OFDM communication system and method based on companding

A companding, communication system technology, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve problems such as constellation diffusion, reduce bit error rate, improve system reliability, and reduce constellation diffusion problems. Effect

Active Publication Date: 2013-08-21
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] In view of the above-mentioned defects of the prior art, the present invention proposes an OFDM communication system and method to solve the problem...

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  • OFDM communication system and method based on companding
  • OFDM communication system and method based on companding
  • OFDM communication system and method based on companding

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Embodiment Construction

[0016] The present invention provides an OFDM communication system based on compression and expansion, including: a wired or wireless communication channel, a transmitting device, and a receiving device. The transmitting device includes a compression conversion module that suppresses the peak-to-average ratio of the OFDM signal. The transmitting device transmits a signal to the receiving device. ; The receiving device restores the signal of the sending end according to the received signal.

[0017] The receiving device includes a first FFT unit, a channel equalization unit, an IFFT unit, an extended transform unit, a second FFT unit, a parallel-serial conversion unit and a decoding unit; the first FFT unit performs processing on the signal received by the receiving device For the first FFT transformation, the channel equalization unit performs channel equalization processing on the frequency domain signal after passing the first FFT unit; the IFFT unit performs IFFT conversion on ...

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Abstract

The invention provides an OFDM communication system and method based on companding. A bit stream input into a transmitting device forms OFDM signals after base band mapping and IFFT, and after companding and transformation are carried out on the OFDM signals, parallel-serial conversion is carried out on the OFDM signals and then the OFDM signals enter a power amplifier, and the amplified signals are mapped to a transmitting unit to be transmitted; a receiving device carries out serial-parallel conversion on received time-domain signals, the first time of FFT is carried out on the time-domain signals, the time-domain signals is transformed into frequency domain signals, channel information is obtained through channel estimation, channel equalization is carried out on the received frequency domain signals, the equalized signals are converted into a time domain through the IFFT, expanding transformation is carried out on the equalized signals, then the equalized signals are sent to an FFT module for demodulation and decoding, and finally the needed bit stream is obtained through the base band mapping. The OFDM communication system based on the companding can effectively solve the problem that constellation diagrams of a traditional companding OFDM communication system are scattered in a multipath channel, can effectively reduce an EVM value, and lowers the error rate.

Description

Technical field [0001] The present invention relates to the field of communication technology, in particular to a communication system and method of OFDM (Orthogonal Frequency Multiplexing) technology. Background technique [0002] The emergence of Orthogonal Frequency Division Multiplexing (OFDM) technology has solved the frequency selective fading of wireless channels and is considered to be one of the core technologies of the fourth-generation mobile communication 4G. One of the main shortcomings of the OFDM system is its large peak-to-average ratio (PAPR), which directly affects the operating cost and efficiency of the entire system. When the signal exceeds the dynamic range of the power amplifier and cannot be linearly input, it will cause serious signal distortion and destroy the orthogonality between the sub-carriers. Cause in-band signal distortion and out-of-band spectrum dispersion. [0003] At present, many methods have been proposed to reduce the peak-to-average ratio...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L1/00
Inventor 王毅汪千栋陈前斌杨运春甄珊刘超唐瀚王香瑜
Owner CHONGQING UNIV OF POSTS & TELECOMM
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