Slow Nakagami Fading Channels Research Articles

Equal-gain combining diversity reception of M-ary cpsk signals in nakagami fading

An expression for the average symbol error rate of M-ary coherent phase-shift-keyed (CPSK) signals for equal-gain combining (EGC) diversity reception in slow Nakagami fading channels is derived using the characteristic function method. The new expression is presented in the form of a one-fold integral. This expression adapts readily for numerical computation of error rates with no restriction on the number of channels or the value of the fading severity index. Numerical results for the error rates are presented for 2- and 4-channel diversity reception of binary, quaternary and octonary CPSK signals.

Evaluation on the Selective Combining for the Detection of M-ary DPSK Signals over Nakagami Fading Channels

The performances of M-ary DPSK(MDPSK) for diversity reception theoretically are derived, using an L-branch selection combining(SC) in frequency-nonselective slow Nakagami fading channels. For integer values of the Nakagami fading parameter m, An exact closed-form symbol error rate(SER) multichannel performance that can be easily evaluated via numerical integration is presented. Finally, we compare these analyses with numerical analyses with integral-form expressions for the performance of MDPSK signals under the effect of two-branch SC diversity over slow and nonselective Rician fading channels with additive white Gaussian noise(AWGN).

Further Analysis Performance on the Generalization of SC for the Reception of M-ary Signals on Wireless Fading Channels

An alternative solution to the problem of obtaining acceptable performances on a fading channel is the diversity technique, which is widely used to combat the fading effects of time-variant channels. The symbol error probability of M-ary DPSK (MDPSK), PSK (MPSK) and QAM (MQAM) systems using 2 branches from the branch with the largest signal-to-noise ratio(SNR) at the output of L-branch selection combining(SC), i.e., SC2 in frequency-nonselective slow Nakagami fading channels with an additive white Gaussian noise(AWGN) is derived theoretically. These performance evaluations allow designers to determine M-ary modulation methods against Nakagami fading channels.

MRC diversity reception of M -ary DPSK signals in slow Nakagami fading channels

The error-rate performance of M-ary DPSK signals received over slow Nakagami fading channels for integer fading index is analysed. A relatively simple expression for computation of the error-rate is presented. This expression is extended to obtain the error-rates of DPSK signals for MRC diversity reception in Nakagami fading. Numerical values for the error-rates are presented.

New analytical expressions for orthogonal, biorthogonal, and transorthogonal signaling in Nakagami fading channels with diversity reception

Analytical probability of error expressions are presented in this paper for orthogonal, biorthogonal, and transorthogonal signaling in slow Nakagami fading channels with diversity reception. These new probability of error expressions are exact, numerically efficient, and general for arbitrary signal dimension. The numerical results obtained will guide system engineers in determining the appropriate dimensionality of the orthogonal, biorthogonal, and transorthogonal signals. They will also be useful for deciding the suitable number of diversity branches used at the receiver to meet the design requirements in wireless fading environments.

Multiple-access interference reduction for QS-CDMA systems with a novel class of polyphase sequences

In this paper, a new class of polyphase sequences for CDMA systems and its generation method are suggested, and the correlation properties of the sequence are investigated. The performance of the sequence in quasi-synchronous CDMA (QS-CDMA) systems is investigated under a frequency-selective, time-nonselective, slow Nakagami fading channel with additive white Gaussian noise (AWGN). It is shown that the performance of the QS-CDMA systems using the suggested sequence is independent of the number of users and is much better than that using the PN sequence.

Bit-error probabilities for 2- and 4-DPSK in general Nakagami fading channels with correlated Gaussian noise

Exact bit-error probability (BEP) expressions are derived for 2- and 4-ary differential phase shift keying (2- and 4-DPSK) with post-detection equal gain combining (EGC) in arbitrarily correlated slow Nakagami fading channels. Unlike previous work, the effect of noise correlation between adjacent symbol intervals is considered and shown explicitly in the BEP expressions. The characteristic function method is used to give a BEP expression in a general form for 2- and 4-DPSK. Furthermore, closed-form BEP expressions are derived for 2-DPSK with coloured noise, and for 4-DPSK with white noise and integer fading parameter m. The theoretical result is demonstrated by analysing two antenna configurations, giving some interesting findings.

The performance of binary transmission in slow Nakagami-fading channels with MRC diversity

This letter presents equations which describe an average weighted spectrum of errors and average block-error probabilities for noncoherent frequency-shift keying (NCFSK) used in D-branch maximal ratio combining (MRC) diversity in independent very slow nonselective Nakagami-fading channels. The average is formed over the instantaneous receiver signal-to-noise ratio (SNR) after combining. The analysis is limited to additive Gaussian noise.