A low-complexity signal detection method and device in an OFDM system
A low-complexity, signal detection technology, applied in the field of communication, can solve high-complexity problems and achieve the effect of reducing complexity
Active Publication Date: 2016-03-30
CHINA MOBILE COMM GRP CO LTD
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However, for OFDM symbols with N subcarriers, this algorithm needs to perform N times of inversion operations of N-order MMSE detectors, so the complexity is high, O(N 4 )
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[0035] The applicant first analyzed the carrier energy distribution characteristics of the OFDM system under the time-varying channel.
[0036] figure 1 It is the schematic diagram of digital baseband signal processing of OFDM system.
[0037] like figure 1 As shown, assuming that there are N orthogonal subcarriers in one OFDM block, the OFDM frequency domain symbols of N points {X 0 , X 1 , X 2 ...... X N-1} is mapped to N orthogonal subcarriers after serial-to-parallel transformation, and then undergoes N-point inverse fast Fourier transform (IFFT transformation) to form N-point OFDM time-domain symbols {x 0 , x 1 , x 2 ...... x N-1}, after parallel-to-serial conversion, a cyclic prefix is added before the N-point OFDM time-domain symbol, and the transmission is performed through a multipath time-varying channel, and the receiving end removes the cyclic prefix from the received time-domain signal. After serial-to-parallel conversion and fast Fourier transform (FFT...
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The invention discloses a method and a device for low complexity signal detection in an orthogonal frequency division multiplexing (OFDM) system. The method for the low complexity signal detection in the OFDM system comprises that a detecting carrier wave k is determined, wherein k refers to the serial number of a to-be-detected carrier wave; the number L of adjacent carrier waves are determined according to the energy distribution of the to-be-detected carrier wave k, wherein the normalized energy which is leaked to the group of adjacent carrier waves which range from a carrier wave k-L to a carrier wave k+L by the to-be-detected carrier wave k reaches a preset threshold value; partial frequency domain channel matrix H k of the to-be-detected carrier wave k is captured from a frequency domain channel matrix H according to the number L of the adjacent carrier waves, wherein the partial frequency domain channel matrix H k is formed by frequency domain column vectors related to the carrier waves from the k-L to the k+L; detectors of the to-be-detected carrier wave k are calculated by using the partial frequency domain channel matrix H k, and the detection result on the to-be-detected carrier wave k is calculated by using the detectors; and the step of determining the to-be-detected carrier wave is repeated until signs on all carrier waves are detected. The method and the device for the low complexity signal detection in the OFDM system can reduce the complexity of signal detection.
Description
technical field [0001] The invention relates to the field of communication technology, in particular to a low-complexity signal detection method and equipment in an OFDM system. Background technique [0002] Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) is a multi-carrier modulation technique. This kind of modulation technology divides the channel into N mutually orthogonal sub-channels, converts high-speed data signals into parallel low-speed sub-data streams, and modulates the low-speed sub-data streams into each sub-channel for transmission. Because the frequency spectrums of the subcarriers overlap with each other, the OFDM technology has a higher spectrum utilization rate. OFDM technology not only has a high spectrum utilization rate, but also has a strong ability to resist multipath propagation and a high transmission rate, which can meet the anti-multipath propagation of the new generation of mobile communication, and t...
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IPC IPC(8): H04L25/02H04L27/26
Inventor 王红梅余智欣戴欣刘越赵立君
Owner CHINA MOBILE COMM GRP CO LTD