The paper mainly studies the designs of LA, LS and las codes. Then it makes simulation for theirs auto-correlation functions and cross-correlation functions. Simulation and analysis show that, las code has zero cross-...
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ISBN:
(纸本)9780769536002
The paper mainly studies the designs of LA, LS and las codes. Then it makes simulation for theirs auto-correlation functions and cross-correlation functions. Simulation and analysis show that, las code has zero cross-correlation in the "Zero Interference Window", and has only an impulse auto-correlation in the "Zero Interference Window", and these excellent features help to eliminate ACI. MAI and ISI, thus it increases the system capacity largely. So it has more large potential than traditional codes.
In this paper, firstly, we focus on the construction of las code which is made up of LA code and LS code. Simulations show that las codes have Interference Free Window (IFW). Then simulations for theirs auto-correlati...
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ISBN:
(纸本)9781467344975
In this paper, firstly, we focus on the construction of las code which is made up of LA code and LS code. Simulations show that las codes have Interference Free Window (IFW). Then simulations for theirs auto-correlation functions and cross-correlation functions are performed. lastly, the BER performances of Gold code and las code used by multi-user are simulated. Simulation shows that the BER performance of las code is much better than Gold code's.
In this paper, firstly, we focus on the construction of las code which is made up of LA code and LS code. Simulations show that las codes have Interference Free Window (IFW). Then simulations for theirs auto-correlati...
详细信息
ISBN:
(纸本)9781467344975
In this paper, firstly, we focus on the construction of las code which is made up of LA code and LS code. Simulations show that las codes have Interference Free Window (IFW). Then simulations for theirs auto-correlation functions and cross-correlation functions are performed. lastly, the BER performances of Gold code and las code used by multi-user are simulated. Simulation shows that the BER performance of las code is much better than Gold code’s.
The performance of large area synchronous (las) direct sequence code division multiple access (DS-CDMA) assisted ad hoc networks is investigated in the context of a single-hop infinite mesh of rectilinearly located ad...
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The performance of large area synchronous (las) direct sequence code division multiple access (DS-CDMA) assisted ad hoc networks is investigated in the context of a single-hop infinite mesh of rectilinearly located ad hoc nodes. It is shown that las DS-CDMA exhibits a significantly better performance than the family of traditional spreading sequences used in a quasi-synchronous DS-CDMA scenario having a low number of resolvable multipath components and a sufficiently high number of RAKE receiver branches. The benefits of las codes in ad hoc networks are multifold: (i) Their performance is noise-limited, rather than interference-limited, provided that the multipath and multi-user interference arrives within their interference free window. (ii) Under the same conditions las codes are robust against the 'near-far' effects imposed by ad hoc networks operating without base-station-aided power control, without accurate synchronisation and without implementationally complex interference cancellers.
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