD
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