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System and method of processing frequency-diversity coded signals with low sampling rate

A technology for frequency diversity and processing systems, applied in multi-frequency code systems, transmission systems, digital transmission systems, etc., to achieve the effects of reduced cost and power consumption, reduced sampling rate, and effective diversity/coding gain

Inactive Publication Date: 2008-02-27
MEDIATEK INC
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Problems solved by technology

[0007] One of the purposes of the present invention is to provide a frequency diversity coding processing system and its processing method to solve the problem of maximum power spectral density in ultra-bandwidth systems

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  • System and method of processing frequency-diversity coded signals with low sampling rate
  • System and method of processing frequency-diversity coded signals with low sampling rate
  • System and method of processing frequency-diversity coded signals with low sampling rate

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[0051] In order to make the above-mentioned and other purposes, features, and advantages of the present invention more obvious and understandable, the accompanying drawings are now described in detail as follows:

[0052] The present invention provides a novel frequency band spreading mechanism, which is used in ultra-wideband (UWB) systems with Orthogonal Frequency Division Multiplexing (OFDM) modulation. The frequency band spreading mechanism can be achieved simply by frequency diversity coding processing. Frequency diversity coding Orthogonal Frequency Division Multiplexing (OFDM) expands the frequency band to M that is larger than the original transmission bandwidth t times, where M t is a positive integer greater than 1. An important feature of the frequency diversity coding process of the present invention is that it allows the receiver to sample and process the baseband received signal at a sampling rate lower than the Nyquist rate. Alias ​​occurs due to the reduced ...

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Abstract

A system and method of processing frequency-diversity coded signals with a low sampling rate less than the Nyquist rate for ultra-wideband devices are described. The frequency-diversity coding system comprises a frequency-diversity encoder, one or more first transformation device, a summation device, a signal filter, a sampling device, a second transformation device and a frequency-diversity decoder. The frequency-diversity encoder encodes a plurality of information blocks to output matrix elements. The first transformation devices convert the matrix elements into a plurality of OFDM symbols. The summation device superposes a plurality of frequency bands to generate a transmitted signal. The signal filter eliminates noise in the received signal. The signal filter comprises a low-pass filter for removing the noise in the received signal. The sampling device coupled to the signal filter samples the received signal by a sampling rate less than a Nyquist rate. The sampling rate is equal to the bandwidth of one subcarrier of the OFDM symbols. Additionally, the frequency-diversity decoder coupled to the second transformation device interprets the received signal to decode the information blocks.

Description

technical field [0001] The present invention relates to a system and method for processing frequency-diversity coded signals, and in particular to an ultra-wideband (UWB) receiver with a sampling rate less than the Nyquist rate. A system for processing frequency diversity Orthogonal Frequency Division Multiplexing (OFDM) and a processing method thereof. Background technique [0002] In a high-speed, short-range personal area network (Personal Area Network, PAN) ultra-wideband (UWB) system, frequency diversity orthogonal frequency division multiplexing (OFDM) has been provided as a physical layer. However, for signals transmitted in ultra-wideband (UWB) systems, the maximum power spectral density is limited. Therefore, it is necessary to use a spread spectrum mechanism to spread the bandwidth of the transmitted spectrum signal to reduce the power density of the spectrum signal as much as possible. [0003] In the existing digital signal processing (DSP), the problem of the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/69H04L27/26
CPCH04L27/2602H04L1/04H04B1/7176
Inventor 邱茂清
Owner MEDIATEK INC
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