Method for estimating the signal-to-noise ratio for packet transmission and reception systems of signals based on m-dpsk modulations and apparatus thereof
AssigneeDora S.p.A.
InventorsPaola Bisaglia, Simone Bois, Eleonora Guerrini
Life of this patent
Estimating the term…
Abstract
A method of estimating a signal-to-noise ratio from a received M-DPSK modulated signal, comprising a sequence of N known symbols, based on a division of the known symbols N and of N samples of the received signal at the output of the channel into a number of blocks B of length L with B greater than one.
Claims35
A method comprising:
- receiving a modulated signal, the signal comprising a sequence of N known transmitted symbols modulated using M-ary Differential Phase Shift Keying (M-DPSK) modulation with at least one carrier;
- and
- estimating, using at least one processor, a signal-to-noise ratio based on a division of N samples of the received signal and of the N known transmitted symbols into a number of blocks B of a length L, with N, B and L being positive integer values with B>1 and L<N.
An apparatus, comprising:
- a module configured to obtain a number B of blocks of a length L based on a division of a number N of known symbols and of a number N of samples of a received signal at an output of a channel, with N, B and L being positive integer values, and B greater than one;
- and
- an estimator configured to estimate, based on the number of blocks B and the length L, a signal-to-noise ratio of the received signal comprising a sequence of the N known symbols modulated using M-ary Differential Phase Shift Keying (M-DPSK) modulation with at least one carrier signal.
A computer-readable memory medium whose contents cause at least one processor to perform a method, the method comprising:
- obtaining a number of blocks B of a length L based on a division of a number of known symbols N and of N samples of a received signal at an output of a channel into the number of blocks B of length L, with B, L and N positive integer values, and B greater than one;
- and
- estimating, based on the number of blocks B and the length L, a signal-to-noise ratio of a received signal comprising a sequence of the N known symbols modulated using M-ary Differential Phase Shift Keying (M-DPSK) modulation with at least one carrier signal.
A system, comprising:
- a differential demodulator configured to demodulate a received signal comprising a sequence of N known symbols modulated using M-ary Differential Phase Shift Keying (M-DPSK) modulation with at least one carrier signal;
- and
- an estimator configured to estimate a signal-to-noise ratio of the received signal based on a division of the N known symbols and of N samples of the received signal at an output of a channel into a number of blocks B of length L, with N, B and L being positive integer values, and B greater than one.
A system comprising:
- means for obtaining a number of blocks B of a length L based on a division of a sequence of known symbols N and of N samples of a received signal at an output of a channel into the number of blocks B;
- and
- means for estimating, based on the number of blocks B and the length L, a signal-to-noise ratio of a received signal comprising a sequence of the N known symbols modulated using M-ary Differential Phase Shift Keying (M-DPSK) modulation with at least one carrier signal.
A method for estimating a signal-to-noise ratio for a packet transmission and reception system of signals having a known data sequence by means of a M-DPSK modulation with at least one carrier, said system comprising packet transmission of a signal with a sequence of N known symbols, with N positive integer number, said transmission comprising a M-DPSK modulation of the signal to transmit by means of a M-PSK mapper and a differential block, the transmission of the M-DPSK modulated signal (s(t)) through a channel having constant gain (G) over all the N symbols and in presence of noise (w(t)) with null average, and reception of a signal (r(t)) at the output of the channel, said method comprises estimation of a signal-to-noise ratio of the received signal with the division of the N known symbols (ak) and of the N samples (rk) of the signal (r(t)) at the output of the channel into B blocks of L length with B and L positive integer numbers and B greater than one and wherein B is expressed by
- B
- =
- N
- -
- L
- L
- -
- O
- +
- 1
- ≥
- N
- L
- wherein O indicates an overlapping factor of consecutive blocks having length L and calculation of the estimation of the signal-to-noise ratio by means of an equation:
- SNR
- =
- (
- L
- -
- 1
- )
- B
- ·
- L
-
- ∑
- b
- =
- 0
- B
- -
- 1
-
-
- 1
- L
-
- ∑
- k
- =
- l
- b
- l
- b
- +
- L
- -
- 1
-
- r
- k
-
- a
- k
- *
-
- 2
- 1
- B
-
- ∑
- b
- =
- 0
- B
- -
- 1
-
- 1
- L
-
- ∑
- k
- =
- l
- b
- l
- b
- +
- L
- -
- 1
-
-
- r
- k
-
- 2
- -
- 1
- B
-
- ∑
- b
- =
- 0
- B
- -
- 1
-
-
- 1
- L
-
- ∑
- k
- =
- l
- b
- l
- b
- +
- L
- -
- 1
-
- r
- k
-
- a
- k
- *
-
- 2
- -
- 1
- L
- wherein lb=b·(L−O)+l where l is an index denoting a position of a first known symbol of the sequence of length N in the packet, rk is a sample of the received signal at the output of the channel correspondent to a known transmitted symbol, ak is the M-DPSK modulated known transmitted symbol, a*k is a complex conjugate of the M-DPSK modulated known transmitted symbol and SNR indicates the estimation of the signal-to-noise ratio.
An apparatus to estimate a signal-to-noise ratio for a packet transmission and reception system of signals having a known data sequence by means of a M-DPSK modulation with at least one carrier, said system comprising means for the packet transmission of a signal with a sequence of N known symbols, with N positive integer number, said transmission means comprising a M-DPSK modulator of the signal to transmit comprising a M-PSK mapper and a differential block, said M-DPSK modulated signal (s(t)) being adapted to pass through a channel having constant gain (G) over all the N symbols and in presence of noise (w(t)) with null average, said system comprises means (10) for receiving a signal (r(t)) at an output of the channel, said apparatus comprising first means adapted to divide the N known symbols (ak) and the N samples (rk) of the signal (r(t)) at the output of the channel into B blocks of L length with B and L positive integer numbers and B greater than one and said first means (101) being adapted to overlap consecutive blocks having length L of a factor O, said B blocks being expressed by
- B
- =
- N
- -
- L
- L
- -
- O
- +
- 1
- ≥
- N
- L
- wherein O indicates an overlapping factor of consecutive blocks having length L, and second means adapted to calculate the estimation of the signal-to-noise ratio by means of an equation:
- SNR
- =
- (
- L
- -
- 1
- )
- B
- ·
- L
-
- ∑
- b
- =
- 0
- B
- -
- 1
-
-
- 1
- L
-
- ∑
- k
- =
- l
- b
- l
- b
- +
- L
- -
- 1
-
- r
- k
-
- a
- k
- *
-
- 2
- 1
- B
-
- ∑
- b
- =
- 0
- B
- -
- 1
-
- 1
- L
-
- ∑
- k
- =
- l
- b
- l
- b
- +
- L
- -
- 1
-
-
- r
- k
-
- 2
- -
- 1
- B
-
- ∑
- b
- =
- 0
- B
- -
- 1
-
-
- 1
- L
-
- ∑
- k
- =
- l
- b
- l
- b
- +
- L
- -
- 1
-
- r
- k
-
- a
- k
- *
-
- 2
- -
- 1
- L
- wherein −lb=(L−O)·b+l where l is an index denoting a position of a first known symbol of the sequence of length N in the packet, rk is a sample of the received signal at the output of the channel correspondent to a known transmitted symbol, ak is the M-DPSK modulated known transmitted symbol, a*k is a complex conjugate of the M-DPSK modulated known transmitted symbol and SNR indicates the estimation of the signal-to-noise ratio.
A packet transmission and reception system of signals having a known data sequence by means of a M-DPSK modulation with at least one carrier, said system comprising means for packet transmission of a signal with a sequence of N known symbols, with N positive integer number, said transmission means comprising a M-DPSK modulator of the signal to transmit comprising a M-PSK mapper and a differential block, said M-DPSK modulated signal (s(t)) being adapted to pass through a channel having constant gain (G) over all the N symbols and in presence of noise (w(t)) with null average, said system comprising means for receiving a signal (r(t)) at the output of the channel which comprises a differential demodulator, said system including an apparatus comprising first means adapted to divide the N known symbols (ak) and N samples (rk) of the signal (r(t)) at the output of the channel into B blocks of L length with B and L positive integer numbers and B greater than one and said first means (101) being adapted to overlap consecutive blocks having length L of a factor O, said B blocks being expressed by
- B
- =
- N
- -
- L
- L
- -
- O
- +
- 1
- ≥
- N
- L
- wherein O indicates an overlapping factor of consecutive blocks having length L, and second means adapted to calculate the estimation of the signal-to-noise ratio by means of an equation:
- SNR
- =
- (
- L
- -
- 1
- )
- B
- ·
- L
-
- ∑
- b
- =
- 0
- B
- -
- 1
-
-
- 1
- L
-
- ∑
- k
- =
- l
- b
- l
- b
- +
- L
- -
- 1
-
- r
- k
-
- a
- k
- *
-
- 2
- 1
- B
-
- ∑
- b
- =
- 0
- B
- -
- 1
-
- 1
- L
-
- ∑
- k
- =
- l
- b
- l
- b
- +
- L
- -
- 1
-
-
- r
- k
-
- 2
- -
- 1
- B
-
- ∑
- b
- =
- 0
- B
- -
- 1
-
-
- 1
- L
-
- ∑
- k
- =
- l
- b
- l
- b
- +
- L
- -
- 1
-
- r
- k
-
- a
- k
- *
-
- 2
- -
- 1
- L
- wherein lb=(L−O)·b+l where l is an index denoting a position of a first known symbol of the sequence of length N in the packet, rk is a sample of the received signal at the output of the channel correspondent to a known transmitted symbol, ak is the M-DPSK modulated known transmitted symbol, a*k is a complex conjugate of the M-DPSK modulated known transmitted symbol and SNR indicates an estimation of the signal-to-noise ratio.
Dependencies are inferred from the claim text.