Estimation of data transmission channel
A technology of channel estimation and channel impulse response, applied in the direction of baseband system components, etc.
Inactive Publication Date: 2012-05-23
温炳华
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It can quickly and accurately obtain channel parameters, and solve some problems in existing corresponding technologies, such as long training time, slow convergence, complex algorithm, and poor precision.
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[0073] The transmission system can be one-dimensional or two-dimensional. For the sake of simplicity, one-dimensional is used as an example to describe the implementation mode. In the two-dimensional case, the two-dimensional formula described above can be used.
[0074] Step 1 Design and arrange the sending training sequence at the sending end. The first condition for data transmission channel estimation is to design correct training sequence at the sending end. It must form positive and negative transmission data at the symbol rate (or modulation rate). In order to facilitate calculation and operation at the receiving end, the number of symbols in each segment is set to be the same, and the number of symbols in each segment is an odd number. , and start with a positive value and end with a positive value. The amplitude of the symbol in all training sequences is 1, that is, each segment of the entire sequence is alternated with ±1. In fact, this forms a repeating cycle seque...
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The invention discloses a simple and effective method for estimating a data transmission channel, which belongs to the technical field of digital information transmission. The method adopts the technical scheme that a sending end sends a training sequence and a receiving end calculates received data of the training sequence so as to obtain a channel parameter. Specifically, the training sequence consisting of a plurality of data segments is sent from the sending end, and each data segment consists of simple alternate positive and negative code groups; simple calculations of pairwise adding adjacent received data in the training sequence, and the like are carried out at the receiving end so as to accurately obtain a channel pulse response; and a tapping coefficient of a time-domain equalizer can be conveniently calculated according to a channel parameter so as to realize the equilibrium so that intersymbol interferences caused by channel transmission is effectively reduced. The tappingcoefficient of the equalizer is once set without gradual and iterative adjustments, thus equalization is easy to realize. The method has strong equalization capacity without requirements on initial distortion, simple algorithm, less operand and easy realization and can also conveniently calculate residual distortion output by the equalizer and guarantee the accuracy of the received data in a modeof carrying out series connection and then equalization, thus the equalization quality is high. The method can also be applied to echo counteraction.
Description
technical field [0001] The invention relates to the technical field of digital information transmission. In particular it relates to channel estimation in data communication systems. Background technique [0002] In data communication devices that have been widely used, due to the existence of transmission media, receiving data will inevitably generate inter-symbol interference (ISI). Modems ranging from low-speed voice bands to high-speed broadband Internet devices (such as television networks) all need to have an equalizer that compensates for the transmission medium to improve data transmission quality and reduce bit error rates. In order to achieve the equalization of the transmission channel, it is necessary to know the characteristics of the channel, that is, the impulse response of the channel. A time-domain signal in a data transmission system can be represented as follows [0003] S ( t ) ⊗ ...
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IPC IPC(8): H04L25/02
Inventor 温炳华
Owner 温炳华