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Channel estimation method of orthogonal frequency division multiplexing (OFDM) communication system

A technology of multiplexing communication and channel estimation, applied in the field of channel estimation of orthogonal frequency division multiplexing communication system, can solve the problems of difficult to guarantee performance, simplified LMMSE estimation method, difficult to implement, etc. Simple, stable performance

Active Publication Date: 2010-06-09
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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Problems solved by technology

However, when this technology uses LMMSE estimation, it does not simplify the LMMSE estimation method, and needs to perform matrix inversion operation, which is difficult to achieve in actual hardware operations; and low-pass filter interpolation is used at the data subcarrier , when there are many multipath components in the channel, its performance is difficult to be guaranteed, and it is even worse than the stable performance of directly using linear interpolation

Method used

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  • Channel estimation method of orthogonal frequency division multiplexing (OFDM) communication system
  • Channel estimation method of orthogonal frequency division multiplexing (OFDM) communication system
  • Channel estimation method of orthogonal frequency division multiplexing (OFDM) communication system

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Embodiment

[0033] This embodiment carries out channel estimation with reference to the physical layer downlink transmission parameters of 3GPP LTE-R8 version, the transmission bandwidth is set to 3MHz, the channel adopts COST207 RA channel, and the receiving signal-to-noise ratio is set to be 10dB, such as figure 1 shown, including the following steps:

[0034] In the first step, under different channel types and signal-to-noise ratio conditions, all interpolation coefficient values ​​in the frequency domain are obtained and stored.

[0035] The channel types are divided according to channel multipath length, including: TU channel and RA channel, wherein: the channel with channel multipath length less than 3 μs is RA channel, and the channel with channel multipath length greater than 3 μs is TU channel.

[0036] The signal-to-noise ratio is a segmented quantized signal-to-noise ratio, and the segment range is 0 dB to 30 dB, and the segment mode is shown in Table 1.

[0037] Table 1

[...

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Abstract

The invention discloses a channel estimation method of an orthogonal frequency division multiplexing (OFDM) communication system, belonging to the technical field of mobile communication. The method comprises the following steps: acquiring frequency domain interpolation coefficient values under the conditions of different channel types and signal-to-noise ratios; extracting receiving values at pilot subcarriers; estimating the channel function value at each pilot subcarrier; carrying out sampling estimation of the channel types; carrying out sampling estimation of the signal to noise ratios; selecting a proper frequency domain LMMSE interpolation coefficient W; and carrying out segmented interpolation of the frequency domain and linear interpolation of the time domain. The invention simplifies the LMMSE method, selects different prestored interpolation coefficients according to the specific conditions of channels, does not need matrix inversion operation and has simple implementation; and meanwhile, the segmented interpolation is adopted in the frequency domain, thereby having the effects of stable performance and easy implementation.

Description

technical field [0001] The invention relates to a method in the technical field of mobile communication, in particular to a channel estimation method for an OFDM communication system. Background technique [0002] The goal of the new generation mobile communication system is higher data rate, better service quality (QoS), higher spectrum utilization, higher security, higher intelligence, and higher flexibility; it can support Asymmetric services, and can support multiple services. To achieve this goal, many technical challenges need to be overcome. The wireless mobile communication system is facing a very bad mobile wireless channel. Due to multipath propagation, the signal will be broadened in time and cause frequency selective fading; when the mobile terminal or surrounding objects are in motion, the time-varying characteristics of the channel will cause broadening of the signal spectrum. [0003] In recent years, OFDM technology has been widely used due to its good ant...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
Inventor 徐鹏超俞晖姜楠罗剑徐友云
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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