publication . Thesis

Rate and power adaption techniques for wireless communication systems

Ong, Lay Teen;
Open Access English
  • Country: United Kingdom
Abstract
Attaining the most spectrally efficient form of data transmission over a time- varying channel remains as fundamentally important target in wireless systems. Link adaptation (LA) is a promising approach to increase spectral efficiency. In general, the transmitter adjusts its parameter such as rate, power and coding in accordance with the channel state information (CSI) fed back from the receiver. Consequently, the accuracy of the CSI is prevalent in LA design. In this thesis, an investigation of the performance of a variable rate variable power (VRVP) multi-level quadrature amplitude modulation (MQAM) scheme is performed for a single antenna system. Then, a nove...
Subjects
arXiv: Computer Science::Information Theory
ACM Computing Classification System: Data_CODINGANDINFORMATIONTHEORY
free text keywords: QA
Related Organizations
61 references, page 1 of 5

2.1 F a d in g .........................................................................................................

2.2 Small Scale Fading and M ultipath E f f e c t ..........................................

2.3 M ultipath Time Delay Spread: Flat/Frequency Selective Fading . 2.3.1 F la t- F a d in g .................................................................................... 2.3.2 Frequency Selective F a d in g .........................................................

2.4 Doppler Spread: Fast/Slow Fading ....................................................

2.5 Summary ..................................................................................................

Link A d a p ta tio n T echniques under Perfect CSI K now led ge 16

3.1 In tro d u c tio n ............................................................................................... 16

3.2 Capacity of a Time-Varying C h a n n e l ................................................. 17 3.2.1 Optim al Rate and Power A d a p ta tio n ...................................... 17 3.2.2 Sub-Optimal Transm itter A d a p ta tio n s .................................. 19 3.2.3 Numerical Results ...................................................................... 21

3.3 VRVP-MQAM S y s t e m ........................................................................... 24

3.3.1 BER for M Q A M ..........................................................................

3.3.2 Rate and Power A d a p ta tio n s......................................................

3.3.3 Numerical Results .......................................................................

3.4.1 Problem F o rm a tio n .......................................................................

3.4.2 Numerical Results .......................................................................

4 P ilo t S ym b ol A ssisted M o d u la tio n B a sed C h an n el P red ictor 4.1 In tro d u c tio n ............................................................................................... 4.2 P S A M ......................................................................................................... 4.3 PS AM-Based Channel Predictionfor an LA S y s te m ........................ 4.3.1 Optimal-M AP Channel P r e d i c t o r ............................................ 4.4 Statistical Properties of the Predicted and the True Fading Amplitude .......................................................................................................... 4.4.1 The Ratio r = Q / Q ....................................................................... 4.4.2 Correlation C o e ffic ie n t................................................................ 4.4.3 Relationship between r and p .................................................. 4.4.4 Selection of (L , K 0) and its impact on p .................................. 4.5 S u m m a r y ..................................................................................................

61 references, page 1 of 5
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