Interleaver design for trellis-coded differential 8-PSK modulation with non-coherent detection

The effect of finite interleaver size on bit error rate (BER) performance of coded 8-DPSK is determined by means of computer simulations. The losses evaluated in this way include the SNR degradation due to the timing and frequency errors of the symbol synchronizer and the automatic frequency control (AFC) of the receiver. BER measurements are presented using a conventional 2/3 rate convolutional 8-state trellis-code for typical Rayleigh and Rician fading channels. It is shown that for a Rician channel with a Rician parameter of 7 dB, a Doppler spread of 100 Hz and a data rate of 2400 bps, an interleaver with size 16 x 16 symbols performs nearly as well as a very large interleaver. It is also shown that for very fast Rayleigh channels, the BER-curves flatten out at large SNR

Multidimensional Trellis Coded Phase Modulation Using a Multilevel Concatenation Approach

In this paper, we will use the construction technique proposed in to construct multidimensional trellis coded modulation (TCM) codes for both the additive white Gaussian noise (AWGN) and the fading channels. Analytical performance bounds and simulation results show that these codes perform very well and achieve significant coding gains over uncoded reference modulation systems. In addition, the proposed technique can be used to construct codes which have a performance/decoding complexity advantage over the codes listed in literature

Trellis coding with Continuous Phase Modulation (CPM) for satellite-based land-mobile communications

This volume of the final report summarizes the results of our studies on the satellite-based mobile communications project. It includes: a detailed analysis, design, and simulations of trellis coded, full/partial response CPM signals with/without interleaving over various Rician fading channels; analysis and simulation of computational cutoff rates for coherent, noncoherent, and differential detection of CPM signals; optimization of the complete transmission system; analysis and simulation of power spectrum of the CPM signals; design and development of a class of Doppler frequency shift estimators; design and development of a symbol timing recovery circuit; and breadboard implementation of the transmission system. Studies prove the suitability of the CPM system for mobile communications

Proceedings of the Second International Mobile Satellite Conference (IMSC 1990)

Presented here are the proceedings of the Second International Mobile Satellite Conference (IMSC), held June 17-20, 1990 in Ottawa, Canada. Topics covered include future mobile satellite communications concepts, aeronautical applications, modulation and coding, propagation and experimental systems, mobile terminal equipment, network architecture and control, regulatory and policy considerations, vehicle antennas, and speech compression

KONFIGURASI MIMO MC-CDMA PADA KANAL FADING RAYLEIGH (MIMO MC-CDMA CONFIGURATION IN RAYLEIGH FADING CHANNEL)

ABSTRAKSI: Pada penelitian ini dilakukan perancangan konfigurasi sistem MIMO MC-CDMA yang terdiri atas dua skema yaitu skema-1 dan skema-2, dimana kedua skema berbeda dalam hal koneksi atau hubungan antara lengan (rake) subsistem MC-CDMA dengan lengan subsistem MIMO 2x2 dengan STBC. Sistem MIMO MC-CDMA pada kedua skema dirancang meliputi subsistem baseband processing, subsistem MC-CDMA, dan subsistem MIMO 2x2 dengan STBC encoder beserta estimasi kanal oleh STBC decoder. Simulasi sistem dilakukan dengan software Matlab 7.0 pada kondisi kanal AWGN dan kondisi kanal fading terdistribusi Rayleigh i.i.d, baik flat fading maupun frequency selective, dengan asumsi bahwa kanal memiliki sifat quasi static fading. Koefisien kanal sendiri dibangkitkan dengan metode Jakes. Hasil simulasi menunjukkan bahwa baik pada kanal AWGN maupun fading, sistem MIMO MC-CDMA dengan skema-2 memiliki kecenderungan lebih baik dibandingkan skema-1, dan pada kanal fading jumlah lengan yang memberikan kinerja sistem terbaik diberikan oleh jumlah 2 lengan, dengan kata lain kinerja sistem terbaik diberikan oleh perbandingan antara jumlah subcarrier MC-CDMA dengan jumlah SPR pada subsistem MC-CDMA yang menghasilkan nilai 2, sesuai jumlah antena baik jumlah antena kirim maupun jumlah antena terima.Kata Kunci : Subcarrier, SPR, rake, MC-CDMA, MIMO, STBC, quasiABSTRACT: This report presents implementation of MIMO MC-CDMA system configuration in two scheme, scheme-1 and scheme-2, where both schemes are different at the connection between MC-CDMA rakes and STBC MIMO 2x2 rakes. MIMO MC-CDMA system in both schemes consists of baseband processing subsystem, MC-CDMA subsystem, MIMO 2x2 with STBC encoder subsystem and channel estimation by STBC decoder. System simulation was done by Matlab 7.0 in AWGN channel condition and fading channel condition Rayleigh distributed i.i.d, either in flat fading or frequency selective fading, by assumption that channel has quasi static fading characteristic. Channel coefficient is generated by Jakes method. Simulation results show that MIMO MCCDMA system scheme-2 is better than scheme-1 either in AWGN channel condition or in fading channel condition, and number of rakes that gives best performance of the system is two rakes, in other words best performance of the system is given by two value as the result of number of subcarrier division by number of SPR in MC-CDMA subsystem in fading condition, it matches the number of transmit antennas and receive antennas.Keyword: Subcarrier, SPR, rake, MC-CDMA, MIMO, STBC, quas

Proceedings of the Mobile Satellite Conference

A satellite-based mobile communications system provides voice and data communications to mobile users over a vast geographic area. The technical and service characteristics of mobile satellite systems (MSSs) are presented and form an in-depth view of the current MSS status at the system and subsystem levels. Major emphasis is placed on developments, current and future, in the following critical MSS technology areas: vehicle antennas, networking, modulation and coding, speech compression, channel characterization, space segment technology and MSS experiments. Also, the mobile satellite communications needs of government agencies are addressed, as is the MSS potential to fulfill them

The performance analysis of differential orthogonal space- time block codes

Ph.DDOCTOR OF PHILOSOPH