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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Narasimhamurthy, A.B. Tepedelenlioglu, C. |
| Copyright Year | 1967 |
| Abstract | We study space-time-frequency coded multiple-input-multiple-output (MIMO) orthogonal frequency-division multiplexed (OFDM) systems employing receiver antenna selection (AS), where training has been utilized to perform linear minimum mean square error (LMMSE)-based channel estimation. To minimize the mean square error (MSE) of this estimator, equispaced and equipowered training symbols are used, with the number of training symbols per OFDM symbol equal to the channel length. The maximum received signal power AS rule is proposed, which decouples the AS process from the channel estimation process. By upper bounding the pairwise error probability (PEP) expression, we show that the system with a channel-estimation error (CEE) still achieves maximum spatial and multipath diversity. The performance of the system for the special case of square unitary and orthogonal codes has been analyzed. For the case of orthogonal codes using constant modulus symbols, we also derive the exact bit-error-rate (BER) expression. The degradation in performance, due to the presence of the CEE, is captured by the loss-in-coding-gain (LCG) and loss-in-performance (LP) expressions. To minimize the loss due to the CEE, an optimal power-allocation scheme that distributes the total available power between training symbols and data symbols is defined. Compared with the perfect channel knowledge case, equal power training for the CEE case performs at least 3 dB worse, whereas optimal power training for the CEE case suffers a loss less than 3 dB always. Analytical and simulation results are presented to validate our analysis and results. |
| Sponsorship | IEEE Vehicular Technology Society |
| Starting Page | 2269 |
| Ending Page | 2278 |
| Page Count | 10 |
| File Size | 384106 |
| File Format | |
| ISSN | 00189545 |
| Volume Number | 58 |
| Issue Number | 5 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2009-06-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Channel estimation MIMO OFDM Mean square error methods Frequency division multiplexing Receiving antennas Signal processing Pairwise error probability Performance analysis Bit error rate space–time–frequency (STF) codes Antenna selection (AS) channel-estimation error (CEE) multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) |
| Content Type | Text |
| Resource Type | Article |
| Subject | Applied Mathematics Automotive Engineering Computer Networks and Communications Electrical and Electronic Engineering Aerospace Engineering |
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