System and method for pilot design for data transmitted in wireless networks
AssigneeIndustrial Technology Research Institute
InventorsYu-Tao HSIEH, Jen-Yuan HSU, Pang-An TING, Lai-Huei WANG
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Abstract
A method for pilot design for data to be transmitted by an orthogonal frequency-division multiplexing (OFDM) based communication system, the data being represented by a plurality of OFDM symbols. The method includes allocating pilot symbols for a data stream to be included in ones of the OFDM symbols; and performing a frequency shift on at least one of the OFDM symbols, to reduce frequency distance disparities among the pilot symbols.
Claims36
A method for pilot design for data to be transmitted by an orthogonal frequency-division multiplexing (OFDM) based communication system, the data being represented by a plurality of OFDM symbols, the method comprising:
- allocating pilot symbols for a data stream to be included in ones of the OFDM symbols;
- and
- performing a frequency shift on at least one of the OFDM symbols, to reduce frequency distance disparities among the pilot symbols.
A transmitter to transmit data using a plurality of orthogonal frequency-division multiplexing (OFDM) symbols, the OFDM symbols including allocated pilot symbols for a data stream, the transmitter comprising:
- an inverse fast Fourier transform (IFFT) component configured to receive the OFDM symbols and to generate time-domain parallel signals;
- a parallel-to-serial conversion component configured to perform parallel-to-serial conversion of the parallel signals to generate serial signals;
- a cyclic prefix insert component configured to add cyclic prefixes in the serial signals to reduce signal interference on a receiver side;
- and
- a frequency shift component configured to perform a frequency shift on at least one of the OFDM symbols, to reduce frequency distance disparities among the pilot symbols for the data stream.
A receiver to receive signals including a plurality of orthogonal frequency-division multiplexing (OFDM) symbols, the OFDM symbols including allocated pilot symbols for a data stream, the receiver comprising:
- a frequency shift component configured to perform a frequency shift on at least one of the OFDM symbols;
- a cyclic prefix removal component configured to remove cyclic prefixes from the received signals to generate serial signals;
- a serial-to-parallel conversion component configured to perform serial-to-parallel conversion of the serial signals to generate parallel signals;
- and
- a fast Fourier transform (FFT) component configured to receive the parallel signals and to recover the OFDM symbols.
A method for pilot design for data to be transmitted by an orthogonal frequency-division multiplexing (OFDM) based communication system, the data being represented by a plurality of OFDM symbols, the method comprising:
- allocating, when the communication system is moving at a relatively high speed, a plurality of groups of pilot symbols for at least one data stream based on a pilot symbol allocation for use when the communication system is moving at a relatively low speed, such that the communication system transmits a reduced number of data streams when moving at the relatively high speed.
An apparatus for pilot design for data to be transmitted by an orthogonal frequency-division multiplexing (OFDM) based communication system, the data being represented by a plurality of OFDM symbols, the apparatus being configured to:
- allocate, when the communication system is moving at a relatively high speed, a plurality of groups of pilot symbols for at least one data stream based on a pilot symbol allocation for use when the communication system is moving at a relatively low speed, such that the communication system transmits a reduced number of data streams when moving at the relatively high speed.
A method for pilot design for data to be transmitted by an orthogonal frequency-division multiplexing (OFDM) based communication system, the method comprising:
- generating, based on an original pilot pattern, a low-mobility pilot pattern represented by a first plurality of OFDM symbols in a first resource block, for use when the communication system is at a relatively low speed;
- and
- generating, based on the low-mobility pilot pattern, a high-mobility pilot pattern represented by a second plurality of OFDM symbols in a second resource block, for use when the communication system is at a relatively high speed;
- wherein generating the low-mobility pilot pattern includes allocating at least a first pilot symbol for a first data stream and a second pilot symbol for a second data stream to adjacent subcarriers of the communication system, the first and second pilot symbols being in a same one of the first plurality of OFDM symbols.
Dependencies are inferred from the claim text.