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System for reducing same-frequency interference

A technology of co-channel interference and co-frequency adjacent cells, which is applied in the field of anti-co-frequency interference of TD-SCDMA, can solve problems such as co-channel interference and signal interference, and achieve the effects of simplifying work steps, improving efficiency, and reducing manufacturing costs

Active Publication Date: 2015-01-21
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Application Information

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Problems solved by technology

However, there is also the problem of signal interference in TD-SCDMA: if there is a same-frequency neighbor cell with the same transmission frequency when the cell transmits signals, the cell will suffer from same-frequency interference
The above technical solution does not involve the mixing matrix, and cannot solve the related problems existing in the prior art

Method used

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  • System for reducing same-frequency interference

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Embodiment Construction

[0052] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0053] In the TD-SCDMA system, the same frequency interference is a very important problem that affects the communication quality. In the prior art, a joint detection technology is often adopted to detect and eliminate co-channel interference.

[0054] In the TD-SCDMA communication system, the transmission of signals will occupy multiple time slots; the so-called time slot is the unit of the frame, and different time slots in a frame can be used to transmit different users, different uplink and downlink data or signaling. Each signal includes a training sequence (Midamble code), which is located in the middle of a time slot and between two data blocks, that is, the signal structure of each time slot is arranged as follows figure 2 As shown, from left to right are data block, training sequence,...

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Abstract

The invention discloses a system for reducing same-frequency interference, and belongs to the technical field of TD-SCDMA same-frequency interference prevention. The system comprises a calculation module and an adjustment module. The calculation module constructs a mixed matrix according to the code channels, scrambling codes and channelization codes of a corresponding source region and an adjacent region of the same frequency, carries out rank operation on the mixed matrix, and judges a rank operation result of the mixed matrix. The adjustment module adjusts the code channel or training sequence of the corresponding adjacent region of the same frequency according to the judgment result of the calculation module. The method comprises the steps of constructing a mixed matrix according to the code channels, scrambling codes and channelization codes of a corresponding source region and a corresponding adjacent region of the same frequency, carrying out rank operation on the mixed matrix, judging a rank operation result of the mixed matrix, and adjusting the code channel or training sequence of the corresponding adjacent region of the same frequency according to the judgment result in the step 3. According to the technical scheme, the system has the following beneficial effects: the gain of follow-up multi-user detection can be effectively enhanced; the structure is simple; small change is made on the existing hardware equipment; and the cost is low.

Description

technical field [0001] The invention relates to the technical field of TD-SCDMA anti-interference of the same frequency, in particular to a system for reducing the interference of the same frequency. Background technique [0002] TD-SCDMA is the third-generation communication standard (3G) proposed by China, and its full name is Time Division-Synchronization Code Division Multiple Access (Time Division-Synchronization Code Division Multiple Access). At present, after a series of improvements and promotions, TD-SCDMA The technology is improving day by day and showing great commercial potential. Mobile terminals using the TD-SCDMA communication standard (commonly known as 3G mobile terminals) have gradually entered people's daily lives. [0003] Compared with the traditional communication system, TD-SCDMA communication system has the advantages of strong data transmission capability, high call quality, and large user capacity, and has great development prospects. However, th...

Claims

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Application Information

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IPC IPC(8): H04B1/7103H04B1/7105H04L25/02H04L25/03
Inventor 刘威鑫
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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