Innowireless Co., Ltd.

Kyoung Hwan Ju

Jin Soup Joung

Yong Hoon Lim

Joo Hyeong Lee

Young Su Kwak

Sung Chan Choi

Hyo Bin Yim

A spectrum analyzer having a memory function to adopt a digital-data-based frequency sweep scheme while achieving performance comparable to performance of a high-speed FFT spectrum analyzer, and a method of controlling the spectrum analyzer, in which the spectrum analyzer includes: an ADC for converting a BWP signal, which is at least one analog unit frequency band signal, into a digital data sample at a predetermined sample rate according to a span set by a user; a digital sweep part for sweeping the data sample passed through the ADC while digitally decimating the data sample through a decimation processing block having a two-stage cascaded structure, and processing the swept data sample to increase a frequency sweep speed; and a control unit for controlling the digital sweep part according to various items input, set, and selected by the user to perform spectrum analysis and output a spectrum analysis result.

Spectrum analyzer and method of controlling the same

Provided is a channel simulator having a function of supporting a carrier aggregation and a carrier aggregation block used for the same to support a carrier aggregation function at a minimum path loss without reducing the number of valid connectable terminals. The channel simulator includes: a terminal interface block connected to each of at least four terminals through at least two transmission/reception ports; a carrier aggregation block including unit modules each including one RF coupler and one RF switch, and interposed between the terminal interface block and the terminal to support the carrier aggregation for one to four component carriers; and a management server. The carrier aggregation block includes a front-end carrier aggregation unit and a rear-end carrier aggregation unit.

Channel simulator having function of supporting carrier aggregation and carrier aggregation block used for the same

Provided is a control method for a channel simulator, capable of expanding a processable dynamic range of an uplink signal receiving unit while adopting an A/D converter (ADC) having low resolution by adjusting an attenuation amount of the uplink signal receiving unit in a large-capacity channel simulator having P base stations and Q terminal interfaces. In a control method for a channel simulator that includes P base station interface cards (BS I/F cards) (P&#x3e;2; P is an integer), a link processor block, and Q user equipment interface cards (UE I/F cards) (Q&#x3e;2; Q is an integer) to form channels with respect to all paths between P base stations and Q terminals, the control method for the channel simulator according to the present invention includes: (a) establishing a table representing an attenuation amount offset in an uplink signal receiving unit of the UE I/F card over a path loss based on log data with respect to terminal transmission power over the path loss for eliminating change of the path loss exerting an influence upon the terminal transmission power; (b) searching for a specified path loss value from the table established in step (a) to determine an attenuation amount corresponding to the specified path loss value when a path loss value with respect to an uplink signal processing process is specified; and (c) adjusting an attenuation amount in the uplink signal receiving unit of the UE I/F card based on the attenuation amount determined in step (b).

Channel simulator using path loss of terminal transmit power to establish attenuation amount in uplink signal to base station

Provided is a method of processing a Wideband Code Division Multiple Access (WCDMA) signal timing offset for a signal analyzer. The method includes estimating an integer multiple timing offset of WCDMA baseband sample data corresponding to an amount of at least one frame; generating a frequency domain signal which is time delayed corresponding to a fractional timing offset estimation resolution after generating the frequency domain signal by performing a Fast Fourier Transform (FFT) calculation on an already-known reference signal; converting each time-delayed frequency domain signal into a time domain signal by performing an Inverse Fast Fourier Transform (IFFT) calculation on each time-delayed frequency domain signal and calculating a correlation between an input signal from a position of the integer multiple timing offset and the time domain signal; and estimating a delay time leading to a maximum correlation as a fractional timing offset.

Method of processing WCDMA signal timing offset for signal analyzing equipment

A calibration method for a channel simulator is applied to a large-capacity channel simulator having the interfaces of P base stations and Q terminals so that path loss calibration for P&#xd7;Q paths is more rapidly and easily performed.

Calibration method for channel simulator

Provided is a method of blindly estimating WCDMA OVSF of a signal analyzer, which includes: (a) setting SF to 512 and an index thereof to 0; (b) calculating a power average value of a symbol obtained by despreading descrambled data with an OVSF code set by increasing the index from '0' by '1'; (c) determining an OVSF code by which the power average value is equal to or greater than a power reference value as a used OVSF code candidate and determining an OVSF code by which the power average value is less than the power reference value as an unused OVSF code; (d) comparing a zero crossing rate of a symbol with a reference value to determine whether the OVSF code candidate is the used OVSF code; and (e) repeating (b) to (d) while reducing the SF half by half until the SF is equal to 4.

Method of blindly estimating WCDMA OVSF code for signal analyzer

An apparatus and method for detecting a cable fault which simultaneously apply a plurality of measurement frequencies mutually orthogonal to a cable and estimate reflection coefficients at the measurement frequencies using filters for filtering only the respective measurement frequencies to reduce a time taken to detect a cable fault.

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Suwon-si, South Korea

Kyoung Hwan Ju