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Method for controlling bit after frame end insertion in OFDM communication system

A technology for controlling bits and bits, which is applied in the field of wireless communication systems, can solve problems such as different bit error rates, and achieve the effect of simple methods

Inactive Publication Date: 2008-08-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] By analyzing the principle of OFDM, it can be known that due to the use of OFDM technology, data transmission on subcarriers of different frequencies may lead to different bit error rates.

Method used

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  • Method for controlling bit after frame end insertion in OFDM communication system
  • Method for controlling bit after frame end insertion in OFDM communication system
  • Method for controlling bit after frame end insertion in OFDM communication system

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Embodiment Construction

[0038] Such as image 3 , Figure 4 , assuming that the i-th frame has K slots, slot K has M OFDM symbols, and the last OFDM symbol M has N bits: b 1 , b 2 ...b N (b 1 first to arrive, b N finally reached). If the control information of the i-th frame has y bits, then when the data stream arrives, use the bit insertion technology to insert the y-bit control information into b N-y+1 ...b N These bits, and then these system information control bits are mapped (2) and put into the subcarrier symbol with the lowest frequency (d 1 )superior( image 3 , Figure 4 , the subcarrier symbol d 1 has the lowest frequency, d 2 Secondly, ...,d M highest frequency. ); if the subcarrier symbol (d 1 ) cannot hold the system information control bits, and the remaining system information control bits are placed in the subcarrier symbols with the second lowest frequency (d 2 ) on, ..., and so on.

[0039] Among them, bit insertion technology and symbol mapping technology are matur...

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Abstract

The invention discloses a process for inserting control byte in the frame end of an OFDM communication system characterized by that, inserting the system information byte into the byte bit of the last OFDM which arrives last, then mapping the control information byte to the sub-carrier wave signal of the lowest frequency possible. The process stipulates the inserting position of the system control information byte and the mapped sub-carrier wave signal, warranting a relative short time delay and low code error rate in the transmission process. The invention can be used in the field of mobile communication system and wireless local area network based on OFDM.

Description

technical field [0001] The invention can be applied to the field of wireless communication, such as mobile communication, wireless local area network, etc., especially the wireless communication system adopting OFDM (orthogonal frequency division multiplexing) technology. Background technique [0002] OFDM technology is to divide a group of high-rate information data into multiple channels, and modulate them onto a group of subcarriers that are orthogonal to each other for transmission (for an overview of OFDM, see Vijaya Chandran Ramasami, "Orthogonal Frequency Division Multiplexing"). Because OFDM technology has the advantage of anti-multipath delay extension, OFDM technology will be widely used in future high transmission rate communication systems. [0003] A general OFDM model such as figure 1 (See William Y. Zhou, Yiyan Wu, "COFDM: An Overview", IEEE Transactions on Broadcasting, Vol. 41, No. 1, March 1995). From figure 1 It can be seen that: after the input data un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J11/00
Inventor 唐友喜潘春锦李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA