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A method for realizing ultra-wideband transmission of short data packets in block code ofdm system

A technology of short data packets and block codes, which is applied in the field of ultra-wideband transmission of short data packets, can solve problems such as no constraint mechanism, and achieve the effect of flexible spread spectrum schemes

Active Publication Date: 2019-08-30
南京易太可通信技术有限公司
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Problems solved by technology

Patents CN200710080146 and CN200910204164 simply repeat and phase-rotate the transmitted information. The prior art usually only considers the transmission method of simple repetition or phase-rotation for a single data, and does not combine channel coding (such as LDPC) and the specific constraints of combining OFDM technology mechanism

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  • A method for realizing ultra-wideband transmission of short data packets in block code ofdm system
  • A method for realizing ultra-wideband transmission of short data packets in block code ofdm system
  • A method for realizing ultra-wideband transmission of short data packets in block code ofdm system

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Embodiment Construction

[0038] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0039] The specific implementation method of the present invention is as follows: in the OFDM high frequency band communication system, the number N of modulation symbols that an OFDM symbol can carry s =760. The information bit sequence m length N of the short data packet to be sent 1 = 80, using LDPC encoding with a code length of 672 and a code rate of 3 / 4, the check bit sequence p length N introduced by m through LDPC encoding 2 =168. The constellation modulation is BPSK modulation, and the length of m after modulation is still N 1 The symbol sequence M of p, after constellation mapping, the length is still N 2The symbol sequence P, so that the length of the symbol sequence that needs to be sent is N 1 +N 2 =248.

[0040] At the sending end, use Barker sequences S of length 5 and 2 for M and P respectively 1 and S 2 Spread spectrum...

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Abstract

The invention discloses a design method of sending a short data packet via an ultra-wide band in an OFDM system based on block codes. At a sender, check information is introduced into a short data packet after block coding, and after constellation mapping, the original short data packet and the new short data packet are spread using a spread spectrum sequence so as to form a sending pattern of an OFDM symbol. At a receiver, the OFDM symbol after channel equalization is de-spread, and then, a soft decision is made to get log likelihood ratio soft information, and the information is input to a block coder-decoder to get the short data packet. According to the invention, an original information code word is mapped to a code set with good PAPR characteristic. Moreover, the spreading scheme is flexible, switching can be carried out between the spreading of an information symbol and the spreading of the combination of an information symbol and a check symbol according to different spreading multiples, and the method can be prompted to an application scenario in which multiple short data packets are sent via an ultra-wide band.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method for realizing ultra-wideband transmission of short data packets in a block code OFDM (Orthogonal Frequency Division Multiplexing) system. Background technique [0002] With the development of smart phone technology and wireless communication technology, more and more Internet services are transplanted to mobile phones, among which instant chat applications, microblogs, etc. are representative. The common characteristics of such services are: the length of data packets Very short, but will send packets at a higher frequency for a period of time. Since the existing wireless network is mainly aimed at long data packet services (such as video services), some problems may arise when dealing with short data packet services. [0003] OFDM technology divides the transmission bandwidth of the channel into several sub-bands, transmits data information i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L1/00H04B1/69
Inventor 何世文王文正张国玉王海明洪伟张军江华
Owner 南京易太可通信技术有限公司
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