Method and apparatus for reference signal generation in wireless communication system
AssigneeNEC Corporation
InventorsYoshikazu Kakura, Kengo Oketani
Life of this patent
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Abstract
To provide a reference signal generation method and apparatus capable of obtaining many reference signal sequences having excellent properties. CAZAC sequences that satisfy the condition that the absolute value (|N−L|) of a difference between a sub-carrier number N in a resource block and a CAZAC sequence length L is not larger than a threshold value K are selected, and a sequence having a largest among greatest prime factors among the prime factors constituting the sequence length(s) is further selected from the initially selected sequences. Then, a reference signal sequence(s) is generated from a selected CAZAC sequence.
Claims16
A method for generating a reference signal, in which the reference signal is generated using at least one CAZAC (Constant Amplitude Zero Auto-Correlation) sequence to at least one resource block, comprising:
- selecting at least one first CAZAC sequence length that satisfies a condition that an absolute value of a difference between a predetermined sub-carrier number in said at least one resource block and a CAZAC sequence length number is not larger than a predetermined threshold value;
- selecting at least one second CAZAC sequence length having a largest among greatest prime factors constituting each sequence length from said at least one first CAZAC sequence length;
- and
- generating the reference signal from said at least one CAZAC sequence of a selected one of said at least one second CAZAC sequence length.
An apparatus for generating a reference signal, which generates the reference signal using CAZAC (Constant Amplitude Zero Auto-Correlation) sequences, comprising:
- CAZAC sequence selecting means for selecting a CAZAC sequence length having a largest among greatest prime factors constituting each sequence length from at least one CAZAC sequence length that satisfy a condition that an absolute value of a difference between a predetermined sub-carrier number and a CAZAC sequence length number is not larger than a predetermined threshold value;
- and
- reference signal generating means for generating said reference signal from a CAZAC sequence of said selected CAZAC sequence length.
A wireless communication apparatus in a wireless communication system that performs wireless communication by multiplexing a transmission signal with a reference signal, comprising:
- reference signal generating means for generating the reference signal by allocating at least one reference signal sequence generated from at least one CAZAC (Constant Amplitude Zero Auto-Correlation) sequence to at least one resource block;
- and
- communicating means for communicating with other wireless apparatuses using said reference signal;
- wherein
- said reference signal generating means includes:
- CAZAC sequence selecting means for selecting a CAZAC sequence length having a largest among greatest prime factors constituting each sequence length from at least one CAZAC sequence length that satisfy a condition that an absolute value of a difference between a predetermined sub-carrier number and a number of the at least one CAZAC sequence length is not larger than a predetermined threshold value;
- and
- reference signal sequence generating means for generating said reference signal sequence from a CAZAC sequence of said selected CAZAC sequence length.
A wireless communication system that performs wireless communication by multiplexing at least one of a transmission reference signal and a reception reference signal between a transmission device and a reception device, wherein
- said transmission device comprises:
- transmission reference signal generating means for generating the transmission reference signal by allocating at least one transmission reference signal sequence generated from at least one CAZAC (Constant Amplitude Zero Auto-Correlation) sequence to at least one resource block;
- and
- transmitting means for multiplexing a transmission signal and said transmission reference signal and transmitting said transmission signal and said transmission reference signal to the reception device;
- said reception device comprises:
- reception reference signal generating means for generating the reception reference signal by allocating at least one reception reference signal sequence generated from another at least one CAZAC sequence to said at least one resource block;
- and
- receiving means for receiving said transmission signal and said transmission reference signal from said transmission device using said reception reference signal;
- said transmission reference signal generating means comprising:
- transmission CAZAC sequence selecting means for selecting a transmission CAZAC sequence length having a largest among greatest prime factors constituting each sequence length from at least one CAZAC sequence length that satisfy a condition that an absolute value of a difference between a predetermined sub-carrier number in said at least one resource block and a number of the at least one CAZAC sequence length is not larger than a predetermined threshold value;
- and
- transmission reference signal sequence generating means for generating said transmission reference signal sequence from a CAZAC sequence of said selected transmission CAZAC sequence length;
- said reception reference signal generating means comprising:
- reception CAZAC sequence selecting means for selecting a reception CAZAC sequence length having a largest among greatest prime factors constituting each sequence length from the at least one CAZAC sequence length that satisfy the condition that the absolute value of the difference between the predetermined sub-carrier number in said at least one resource block and the CAZAC length number is not larger than the predetermined threshold value;
- and
- reception reference signal sequence generating means for generating said reception reference signal sequence from a CAZAC sequence of said selected reception CAZAC sequence length;
- and
- at least one of said transmission and reception reference signal generating means is preset so that said transmission CAZAC sequence and said reception CAZAC sequence are identical.
A mobile communication system that performs wireless communication by multiplexing a reference signal between a plurality of user equipments and a base station, wherein
- said base station and each of said plurality of user equipments comprise:
- reference signal generating means for generating the reference signal by allocating at least one reference signal sequence generated from at least one CAZAC (Constant Amplitude Zero Auto-Correlation) sequence to at least one resource block;
- and
- communicating means for communicating using said reference signal;
- said reference signal generating means comprises:
- CAZAC sequence selecting means for selecting a CAZAC sequence length having a largest among greatest prime factors constituting each sequence length from at least one CAZAC sequence length that satisfy a condition that an absolute value of a difference between a predetermined sub-carrier number in said at least one resource block and a number of the at least one CAZAC sequence length is not larger than a predetermined threshold value;
- and
- reference signal sequence generating means for generating said reference signal sequence from said at least one CAZAC sequence of said selected CAZAC sequence length;
- and
- identical reference signal sequences are used between said base station and each user equipment by having said base station specify said at least one resource block and said at least one CAZAC sequence, for each user equipment, used for the communication with the user equipment.
A base station in a mobile communication system that performs wireless communication by multiplexing a reference signal, comprising:
- reference signal generating means for generating the reference signal by allocating at least one reference signal sequence generated from at least one CAZAC (Constant Amplitude Zero Auto-Correlation) sequence to at least one resource block;
- and
- communicating means for communicating with each user equipment using said reference signal;
- wherein
- said reference signal generating means includes:
- CAZAC sequence selecting means for selecting a CAZAC sequence length having a largest among greatest prime factors constituting each sequence length from at least one CAZAC sequence length that satisfy a condition that an absolute value of a difference between a predetermined sub-carrier number in said at least one resource block and a number of the at least one CAZAC sequence length is not larger than a predetermined threshold value;
- and
- reference signal sequence generating means for generating said reference signal sequence from a CAZAC sequence of said selected CAZAC sequence length.
A user equipment in a mobile communication system that performs wireless communication by multiplexing a reference signal, comprising:
- reference signal generating means for generating the reference signal by allocating at least one reference signal sequence generated from at least one CAZAC (Constant Amplitude Zero Auto-Correlation) sequence to at least one resource block;
- and
- communicating means for communicating with a base station using said reference signal;
- wherein
- said reference signal generating means includes:
- CAZAC sequence selecting means for selecting a CAZAC sequence length having a largest among greatest prime factors constituting each sequence length from at least one CAZAC sequence length that satisfy a condition that an absolute value of a difference between a predetermined sub-carrier number in said at least one resource block and a number of the at least one CAZAC sequence length is not larger than a predetermined threshold value;
- and
- reference signal sequence generating means for generating said reference signal sequence from a CAZAC sequence of said selected CAZAC sequence length.
A non-transitory computer-readable storage medium that stores a program, in an apparatus that generates a reference signal by allocating at least one CAZAC (Constant Amplitude Zero Auto-Correlation) sequence to at least one resource block, having a computer execute:
- selecting at least one first CAZAC sequence length that satisfies a condition that an absolute value of a difference between a predetermined sub-carrier number in said at least one resource block and a CAZAC sequence length number is not larger than a predetermined threshold value;
- selecting at least one second CAZAC sequence length having a largest among greatest prime factors constituting each sequence length from said at least one first CAZAC sequence length;
- and
- generating the reference signal from said at least one CAZAC sequence of a selected one of said at least one second CAZAC sequence length.
Dependencies are inferred from the claim text.