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OFDM transmission method, which is intended both for sporadic and for continuous data communication, for a wlan

A transmission method and time index technology, applied in wireless communication, digital transmission system, transmission system, etc., can solve the problem of large time delay, and achieve the effect of fast and accurate frame synchronization

Active Publication Date: 2006-05-24
LANTIQ BET GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, it can be determined that the delay and implementation complexity associated with this is related to the channel tracking accuracy, i.e. the higher the channel tracking accuracy, the greater the implementation complexity and the greater the time delay

Method used

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  • OFDM transmission method, which is intended both for sporadic and for continuous data communication, for a wlan
  • OFDM transmission method, which is intended both for sporadic and for continuous data communication, for a wlan
  • OFDM transmission method, which is intended both for sporadic and for continuous data communication, for a wlan

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Embodiment Construction

[0042] It has been explained above with reference to the prior art figure 1 and figure 2 .

[0043] As described below, image 3 The packet header of an exemplary embodiment based on the transmission method of the present invention is described. The header starts with figure 1 It is based on the header for the WLAN standard IEEE-802.11a described in . The packet header includes a first part 4 with a short segment (duration 0.4 μs) and a second part 7 with two long segments (duration 3.2 μs). The first part 4 of the packet header contains N=18 short segments. Fragments annotated with B or B each contain multiple sample values. The first part 4 of the header includes a first section 5 and a second section 6 . All 10 fragments in the first section 5 are the same in this case. The first section 5 therefore operates in the same way as the first section 1 of the header of the WLAN standard IEEE-802.11a (see figure 1 ). In contrast to the first section 5, the segments of t...

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Abstract

In the OFDM-based transmission method of the present invention, the header (4, 7) of the data packet can be specified: its N header fragments (B, B) are obtained by using a multiplication sequence with a length of N elements. Fragmentally obtained by multiplying the initial fragment, which is fixed for all N header fragments. It can be stipulated for the OFDM data symbol that each of a plurality of OFDM symbols continuously transmitted in time includes at least one pilot signal, wherein each subcarrier transmitting at least one pilot signal depends on the time index of each OFDM symbol .

Description

technical field [0001] The present invention relates to a packet-oriented, OFDM (Orthogonal Frequency Division Multiplexing) based transmission method for WLAN (Wireless Local Area Network). Background technique [0002] In an OFDM transmission system, the transmission frequency band is subdivided into k max subcarriers, occupying each subcarrier separately by modulation, usually PSK (Phase Shift Keying) or QAM (Quadrature Amplitude Modulation). The OFDM symbols are obtained as resultant vectors modulated on the individual subcarriers. In the transmitter, based on K in the time domain max The OFDM symbols (which are effective in the frequency domain) are transformed by an inverse fast Fourier transform (also known as IFFT) of subcarriers. In the receiver, the k max One or more time signal samples are transformed into the frequency domain and demodulated there (PSK or QAM demodulation). [0003] A known OFDM transmission standard is the WLAN standard IEEE-802.11a. In th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L5/06H04L25/0204H04L25/0224H04W28/06H04W48/08H04W56/00H04W74/02H04W84/12
Inventor S·费希特尔
Owner LANTIQ BET GMBH & CO KG
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