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# Analysis of the link budget for a FM Analog telephone link

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The frequency band 870 - 890 MHz is used for analog (FM) cellular telephone systems. A base station transmits a signal with a power of 1 watt to an antenna with a gain of 10 dB. The signal is received by a cell phone 2 km away with an antenna gain of 0 dB.

a. For the path length of 2.0 km, calculate the free space path loss in dB at a frequency of 880 MHz, assuming line of sight (LOS) conditions between the base station and the cell phone.

b. Calculate the power at the input to the cell phone receiver, in dBW. Set your answer out as a link budget and include 3 dB miscellaneous losses.

c. The cell phone receiver has a system noise temperature of 450 K and a noise bandwidth of 30 kHz. Calculate the noise power and carrier to noise ratio (CNR) in the receiver.

d. The threshold carrier to noise ratio (CNR) for successful reception of the FM signal is 20.0 dB. What is the link margin under line of sight (LOS) conditions? Under what conditions might the margin be reduced to 0 dB, or the CNR at the receiver fall below 20 dB?

#### Solution Preview

(a) Path loss in this case is just the free space loss FSL.

The free space loss is given in terms of the operating wavelength of the transmission (Lamda) and the distance of the transmission (r) by (1), where &#955; and r are measured in m.

FSL = 20*log10{4pi*r/Lamda} (1)

Putting in values:

r = 2 km = 2 x 10^3 m

Lamda = c/f where c is the speed of light, c = 3 x 10^8 m/s, f is the frequency f = 880 MHz

Lamda = (3 x 10^8)/(880 x 10^6) = 0.34 m

Therefore using (1) the free space loss is determined as

FSL = 20*log10{(4&#1087; x 2 x 10^3)/0.34} = 97.4 dB

(b) Power received (Pr) at input to the cell phone can be deduced by performing the power link budget and thus the power received is given by (2) as the dB sum of the power transmitted{Pt + Gt}, the gain of the receive site antenna Gr minus the total path loss LP. Note that Pt is the actual dB power transmitted and Gt is the gain of the transmit ...

#### Solution Summary

An Analog (FM) cellular telephone system is analysed to find the Free space path loss, Noise power in the receiver and threshld link CNR. The link margin is also determined for LOS conditions and factors that may reduce this margin to below 0 dB explored

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## Question about Comparing FMC Green River and FMC Aberdeen

An organization is a consciously coordinated social unit, composed of several people whose main focus is to achieve a common goal or set of goals. A successful organization understands the cultural differences in various divisions or branches. It uses culture and group dynamics to overcome management challenges, implement strategic initiatives, and develop business opportunities. Organizations with an exceptional "company" culture are usually run by leaders who understand and practice effective cultural leadership principles. A culture or sub-culture that works effectively in one part of an organization may not work well in another. Those who have made it to the top have done so by building a high performance workplace around the corporate culture.

As you prepare for each assignment your focus should be on developing a basic understanding of leadership, motivation, job satisfaction, etc., and how the corporate culture is what makes something work in one part of an organization, but not another.

Assignment:

Using the appropriate organizational analysis format begin your analysis by focusing on the following areas of interest. During the next five weeks, you will be using this format, and the step-by-step process to look at various areas of interest, culminating in the preparation of a formal proposal for the Plant Manager. So, it is important that you use a consistent format to take "notes" along the way (which will be submitted to your instructor). Start now by developing a paper (your "notes") which addresses:

The Management of Ability

Organizational Commitment

Job Satisfaction

Organizational Ethics

While engaging the step-by-step analytical process keep in mind the differences that exist between FMC Green River and FMC Aberdeen. For example, think about the management of ability. State the what the corporate culture and work environment is like at Aberdeen, then at Green River. How does each operation make the best use of its employees' skill sets? Based on the corporate culture, identify an alternate method for them to leverage their employees abilities. Will the methodology you select for Aberdeen work at Green River? How will you implement your recommendation at each facility? Include your thoughts on these issues with your notes; you can either incorporate them into the "areas of interest" or add them as side notes.

Can you provide with an example to use to build my assignment? Any help will be much appreciated. Provide references for external sources. Thank you.

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