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Method and system for adjusting bandwidth of frequency domain smoothing filter for channel tracking loop in OFDM communication system

A technology for channel tracking and communication systems, applied in the OFDM communication system to adjust the bandwidth and system field of the frequency domain smoothing filter used in the channel tracking loop, which can solve the problem that the constant bandwidth filter filtering is not optimal and cannot be fully compensated noise impact etc.

Pending Publication Date: 2022-02-18
U-BLOX
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, filtering with a constant bandwidth filter (especially in the frequency domain) is suboptimal and may not adequately compensate for the effect of noise on the channel response estimate

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  • Method and system for adjusting bandwidth of frequency domain smoothing filter for channel tracking loop in OFDM communication system
  • Method and system for adjusting bandwidth of frequency domain smoothing filter for channel tracking loop in OFDM communication system
  • Method and system for adjusting bandwidth of frequency domain smoothing filter for channel tracking loop in OFDM communication system

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Embodiment Construction

[0015] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings, wherein the same reference numbers in different drawings indicate the same or similar elements unless otherwise indicated. The implementations set forth in the following disclosure are consistent with the relevant aspects of the present invention as set forth in the appended claims.

[0016] According to some embodiments, there is provided a method of adjusting the bandwidth of a frequency domain smoothing filter for a channel tracking loop of an OFDM communication system. As an example, figure 1 An OFDM communication system with a channel tracking loop is shown. An OFDM transmitter device (not shown) may transmit a signal for reception by device 100 including a channel tracking loop. Apparatus 100 may be an OFDM receiver and may include antenna 102 , RF front-end system 104 ,...

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Abstract

A method and system for adjusting the bandwidth of a frequency domain smoothing filter for a channel tracking loop in a OFDM communication system are disclosed. The OFDM communication system includes: a smoothing filter; an equalizer; processors; and a memory containing instructions causing the processors to perform steps of: providing to the smoothing filter a plurality of channel response estimates, each corresponding to a symbol and a channel; receiving a plurality of filtered channel response estimates, each corresponding to a value of the channel response estimate; calculating a plurality of error vectors, each having a plurality of error values, each error value being a difference between the channel response estimate and the filtered channel response estimate; obtaining a mean error vector having a plurality of mean error values, each corresponding to a subcarrier for all symbols; calculating a power of each subcarrier based on the mean error values of the mean error vector; comparing the power of each subcarrier with a threshold power; and adjusting the bandwidth of the smoothing filter based on the comparison.

Description

technical field [0001] Apparatuses and methods consistent with the present disclosure generally relate to radio receivers and methods for using frequency domain smoothing filters for channel tracking loops in OFDM communication systems. Background technique [0002] In wireless communications, Orthogonal Frequency Division Multiplexing (OFDM) is a data encoding and modulation method that enables data to be transmitted on a dense series of orthogonal subcarriers of a transmission channel. OFDM achieves high spectral efficiency by allowing increased data to be sent over a given bandwidth. Typically in an OFDM communication system, a transmitter device may encode information into data bits, modulate the data bits into a signal, and transmit the signal via a transmission channel. Upon receiving the signal, the receiver device may reverse the operation of the transmitter device in order to obtain the original information contained in the received signal. Accordingly, the receiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03
CPCH04L25/0212H04L25/03006H04L25/022H04L25/023H04L25/03159H04L25/03
Inventor D·卡洛格罗斯
Owner U-BLOX