程序代写案例-ELEC6217

School of Electronics and
Computer Science
Coursework (2 of 2)
Instructions
Module: ELEC6217 Title: Wireless Transceiver
Design an
d Implementation
Lecturer: L.-L. Yang/M. EI-
Hajjar
Deadline: 14/Jan/2022 Feedback: 11/Feb/2022 Weighting: 70%
Instructions
Transceiver System Design
Design a transmitter and receiver to major component level (see note below) to operate to the following
specification:
System
1.1. 2.450GHz carrier frequency
1.2. Modulation type at R b/s specified in the table below
1.3. Half-duplex operation (transmit or receive, one at a time). Minimum transmission length in any direction
is 105 symbols.
1.4. Channel Spacing: 2.5R Hz
1.5. The design should minimise component complexity and cost for a medium-size production volume of
100k units. (i.e. do not specify general purpose research hardware or the design of custom chipsets)

Transmitter
2.1. Transmit filtering: 50% rolloff, root raised cosine, implemented in DSP
2.2. Transmit power: W dBm into 50 ohm antenna load (Compliance matrix entry required, See Section 6)
2.3. Harmonics of the carrier frequency shall be less than –50dBc (relative to the fundamental frequency
transmission power W) (Compliance matrix entry required)

Receiver
3.1. Bit Error Rate (BER) less than 10-3 BER with receiver power input of P dBm. Channel type: Non-
dispersive with Additive White Gaussian Noise (AWGN). Simulation performance to be demonstrated
and shown in a graph over a BER range from 10-4 to 10-1. (Compliance matrix entry required).
3.2. Correct demodulation at receiver power up to a maximum signal input power of -50dBm (demodulation
must be possible at this input power level). (Receiver linearity requirement) (Compliance matrix entry
required)

3.3. Receiver structure: Superheterodyne (final mixing to quadrature IF is permissible) (Compliance matrix
entry required)
3.4. Adjacent channel rejection:
3.4.1 1st channel:30dB min (Compliance matrix entry required)
3.4.2 2nd channel:50dB min (Compliance matrix entry required)
3.5. Image channel rejection: 50dB min (Compliance matrix entry required)
3.6. Operation to specification paragraph 3.1 with a maximum carrier frequency error of 1kHz (this specifies
the offset in frequency between Tx and Rx. Simulated performance to be tested at offsets of –999Hz, 0Hz,
+999Hz (Note that, for R=20kb/s, the test offsets shall be reduced to +99Hz and -99Hz) (Compliance
matrix entry required)

3.7. Receive data filtering, detection and bit timing synchronisation: to be designed for implementation in
DSP. DSP processing power (number of million instructions per second (MIPs)) must be justified.
(Compliance matrix entry required)

3.8 Bit timing synchronisation, test results to demonstrate operation of synchronisation. Time to lock to
sampling point at P dBm input signal: no more than 1,000 symbols. (Compliance matrix entry
required)


Team variations:
Team A B C D E F G H I
R
20k 2M 20M 20k 2M 20M 200k 20M 20M
W 10 20 20 10 20 20 20 10 20
P -115 -95 -85 -107 -95 -85 -100 -85 -85
Modulation Pi/4DQPSK DQPSK Pi/4DQPSK 8DPSK Pi/4DQPSK DQPSK 8PSK Pi/4DQPSK DQPSK

Design process:
Carry out a design of the major components to meet the specification (i.e. mixers, filters, amplifier blocks). The
choice of each component block should be justified against the specification. Components should be chosen from
up-to-date component supplier information.

The DSP sections of the design should be designed as a Matlab simulation using a complex baseband
representation (i.e. 0Hz carrier frequency).

The individual report should be no more than 30 pages long, including both transceiver design and OFDM &
fOFDM parts, and contain a design discussion, the design, and simulation results.

Note: you do not need to design secondary items (e.g. power supplies, displays, decoupling components, phase
locked loop details)

Report content checklist:
Please check that you have correct answers for the following checklist questions:

1. Is the target Eb/No for your modulation scheme correct and understood?
2. Have you checked the calculation of the target Noise Figure?
3. Have you checked the derivation of the calculated system Noise Figure?
4. Does the radio architecture achieve what is required (single RF connection, meets the requirement
specification)? It should contain the designs for the parts below:







5. Do you have a diagram of the system architecture with clearly labeled gain and NF contributions?
6. Are all amplifiers clear of saturation under maximum signal power input conditions (-50dBm) unless
otherwise intended?
7. Do you understand the design of the receiver architecture, even if you were not part of the team that
worked on it?
Quadrature
Downconverter
LO = IF

Symbol Sync and
detection
One or two superhet
stages
Transmitter
B
P
F
RF
Switch
RF Port
8. Do you understand the operation of the software simulation, even if you were not part of the team that
worked on it?
9. Have you checked through that each item of the specification is addressed in your design?


Report Structure:
Apart from the personal reflection, write the report as a technical report in the passive style (e.g.
“the amplifier was selected for a noise figure of less than …” rather than I selected the amplifier
for a noise figure …”)
Please structure your report with the following chapter headings:
1. Introduction (include a list of your team members and the contributions – including yours
– to the assignment)
2. Specification adjusted to your team’s requirement, including NF target.
3. Radio design
3.1. Receiver
3.2. Transmitter
3.3. DSP Hardware (including A/D and D/A)
4. Signal Processing
4.1. Modulation and demodulation
4.2. Sampling
4.3. Bit timing synchronization
4.4. OFDM and filtered-OFDM
5. Simulation Results
5.1. BER vs Eb/No
5.1.1. 0 Hz offset
5.1.2. +Hz offset
5.1.3. -Hz offset
5.2. Results of OFDM
6. Compliance matrix.
6.1. Compliance Table
This should be a table of the specification points above, a column including the spec
requirement, plus a column noting your response to each point (e.g. reference to a section
number where it is discussed). Also state whether the design is compliant with the
specification point, e.g. image rejection 55dB see section 3.1.5). Do not underestimate
the time to do this – it should be done as a team at the same time as you perform the
design.
For example:
Spec.
Para.
Exceeds/Fully/ Partial
/Not done
Requirement
Value
Achieved
Value
See report
section
3.5 Exceeds 50dB 55dB 3.1.5

7. Personal reflection. Make this brief (less than half a page), cover what you learnt and
anything you want to say about the teamwork, assignment, good and bad
8. Conclusion
9. Acknowledgements (to anyone you want to thank for assistance in completing the
assignment)
10. References
Process:
1. Choose one of the team members to act as team leader who is responsible for ensuring that the design is
organised and nothing is left out. The team leader will organise to report the progress and explain the
design issues during the design process.
2. Review your specification and ensure that everyone understands what is meant by each point. Make up a
compliance matrix (see Report Structure above) to use as a guide to fill in as the design progresses.
3. Start on the superhet design first, since it is independent from the baseband signal processing. First of
all, find suitable filters that will meet your image and adjacent channel rejection and at the same time let
the signal through. Start by choosing an IF filter that will meet the specification and then work toward
the front end.
Possible vendors are: TDK, Vectron, Murata, NJR, TOKO, Tai-SAW, Sawtek, Golledge. If the filters
specs do not allow the design to meet the specification, you may need to think of a double superhet design
or a high sampling frequency for the DSP and do the adjacent channel filtering in the DSP.
4. Please note that, as in assignment 1, the matched filtering is performed in the DSP operation. Any filtering
in the receiver before this point must have a wider frequency response so that the complete cascade of
receive filters is dominated by the matched filter.
5. In parallel with the filter search, someone can do a noise figure calculation and search out a suitable low-
noise amplifier.
6. Find a suitable A/D converter and its input signal requirements
7. Then specify suitable amplifiers and mixers and oscillators to complete the superhet design. You need
to calculate the effect of the circuit noise, and look at the effect of handling the specified large signals
(amplifiers overloading, both transmitter and receiver).
8. The DSP design is in two parts, the hardware required for it (programmable processor or purpose-
bought hardware), and the simulation code. Assign members of the group to these parts but remember
that the hardware has to do what the simulation requires. Hint: by far the most intensive signal processing
task is the filter. Note – the most of the baseband simulation work can be done in parallel with the
receiver architecture design, so start early on it.


Design Targets:
(8 Nov) *Identify the S/N (Eb/No) for the BER with your modulation scheme and go on to complete Noise Figure
calculations, calculating a maximum allowable system noise figure. Have at least a candidate filter for
the (final) IF filter.
(15 Nov) *Finish your search for suitable filters and propose a superhet design
(22 Nov) *Identify and propose the complete structure of the transmitter and receiver
*Identify individual amplifiers and mixers
(29 Nov) *Identify the DSP requirements (in terms of MACS - multiplier/accumulations per second) for the
transmit/receive functions (note that transmitter and receiver are not operating at the same time, and that
the dominating processing requirement will be the matched filter. Propose a suitable DSP implementation
(e.g. Programmable DSP or ‘hard wired’ such as in a FPGA – field programmable gate array).
*Propose the detailed changes to the Assignment 1 Matlab code to perform the demodulation required
(pay particular attention to the frequency offset)

(13 Dec) *Present simulations of demodulation performance including behaviour with frequency offset
https://secure.ecs.soton.ac.uk/notes/elec6217/

Submission
Please hand in via the C_BASS system (electronic submission of the report file).
The individual report should be not more than 30 pages long (shorter if you can) and
contain a design discussion, the design, and simulation results.
Relevant Learning Outcomes (LOs)
1. Be able to design a transceiver system architecture against a comprehensive performance
specification.
2. Design and present a simulation of a communication system using computational baseband
models.
Marking Scheme
Criterion Description LOs Total
Transceiver Design Technical validity of transceiver design 1 30/100
Transceiver Report Description of superhet transceiver design 1 40/100
Simulation Design Technical validity of baseband processing 2 30/100




Marking Matrix

Report section Criteria for full marks Usual
Marks
Distribution
Introduction Name on report. Clear description of the task,
description of team member tasks, including your own
contribution
5/100
Specification Clear statement of your team specification. Clear and
correct derivation of the NF target figure and reference
to any sources you used for the target Eb/No. Correct
calculation of signal bandwidth and its implication for
filter choice.
10/100
Radio design Clear and correct description of the reasons for the
choices of frequency plan. A well-labelled and clear
diagram showing key details for all blocks (NF, gain,
freq, insertion loss, filter rejection achieved, etc.). Clear
demonstration that adjacent channel filtering and all
image channel rejection requirements are met. Analysis
of achieved NF is correct and within specification, with
APPCAD table of NF analysis. Clear and correct
analysis of overall gain for Tx and Rx chains, including
maximum input signal analysis and treatment of any
amplifiers in saturation under this condition. Clear and
correct transmit harmonic level analysis. Correct
analysis of ADC and DAC choice. Correct analysis of
DSP choice. Listing of all part numbers used, their key
performance aspects for why they were chosen.
30/100
Signal Processing Clear description of the changes to Assignment 1
Matlab code to implement the symbol encoding
and decoding. Clear description of the differential
15/100
demodulation routine. Clear description of the bit
timing recovery routine.
Clear description OFDM and filtered-OFDM.

Simulation results Presentation of performance curves of BER vs Eb/No for
zero, positive and negative frequency offsets, all on the
same graph. Include curves for beyond-spec frequency
offsets to show the degradation in performance. Clear
statement of the averaging period used for bit timing
recovery. Comments on any unexpected deviations from
expected performance.
Presentation of simulation results of OFDM and f-
OFDM systems.
15/100
Compliance Matrix Clear statement of compliance/non-compliance and
references to report paragraphs. No instances of non-
compliance being passed as compliance.
10/100
Personal reflection A thoughtful reflection covering, at least, lessons learnt,
team work experience.
5/100
Conclusion A concise description of the work and its results 5/100
References References supported principles/design/analysis/ are
listed and appropriately cited
5/100



Late submissions will be penalised at the current Department penalty. No work can be accepted after feedback has been given.
You should expect to spend up to 50 hours on this assignment. Please note the University regulations regarding academic integrity.


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