Cross modulation distortion in CDMA receivers

Aparin, V.; Butler, B. J.; Draxler, P.

doi:10.1109/mwsym.2000.862366

Cited by 21 publications

(2 citation statements)

References 4 publications

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“…Peak Power is the value, such that the instantaneous power exceeds it only with 0.11% probability. I Lna was programmed im low gain mode so that the distortion due to self mixing of the Tx leakage (due to 2nd order non-linearity of the Mixer) is insignificant compared to cross modulation Also the power of the WCDMA modulated blocker was kept more than 10 dB below the power of the TX leakage so that the cross modulation power is much more significant compared to the spectral leakage of the modulated blocker (due to third order non-liearity) 2. For the WCDMA modulated blocker scenanro the blocker is located at a 5 MHz offset from the desired channel In case of a CW blocker the CW blocker is located at an offset of 2.7 MHz V.…”

Section: Measurement Resultsmentioning

confidence: 99%

Analysis and Measurement of Cross Modulation Distortion in WCDMA Receivers

Mohammed

Yanduru

2006

APCCAS 2006 - 2006 IEEE Asia Pacific Conference on Circuits and Systems

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Due to non linearity of the front end RF components in a WCDMA Receiver, the modulation of the leaked transmitter (TX) signal can get transferred to a blocker, resulting in cross-modulation. If the blocker is close to the desired channel, the cross-modulation spectrum would contaminate the desired channel. Previous published work has analyzed cross-modulation but only for the cases when the leaked TX signal has one or infinite number of physical channels. In this paper, we perform more exhaustive analysis, and derive a closed form expression for the distortion as a function of a generic (N) number of channels in the leaked TX signal. This analysis is also supported with measurements on a WCDMA chip.

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Section: Measurement Resultsmentioning

confidence: 99%

Analysis and Measurement of Cross Modulation Distortion in WCDMA Receivers

Mohammed

Yanduru

2006

APCCAS 2006 - 2006 IEEE Asia Pacific Conference on Circuits and Systems

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“…The work proposed in this paper covers complementary aspects as it focuses on a measurement technique and setup. Crossmodulation characterization and its impact on Adjacent Channel Power Ratio (ACPR) or Adjacent Channel Leakage ratio (ACLR) have been performed using spectrum analyzer techniques [6], [7]. In this paper a time-domain measurement approach based on wideband harmonic sub-sampling principle is proposed.…”

Section: Introductionmentioning

confidence: 99%

Broadband time-domain measurement system applied to the characterization of cross-modulation in nonlinear microwave devices

Abouchahine

Saleh

Neveux

et al. 2009

2009 IEEE MTT-S International Microwave Symposium Digest

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Transmitter System Analysis and Design

RF System Design of Transceivers for Wireless Communications

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Chapter 5 kHz is the proper bandwidth for its transmission power measurement in the frequency domain. The main lobes of CDMA and GSM signal spectra are given in Section 2. 4.4.3, Fig. 2.35, and Section 2.4.4.2, Fig. 2.33.The maximum output power of a mobile transmitter will affect the overall wireless system performance, such as cell size and capacity, and the mobile station power consumption as well. It is well defined in all the wireless communication systems and is generally classified based on power levels and operating frequency bands. For the GSM system, in the 900 MHz band, the nominal maximum output powers of power class 2, 3, 4, and 5 are 39, 37, 33, and 29 dBm, respectively, but in the 1800 MHz band, the nominal maximum output powers of power class 1,2, and 3, are respectively 30, 24, and 36 dBm [2]. For the WCDMA system, in the UMT (2.0 GHz) frequency band, the nominal maximum output powers of power class 1 to 4 are 33, 27, 24 and 21 dBm, respectively [I]. In the CDMA system, the maximum output power is defined slightly different from the GSM and the WCDMA systems, and there lower and upper limits of the maximum output power are used instead of the nominal value [3]. These limits for the 800 MHz Cellular band and 1900 MHz PCS band CDMA mobile transmitters are 23 and 30 dBm for their popularly used power classes 3 and 2, respectively. However, the most commonly used maximum transmission powers in the practical mobile transmitter design of various wireless communication systems are presented in Section 3.1.3.2, Table 3.2. In reality, the maximum output power of a mobile transmitter might be also limited by compromising transmission power within the tolerance range for a better transmitter linearity and/or for meeting requirements of the spec@ absorption rate (SAR) * [4]. Modulation Accuracy Error Vector Magnitude E VM and Waveform Quality Factor pModulation accuracy is one of the key parameters for the wireless communication transmitters. The modulation accuracy is represented by error vector of modulation, which is the difference between the actual symbol location and the theoretical symbol location on the modulation vector constellation diagram. This may be better explained through an example. In the CDMA reverse link, offset QPSK (OQPSK) modulation is * SAR is used to measure the amount of RF power that a mobile station through its antenna delivers to the human body.

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Cross modulation distortion in CDMA receivers

Cited by 21 publications

References 4 publications

Analysis and Measurement of Cross Modulation Distortion in WCDMA Receivers

Analysis and Measurement of Cross Modulation Distortion in WCDMA Receivers

Broadband time-domain measurement system applied to the characterization of cross-modulation in nonlinear microwave devices

Transmitter System Analysis and Design

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