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Time- and frequency-domain unified single carrier modulation signal transmission method

A single-carrier modulation and signal transmission technology, applied in the field of digital information transmission, can solve problems such as high algorithm complexity, difficult synchronization, channel estimation and equalization, etc., and achieve accurate channel response estimation, excellent performance, and low complexity Effect

Inactive Publication Date: 2011-03-16
TSINGHUA UNIV
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Problems solved by technology

Due to the unknown nature of CP, it is difficult for the SC-FDE method to use CP to perform operations such as synchronization, channel estimation, and equalization. Even if these functions can be realized, the algorithm complexity is relatively high

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  • Time- and frequency-domain unified single carrier modulation signal transmission method
  • Time- and frequency-domain unified single carrier modulation signal transmission method
  • Time- and frequency-domain unified single carrier modulation signal transmission method

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Embodiment Construction

[0044] A signal transmission method using time-frequency domain combined single-carrier modulation proposed by the present invention is described in detail in conjunction with the accompanying drawings and embodiments as follows:

[0045] The present invention adopts the single-carrier modulation technology that adds pilots in the time domain, but uses the pilots in the frequency domain to perform operations such as synchronization, channel estimation, and equalization to combat multipath propagation and Doppler frequency deviation in broadband wireless mobile communications. In order to solve problems such as channel fading caused by such problems, the present invention refers to this technology as Time domain and Frequency domain United-Single Carrier Modulation (hereinafter referred to as TFU-SCM) technology. TFU-SCM uses a cyclic suffix composed of a unique word (Unique Word, hereinafter referred to as UW) as a guard interval, and a special training sequence composed of one...

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Abstract

The invention relates to a time- and frequency-domain unified single carrier modulation (TFU-SCM) signal transmission method, and belongs to the technical field of digital information transmission. The method comprises that: information generated by a sending end is subjected to source coding, channel coding and constellation mapping in turn to form mapped information; the mapped information is subjected to time- and frequency-domain unified single carrier modulation FU-SCM modulation, and a plurality of modulated symbols form a frame signal to be sent; the received frame signal is split into a TFU-SCM modulation symbols in a corresponding composition mode; and the modulation symbols are subjected to TFU-SCM demodulation to form serial data, and the serial data is subjected to constellation inverse mapping, channel decoding and source decoding in turn to form the original information. The method maintains the advantage of low complexity of the sending end of the single carrier frequency domain equalization (SC-FDE) technology, the number of UW in the pilot frequency can be flexibly selected according to requirement on system performance, operation such as synchronization, channel estimation, balance and the like can be convenient to carry out at a receiving end by operating the pilot frequency in the frequency domain, the processing efficiency of the system is improved, and the method is more suitable for a broadband wireless mobile communication system.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, and in particular relates to a single-carrier modulation technology in a broadband wireless mobile communication system. Background technique [0002] In a broadband wireless mobile communication system, the transmitted signal is often affected by occlusion, absorption, reflection, refraction and diffraction caused by various objects in the environment during the propagation process, forming multiple path signal components to reach the receiver. The signal components of different paths have different propagation delays, phases and amplitudes, and channel noise is added, and their superposition will make the composite signal cancel or enhance each other, resulting in severe fading. This fading will distort the received signal of the receiver and reduce the reliability of communication. In addition, if the transmitter or the receiver is in a relatively moving state, the re...

Claims

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Application Information

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IPC IPC(8): H04L27/00H04L25/02H04L25/03H04B1/69
Inventor 粟欣康登榜曾捷徐翼王海军高晖张长赵玉瑶
Owner TSINGHUA UNIV
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