Abstract
An ideal coherent maximal ratio (MR) combiner multiplies the signals on all the incoming channels by the complex conjugate of their complex channel gains and then sums the resultant products to provide the optimum combined signal. However, the channel gains can not be estimated perfectly in any practical system. Thus, system performance will be degraded because there will be an error in the estimation of the combiner weighting factors in realistic combiners. In this paper closed form results are obtained for the bit error rates (BER) of MFSK, MPSK (M = 2,4,8) and MDPSK (M = 2,4) using imperfect MR combining in Rayleigh fading. These results are used to approximate the BER performance of equal gain (EG) combining with imperfect co-phasing. The MFSK results are also compared with those of the optimum non-coherent square-law (SL) combiner to determine how good channel estimation must be to surpass the performance of the optimum non-coherent combiner.
| Original language | English |
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| Pages | 363-366 |
| Number of pages | 4 |
| Publication status | Published - May 1995 |
| Externally published | Yes |
| Event | Proceedings of the 1995 IEEE Pacific RIM Conference on Communications, Computers, and Signal Processing - Victoria, BC, Can Duration: 17 May 1995 → 19 May 1995 |
Conference
| Conference | Proceedings of the 1995 IEEE Pacific RIM Conference on Communications, Computers, and Signal Processing |
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| City | Victoria, BC, Can |
| Period | 17/05/95 → 19/05/95 |