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

An orthogonal frequency division and time domain synchronization technology, applied in the field of digital information transmission, can solve the problem of increased decoding complexity at the receiving end
CN100571245CInactive Publication Date: 2009-12-16TSINGHUA UNIV
7 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2009-12-16
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a time-frequency joint channel estimation method of time-domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) space-frequency coding, which belongs to the technical field of digital information transmission. The steps are: 1) transmit antennas T1 and T2 to perform space-frequency diversity coding; 2) alternately transmit transmission parameter signaling (TPS) information carried on OFDM subcarriers on T1 and T2 according to certain rules; 3) Time-frequency joint channel estimation is performed by using time-domain PN sequence and frequency-domain TPS information; 4) Sending information is recovered through space-frequency decoding. The transmission space-frequency coding time-frequency joint channel estimation method described in the present invention hardly changes the original transmitter system, the processing method is simple, fast and accurate, maintains the transmission efficiency of the system, and supports "soft failure", increasing reliability . At the same time, the present invention does not lose its generality, and can be easily transplanted to other multi-carrier terrestrial digital television broadcasting systems.
Need to check novelty before this filing date? Find Prior Art

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More