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Communication joint transmission (JT) technology

A joint transmission and technology technology, applied in the direction of baseband system components, transmitter/receiver shaping network, etc., can solve the problems that affect the downlink performance and system capacity, and can not be used, so as to increase the useful data rate and Effects of system capacity, low power consumption, and low price

Inactive Publication Date: 2012-11-28
张灵芝
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

JD technology requires the receiver to estimate the impulse response of the channel and complete complex detection algorithms. For the uplink of the mobile communication system, it is feasible for the base station receiver to implement these complex processes, but for the downlink mobile phone receiver, due to the Due to limitations in processing power and price, JD technology generally cannot be used, which seriously affects downlink performance and system capacity

Method used

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Examples

Experimental program
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Embodiment Construction

[0006] The following research methods and technical routes are adopted respectively:

[0007] (1), the key problem to be solved is to reduce the complexity of the JT algorithm to be practical, we will use parallel processing technology, so that the base station can estimate the channel and judge the transmission signal for all the mobile stations it serves at the same time;

[0008] (2) Since the frame structure of the TD-SCDMA physical layer is very special (5ms subframe, 7 time slots, 2 switching points), and uplink synchronization is required at the same time, the special problem to be solved is to quickly implement the JT algorithm for this special frame structure , and has no effect on other aspects including uplink synchronization, and is mainly improved based on the fast and low-complexity algorithm obtained in (1);

[0009] (3) Since the frequency interval between the uplink and downlink of the FDD system is very far, and the characteristics of the uplink channel are q...

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Abstract

The invention relates to a communication joint transmission (JT) technology. By the implementation of the JT technology, a special training sequence of a user is not required by downlink channel estimation, so that an available data rate and system capacity provided by a downlink are improved; and in addition, each mobile station can finish data detection only through a simple linear filter, so that the processing of a mobile phone can be simplified, and the user requirements of miniaturization, low power consumption and low cost can be met. Therefore, the communication JT technology is academically significant, and has high application value.

Description

【Technical field】 [0001] The present invention relates to a joint communication transmission JT technology, especially it can utilize the advantage that the impulse response of the mobile wireless channel in the uplink and downlink of the TDD mode is approximately the same, only the base station in the uplink estimates the channel, and the downlink uses The estimated channel impulse response value, on the other hand, also assigns the complex detection algorithm in the mobile station, that is, the task of judging the transmission signal, to the base station to complete. 【Background technique】 [0002] CDMA mobile communication system is an interference-limited system, in which multiple access interference (MAI) is particularly serious, so it is very important to reduce multiple access interference and improve system capacity. The current technical solution is to use joint detection (JD) technology to reduce MAI. JD technology requires the receiver to estimate the impulse resp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 张灵芝
Owner 张灵芝
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