Agilent Technologies 8935 series e6380a manual Code Domain Measurements IS-2000

CDMA Measurements - Screens and Control Fields

CDMA Measurements

Figure 5-8 Code Domain Timing and Phase

Tim e

1 8 9

32

40

W alsh Code

Phase

1	9	32		W alsh Code
8			40

Screens on which this measurement is displayed

• CODE DOM (Code Domain Analyzer, IS-95 only)

Code Domain Measurements – IS-2000

If you have selected IS-2000 in the INSTRUMENT CONFIGURE screen, the Code Domain screen will appear as described in this section, with a default Walsh Code ordering following the Bit Reverse paradigm, with 128 channels.

If you wish to make use of the traditional Walsh ordering - Hadamard - as described by the IS-95 standard, see “Meas Order” on page 163.

Bit Reverse, or Walsh index ordering display mode for Code Domain Power is a newly defined order for code domain measurements supporting IS-2000 CDMA. This coding sequence differs from IS-95’s, or Hadamard ordering as shown in Figure 5-10.

Advantages of Using IS-2000

The CDMA standard, IS-2000, offers a number of enhancements to the IS-95 standard including the following:

•Reverse Link Pilot for Each Mobile – Allows base stations to perform synchronous detection during demodulation, resulting in a performance gain.

•True QSPK Modulation – Yields 2 bits per symbol, allowing twice the processing gain to be applied to both I and Q data. This, more efficient modulation also allows for stronger convolutional encoding.

•Continuous Reverse Link Waveform – Continuous (no pulse) reverse link provides less biomedical interference and better transmit power averaging.

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