Coded continuous phase modulation based on a feedback–free modulator with noncoherent detection is discussed. Low–complexity receiver processing is achieved by using only two or three linear filters for demodulation and applying noncoherent sequence estimation with reduced–state Viterbi decoding and simple branch metric calculation. Overall, the proposed noncoherent receiver provides significan...

This paper considers noncoherent communication over a frequency-nonselective channel in which the time-varying channel gain is unknown a priori, but is approximately constant over a coherence interval. Unless the coherence interval is large, coherent communication, which requires explicit channel estimation and tracking prior to detection, incurs training overhead which may be excessive, especi...

| In typical bandpass transmission systems, data detection must be performed in the absence of a phase reference. Noncoherent sequence detection represents the optimal solution of this problem, in the sense that it minimizes the probability of erroneously detecting the information sequence. This paper adopts this viewpoint and describes a class of recently-proposed approximate noncoherent seque...

Recently, noncoherent sequence detection schemes for coded linear and continuous phase modulations have been proposed, which deliver hard decisions by means of a Viterbi algorithm. The current trend in digital transmission systems toward iterative decoding algorithms motivates an extension of these schemes. In this paper, we propose two noncoherent soft-output decoding algorithms. The first sol...

This paper considers noncoherent communication over a frequency nonselective channel in which the time-varying channel gain is unknown a priori, but is approximately constant over a coherence interval. Unless the coherence interval is large, coherent communication, which requires explicit channel estimation and tracking prior to detection, incurs training overhead which may be excessive, especi...

| The combination of continuous phase modulation (CPM) with direct-sequence code-division multiple access (DS-CDMA) for multiuser transmission over the additive white Gaussian noise channel is discussed. Concentrating on the important special case of generalized minimum-shift keying, particularly simple receiver structures are obtained. To emphasize on low complexity, noncoherent reception is p...

Tkellis coded modulation with two or multidimensional signal constellations, together with coherent maximumlikelihood detection, is considered an attractive solution for communications over the additive while Gaussian noise (AWGN) channel. In this paper a new noncoherent communication system is introduced called noncoherent coded modulation (NCM) as an alternative to coherent coded modulation. ...

In this paper, we are concerned with the performance of turbo codes on Rayleigh fading channels when noncoherent detection is employed. Performance of turbo codes with noncoherent detection on AWGN channels has been analyzed by Hall and Wilson. They compared the performance of turbo codes with the achievable information theoretic channel capacity for noncoherent detection on AWGN channels. We, ...

In this paper, a novel noncoherent adaptive algorithm for channel estimation is introduced. The proposed noncoherent least–mean–square (NC–LMS) algorithm can be combined easily with noncoherent sequence estimation (NSE) for M–ary differential phase–shift keying (MDPSK) signals transmitted over intersymbol interference (ISI) channels. For zero frequency offset the convergence speed and the stead...