tical modulated waveform (the error vector). A square root of the mean error vector power to the mean reference signal power ratio expressed as a % defines the EVM. One time slot corresponds to the measurement in- terval of one power control group. The EVM is less or equal to 17.5% for the UE output power parameter (-20 dBm) operating at normal conditions in steps of 1 dB. The code domain error results from projecting the error vector power onto the code domain at the maximum spreading factor. We define the error vector for each power code as the ratio to the mean power of the reference waveform expressed in dB, and the peak code domain error as the maximum value for the code domain error. The meas- urement interval is one power control group (time slot). The requirement for the peak code domain error applies only to multi-code transmission, and it shall not exceed The UMTS Network and Radio Access Technology -15 dB at a spreading factor of 4 for the UE output power parameter having a value (>-20 dBm) and operating at normal conditions [1]. 5.3.6.5.2 Inter-modulation By transmit Inter-modulation (IM) performance we meant the measure of transmitter capability to inhibit signal generation in its non-linear elements in the presence of wanted signal and an interfering signal arriving to the transmitter via the antenna. For example, user equipment(s) transmitting in close vicinity of each other can produce inter-modulation products, which can fall into the UE, or BS receive band as an un- wanted interfering signal. We define UE inter-modulation attenuation as the output power ratio of wanted signal to the output power of inter-modulation product when an interfering CW signal adds itself at a level below a wanted signal. Both the wanted signal power and the IM prod- uct power measurements use a RRC filter response with roll-off a = 0.22 and a band- width equal to the chip rate. Table 5.16 illustrates IM requirement when transmitting with 5 MHz carrier spacing. Table 5.16 Transmit Inter-modulation Interference signal fr