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OFDM signal peak-to-average power ratio suppression method based on truncated companding

A signal peak-to-signal technology, applied in the field of OFDM signal peak-to-average ratio suppression based on truncated companding, can solve problems such as system performance degradation, out-of-band spectrum leakage, and the impact of received signal bit error rate.

Inactive Publication Date: 2016-12-14
CHANGAN UNIV
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  • Application Information

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Problems solved by technology

However, the disadvantage of this method is that it will have a greater impact on the bit error rate of the received signal, and it will cause a large out-of-band spectrum leakage, which will cause a sharp decline in system performance.

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  • OFDM signal peak-to-average power ratio suppression method based on truncated companding
  • OFDM signal peak-to-average power ratio suppression method based on truncated companding
  • OFDM signal peak-to-average power ratio suppression method based on truncated companding

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Embodiment Construction

[0051] Refer to attached figure 1 , the specific implementation steps of the present invention are as follows:

[0052] (1) Perform serial-to-parallel conversion and quadrature amplitude modulation on the original input signal, and map the input data into a quadrature amplitude modulation signal X=[X 0 ,X 1 ,...,X k ,...,X N-1 ], wherein, N represents the number of subcarriers included in the OFDM system;

[0053] (2) Perform OFDM modulation and parallel-serial conversion on the quadrature amplitude modulation signal to obtain the OFDM modulated signal, according to the following formula:

[0054] x n = 1 N Σ n = 1 N X k e j 2 π J ...

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Abstract

The invention relates to an OFDM signal peak-to-average power ratio suppression method based on truncated companding (compressing + expanding), comprising the steps as follows: carrying out serial-to-parallel conversion and quadrature amplitude modulation of an original input signal to get a quadrature amplitude modulation signal, carrying out OFDM modulation and parallel-to-serial conversion of the quadrature amplitude modulation signal to get an OFDM-modulated signal xn, and using a companding function C(.) to carry out companding conversion of the tail distribution of the modulus value of the OFDM-modulated signal to get a companding conversion signal xn', wherein xn'=C(x); launching the companding conversion signal xn'; using a decompanding function C<-1>(.) to decompand the received signal at a receiver to get a decompanded signal xn'', wherein xn''=C<-1>(x); and carrying out OFDM demodulation of the decompanded signal to restore the original input signal. Through the method, a good OFDM system peak-to-average power ratio suppression effect is achieved under the conditions of very low out-of-band spectrum leakage and good bit error rate performance of the receiver.

Description

【Technical field】 [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an OFDM signal peak-to-average ratio suppression method based on truncated companding. 【Background technique】 [0002] Orthogonal frequency division multiplexing OFDM (orthogonal frequency division multiplexing) modulation technology has good anti-multipath ability and efficient frequency band utilization, and has become one of the key technologies of future wireless communication systems. At present, OFDM modulation technology has been widely used in the second type of high-performance local area network (High-PerformanceLAN type 2, HIPERLAN / 2), asymmetric digital subscriber loop (Asymmetric Digital Subscriber Line, ADSL), high-definition television in Europe and North America. (High Definition Television, HDTV), and 3GPP (The 3rd Generation Partnership Project) Long Term Evolution (LTE) and other standards. [0003] However, there are still some im...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2615
Inventor 侯俊赵祥模惠飞张阳马峻岩史昕杨澜
Owner CHANGAN UNIV