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Subcarrier allocation apparatus and method, subcarrier de-allocation apparatus and method in ofdm system

Jun-Woo Kim, +4 more
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TLDR
In this article, a logical index generator (142) and an intermediate index converter (144) were used to allocate a data subcarrier to a physical index, the logical index being included with only data sub-carriers and the physical index indicating a location of substantial subcarriers within a symbol.
Abstract: 
A subcarrier allocating apparatus allocating data to be transmitted to a plurality of orthogonal subcarriers in an orthogonal frequency division multiplexing (OFDM) system, the apparatus including: a logical index generator (142) generating a logical index for allocating a data subcarrier to a physical index, the logical index being included with only data subcarriers and the physical index indicating a location of a substantial subcarrier within a symbol; an intermediate index converter (144) converting the logical index into an intermeidate index by performing a given operation on the generated logical index and a pilot location constant; and a physical index converter (146) converting the intermediate index into a physical index based on the number of data subcarriers on the left and right sides of a null subcarrier for insertion of a guard interval formed by the null subcarrier.

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Patent

Radio communication system, radio communication method, radio communication device, reception device, and program

Kazunari Yokomakura, +7 more
TL;DR: In this article, a communication device comprising a transmission unit and a reception unit is configured to transmit, to a first communication device, first information indicating a first set of subcarriers comprising of a plurality of sub-carriers, and to a second communication devices, second information indicating that a second set of subsets can overlap with at least a portion of the first subsets in a time frame.
Patent

Transmitting apparatus and receiving apparatus and controlling method thereof

Jae-Hyeon Bae, +2 more
TL;DR: In this article, a frame generator is used to generate a frame including a plurality of orthogonal frequency-division multiplexing (OFDM) symbols and a guard interval inserter is provided.
Patent

Device, system and method of communicating a wireless communication orthogonal-frequency-division-multiplexing signal

Alexey Khoryaev, +3 more
TL;DR: In this paper, a wireless communication device may communicate a wireless communications OFDM signal including a plurality of data subcarriers carrying data, at least one pilot subcarrier carrying a reference, predefined, value, and a number of zero sub-carriers, carrying a zero value, surrounding the pilot subcrier and separating between the pilot and the data subcriers.
Patent

Transmitter, receiver, transmission method, and reception method

Toshiaki c, +9 more
TL;DR: In this article, a null subcarrier allocation unit allocates null sub-carriers based on a priority and a signal to each sub-subcarrier, and the priority is a ranking predetermined with the receiver.
Patent

Self-adapting subcarrier distributing method for SIM-OFDM system

Peng Lan, +5 more
TL;DR: In this article, a self-adapting subcarrier distribution method for an SIM-OFDM system is proposed, which adopts nonergodic self-adaption to search the optimal self-ADAption, and can substantially reduce the calculating complexity.
References
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Proceedings ArticleDOI

A real-time sub-carrier allocation scheme for multiple access downlink OFDM transmission

Cheong Yui Wong, +3 more
TL;DR: To deal with the frequently changing channel characteristic of a fast time-varying multipath fading channel, a heuristic algorithm based on constructive assignment and iterative improvement is proposed which can give out a valid solution in real time.
Patent

Apparatus for OFDMA transmission and reception for coherent detection in uplink of wireless communication system and method thereof

Yun Hee Kim, +2 more
TL;DR: In this article, a time-frequency resource of a slot interval including OFDM symbols is divided into traffic channels and shared among the subscribers, the traffic channel including resource blocks uniformly distributed in the whole transmit frequency band, the resource block including consecutive subcarriers of consecutive received symbols having at least one inserted pilot symbol.
Patent

Sub-carrier allocation for OFDM

Christian Dubuc, +2 more
TL;DR: In this paper, the available sub-carriers in an OFDM symbol window are divided into N groups of subcarriers and each group will be associated with sub-bands.
Patent

Power control and scheduling in an OFDM system

Ayman Fawzy Naguib, +2 more
TL;DR: In this article, a power control and scheduling of sub-carriers in an OFDM communication system is presented. But the system is limited to the number of subcarriers that can be allocated to the communication link.
Patent

Broadband multicarrier transmitter with subchannel frequency diversity for transmitting a plurality of spatial streams

Qinghua Li, +2 more
TL;DR: In this paper, a multicarrier transmitter assigns for each of a plurality of spatial channels, sets of the constellation symbols to subcarriers of each subchannel for enhanced frequency diversity.