Performance Analysis of Fully Joint Diversity Combining, Adaptive Modulation, and Power Control Schemes
Adaptive modulation and diversity combining represent very important adaptive solutions for future generations of wireless communication systems. Indeed, to improve the performance and the efficiency of these systems, these two techniques recently have been used jointly in new schemes named joint ad...
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| Format: | Others |
| Language: | en_US |
| Published: |
2010
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| Online Access: | http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7005 http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7005 |
| Summary: | Adaptive modulation and diversity combining represent very important adaptive
solutions for future generations of wireless communication systems. Indeed, to
improve the performance and the efficiency of these systems, these two techniques
recently have been used jointly in new schemes named joint adaptive modulation
and diversity combining (JAMDC) schemes. Considering the problem of finding lowcomplexity,
bandwidth-efficient, and processing-power efficient transmission schemes
for a downlink scenario and capitalizing on some of these recently proposed JAMDC
schemes, we propose and analyze three fully joint adaptive modulation, diversity
combining, and power control (FJAMDC) schemes. More specifically, the modulation
constellation size, the number of combined diversity paths, and the needed power
level are determined jointly to achieve the highest spectral efficiency with the lowest
possible combining complexity, given the fading channel conditions and the required
bit error rate (BER) performance. The performance of these three FJAMDC schemes
is analyzed in terms of their spectral efficiency, processing power consumption, and
error-rate performance. Selected numerical examples show that these schemes considerably
increase the spectral efficiency of the existing JAMDC schemes with a slight increase in the average number of combined paths for the low signal to noise ratio
range while maintaining compliance with the BER performance and a low radiated
power resulting in a substantial decrease in interference to co-existing systems/users. |
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