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Preamble generator for a multiband OFDM transceiver

A technology of preamble and orthogonal frequency division, which is applied in the field of preamble detector and preamble generator, and can solve problems such as error detection, packet loss, and collision

Active Publication Date: 2010-10-06
LANTIQ BET GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This situation may lead to packet loss when operating the network simultaneously, as some symbols may collide and be falsely detected

Method used

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  • Preamble generator for a multiband OFDM transceiver
  • Preamble generator for a multiband OFDM transceiver
  • Preamble generator for a multiband OFDM transceiver

Examples

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Embodiment Construction

[0075] From Figure 6 It can be seen that a transceiver 1 for wireless local area (WLAN) comprises a transmitter and a receiver, the transceiver 1 comprising a preamble generator according to the invention.

[0076] The transmitter converts packets of data information from higher communication layers into RF (radio frequency) signals. The transceiver's receiver extracts packet information from the received RF signal.

[0077] From Figure 6 It can be seen that the transmitter included in the transceiver 1 according to the invention comprises the following elements. The transmitter includes an encoder and modulation unit 3 that encodes the data bits received from the higher communication layer control unit 2 by adding redundant bits, and modulates the digital data signal, thereby generating time-domain sampled signals. In a preferred embodiment, the time-domain sampled signal is a dual signal or a complex signal. Coding and modulation unit 3 supplies complex signal (I+iQ) t...

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Abstract

Preamble generator for a multiband frequency division multplexing (OFDM) tranceiver of a wireless personal area network (WPAN) being switchable between a time frequency interleaving (TFI)-mode wherein data packets are transmitted by said transceiver in different frequency bands according to a predetermined frequency hopping pattern and a fixed frequency interleaving (FFI) mode wherein data packets are transmitted by the transceiver in at least one fixed frequency band, wherein said preamble generator scrambles in the fixed frequency interleaving (FFI) mode a predetermined preamble of the datapackets by multiplying said preamble with a pseudo random data sequence to flatten a power spectrum of said preamble.

Description

technical field [0001] The present invention relates generally to a transceiver for a wireless local area network (WLAN) operating simultaneously with other wireless local area networks (WLAN) in the same local area, and in particular to a preamble generator and a preamble for said transceiver. sync code detector. Background technique [0002] figure 1 Data transmission in a wireless system according to the prior art is shown. Several transceivers belonging to the same wireless local area network (WLAN) use the same data transmission channel by time sharing. At any given moment, only one transceiver is transmitting. Therefore, transmissions from each transceiver appear in bursts. To assist the receiving transceiver in identifying the data transmission burst, and in order to extract the transmitted information data, the transmitting transceiver sends a predefined preamble signal before the data portion of the data transmission burst. A transceiver receiving a data transm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04J13/06H04L12/28H04B1/713H04J11/00H04J13/00H04L5/02H04L12/56H04L25/03
CPCH04W99/00H04B2001/71563H04W84/12H04L27/2613H04L5/0096H04L25/03866H04L5/0007
Inventor 约西·埃利克阿萨夫·古雷维特兹埃亚·霍赫多夫
Owner LANTIQ BET GMBH & CO KG
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