Multi-cast and unicast compatible orthogonal frequency division and time division multiplexing transmission, receiving machine and its method

An orthogonal frequency division and time division multiplexing technology, applied in the field of receivers and transmitters, can solve problems such as spectrum out-of-band leakage

Inactive Publication Date: 2007-10-17
SHANGHAI RES CENT FOR WIRELESS COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a multicast unicast compatible OFDM transmitter, receiver and its transmitting and receiving methods to solve the technical problem of serious out-of-band leakage of frequency spectrum

Method used

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  • Multi-cast and unicast compatible orthogonal frequency division and time division multiplexing transmission, receiving machine and its method
  • Multi-cast and unicast compatible orthogonal frequency division and time division multiplexing transmission, receiving machine and its method
  • Multi-cast and unicast compatible orthogonal frequency division and time division multiplexing transmission, receiving machine and its method

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Embodiment Construction

[0045] Fig. 1 shows a block diagram of an OFDM transmitter according to a specific embodiment of the present invention. It includes a serial-to-parallel conversion device 11, a subcarrier mapping device 12, an inverse Fourier transform (IDFT) device 13, a parallel-to-serial conversion device 14, a data block multiplexing device 15, a guard interval adding device 16 and a shaping Filtering means 17. It should be noted that the channel coding device, digital modulation device, digital-to-analog conversion device, RF frequency conversion device and transmitting antenna, which are essential components of the digital communication system transmitter, are not directly related to the purpose of the present invention and are not described here.

[0046] assume {a k , k=0,1,2...} is the digital modulation symbol sequence of input wireless transmitter, below with reference to Fig. 1, wireless transmitter of the present invention is described in detail:

[0047] Serial / parallel convers...

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Abstract

The present invention provides a unicast and multicast orthogonal frequency and time division multiplex emitter including: a inverse Fourier transform device, a data block multiplexing device, a protective gap adding device and also includes a sub-carrier mapping device positioned before the inverse Fourier transform device for mapping each element in the symbol data block to the corresponding effective carrier in the inverse Fourier transform device to transmit and 0 is transmitted to the sub-carrier having no data mapping; and a forming filter device positioned after the protective gap adding device for performing a form filtering to the OFTDM signal wave to be sent according to the frequency spectrum module. Said forming filter is an over-sampling FIR filter for satisfying the requirement of the leak of out-off-band frequency spectrum of the system. The present invention can solve the technique problem of the leak of out-off-band frequency spectrum of the system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a transmitter, a receiver, and a transmitting and receiving method thereof. Background technique [0002] Currently, the signal transmission technologies of broadband mobile communications are mainly single-carrier technology represented by CDMA (Code Division Multiple Access) and multi-carrier technology represented by OFDM (Orthogonal Frequency Division Multiplexing). In the future, broadband wireless communication will develop in the direction of broadband wireless and wireless broadband. In the broadband wireless communication environment, in order to compensate the influence of channel fading, the equalizer at the receiving end of the CDMA-based single-carrier transmission system is increasingly complex, thus limiting the application of this technology. The multi-carrier system represented by OFDM (Orthogonal Frequency Division Multiplexing) has the advantages ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04L27/26
Inventor 李明齐张小东周斌李元杰
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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