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AssigneeElectronics and Telecommunications Research Institute
InventorsSung-Hyun Hwang, Chang-Joo Kim, Myung-Sun Song, Jung-Sun Um
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Provided is a method of generating a pilot pattern capable of perform adaptive channel estimation, and a method and apparatus of a base station and a method and apparatus of a terminal using the pilot pattern. The pilot pattern selects pilot symbol positions based on distances from pilots of previous orthogonal frequency division multiple access (OFDMA) symbols to a subcarrier position of a current OFDMA symbol in the frequency domain and the time domain, so that a low pilot density is maintained so as to effectively transmit data, and stable channel estimation performance can be obtained even in a bad channel environment. In addition, the minimum burst allocation size is determined according to the channel environment between the base station and the terminal, guaranteeing channel estimation performance suitable for the channel environment, and improving granularity, channel estimation latency, and channel estimation memory size.
A transmitting and receiving method for a terminal, comprising:
A transmitting and receiving apparatus of a terminal, comprising:
Dependencies are inferred from the claim text.
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Local resource management: control channels or signalling for resource management
Arrangements for allocating sub-channels of the transmission path: allocation of pilot signals, i.e. of signals known to the receiver
Time-frequency: the frequencies being orthogonal, e.g. OFDM or DMT
Wireless communication networks
About 3 years 6 months of term left · ends 3 May 2030 (estimated)
The present invention relates to a pilot pattern in a wireless communication system, and more particularly, to a method of generating a pilot pattern capable of minimizing channel estimation performance degradation due to interpolation in a bad channel environment while maintaining a low pilot density, and a transmitting and receiving method capable of adaptively controlling channel estimation performance, granularity, channel estimation latency, channel estimation memory size, and the like, to be suitable for a channel environment between a base station and a terminal, by using the generated pilot pattern.
In a wireless communication system, a received signal is influenced by a channel environment, and thus it is necessary to compensate for the influence of the channel environment. To do this, a predetermined pilot symbol is inserted in the time domain and the frequency domain during data transmission between a transmitter and a receiver in the wireless communication system. The receiver performs channel estimation using two continuous pilot symbols, to compensate for channel deterioration of data symbols between the two pilot symbols.
As a result, when the interval between the pilot symbols decreases, and the density of the pilot symbols increases, the channel estimation performance is improved. However, the ratio of the pilot symbols in a frame increases, which reduces information transmission efficiency.
FIG. 1 shows a pilot pattern used in a downlink partial usage of sub-channels (PUSC) mode in IEEE 802.16e worldwide interoperability for microwave access (WiMAX) standard.
FIG. 2 shows a pilot pattern used in a European telecommunications standards institute (ETSI) digital video broadcasting terrestrial (handheld) (DVB-T (H)) mode.
FIG. 3 is a flowchart for explaining a method of generating a pilot pattern in a transmitter of an orthogonal frequency division multiple access (OFDMA) system according to an embodiment of the present invention.
Exemplary embodiments of the present invention will now be described in detail with reference to the attached drawings. Like reference numerals denote like elements in the drawings. In the description, the detailed description of widely known functions and structures may be omitted so as not to obscure the essence of the present invention.
In addition, when a part “comprises” a component, it means that the part may further comprise other components, and does not exclude any components unless otherwise described.
FIG. 3 (FIG. 3A and FIG. 3B) is a flowchart for explaining a method of generating a pilot pattern in a transmitter of an orthogonal frequency division multiple access (OFDMA) system according to an embodiment of the present invention.