Unlock instant, AI-driven research and patent intelligence for your innovation.

Orthogonal frequency division multiplex (OFDM) data packet detecting unit and method of detecting an OFDM data packet

A detection unit, multiplexing technology, applied in the field of communication systems, can solve the problems of waste, failure to find errors, association errors, etc.

Inactive Publication Date: 2007-05-09
TEXAS INSTR INC
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it happens that an invalid data packet is detected, there will be a 25% probability that the OFDM receiver will not be able to detect errors in the fields of the ODFM signal, wasting its computational resources processing the invalid data packet and transmits the decoded packet to a Media Access Controller (MAC), which then has to waste its resources determining that the packet is invalid
Not only is the receiver wasting its resources processing invalid packets, but this processing can cause the receiver to miss a valid OFDM packet and can further cause the MAC to report a such error associated with the invalid packet

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Orthogonal frequency division multiplex (OFDM) data packet detecting unit and method of detecting an OFDM data packet
  • Orthogonal frequency division multiplex (OFDM) data packet detecting unit and method of detecting an OFDM data packet
  • Orthogonal frequency division multiplex (OFDM) data packet detecting unit and method of detecting an OFDM data packet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] Referring first to FIG. 1, there is illustrated a system diagram of one embodiment of an OFDM transmitter / receiver pair, generally designated 100, constructed in accordance with the principles of the present invention. OFDM transmitter / receiver pair 100 includes an OFDM transmitter 105 and an OFDM receiver 130 . The OFDM transmitter 105 includes a transmitter input 106 , a transmitter input section 110 , a transmitter transformation section 115 , a transmitter output section 120 and a transmit antenna 124 . OFDM receiver 130 includes a receive antenna 131 , a receiver input section 135 , an FFT section 140 , a receiver output section 145 and a receiver output 148 .

[0016] The transmitter input section 110 includes a transmit forward error correction (FEC) stage 111 and a quadrature amplitude modulation (QAM) mapper stage 112 coupled to the transmitter input 106 . The transmitter transform section 115 includes an N-point inverse fast Fourier transform (IFFT) stage 116...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention provides an orthogonal frequency division multiplex (OFDM) packet detect unit. In one embodiment, the OFDM packet detect unit includes a correlation indicator configured to cross-correlate a received symbol and a stored standard symbol to yield a correlation result. Additionally, the OFDM packet detect unit also includes a threshold discriminator coupled to the correlation indicator and configured to produce a packet detect signal for a fast Fourier transform (FFT) placement peak based on a comparison between the correlation result and a threshold.

Description

technical field [0001] The present invention relates generally to a communication system; and more particularly to an Orthogonal Frequency Division Multiplexing (OFDM) packet detection unit, a method for detecting OFDM packets, and a method using the The data packet detection unit or the OFDM receiver of the method. Background technique [0002] Communication systems make extensive use of digital signal processing techniques to implement increasingly advanced and complex computing algorithms. New technologies and increasing demand for products and services are driving the emergence of extended applications. In wireless mobile communications, channels often vary over time due to relative motion between transmitter and receiver and also due to multipath propagation. This change over time is called fading and can significantly impair system performance. When the data rate is high compared to the channel bandwidth, multipath propagation becomes frequency dependent and can cau...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04J1/20H04L27/10H04L27/26
CPCH04L27/2675H04L27/2656H04L27/261H04L27/2662H04J11/00H04L27/26
Inventor 蒂莫西·F·墨菲拉尔夫·E·坦普尔
Owner TEXAS INSTR INC