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Multiband OFDM-UWB system-based sigma-delta modulation method

A modulation method and modulator technology, applied in multi-frequency code systems and other directions, can solve problems such as inability to meet performance requirements, and achieve the effect of easy hardware implementation and good bit error rate performance

Active Publication Date: 2012-10-17
NANKAI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the rapid development of UWB technology, the transmission rate and bandwidth will continue to increase. The traditional D / A and A / D converters based on the existing ∑∆ modulator are no longer suitable for the MB-OFDM-UWB system. meet its performance requirements

Method used

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  • Multiband OFDM-UWB system-based sigma-delta modulation method
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  • Multiband OFDM-UWB system-based sigma-delta modulation method

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Embodiment

[0024] The invention is applied in the MB-OFDM-UWB system. According to the ECMA368 standard, the system adopts convolution coding, Viterbi decoding, QPSK modulation, and 128-point IFFT / FFT. Each OFDM symbol contains 128 subcarriers, consisting of 100 data subcarriers, 12 pilot subcarriers, 10 guard subcarriers and 6 empty subcarriers. A 37-point zero suffix is ​​added after each OFDM symbol as a guard interval. Together with the OFDM symbol, this zero suffix constitutes a 165-point OFDM time-domain signal, and the system sampling frequency is 528MHz.

[0025] 1. After the MB-OFDM-UWB signal is transformed into the time domain by IFFT, store an OFDM symbol in the buffer at a rate of 132Mb / s, and read the OFDM symbol from the buffer at a rate of 528Mb / s. Domain interpolation, so that three zeros are inserted between MB-OFDM-UWB subcarriers in the frequency domain to form a gap between two subcarriers.

[0026] 2. The ΣΔ modulator compares the input signal with the feedback sig...

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Abstract

On the basis of a multiband orthogonal frequency division multiplexing ultra wide band (MB-OFDM-UWB) technology, the invention brings forward a sigma-delta modulation method that is used for completing data conversion of an MB-OFDM-UWB system. The method is characterized in that: after time-domain interpolation is carried out on an MB-OFDM-UWB signal, sigma-delta modulation is carried out, wherein the time-domain interpolation enables gaps to be formed among MB-OFDM-UWB subcarriers; a sigma-delta modulator includes an integrator, a 1-bit quantizer and a loop delay circuit and when an input signal is quantized into a 1-bit data flow, quantizing noise shaping is completed; the sigma-delta modulator introduces null points on MB-OFDM-UWB subcarrier frequency points into a quantizing noise frequency spectrum so as to push the quantizing noises into gaps of the signal frequency spectrum, thereby realizing a noise shaping effect. The sigma-delta modulation method is suitable for an MB-OFDM-UWB system to enable signal conversion to be well completed, so that system has an improved signal to noise ratio and a good error rate performance.

Description

technical field [0001] The invention relates to a ΣΔ modulator applied to a multi-band orthogonal frequency division multiplexing ultra-wideband (MB-OFDM-UWB) system. A data converter with the modulator as the core completes MB-OFDM-UWB signal conversion. The modulator uses the noise shaping technology to introduce several zero points in the quantization noise spectrum, and fills the signal spectrum gap with the quantization noise, which belongs to the technical field of wireless communication. Background technique [0002] An ultra wide band (UWB) signal is defined as a signal with a relative bandwidth (ratio of signal bandwidth to center frequency) greater than 0.25, or an absolute bandwidth not less than 500 MHz. UWB system has its unique advantages, such as strong anti-multipath fading ability, high spectral efficiency, low power consumption, low cost, etc. These advantages make it have great potential in wireless communication. UWB technology can be applied to wireless...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 吴虹赵迎新向坤章辉
Owner NANKAI UNIV
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