Interference cancellation detection method suitable for short cyclic prefix OFDM

A technology of interference cancellation and detection method, which is applied in the shaping network, baseband system, and digital transmission system in the transmitter/receiver, and can solve the problems of high hardware complexity, large detection delay, and high complexity of parallel interference cancellation

Active Publication Date: 2019-11-15
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In recent years, some scholars have proposed CP recovery and decision feedback at the receiving end, but this method requires repeated FFT/IFFT operations, which is extremely complex
Although the pr

Method used

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  • Interference cancellation detection method suitable for short cyclic prefix OFDM
  • Interference cancellation detection method suitable for short cyclic prefix OFDM
  • Interference cancellation detection method suitable for short cyclic prefix OFDM

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Table 1

[0084]

[0085] According to the channel model, it is calculated that

[0086]

[0087] therefore:

[0088]

[0089] R=32 was calculated from this empirical formula.

[0090] The bit error rate performance under the scheme obtained by simulation is as follows: figure 2 shown. In the figure, the above-mentioned interference cancellation scheme is named "partial packet interference cancellation", and the BER performance of single-tap frequency domain equalization under the same cyclic prefix condition is used for this purpose.

[0091] As shown in the figure, under the same channel model and cyclic prefix length, the traditional single-tap frequency domain equalization has a higher bit error rate floor (about 5×10 -2 ); and the partial packet interference cancellation designed by this patent will directly reduce the bit error rate level to 7×10 when not encoded -3 , quite impressive. At the same time, compared with the traditional serial interfer...

Embodiment 2

[0095] table 3

[0096]

[0097] 5G measured long multipath channel model:

[0098] The multipath positions of the channel with a non-zero impulse response are [1, 9, 31, 39, 136, 213, 256], and the corresponding normalized power strengths are [0.0903, 0.1083, 0.2036, 0.1853, 0.1003, 0.2116, 0.1007 ].

[0099] According to the channel model, it is calculated that

[0100]

[0101] therefore

[0102]

[0103] R=32 was calculated from this empirical formula.

[0104] The bit error rate performance under the scheme obtained by simulation is as follows: image 3 shown. In the figure, the above-mentioned interference cancellation scheme and the BER performance of the single-tap frequency domain equalization under the condition of the same cyclic prefix are compared.

[0105] As shown in the figure, under the same channel model and cyclic prefix length, the traditional single-tap frequency domain equalization has a higher bit error rate floor (about 5×10 -2 ); and the ...

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Abstract

The invention discloses an interference cancellation detection method for an OFDM transmission system of a short cyclic prefix. The invention provides an effective interference cancellation detectionscheme for a scene of severe inter-subcarrier interference (ICI) and inter-symbol interference (ISI) caused by insufficient cyclic prefixes of OFDM signals in a multipath fading channel. The window radius of partial interference cancellation is calculated according to a channel delay power spectrum, and partial interference cancellation detection is sequentially carried out on designed subcarriergroups. According to the method, the detection time delay and the hardware implementation complexity can be well balanced, and the bit error rate leveling problem of the short cyclic prefix OFDM system is effectively improved while the conventional interference cancellation operand is reduced.

Description

technical field [0001] The invention belongs to the field of wireless mobile communication, and in particular relates to an interference cancellation detection method suitable for a short cyclic prefix OFDM transmission system. Background technique [0002] OFDM is a modulation technique commonly used in modern wireless mobile communication systems (LTE, WiMAX, fifth-generation mobile communication systems, etc.). In OFDM, in order to avoid inter-symbol interference (ISI) and inter-carrier interference (ICI), a cyclic prefix (Cyclic Prefix, CP) is added to the front end of each transmitted symbol. The length of the CP must be at least as large as the multipath delay length of the channel to ensure the orthogonality between subcarriers. In this way, the receiving end only needs to use single-tap equalization to compensate channel distortion. [0003] However, in some channel environments, the channel impulse response is very long, and using sufficient CP will seriously redu...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L27/26
CPCH04L25/03159H04L25/03305H04L25/03324H04L25/03821H04L27/2607
Inventor 赵春明时伟姜明
Owner SOUTHEAST UNIV
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