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| Content Provider | IET Digital Library |
|---|---|
| Author | Prakash, Shiva Loughlin, Ian V. Mc |
| Abstract | Rate-adaptive modulation and transmit antenna selection require channel knowledge at the transmitter, typically achieved using a feedback communications path from receiver to transmitter. Feedback delay in such systems causes outdated channel knowledge at the receiver and thus suboptimal switching decisions. This study evaluates the effect of degraded switching and proposes a channel prediction scheme to mitigate against delay-induced performance degradation, specifically when deployed in Rayleigh fading channels using maximum ratio combining at the receiver. Shannon capacity expressions are found and then closed form bit-error-rate and average spectral efficiency expressions derived – all derivations supporting arbitrary number of antennas at both receiver and transmitter. These expressions are developed to allow optimal switching boundaries to be determined for M-quadrature amplitude modulation rate adaptation under different degrees of channel prediction error, system arrangement and number of antennas. |
| Starting Page | 1852 |
| Ending Page | 1862 |
| Page Count | 11 |
| ISSN | 17518628 |
| Volume Number | 7 |
| e-ISSN | 17518636 |
| Issue Number | Issue 16, Nov (2013) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-com/7/16 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-com.2013.0096 |
| Journal | IET Communications |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | Adaptive Modulation Average Spectral Efficiency Expressions BER Channel Knowledge Channel Prediction Error Closed Form Bit-error-rate Delay-induced Performance Degradation Diversity Reception Error Statistics Feedback Communication Path Feedback Delay M-quadrature Amplitude Modulation Rate Adaptation Maximum Ratio Combining Modulation And Coding Method Performance Analysis QAM Quadrature Amplitude Modulation Radio Link And Equipment Rate-adaptive Modulation Rayleigh Channel Rayleigh Fading Channel Shannon Capacity Expressions Single Antenna Statistics Suboptimal Switching Decisions Transmit Antenna Selection Transmitting Antenna |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering Computer Science Applications |
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