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Single frequency network

A single-frequency network and pilot sequence technology, applied in the field of computer programs, can solve problems such as spectral efficiency loss and achieve high relative delay effects

Active Publication Date: 2010-03-10
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

Dense pilot structure leads to spectral efficiency loss

Method used

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Embodiment Construction

[0040] figure 1 A typical layout of a single frequency network is shown, which in this embodiment has three transmitters Tx1, Tx2, Tx3 and one receiver Rx in the transmission area. All transmitters use the same frequency to send the same signal at the same time. In SFN, the composite channel needs to be estimated.

[0041] In the DVB-T system, every 12 subcarriers of each OFDM symbol has a pilot subcarrier for channel estimation. according to figure 2 The depicted OFDM symbol index while assigning pilots to different subcarriers, figure 2 A diagram showing a time-frequency plane showing the pilots used in DVB-T / H. Black dots represent pilot subcarriers, and blank dots represent data subcarriers. If the channel is static, the pilots are interpolated in time to obtain a denser grid of pilots per OFDM symbol, with one pilot subcarrier for every three subcarriers. This very dense pilot structure is required in the case where the longest expected channel exists in the SFN. ...

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Abstract

The present invention relates to a distributed pilot scheme especially suited for single frequency networks used, for instance, for broadcasting digital TV. In current digital TV standards, e.g. DVB-T, the transmitters in the SFN transmit the exact same signal in the same frequency and at the same time. As a consequence the channel seen by the receiver is the channel created by the SFN characterized by a very long delay spread, which can be challenging to estimate. According to the present invention different, preferably orthogonal, pilot sequences are assigned to different transmitters in the same SFN so that the receiver can estimate the propagation channels from each transmitter to itself independently.

Description

technical field [0001] The present invention relates to a single frequency network comprising a plurality of transmitters located in a transmission area for simultaneously transmitting transmission signals carrying the same transmission data using the same frequency channel, so as to be transmitted by one or more transmitters located in the transmission area receiver to receive. [0002] The invention also relates to a transmitter and a receiver for use in such a single frequency network, a corresponding method, a transmission signal and a computer program for implementing said method. Background technique [0003] A single frequency network (SFN) is a network of transmitters that transmit the same signal at the same frequency and simultaneously. They are used in broadcast terrestrial standards such as, for example, the DVB-T standard. They have the advantage of allowing a frequency reuse factor of one, and the disadvantage of creating artificially long channels. The wire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/261
Inventor A·菲利皮S·瑟贝特利P·H·J·M·范沃尔图伊森
Owner TOP VICTORY INVESTMENTS
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