Error rate performance of dpsk signal in land mobile radio with predetection diversity combiner

Abstract

The symbol rate of an M-ary DPSK signal, caused largely by inherent high irreducible error in the delay detection system, will be discussed for the case of applying the diversity-combining reception under high-speed Rayleigh fading in land mobile radio systems. A s for the predetection combining methods of the Lbranch, which comprise selective combining iso-gain combining and the maximum ratio combining, we will demonstrate anew that both error rates, caused by the envelope fade and random-FM can be represented entirely by L-square of the error rate in case of no diversity combiner. Particularly, our analysis centers on improvement of random-FM. We conclude that the L-square improvement could be applied to the random-FM similar to the envelope fade and, further, the optimum combining system which minimizes the mndom-FM is also maximum ratio combiner. This report will be helpful in doing comparisons among systems, because it shows that the error rates of M-ary DPSK with the diversity reception characteristics could be represented i n a thorough and understandable form. 42ISSN0424-8368/80/000 1-0042$7.50/0 0 1981 Scripta Publishing Co.

An analysis of the effective performance of a handset diversity antenna influenced by head, hand, and shoulder effects—A proposal for a diversity antenna gain based on a signal bit‐error rate and analytical results for the PDC system

“…For instance, an irreducible bit-error rate exists due to Doppler spread, often termed random FM, when a mobile moves at a high speed compared to the data rate [5,9]. At a high-speed data rate, a delay spread due to multiple radio waves may cause an error floor that limits the possible achievable error rate in a large CNR region [10].…”