Time-domain synchronous OFDM space-frequency coding time-frequency combination channel estimating method

A technology of orthogonal frequency division and time domain synchronization, which is applied in the field of digital information transmission and can solve the problems of increasing decoding complexity at the receiving end.

Inactive Publication Date: 2006-06-21
TSINGHUA UNIV
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Problems solved by technology

In 1998, Tarokh introduced it in "Tarokh V, Seshadri N, and Calderbank A. Space-time codes for high data rate wireless communications: performance criterion and code construction. IEEE Trans. on Information Theory, 1998, 44(2): 744-765" The concept of space-time trellis coding (STTC) is designed, which designs channel coding and antenna diversity as a whole. This method can theoretically obtain the maximum gain, but it needs to change the design of the entire transmitting system

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  • Time-domain synchronous OFDM space-frequency coding time-frequency combination channel estimating method
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  • Time-domain synchronous OFDM space-frequency coding time-frequency combination channel estimating method

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Embodiment Construction

[0085] The time-frequency joint channel estimation method of space-frequency coding in the time domain synchronous frequency division multiplexing (TDS-OFDM) system of the present invention will be described below with reference to the accompanying drawings.

[0086] First we describe the space-frequency coding method proposed in the present invention.

[0087] Orthogonal Frequency Division Multiplexing (TDS-OFDM) multi-carrier modulation with time domain synchronization is a hybrid structure of time domain and frequency domain. A signal frame is composed of two parts - frame synchronization and frame body. The baseband signal of the frame body is an Orthogonal Frequency Division Multiplexing (OFDM) block. An OFDM block can be further divided into a guard interval and a DFT block. The DFT block has 3780 samples in its time domain, which are the inverse discrete Fourier transform of 3780 subcarriers in the frequency domain.

[0088] Therefore, if the antenna diversity technol...

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Abstract

The estimation method for time-frequency joint channel in TDS-OFDM space-frequency code comprises: 1) the transmission antennas of T1 and T2 executes space-frequency diversity code; 2) for some rule, alternative transmitting the TPS information after error correction coding carried on OFDM sub-carrier; 3) taking time-frequency joint channel estimation with time-domain PN sequence and TPS information; 4) space-frequency decoding to recovery transmission information. This invention changes little to original transmitter system, simple, fast and accurate, and supports soft-failure to improve reliability.

Description

technical field [0001] The invention belongs to the field of digital information transmission, and more specifically relates to a time-frequency joint channel estimation method of space-frequency coding (Space-frequency) in a Time Domain Synchronous OFDM (TDS-OFDM) system. Background technique [0002] An important basis for terrestrial digital TV broadcasting or mobile communication is the propagation of radio waves, which propagate from transmitting antennas to receiving antennas in a variety of ways, including free space waves, tropospheric reflection waves, ionospheric waves, and ground waves. Free space waves, also known as direct waves, propagate along a straight line and are used for satellite and external space communications, as well as ground-line-of-sight propagation (for example, between two microwave towers). The troposphere, 10 miles above the Earth, is a heterogeneous medium whose reflective index decreases with altitude. Between 40 and 400 miles in the atmos...

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Application Information

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IPC IPC(8): H04L27/32H04L25/02
Inventor 杨知行杨林
Owner TSINGHUA UNIV
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