Synchronization and channel estimation scheme for multi-band orthogonal frequency division multiplexing (OFDM) ultra wideband receiver

An ultra-wideband receiver and channel estimation technology, which is applied to the shaping network, multi-frequency code system, baseband system components and other directions in the transmitter/receiver. Effects of hardware implementation, efficient estimation and compensation

Inactive Publication Date: 2012-09-12
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

Wrong symbol timing position can cause severe ISI, greatly affecting system performance

Method used

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  • Synchronization and channel estimation scheme for multi-band orthogonal frequency division multiplexing (OFDM) ultra wideband receiver
  • Synchronization and channel estimation scheme for multi-band orthogonal frequency division multiplexing (OFDM) ultra wideband receiver
  • Synchronization and channel estimation scheme for multi-band orthogonal frequency division multiplexing (OFDM) ultra wideband receiver

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Embodiment

[0065] A 200bps mode UWB system is constructed according to the ECMA-368 standard, and the synchronization and channel estimation scheme proposed by the present invention is simulated.

[0066] Figure 4 Shown is the correlation calculation result in one frame when the signal-to-noise ratio is 0dB under the CM4 channel. It can be seen that C(i) changes between 0 and 1, and there is a correlation peak in one frame, and the peak is relatively sharp. The simulation determines a threshold value G, and when two consecutive C(i) change from less than G to greater than G, it is confirmed that a frame has been detected.

[0067] Figure 5(a)(b)(c)(d) are the rough timing deviation histograms when the SNR is 5dB in the CM1, CM2, CM3 and CM4 channels respectively, where the UWB channel is set to change once in a frame, and the frame in the simulation The number is about 1500. It can be seen that the timing deviation under various channel models generally presents a Gaussian distributio...

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Abstract

The invention discloses an integral synchronization and channel estimation scheme for a multi-band orthogonal frequency division multiplexing (OFDM) ultra wideband receiver, and is applied to a high-speed short-distance ultra wideband wireless communication background. A baseband hopping multi-band implementation scheme is adopted; a self-correlation and energy detection-based symbol timing method is disclosed; the influence of single-carrier frequency offset under a baseband hopping mechanism on a system is equivalently consistent with that under radio frequency hopping, so that an improved maximum likelihood estimation method is disclosed; frequency-domain phase deviation caused by sampling frequency offset is compensated on the basis of phase equalization; and a channel is compensated on the basis of overlap-add and frequency-domain equalization, and residue symbol timing deviation, carrier phase deviation, amplitude attenuation caused by carrier frequency offset, and amplitude attenuation and integer sample deviation, which are caused by the sampling frequency offset, are also compensated. By the scheme, the tolerance of a guard interval is fully utilized, the system has high error performance, and the overall complexity of an algorithm is lowered.

Description

technical field [0001] Synchronization and channel estimation algorithm is a key part of determining system performance in a wireless communication receiver. The present invention proposes a complete synchronization and channel estimation scheme in a multi-band OFDM ultra-wideband receiver, specifically involving frame detection, symbol timing, carrier frequency synchronization, sampling Frequency synchronization and channel estimation and equalization. The scheme can be widely used in a high-speed short-distance ultra-wideband wireless communication system based on multi-band OFDM. Background technique [0002] Ultra-wideband (UWB) system has the advantages of high transmission rate, low power consumption, strong anti-interference ability, etc. It is the development direction of the future wireless communication field. Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) is one of the UWB physical layer technical solutions. It is proposed as the physical layer st...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/02H04L25/03
Inventor 戈立军苗长云李春雨巨阿强
Owner TIANJIN POLYTECHNIC UNIV
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