Meethod of lowering multicarrier communication system signal peak uniform power ratio using cyclic matrix
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
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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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