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Meethod of lowering multicarrier communication system signal peak uniform power ratio using cyclic matrix
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A technology of multi-carrier communication and peak-to-average power ratio, which is applied in the field of communication and can solve problems such as system performance deterioration
Inactive Publication Date: 2004-12-22
TSINGHUA UNIV
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However, these methods introduce processingnoise (clipping or companding) that can degrade system performance
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Embodiment 1
[0066] Example one, as figure 1 a, including the following steps:
[0067] The first step, at the transmitting end, read a signal vector of length N, use s=(s 1 , s 2 , L, s N ) T represent, and use this vector to form a left-shift circulant matrix, using C L (s T ) represents that the kth row of the matrix is generated by cyclically shifting the signal vector to the left by (k-1) bits (k=1, L, N). If you define T L ( ) is the left cyclic shift operator on the complex field, that is, T L (α 1 , a 2 , L, α N-1 , a N )=(α 2 , a 3 , L, α N , a 1 ), then the kth row of the CL(sT) matrix can be represented by T L k-1 (s T ) means, where T L 0 (s T ) represents an identity transformation. Then compute and store F -1 ·C L (s T ), denoted as Θ s . Note here that the matrix Θ s The first column vector of is the original OFDM signal vector U 0 =F -1 s.
[0068] The second step, at the transmitting end, calculate and store the original OFDM signal vector ...
Embodiment 2
[0079] Embodiment two, such as figure 1 b, including the following steps:
[0080] The first step, at the transmitting end, read in a signal vector with a length of N, use s=(s 1 ,s 2 ,L,s N ) T Represent, and use this vector to form a left-shifted circulant matrix, using C L (s T ) means that the kth row of the matrix is generated by shifting the signal vector to the left by (k-1) bits; then calculate and store F -1 ·C L (s T ), denoted as Θ s . Note that the matrix Θ s The first column of is the original OFDM signal vector U 0 =F -1 s.
[0081] In the second step, calculate and store the original OFDM signal vector U 0 The instantaneous peak-to-average power ratio r 0 (U 0 ),which is
[0082] r 0 ( U 0 ) = max 1 ≤ k ≤ N ...
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Abstract
The invention relates to a method for using circular matrix to reduce the signal peak-mean power ratio of multi-carrier communication system which belongs to communication technology field, the character lies in: at the transmitting end, through forming circular matrix, carries on weighting conversion to the multi-carrier modulator with a converter (the digital signalprocessing unit); at the receiving end, it carries on reverse conversion to the output signal of the multi-carrier demodulator with a reverse converter according to the reverse conversion rule correspondent to the transmitting end. The invention can reduce the peak-mean power ratio of the input signal effectively with lower calculation quantity and complexity in condition that does not provoke the system error byte rate performance loss, avoids the nonlinear loss when the power amplifier amplifies the signal.
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