Dear Bhuwam,

I suggest to you a links and attached files in topics.

- Having problems with wifi,bluetooth and gps in ... | Official ...

https://discussions.apple.com/thread/7509388?tstart=0

- What can interfere with GPS signal? - Laptop GPS World

www.laptopgpsworld.com › Hardware

- The Problem with Mobile Phones | Surveillance Self-Defense

https://ssd.eff.org/en/module/problem-mobile-phones

- How does WiFi improve the GPS location? - Quora

https://www.quora.com/How-does-WiFi-improve-the-...

- Is it possible to input a GPS signal from an external GPS Source? - em ...

https://em-trak.com/.../possible-input-gps-signal-exter...

- Weak signal acquisition enhancement in software GPS receivers – Pre ...

www.sciencedirect.com/science/.../S22108327140002...

 Best regards

Bluetooth signals varies around ISM band frequency which is 2.4 GHz in India. The mobile carrier frequency will be based around 900 MHz (GSM) or 1800 MHz (CDMA).

The interference can be strong if the Bluetooth frequency is a multiple of the mobile frequency. The chances are more for GSM band.

Dear Bhuwam,

GPS and blue tooth do not  interfere with any mobile band including 2G,3G and 4G as each technology has its own frequency bands:

Blue tooth: This is in the globally unlicensed (but not unregulated) Industrial, Scientific and Medical (ISM) 2.4 GHz short-range radio frequency band. Bluetooth uses a radio technology called frequency-hopping spread spectrum

GPS: In the case of the original GPS design, two frequencies are utilized; one at 1575.42 MHz (10.23 MHz × 154) called L1; and a second at 1227.60 MHz (10.23 MHz × 120), called L2. The C/A code is transmitted on the L1 frequency as a 1.023 MHz signal using a bi-phase shift keying (BPSK) modulation technique.

Mobile: Network Frequencies

EE 800MHz (4G) 1800MHz (2G & 4G) 2100MHz (3G) 2600MHz (4G)

O2 800MHz (4G) 900MHz (2G & 3G) 1800MHz (2G) 2100MHz (3G)

Vodafone 800MHz (4G) 900MHz (2G & 3G) 1800MHz (2G) 2100MHz (3G) 2600MHz (4G)

Three 800MHz (4G) 1800MHz (4G) 2100MHz (3G)

Best wishes

Hello Bhuwam

Cellular receivers incorporate "filters" as one of the first elements in their lineup.  A filter would generally be a bandpass filter, which will pass signals in the desired band and reject signals outside of the filter bandwidth. The GPS, Bluetooth, Cellular etc. systems are designed to not directly interfere with one another, in that they use specific non-overlapping operating bands. Some of the responses above detail those bands. 

As Prabir mentioned above, if one is not careful with the design of any of these radios, unintended noise can be generated which could appear in other user bands. That is why the regulatory agencies require products to be tested for undesired emissions. 

Regards

I have seen it the other way around, LTE bands 13 and 14 I believe (787 MHz) interfering strongly the GPS reception at 1575.42 MHz.

The 2nd harmonic of 787 MHz lies in the GPS frequency band. Even when the 2nd harmonic was weak, the GPS LNA would produce the 2nd harmonic when receiving the strong 787 MHz carrier. A good notch filter at the LNA's RF-input was necessary.

GPS signals are very weak and are easy to get interfered.

GPS interference on mobile signals is not present as far as I know.

regards, Bart

The networks are not transmitted at the same frequency, not even closer frequency, so no interference can occur

Hi all,

Thanks for your answers, but sometimes i observe the phenomenon when my cellular network is weak, and when i switch ON my B/T or GPS i can see the spike in the signal strength of cellular network, what is the probable cause for that.

Dear Dixit, what do you mean with spike in the signal strength of the cellular network?

Do mean you observe an increase of the signal strength indicator of the cellular network?

The interference source may be the local oscillators of the other wireless systems.

You have to investigate the configuration of the three co existing systems and see the internal source of interference. But, the most probable one is that of the of local oscillator signals as it is the strongest existing nearby the cellular receiver.

best wishes

Thanks for the answer Abdelhalim,

yes i observe the increase in the signal strength.