Low complexity channel estimation method based on orthogonal sequence design

A channel estimation and low-complexity technology, applied in the field of MIMO-OFDM communication, can solve the problems of time-varying channel performance loss, signal-to-noise ratio loss, performance loss, etc., and achieve training sequence design and channel estimation methods that are simple and feasible, The effect of improved bit error rate performance and stable performance

Inactive Publication Date: 2006-09-20
PLA UNIV OF SCI & TECH
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Problems solved by technology

This method is simple to implement, but there are two inherent defects: one is that this method needs to transmit multiple continuous OFDM symbols, and in mobile time-varying channels, the channel information reflected in some transmission periods cannot reflect the continuous OFDM The symbols correspond to the frequency domain response statistics on the pilot subcarriers; the second is that each antenna selects different subcarriers to transmit pilots at the same time period, although mutual interference is avoided, it also leads to the loss of signal-to-noise ratio. N t When there are two transmitting antennas, it will cause a loss of 10log in the signal-to-noise ratio 10 N t dB
[0005] In addition, G.L.St¨uber

Method used

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  • Low complexity channel estimation method based on orthogonal sequence design
  • Low complexity channel estimation method based on orthogonal sequence design
  • Low complexity channel estimation method based on orthogonal sequence design

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Embodiment

[0057] We take a MIMO-OFDM system with 4 transmitting antennas and 4 receiving antennas as an example to illustrate how to transmit training sequences and the corresponding channel estimation method at the receiving end. The total number of subcarriers of OFDM N=1024, CP length L CP =216, the number of effective subcarriers is 884, there are 70 virtual carriers for low frequency and 70 virtual carriers for high frequency, and the serial numbers of the subcarriers where the training sequence is located are 70, 74, ..., 954, and the power distribution is equal. According to the previous design method, at the transmitting end, the training sequences on the four transmitting antennas are

[0058] 1 e 1 · jπ 256 · ...

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Abstract

The method is used in MIMO-OFDM system having virtual carrier and comprises: the designed orthogonal training sequence is distributed in equal interval in valid sub-carrier on each transmitting antenna; they are pair-wise orthogonal and the rest is filled zero; the transmitting end intercepts a section from the time domain symbol obtained from inverse fast Fourier transform, adds a cycle prefix on it and then transmits it through antenna; the receiving end makes self-copy for the received time domain symbol and then converts it to a frequency domain symbol; the fast Fourier transform, over-sampling and the finite impulse response low-pass interpolating filer are used to make low complexity channel estimation.

Description

technical field [0001] The invention belongs to the technical field of MIMO-OFDM (Multiple-Input Multiple-Output-Orthogonal Frequency Division Multiplexing) communication, and in particular relates to a low-complexity channel estimation method based on orthogonal sequence design. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology has attracted more and more attention due to its high spectrum utilization rate and low implementation complexity. Since the 1980s, OFDM technology has not only been widely used in broadcast digital audio and video fields, but also has become a part of the wireless local area network standard. With the increase of people's demand for communication data, broadband, personalization and mobility, OFDM technology has been applied in many high-speed information transmission fields. At present, people are considering using OFDM technology in the next generation wireless c...

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Application Information

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IPC IPC(8): H04L25/02
Inventor 李子蔡跃明徐友云杨炜伟缪晖徐信
Owner PLA UNIV OF SCI & TECH
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