Journal Article10.1109/TVT.2012.2186618
Code-Hopping Multiple Access Based on Orthogonal Complementary Codes
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TL;DR: Simulation results show that the complementary-coded CHMA with channel coding can provide much higher capacity than complementary- coded code-division multiple access (CDMA) systems in varying operational scenarios and to deal with destructive collisions among spreading codes in CHMA systems.
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Abstract: Code-hopping multiple access (CHMA) is a newly emerging multiple-access technique with the potential to offer high capacity. Unfortunately, orthogonality among user signals in existing CHMA schemes can be preserved only in synchronous channels under an assumption that neither multipath interference (MI) nor multiple-access interference (MAI) exists. Exploiting their ideal orthogonality, we apply orthogonal complementary codes to CHMA systems to overcome problems with existing CHMA schemes. In particular, we will show that the application of orthogonal complementary codes can significantly improve the performance of a CHMA system due to its unique collision-resistant capability. To deal with destructive collisions among spreading codes in CHMA systems, convolutional coding is employed in complementary-coded CHMA systems. The properties and bit error rate (BER) performance of the proposed system are analyzed for both uplink and downlink applications, where the system may simultaneously suffer MI and MAI. Simulation results show that the complementary-coded CHMA with channel coding can provide much higher capacity than complementary-coded code-division multiple access (CDMA) systems in varying operational scenarios.
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Citations
A Survey on Complementary-Coded MIMO CDMA Wireless Communications
TL;DR: This paper starts with the construction of CCs and then proceeds to describe the design of CC-based CDMA and MIMO wireless communication systems, opening up a new dimension to combine multiple-access and multiple-antenna techniques in a unified platform.
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Error Rate Analysis of SIMO-CDMA with Complementary Codes Under Multipath Fading Channels
D. Judson,Vidhyacharan Bhaskar +1 more
TL;DR: This paper investigates downlink single-input multiple output transmission for complementary coded code-division multiple access (CC-CDMA) systems working in channels with multipath fading.
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Joint Pre-Equalization and Adaptive Combining for CC-CDMA Systems Over Asynchronous Frequency-Selective Fading Channels
TL;DR: Simulation results show the superiority of the proposed scheme in terms of bit error rate (BER) and its adaptability to varying channel states and a joint pre-equalization and adaptive combining scheme.
13
Multiple access interference and multipath interference analysis of orthogonal complementary code-based ultra-wideband systems over multipath channels
TL;DR: Theoretical analysis and simulation results show that the proposed UWB system can achieve excellent performance and outperform the unitary code-based direct-sequence UWBSystem and offset-stacking OS-UWB system.
12
Identical Code Cyclic Shift Multiple Access—A Bridge Between CDMA and NOMA
TL;DR: Simulation results show that the proposed ICCS multiple access (ICCSMA) can achieve a better performance than a traditional DS-CDMA system in a high signal to noise ratio region.
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