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Preamble generator for a multiband OFDM transceiver

A technology of preamble and frequency division multiplexing, which is applied in the direction of orthogonal multiplexing system, multi-frequency code system, multiplexing communication, etc., and can solve problems such as collision, packet loss, and error detection

Active Publication Date: 2005-11-16
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

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Embodiment Construction

[0075] As can be seen from FIG. 6, a transceiver 1 for a wireless local area network (WLAN) includes a transmitter and a receiver, and the transceiver 1 includes a preamble generator according to the present 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] As can be seen from Fig. 6, the transmitter included in the transceiver 1 according to the present invention includes the following units. 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 (...

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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 data packets 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 shows data transmission in a wireless system according to the prior art. 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 transmissi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/713H04J11/00H04J13/00H04L5/02H04L12/28H04L12/56H04L25/03H04L27/26
CPCH04L5/0007H04L27/2613H04B2001/71563H04L5/0096H04L25/03866H04W99/00H04W84/12
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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