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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Faedfar, Y. Salleh, M.F.M. |
| Copyright Year | 2012 |
| Description | Author affiliation: School of Electrical and Electronic Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia (Faedfar, Y.; Salleh, M.F.M.) |
| Abstract | The scalar Nt × Nr MIMO system can be designed as the Nt independent SISO transmitters, where Nt and Nr are the number of transmit and receive antennas, respectively. Each of the transmitters has an independent symbol mapper, which rotates the phase according to the phase of the channel from its antenna to the receiver reference antenna. Every symbol mapper assigns a maximum degree of freedom to the signal, which in turn requires the minimum feedback bits. The Nr received signals reform the same transmit constellation after applying the combining vector of the GMRC (Generalized Maximum Ratio Combining) receiver. The Wireless open-Access Research Platform (WARP) is employed for prototyping and testing these transmitters. The empirical results of a frame transmission reflect the theory and validate the codebooks. However, the hardware-based imperfections and the channel estimation errors affect the performance of the frame. The former errors are originated from a non-ideal time synchronization, Automatic Gain Control (AGC), Analogue to Digital Converters (ADCs) and Digital to Analogue Converters (DACs). The channel estimations are done prior to the frame transmission. However, empirically, the estimated channels are not constant during the frame transmission, and there are fluctuations in their phases and magnitudes. These fluctuations are intensive when there is a line of sight (LOS) path between the antennas. It is shown that codebooks with a low number of feedback bits perform better than those with a large number of feedback bits in this situation. |
| Starting Page | 959 |
| Ending Page | 964 |
| File Size | 402625 |
| Page Count | 6 |
| File Format | |
| ISBN | 9781467347266 |
| e-ISBN | 9781467347280 |
| e-ISBN | 9781467347273 |
| DOI | 10.1109/APCC.2012.6388224 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2012-10-15 |
| Publisher Place | Korea (South) |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Receiving antennas Channel estimation MIMO Transmitting antennas |
| Content Type | Text |
| Resource Type | Article |
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