Method of generating reference signal in wireless communication system
View Patent ↗A method of generating a reference signal includes acquiring a base sequence and acquiring a reference signal sequence with a length N from the base sequence. Good PAPR/CM characteristics of the reference signal can be kept to enhance performance of data demodulation or uplink scheduling.
1. A method for transmitting a reference signal in a wireless communication system, the method comprising:
generating a plurality of reference signal sequences by cyclically shifting a base sequence x u (n);
mapping each of the plurality of reference signal sequences to a corresponding Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbol among a plurality of SC-FDMA symbols in a subframe, the subframe including the plurality of SC-FDMA symbols in time domain and a plurality of resource blocks in frequency domain, each resource block including N subcarriers; and
transmitting the mapped reference signal sequences in the subframe,
wherein the base sequence x u (n) is expressed by
x u ( n )= e jp(n)π/4 , and
if N=12, at least one of the sets of values provided in the below table is used as a set of values for the phase parameter p(n):
p(0), . . . , p(11)
−1 3 −1 1 1 −3 −3 −1 −3 −3 3 −1
−1 3 1 3 1 −1 −1 3 −3 −1 −3 −1
−1 −3 1 1 1 1 3 1 −1 1 −3 −1
−1 3 −3 3 −1 3 3 −3 3 3 −1 −1.
2. The method of claim 1 , wherein, if N=24, at least one of the sets of values provided in the below table is used as a set of values for the phase parameter p(n):
p(0), . . . , p(23)
−1 −3 3 −1 −1 −1 −1 1 1 −3 3 1 3 3 1 −1 1 −3 1 −3 1 1 −3 −1
−1 −3 3 −3 −3 −3 −1 −1 −3 −1 −3 3 1 3 −3 −1 3 −1 1 −1 3 −3 1 −1
−1 −1 1 −3 1 3 −3 1 −1 −3 −1 3 1 3 1 −1 −3 −3 −1 −1 −3 −3 −3 −1
−1 −3 1 1 3 −3 1 1 −3 −1 −1 1 3 1 3 1 −1 3 1 1 −3 −1 −3 −1
−1 −3 −1 −1 1 −3 −1 −1 1 −1 −3 1 1 −3 1 −3 −3 3 1 1 −1 3 −1 −1.
3. The method of claim 1 , wherein the reference signal sequences are demodulation reference signals used for demodulating uplink data.
4. A mobile communication terminal configured to transmit a reference signal in a wireless communication system, comprising:
an antenna;
a communications module operatively connected to the antenna; and
a processor operatively connected to the communications module, the processor configured to
generate a plurality of reference signal sequences by cyclically shifting a base sequence x u (n);
map each of the plurality of reference signal sequences to a corresponding Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbol among a plurality of SC-FDMA symbols in a subframe, the subframe including the plurality of SC-FDMA symbols in time domain and a plurality of resource blocks in frequency domain, each resource block including N subcarriers; and
transmit the mapped reference signal sequences in the subframe,
wherein the base sequence x u (n) is expressed by
x u ( n )= e jp(n)π/4 , and
if N=12, at least one of the sets of values provided in the below table is used as a set of values for the phase parameter p(n):
p(0), . . . , p(11)
−1 3 −1 1 1 −3 −3 −1 −3 −3 3 −1
−1 3 1 3 1 −1 −1 3 −3 −1 −3 −1
−1 −3 1 1 1 1 3 1 −1 1 −3 −1
−1 3 −3 3 −1 3 3 −3 3 3 −1 −1.
5. The mobile communication terminal of claim 4 , wherein, if N=24, at least one of the sets of values provided in the below table is used as a set of values for the phase parameter p(n):
p(0), . . . , p(23)
−1 −3 3 −1 −1 −1 −1 1 1 −3 3 1 3 3 1 −1 1 −3 1 −3 1 1 −3 −1
−1 −3 3 −3 −3 −3 −1 −1 −3 −1 −3 3 1 3 −3 −1 3 −1 1 −1 3 −3 1 −1
−1 −1 1 −3 1 3 −3 1 −1 −3 −1 3 1 3 1 −1 −3 −3 −1 −1 −3 −3 −3 −1
−1 −3 1 1 3 −3 1 1 −3 −1 −1 1 3 1 3 1 −1 3 1 1 −3 −1 −3 −1
−1 −3 −1 −1 1 −3 −1 −1 1 −1 −3 1 1 −3 1 −3 −3 3 1 1 −1 3 −1 −1.
6. The mobile communication terminal of claim 4 , wherein the reference signal sequences are demodulation reference signals used for demodulating uplink data.