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Communication system and signal sending method and apparatus as well as signal receiving method and apparatus thereof

A technology for a signal transmission device and a communication system, which is applied in the directions of preventing/detecting errors through diversity reception, transmission systems, multi-frequency code systems, etc., to achieve the effect of reducing complexity and improving estimation accuracy

Active Publication Date: 2014-05-07
SPREADTRUM SEMICON (NANJING) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing MIMO-OFDM system is difficult to effectively combat the effects of frequency selective fading

Method used

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  • Communication system and signal sending method and apparatus as well as signal receiving method and apparatus thereof
  • Communication system and signal sending method and apparatus as well as signal receiving method and apparatus thereof
  • Communication system and signal sending method and apparatus as well as signal receiving method and apparatus thereof

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Embodiment Construction

[0051] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways than those described here, and those skilled in the art can make similar extensions without departing from the connotation of the present invention. Accordingly, the present invention is not limited to the specific embodiments disclosed below.

[0052] First, a brief description of the basic units in system resource allocation is given. figure 1 It is a schematic diagram of a basic unit in system resource allocation, such as figure 1 As shown, the basic unit of the communication system is a time-frequency two-dimensional unit, and the hor...

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PUM

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Abstract

The invention provides a communication system and signal sending method and apparatus as well as signal receiving method and apparatus thereof. The signal sending method comprises: based on channel information, carrying out channel coding and constellation mapping on each sub-data stream to be sent, carrying out multiple input multiple output sending process on the sub-data stream which has been subjected to the channel coding and constellation mapping, and carrying out OFDM modulation on the sub-data stream which has been subjected to the multiple input multiple output sending process, and outputting OFDM symbol data stream obtained after the OFDM modulation to a transmitting antenna for transmitting. The OFDM modulation comprises the sub-data stream which has been subjected to the multiple input multiple output sending process is inserted with pilot symbols of corresponding antenna ports and is mapped to corresponding physical subcarriers; and subcarriers in element units corresponding to the sub-data streams are expanded to whole or partial system bandwidth to form mapping with the physical subcarriers based on the preset mapping relation. The technical scheme in the invention is capable of effectively resisting the influence of frequency selective fading.

Description

technical field [0001] The present invention relates to the communication field, in particular to a communication system, a signal sending method and device for the communication system, and a signal receiving method and device for the communication system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology utilizes the orthogonality between subcarriers to allow the spectrum of subchannels to overlap each other, effectively improving the spectrum utilization. Through the serial-to-parallel conversion of the data stream, the duration of the data symbol on each subcarrier is greatly increased, and the addition of the cyclic prefix effectively reduces the Inter Symbol Interference (ISI, Inter Symbol Interference). Due to the narrow bandwidth of each sub-carrier, an equalization operation can be performed for each sub-carrier, which greatly simplifies the complexity of the receiver. The OFDM tec...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L1/00H04L1/06
Inventor 闫发军董霄剑
Owner SPREADTRUM SEMICON (NANJING) CO LTD
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