X Wireless V50LTE 4G Smart Phone User Manual 7 Tune procedure 1 19 OKx

Xwireless LLC 4G Smart Phone 7 Tune procedure 1 19 OKx

Contents

User Manual

Tune-Up Procedure 1. Purpose This panel gives the possibility to manage the mobile in the transmit mode. This window includes both: - All the parameters (frequency band, RF channel, RF level to get the desire antenna output power…) The user needs to make the mobile transmitting, - All the parameters needed to define a transmit burst, - All the compensation table to be ableto align the mobile in production. This Tx_commands user guide is describing: - The characteristics of the transmit burst, - All the parameters used in the transmit mode, - The operating mode to make the mobile transmitting 2. General description 2.1. Characteristics of the transmit burst The power levels and the shape of a transmit burst are controlled bythe power amplifier controller integrated in the MT6737 The burst is generated by a 10-bit DAC as shown below: The ramping shapes referenced with the rising edge of Tx-ON (from the Baseband). There are two types of parameters define the transmit burst: the first one define the shapes of the burst, and the second one define the temporal position of the burst. The rising and the falling edge of the transmit burst are determined by a set of 32 DAC code values n = 0 … 31. Tru = TxTRUDefault + △TRU_P + △TRU_T Trd = TxTRD_NBDefault + △TRD_P (for a normal burst). Trd = TxTRD_ABDefault + △TRD_P (for an access burst). 2.2. GPRS Data Transfer GSM mobile phones use a Time Division Multiple Access (TDMA) scheme to transmit data. The
TDMA format contains eight time slots. The handset power amplifier typically transmits in four of these up time slots. To prevent interference between cell phones, the time mask profile as specified is very restricted. To meet the GSM time mask, the output power of the PA needs to ramp up and down very quickly while staying within the time mask and not generating extraneous frequency bursts due to too abrupt ramp profiles. As described before, the Vramp input value sets the RF output power. By applying a certain ramp profile to the Vramp pin, the power level (Pout) of the PA is set to obtain the required time mask. A time mask of the PA’s output power is displayed. The time mask meets the limits (displayed by green lines) over a wide range of temperature, voltage and load variations. 3. Parameters F (n) are values coming from the DAC to shape the transmit burst. Some F(n) values have a corresponding Parameter used in the TAT to align the mobiles. Parameter used in TAT = [F (n)]. 3.1. Parameters used to shape the burst - H0 = [F (1)] controls the rate at which energy is given to the control loop at the beginning of the ramp. This energy is needed to bring the PA system control in a closed loop. This is the second code coming from the DAC. - PeakPow = [F (15)] corresponds to the peak power of the transmit burst. - H30 = [F (30)] corresponds to the last ramping coefficients used to shape the ramp. - MinPow = [F (31)] is a fixed parameter and corresponds to the Code Start of the AM7801 specification. It ensures a fast discharge of accumulated energy during the open loop mode in the summing node. 3.2. Parameters used to define the temporal position of the burst 3.2.1 Optimum position of the burst This parameter is TRU (or △TRU_P) on the panel, in the Optimal Burst. This is the burst starting time correction, which is optimised for each power control level. (Note that _P means that the parameter is a power compensation parameter).
3.2.2 Optimum length of the burst This parameter is TRD (or △TRD_P) on the panel, in the Optimal Burst. This is the burst length compensation, which is optimized for each power control level. (Note that _P means that the parameter is a power compensation parameter). 4. Operating mode 4.1. How to transmit a Tch burst (Random data), in PCS1900 mode, at power control level max: PCS 1900: Connect the mobile with special software, Configuration of the common parameters: - Band: PCS1900, - Channel: 661, - RF level: 0, - Burst select: Mode Tch Random Press STAR command to start continuous TX, you can check the burst with CMU200 or Agilent 8960; it must fit the curve below. 4.2. 4.2 How to stop Tx measurements: Press STOP command to stop the TX. 4.3. How to transmit a burst after modifying parameters Please note that each time a parameter (such as parameter used to shape the burst) is changed, then the user have to: download to flash to validate the parameter modification. If the command is not performed, the old parameters are taken into account. 5. Purpose This panel gives the description of the Frequency plan. This window includes both: - Automatic frequency control (AFC), - Static frequency error and range,
- Dynamic frequency error and range 6. Automatic frequency control Before a handset is allowed to transmit any signals, it needs to first receive the FSB signal from the base station, demodulate and decode it using its own local oscillator, map it to the constellation plane, calculate the frequency offset, and adjust the local oscillator accordingly, until 0.1ppm of frequency accuracy is achieved. This frequency correction loop is called the automatic frequency control (AFC) loop in GSM standard. The process as below: 7. Static frequency error and range ● Factors of static frequency error: Manufacturing frequency tolerance in crystal at room
temperature, aging, ● Static frequency error is compensated for using 6bits programming capacitor array(CAP ID). ● The static frequency range of capacitor array ( CAP ID=0 to63) must larger than 34ppm( +-17ppm). ● The static range depends on crystal‘s TS and CL ● The capacitor array calibration is done in production testing by setting the AFC DACto mid-scale(4196) and adjusting CAP ID to the setting that give closest to 0 ppm error(finish by test software). This CAP ID value is then stored 8. FDD TPC level setting The LTE TPC profile can be divided into two parts. The first part is PA control settings which are used to config the 8-level parameters and composed of PA mode, PRF (Upper limit of this level), PA Gain, DC2CDC level, Vbias DAC, Vm1, Vm2 and hysteresis (Start1/End1:high/middle intersection, Start2/End2: middle/Low intersection). The second part is TX compensation settings which are used to cogfig the compensation values including coupler loss for 3 PA modes, compensation by temperature foe 3 PA modes, subband compensation, PA compensation, and Power Detector (coupler loss) subband compensation. User can unload or download these relevant values by sub-band from or to flash. User can load or save these values form or files in PC, too. The hysteresis zone are used to decrease the LNA mode switch frequency as shown in the following figure. LTE Hysteresis TX Power form high to low: When pout ≥Start1 (12dBm), PA work at high gain mode; When pout ＜Start1 (12dBm), PA work at middle gain mode; TX Power form low to high:
When pout ≥End1 (12dBm), PA work at high gain mode; When pout ＜End1 (12dBm), PA work at middle gain mode 9. Maximum Target Output Power MaxTargetPower(dBm)Mode/BandChannelLowMiddleHighGSM85032.532.532.5GPRS1TXSlot32.532.532.5GPRS2TXSlot31.931.931.9GPRS3TXSlot30.330.330.3GPRS4TXSlot29.129.129.1EDGE1TXSlot25.625.625.6EDGE2TXSlot24.624.624.6EDGE3TXSlot22.722.722.7EDGE4TXSlot21.621.621.6PCS190028.928.928.9GPRS1TXSlot28.728.728.7GPRS2TXSlot282828GPRS3TXSlot26.526.526.5GPRS4TXSlot25.525.525.5EDGE1TXSlot25.225.225.2EDGE2TXSlot24.624.624.6EDGE3TXSlot22.522.522.5EDGE4TXSlot21.521.521.5WCDMABand221.821.821.8HSDPA21.821.821.8HSUPA20.920.920.9DC‐HSDPA20.720.720.7HSPA+20.420.420.4WCDMABand521.921.921.9HSDPA21.121.121.1HSUPA212121DC‐HSDPA20.720.720.7HSPA+20.520.520.5LTEBand222.922.922.9LTEBand421.921.921.9LTEBand1223.023.023.0WLAN(802.11b)9.09.09.0WLAN(802.11g)9.09.09.0WLAN(802.11nHT20)9.09.09.0WLAN(802.11nHT40)9.09.09.0BluetoothBDR/EDR4.04.04.0BluetoothLE000

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