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Interference signal eliminating apparatus and method of eliminating interference signal

A technology for interfering with signals and signals, applied in synchronous signal speed/phase control, wireless communication, multiplexing communication, etc., can solve the problem of not being able to generate replica signals, not being able to determine the spreading factor of data channel signals, and not being able to determine data channels Signal symbol rate and other issues

Inactive Publication Date: 2002-07-10
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Here, in the case of using a communication protocol in which the symbol rate (that is, the transmission rate) of a signal changes every frame in the communication system, since the spreading factor also changes with the change of the symbol rate, in the above-mentioned conventional In the interference signal canceling device, if the demodulation of the signal of one frame is not completed, the replica signal of the frame cannot be generated
[0006] Specifically, in the case where the symbol rate of the data channel signal changes every frame, such as figure 1 As shown, the above-mentioned conventional interference signal canceling apparatus cannot determine the code of the data channel signal until the TFCI (Transport Format Combination Indicator: transmission frame information) of the control channel signal with a fixed symbol rate is received in 15 slots (1 frame). meta rate
In other words, the above-mentioned existing interference signal canceling apparatus cannot determine the spreading factor of the data channel signal before receiving the TFCI of the control channel signal in 15 time slots
That is, the above-mentioned conventional interference signal canceling apparatus cannot generate a replica signal until receiving the TFCI of the control channel signal in 15 slots
Therefore, in the above-mentioned conventional interference signal canceling apparatus, there is a problem that the delay until the replica signal is generated is at least 1 frame, and the delay time is very long.

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  • Interference signal eliminating apparatus and method of eliminating interference signal
  • Interference signal eliminating apparatus and method of eliminating interference signal
  • Interference signal eliminating apparatus and method of eliminating interference signal

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Embodiment 1

[0024] figure 2 A block diagram of main parts showing the schematic structure of the interference signal canceling apparatus according to Embodiment 1 of the present invention. In the following description, a case where the number of stages (the number of stages) of the interference signal canceling apparatus is three, the number of communication partners is three, and the number of multipaths is three will be described as an example. Each of the above-mentioned numbers is an example, and the present invention is not limited to these numbers.

[0025] Such as figure 2 As shown, since the first stage and the second stage have the same structure, the same structural parts are given the same reference numerals, and the description of the second stage is omitted.

[0026] exist figure 2 , the received signal is input to ICU (Interference Canceling Unit: Interference Canceling Unit) 102 - 1 to 3 and delayer 103 through antenna 101 . Delay unit 103 delays the reception signal...

Embodiment 2

[0058] The interference signal canceling apparatus and the interference signal canceling method according to Embodiment 2 of the present invention determine the symbol rate of the received signal by comparing the average value in a predetermined interval of correlation values.

[0059] Figure 7 A block diagram of main parts showing a schematic configuration of the data channel correlation value calculation unit of the interference signal canceling apparatus according to Embodiment 2 of the present invention. The same components as those of the data channel correlation value calculation unit in the first embodiment are given the same reference numerals, and detailed descriptions are omitted.

[0060] exist Figure 7 Among them, the averaging units 601 to 604 average the correlation values ​​output from the data channel despreading unit 501 and the synthesizing units 502 to 504 in a predetermined interval (for example, one slot interval). The determination unit 505 compares eac...

Embodiment 3

[0063] The interference signal cancellation device and interference signal cancellation method according to Embodiment 3 of the present invention determine the symbol rate of the data channel signal according to the correlation value of the data channel signal reaching the threshold obtained from the correlation value of the control channel signal.

[0064] Figure 8 A block diagram of main parts showing the schematic structure of the ICU of the first stage and the second stage of the interference signal canceling device according to the third embodiment of the present invention. Figure 9 A block diagram of main parts showing a schematic configuration of a data channel correlation value calculation unit of an interference signal canceling apparatus according to Embodiment 3 of the present invention. The same reference numerals are assigned to the same structures as those of the ICU and the data channel correlation value calculation unit of the first embodiment, and detailed e...

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Abstract

A correlation-value calculation unit (201) for data channel calculates a correlation value per symbol for each symbol rate that is a candidate of a specific symbol rate for a data channel signal of the specific symbol rate, the symbol rate of the data channel is determined from the correlation values, and a re-spreading unit (208) produces a replica signal by performing despreading with a diffusion code corresponding to the determined symbol rate.

Description

technical field [0001] The present invention relates to an interference signal cancellation device and an interference signal cancellation method used in a CDMA (Code Division Multiple Access: Code Division Multiple Access) mobile communication system. Background technique [0002] In the CDMA mobile communication system, since the signals of multiple users are transmitted in the same frequency band, the signals received by the receiving end apparatus are interfered by various signals, and the characteristics are deteriorated. [0003] In the past, as a device for canceling interference signals, 1) Sawahashi, Miki, Ando, ​​and Tsuguchi proposed "Channel-by-Channel Estimation Type Serial Canceller Using Pilot Symbols in DS-CDMA (Society of Electronics, Information and Communications, Technical Report of the Wireless Communication System Research Society, RCS95-50, July 1995)", 2) Yoshida and Toshikawa proposed "CDMA multi-stage interference canceller (e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J13/00H04B1/10H04B1/7107H04B7/26H04L7/08H04W76/02H04W88/02H04W88/08
CPCH04B2201/70703H04B1/71075
Inventor 三好宪一宫和行
Owner PANASONIC CORP