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Estimiting method of signal interference ratio of forward basic service channel in FDD mode CDMA system

A technology of signal-to-interference ratio and basic service, which is applied in the field of signal-to-interference ratio estimation algorithm of forward basic service channel, and can solve problems such as the inability to estimate the mean value and variance of service symbol bits

Inactive Publication Date: 2006-04-12
ZHEJIANG HUALI COMM TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] (1) For the forward basic traffic channel, since the symbol bits of the traffic are unknown, the modulation component of the traffic symbol chips contained in the QPSK signal is also unknown, so the mean value and variance of the traffic symbol bits cannot be estimated (later or the energy of noise interference);

Method used

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  • Estimiting method of signal interference ratio of forward basic service channel in FDD mode CDMA system
  • Estimiting method of signal interference ratio of forward basic service channel in FDD mode CDMA system
  • Estimiting method of signal interference ratio of forward basic service channel in FDD mode CDMA system

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Embodiment 1

[0123] Embodiment 1: with reference to attached figure 1 . attached figure 1 Described is the closed-loop power control process of the forward fundamental traffic channel. In addition to sending traffic signals (in the case of communicating with the mobile station) to the mobile station (terminal), the CDMA base station will also continuously send pilot signals, synchronization signals, and common control signals to the mobile station.

[0124] Various signals sent by the base station generally reach the mobile station through multipath fading. The mobile station uses a Rake receiver to extract the main components of the multipath transmitted signal. Each FINGER of the Rake receiver extracts a signal of a specific transmission path (corresponding to a specific time delay). A rake receiver aligns the phases of multiple FINGER output signals so that multiple FINGER outputs can be combined into one signal.

[0125]In order to implement power control on the forward (downlin...

Embodiment 2

[0127] Embodiment 2: with reference to attached figure 2 . attached Figure II Among them, the radio signal received by the antenna (transmitted by the CDMA base station) is input to different Fingers according to different delays as the original I and Q signals. These original I and Q signals include business I and Q signals, and pilot I and Q signals.

[0128] The original I and Q signals of each Finger first pass through a quadrature demodulator (QDS) to realize CDMA orthogonal descrambling code processing. For cdma2000, PN (pseudo-random code) code is used for descrambling. For WCDMA, the Gold code is used for descrambling.

[0129] The signal descrambled by each Finger is divided into two paths, and one path is sent to the service signal recovery circuit to extract noisy service error signals. The other way is sent to the pilot signal recovery circuit to take out the noisy pilot signal. Then, for the service signal and the pilot signal, the outputs of different Fi...

Embodiment 3

[0134] Embodiment 3: with reference to attached image 3 . attached Figure three It is a specific flow chart of estimating the SIR of the forward fundamental channel by using the pilot combination method in the actual mobile station. In this process, the pilot combination method described above is used to estimate the SIR of the forward basic channel. Such as:

[0135] (1) In the step "calculate the energy mean and variance of the combined pilot symbols in the PCG", calculate the mean and variance of the combined pilot signals; (calculate with EQ6 and EQ7 respectively).

[0136] (2) The mean value of the pilot signal is used to judge whether the power control symbol (PCB) in a PCG period can be used to calculate the estimated Eb of symbol energy, which is in the step "PCB energy<=0.25*combined pilot symbol energy mean value?" It can be seen; (the mean value of the pilot signal is the calculation result of EQ7).

[0137] (3) The variance of the pilot signal is used as an ...

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Abstract

Two algorithms for estimating signal to jamming ratio of forward basic service channel in CDMA system of FDD mode includes the first algorithm utilizing pilot frequency combination to estimate said signal to jamming ratio as using symbol amplitude variance as interference signal power and using symbol amplitude squared value as signal power to calculate signal to jamming ratio Eb / Nt ; the second algorithm utilizing PCB ONLY method to calculate out a numbers of instantaneous signal to jamming ratios by using I, Q signal amplitude in each PCB and then counting out mean value of said ratios to obtain signal to jamming ratio of forward basic service channel .

Description

Technical field: [0001] The present invention proposes two forward (downlink) basic service channel signal-to-interference ratio estimation algorithms in the CDMA system (including cdma2000 and UMTS two kinds of systems) of FDD mode, and is used for realizing the forward (downlink) basic service in the CDMA system of FDD mode Inner-loop and outer-loop power control of the channel. The invention belongs to the technical field of mobile communication. Background technique: [0002] The estimation algorithm of the signal-to-interference ratio proposed by the invention is directly related to the power control technology of the forward (downlink) basic service channel of the FDD mode CDMA system. [0003] Power control technology is the core technology of CDMA system. The CDMA system is a self-disturbing system, and all mobile users occupy the same bandwidth and frequency. If the spreading codes used by the system are not completely orthogonal (the address codes used in the act...

Claims

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Application Information

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IPC IPC(8): H04B7/005
Inventor 藏侃许晓斌彭文振
Owner ZHEJIANG HUALI COMM TECH
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