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

A signal transmission device, communication system technology, applied in the direction of error prevention/detection through diversity reception, transmission system, multi-frequency code system, etc., to achieve the effects of improving estimation accuracy, high throughput, and reducing complexity

Active Publication Date: 2014-05-07
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing MIMO-OFDM system is difficult to effectively combat frequency selective fading and interference from co-frequency adjacent cells

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

[0042] 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.

[0043] In existing MIMO-OFDM systems, resource scheduling is generally used to solve co-frequency adjacent cell interference, that is, different frequency domain resources are allocated to users at the edge of the cell to avoid co-channel interference, but this method will It increases the scheduli...

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PUM

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Abstract

The invention provides a communication system and a signal sending method and apparatus as well as signal receiving method and apparatus thereof. The signal sending apparatus comprises a coding modulation unit, a first processing unit and an OFDM modulation unit, wherein the coding modulation unit is suitable for, based on channel information, carrying out channel coding and constellation mapping on each sub-data stream to be sent; the first processing unit is suitable for carrying out spreading spectrum and multiple input multiple output sending process; and the OFDM modulation unit is suitable for carrying out OFDM modulation and outputting OFDM symbol data stream obtained after the OFDM modulation to a transmitting antenna for transmitting. The signal receiving apparatus comprises an OFDM demodulation unit, a second processing unit and a demodulation decoding unit, wherein the OFDM demodulation unit is suitable for carrying out OFDM demodulation on baseband signals received by receiving antennas; the second processing unit is suitable for carrying out multiple input multiple output receiving process and de-spreading spectrum operation; and the demodulation decoding unit is suitable for carrying out constellation de-mapping and channel decoding, and thus target data is obtained. The technical scheme of the invention is capable of effectively resisting frequency selective fading and the interference of co-frequency neighbor cells, so that the communication system is allowed to have high stability, high throughput and co-frequency networking capability.

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 COMM (SHANGHAI) CO LTD
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