1.2.4.1 Analyses of interferences towards DCS from WCDMA

[adewijaya]

Dear all Member, i will asking some question in here

1. Analyses of in-band spurious radiation interferences of the receiver?
2. Analyses of inter-modulation interferences?
3. Analyses of barrage jamming?

[Irna]

Dear all Member, i will asking some question in here

1. Analyses of in-band spurious radiation interferences of the receiver?
2. Analyses of inter-modulation interferences?
3. Analyses of barrage jamming?

Answer
1. WCDMA influences in-band spurious radiation of DCS1800 receiver. That’s because out-of-band spurious radiation of WCDMA transmitter influences in-band spurious radiation of DCS1800 receiver at the band of 1710--1785MHz.
Requirements for background noise of DCS receiver: The noise figure of DCS receiver is 4dB, and the corresponding background noise is -174+10Log（2×10E5）+4dB＝-117dBm. If the influence of spurious radiation of WCDMA over DCS sensitivity is expected to be reduced to a certain degree (e.g., the degradation is no more than 0.1dB), the signal power of WCDMA spurious radiation received by DCS antenna interface should be -16dB lower than the equivalent background noise of DCS1800 reception channel

2. Influence over DCS1800 inter-modulation from WCDMA includes three aspects: inter-modulation interference with DCS1800 transmission band from WCDMA spurious radiation, inter-modulation interference with DCS1800 reception band from WCDMA transmission power, inter-modulation interference with DCS1800 reception band from WCDMA spurious radiation

3. The DCS1800 receiver jamming caused by WCDMA includes the following two aspects: in-band and out-of-band jamming of DCS1800 receiver caused by WCDMA spurious radiation, and out-of-band jamming of DCS1800 receiver caused by WCDMA transmission signals

[adewijaya]

any formula for this answer will be very appreciated