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Generation method as well as positioning method and device of time-division code-division orthogonal frequency division multiplexed signals

An orthogonal frequency division and signal multiplexing technology, which is applied in the field of communication, can solve the problems of poor cross-correlation suppression characteristics and poor positioning accuracy of positioning methods, so as to improve cross-correlation suppression characteristics, cross-correlation interference suppression, and increase The effect of the relevant integral result

Active Publication Date: 2012-10-10
BEIJING UNIV OF POSTS & TELECOMM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: the cross-correlation suppression characteristic in the positioning method is poor, so the positioning accuracy is poor

Method used

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  • Generation method as well as positioning method and device of time-division code-division orthogonal frequency division multiplexed signals
  • Generation method as well as positioning method and device of time-division code-division orthogonal frequency division multiplexed signals
  • Generation method as well as positioning method and device of time-division code-division orthogonal frequency division multiplexed signals

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Embodiment 1

[0048] see figure 2 , the present embodiment provides a method for generating a TC-OFDM signal, the method comprising:

[0049] Step 101: receiving a data stream, performing forward error correction coding and OFDM modulation on the data stream, generating an OFDM signal, and generating a first spreading code;

[0050] Step 102: Obtain the second spreading code, and superimpose the OFDM signal with multiple second spreading codes to obtain the overlapping OFDM spreading code, the second spreading code is an N-bit GOLD code, and N is greater than or equal to 511;

[0051] Step 103: Generate a TC-OFDM signal according to the first spreading code and the overlapping OFDM spreading code.

[0052] The method provided by this embodiment increases the correlation integral result, improves the cross-correlation suppression characteristic of the TC-OFDM signal, and simultaneously improves positioning accuracy.

Embodiment 2

[0054] see image 3 , the embodiment of the present invention provides a method for generating a TC-OFDM signal, the method comprising:

[0055] 201: Receive a data stream, perform forward error correction coding and OFDM modulation on the data stream, and generate an OFDM signal;

[0056] Specifically, the input data stream is received, forward error correction coding, interleaving, and constellation mapping are performed on the data stream, and the signal after constellation mapping is multiplexed with scattered pilots and continuous pilots for OFDM modulation to generate OFDM Signal.

[0057] Performing forward error correction coding, interleaving and constellation mapping on the data stream, and performing OFDM modulation on the data stream are existing relatively mature technologies. The embodiments of the present invention will not describe it in detail. The present invention only uses BPSK (Binary Phase Shift Keying , binary phase shift keying) constellation mapping ...

Embodiment 3

[0079] see Figure 6 , this embodiment provides a device for generating a TC-OFDM signal, the device includes a code modulation module 301, a superposition module 302 and a generation module 303,

[0080] Coding and modulation module 301, configured to receive the data stream, perform forward error correction coding and OFDM modulation on the data stream, generate an OFDM signal, and generate a first spreading code;

[0081] The superposition module 302 is used to obtain the second spreading code, and superimpose the OFDM signal with a plurality of second spreading codes to obtain the spreading code of the superimposed OFDM, the second spreading code is an N-bit GOLD code, and N is greater than or equal to 511 ;

[0082] The generating module 303 is configured to obtain a superimposed OFDM spreading code according to the first spreading code generated by the encoding and modulating module 301 and the superimposing module 302, and generate a TC-OFDM signal.

[0083] Among the...

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Abstract

The invention discloses a generation method as well as a positioning method and device of time-division code-division orthogonal frequency division multiplexed signals, and belongs to the field of communication. The method comprises the following steps: receiving a data stream, performing forward error correction coding and OFDM (orthogonal frequency division multiplexing) modulation on the data stream, generating OFDM signals, and generating first spreading codes; getting second spreading codes with the code length which is not less than 511 bits, and superimposing the OFDM signals with a plurality of the second spreading codes to get superimposed OFDM spreading codes; and generating TC (time division and code division)-OFDM signals according to the first spreading codes and the superimposed OFDM spreading codes. According to the method disclosed by the invention, the GOLD codes with the code length which is not less than 511 bits are utilized for correlation integration of a 25ms time slot, the correlation integration result is increased, the cross correlation suppression property of broadcast positioning signals is improved and the positioning precision is improved. Furthermore, through frequency division operation, the property of suppressing cross correlation interference of the generated positioning signals is jointly decided by two factors, the suppression of the cross correlation interference can be well improved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a generation method, a positioning method and a device for a TDMA CDMA-Orthogonal Frequency Division Multiplexing (TC-OFDM) signal. Background technique [0002] In recent years, the advancement of radio technology and wireless local area network technology and the increase in demand for positioning services have vigorously promoted the development of positioning technology, and people's demand for accurate indoor positioning is also increasing day by day, especially in emergency situations. important. [0003] Existing positioning methods based on mobile multimedia broadcasting networks, such as figure 1 As shown, when generating the broadcast positioning signal, the GOLD code with a period of 511 bits is used as the spreading code, and its code rate is 5M chips / second. The terminal part is a 511-bit GOLD code of 102.2us plus a guard interval of 33.8us, a total of 136us , the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 邓中亮田向伟袁协余彦培刘晓艳张宇李序
Owner BEIJING UNIV OF POSTS & TELECOMM
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