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Radio transmission apparatus and method of inserting guard interval

A radio transmission and guard interval technology, applied in electrical components, baseband systems, digital transmission systems, etc., can solve problems such as degradation of reception characteristics, achieve flexible transmission processing, and prevent degradation of reception characteristics

Inactive Publication Date: 2008-01-02
FUJITSU LTD
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Problems solved by technology

[0029] However, when only the upper limit of adjacent band radiation is specified without imposition of a common time window, since it is considered to design the transmitting station by selecting a method for reducing adjacent band radiation according to the supported transmission rate, limitation of circuit size, etc. 100, so under this condition, it is easy to assume that the imposition of the time window varies depending on the sending station 100, whereby, as mentioned above, the deterioration of the reception characteristics will occur

Method used

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  • Radio transmission apparatus and method of inserting guard interval
  • Radio transmission apparatus and method of inserting guard interval
  • Radio transmission apparatus and method of inserting guard interval

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[0175] The third embodiment describes the case where, unlike the first and second embodiments, as in the uplink in the mobile communication system, the receiving station 30 responds to calls from a plurality of transmitting stations 10 (for example, transmitting stations #1 to #K: K is an integer equal to or greater than 2) for demodulation and decoding.

[0176] When a transmission system (such as an OFDM scheme) using FFT in combination with cyclic prefix 61 and cyclic suffix 62 is applied to the uplink to prevent interference between transmitting stations 10, it is necessary to receive signals from transmitting station 10 substantially synchronously by receiving station 30. signal of. In view of this, the transmission timing of the signal from each transmission station 10 is controlled based on the time difference between the target value of the reception timing of the direct wave from each transmission station 10 and the actual reception timing.

[0177] Therefore, each t...

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Abstract

A radio transmission apparatus includes: a guard interval insertion unit that inserts a guard interval in every data block of a transmission data signal; a waveform shaping unit that performs a signal attenuation processing in a time period that includes a boundary of a signal block in which the guard interval has been inserted; and a controller that controls an insertion period of the guard interval by the guard interval insertion unit such that the data block is located in a time period exclusive of the time period which is a signal attenuation period by the waveform shaping unit. By this, in an environment where a signal to which a window function (band limitation) is applied may be received, while the guard intervals are effectively utilized, degradation of reception characteristics due to influence of the band limitation is prevented.

Description

technical field [0001] The invention relates to a radio transmission device and a method of inserting a guard interval. The present invention relates to techniques suitable for communication schemes for, for example, attaching guard intervals to transmitted data blocks. Background technique [0002] For the radio access scheme of next-generation mobile communication, consider a transmission scheme represented by OFDM (Orthogonal Frequency Division Multiplexing), in which a guard interval (GI) such as a cyclic prefix is ​​added to a signal, and in the frequency domain Perform signal processing. A well-known feature of this transmission scheme is the high tolerance to radio channels in a strongly frequency-selective wideband. [0003] Next, the principle of the OFDM scheme is described. [0004] Fig. 15 is a block diagram showing an exemplary structure of main parts focusing on a radio transmission device employing the OFDM scheme. The radio transmission device 100 shown i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2607H04L25/03834H04L27/2626H04L27/26265H04L27/26H04B1/02
Inventor 关宏之实川大介
Owner FUJITSU LTD
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