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Orthogonal frequency division multiplexing (OFDM)-transform domain communication system (TDCS) signal transmission and receiving methods, devices and system

A technology of OFDM-TDCS and communication system, which is applied in the field of device and system, signal transmission and reception method of Orthogonal Frequency Division Multiplexing transform domain communication system, and can solve application limitations, low efficiency of OFDM-TDCS system, low signal-to-noise ratio, etc. problem, to achieve the effect of reducing the impact of deep fading, good anti-multipath and anti-fading ability, and improving performance gain

Inactive Publication Date: 2011-06-22
HUAWEI TECH CO LTD +1
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Problems solved by technology

[0005] OFDM-TCDS works in a mobile environment where the signal-to-noise ratio is extremely low, and the transceiver is used in a non-continuous or inconsistent spectrum. Under such harsh conditions, channel estimation is a very difficult problem that must be solved, and existing The OFDM-TCDS obtains the bit error rate (Bit ErrorRate, BER) performance gain by reducing the data rate, the efficiency of the OFDM-TDCS system is not high, and the application is limited

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  • Orthogonal frequency division multiplexing (OFDM)-transform domain communication system (TDCS) signal transmission and receiving methods, devices and system
  • Orthogonal frequency division multiplexing (OFDM)-transform domain communication system (TDCS) signal transmission and receiving methods, devices and system
  • Orthogonal frequency division multiplexing (OFDM)-transform domain communication system (TDCS) signal transmission and receiving methods, devices and system

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Embodiment Construction

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. It should be understood that the described embodiments are only some of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0042] An embodiment of the present invention provides an OFDM-TCDS transmitter, such as figure 1 As shown, the transmitter includes: an encoding unit 10, an interleaving unit 11, a framing unit 12, a cyclic code shift keying (CCSK, Cyclic Code Shift Keying) modulation unit 13 and an OFDM transmitting unit 14;

[0043]The coding unit 10 is configured to perform channel coding on a signal to be transmitted. In an embodim...

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Abstract

The embodiment of the invention relates to an orthogonal frequency division multiplexing (OFDM)-transform domain communication system (TDCS) signal transmission method, an OFDM-TDCS signal transmitter, an OFDM-TDCS signal receiving method, an OFDM-TDCS signal receiver, and a system. The signal receiver performs channel estimation and data symbol detection for the first time on each original frame of a received signal, performs a posterior probability (APP) decoding on the extrinsic information of bits of a complete coded data block, and performs iterative channel estimation and data symbol detection by utilizing an extended frame according to a prior probability log ratio of the bits fed back by the APP decoding to obtain an OFDM-TDCS channel estimation result and a data symbol detection result. The embodiment of the invention reduces a mean square error (MSE) of the channel estimation by using an iterative channel estimation technology, has relatively higher anti-multipath performance and relatively higher anti-fading performance, and enables a coded OFDM-TDCS to reliably transmit data at an extremely low signal to noise ratio and under the cognitive radio (CR) condition of discontinuous or inconsistent frequency spectrums used by the transmitter and the receiver.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to an Orthogonal Frequency Division Multiplexing-Transform Domain Communication System (Orthogonal Frequency Division Multiplexing-Transform Domain Communication System, OFDM-TCDS) signal sending and receiving method, device and system. Background technique [0002] Cognitive Radio (CR) technology has become a very promising technology to solve the current shortage of wireless spectrum resources. The CR system with environmental adaptability adjusts system parameters by sensing the dynamically changing spectrum environment without interfering with In the case of authorized users, wireless spectrum resources are shared, thereby effectively improving the utilization rate of spectrum resources. [0003] Transform Domain Communication System (TDCS) is considered as a transceiver candidate for cognitive radio technology. The basic idea of ​​TDCS is to avoid interference w...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/02H04L1/00
Inventor 黄彪王军唐万斌李少谦陈磊
Owner HUAWEI TECH CO LTD
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